JP2009162507A - Stable state evaluation device, stable state evaluation method, and stable state evaluation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable state evaluation device, a stable state evaluation method, and a stable state evaluation program, capable of evaluating with high accuracy the stable state of a stone material constituting a stone wall, without dismantling the stone wall. <P>SOLUTION: A PC 12 acquires time history information of a translational acceleration in an evaluation object stone material 50, when applying an impact force by an impulse hammer 16 to the evaluation object stone material 50 which is an evaluation object in the stable state of the stone wall, constituted by piling up a plurality of stone materials; acquires time history information of the impact force; detects static rigidity pertaining to translation movement, based on the time history information of the translational acceleration and the time history information of the impact force; evaluates the stable state of the evaluation object stone material 50 based on the detected static rigidity; and displays information showing the evaluation result on a display. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a stable state evaluation device, a stable state evaluation method, and a stable state evaluation program, and more specifically, a stable state evaluation device that evaluates a stable state of each stone in a stone wall formed by stacking a plurality of stones, The present invention relates to a stable state evaluation method and a stable state evaluation program.

  The castle is widely distributed throughout Japan, but considering its value as a cultural property, stone walls are an important factor in addition to buildings such as castle towers and walls. All of these castle stone walls have been built for about 400 years, but since the Meiji period, maintenance has been insufficient, and it is thought that repairs are required at about 150 castle walls.

  However, evaluation and repair technology for castle stone walls, especially empty stone walls, has not been established, and construction is based on the experience of masonry, and establishment of the technology is desired. In the maintenance of the stone wall, in order to identify the stone wall to be repaired, a method for evaluating the soundness of the stone wall is necessary.

  In order to evaluate the soundness of such stone walls, it is important to know what mechanically stable state the stone walls are made up of individual stones. In such a structure in which block-shaped objects are stacked, the contact force between the objects changes depending on the contact state of each object and the mutual positional relationship. It is known that there will be stones that do not work, so to speak. When such a variation in contact force occurs, cracks occur in the stone material where a large contact force acts, or the stone material where the contact force does not act so much is pushed by the pressure of the ground behind, causing protrusion. As a result, the stone wall becomes unstable.

  Conventionally, as a technique that can be applied to evaluate the stable state of such stone materials, Non-Patent Document 1 discloses a technique for calculating the force between stone walls based on the positional relationship of the individual stone materials known from the outside. .

Patent Document 1 discloses a technique for transmitting an electromagnetic wave toward the inside of a stone wall, receiving the reflected electromagnetic wave, and estimating the length of the stone and the back surface of the stone wall based on the received wave. .
Nagase, Hisanori, “On the Masonry Structure of the Asuka Period Kofun Stone Chamber”, 7th Symposium on Using Computers, Architectural Institute of Japan, 1985 JP 2000-352509 A

  However, the technique disclosed in Non-Patent Document 1 is effective in the case of a masonry structure in which the entire stone material targeted by Non-Patent Document 1 can be observed. It was difficult to apply to most unobservable objects, and there was a problem that it was necessary to dismantle the stone wall in order to apply. In addition, since the contact force of the stone material greatly changes due to the delicate projections or depressions of the stone material, the technique disclosed in the Non-Patent Document 1 does not always allow accurate evaluation. There was a problem.

  In addition, in the technique disclosed in Patent Document 1, although the state of the invisible portion of the stone material constituting the stone wall can be evaluated to some extent, even in this technique, subtle protrusions, depressions, etc. However, there is a problem that accurate evaluation cannot always be performed.

  The present invention has been made to solve the above-described problems, and a stable state evaluation apparatus and a stable state evaluation that can accurately evaluate the stable state of a stone material constituting the stone wall without dismantling the stone wall. It is an object to provide a method and a steady state evaluation program.

  Here, the principle of the present invention will be described.

The inventors of the present invention conducted various experiments shown below by measuring the acceleration response when the stone wall was hit.
1. Cutting direct product experiment (hereinafter referred to as “Experiment EA”)
1-1. Purpose Evaluation of the spring constant between the stone and the blue sheet when two stones are stacked.
1-2. Explanation The inventors of the present invention have tried to estimate the spring constant of the stone wall model from the dynamic stiffness of the hit experiment, but the upper stone material responds even when the lower stone material is hit. The influence of the degree of freedom system will come out. For this reason, the rigidity of the lower stone cannot be evaluated correctly. Therefore, as shown in FIG. 15, the stone constant between the stones is hardened with gypsum, and the spring constant is estimated by acting as a simple mass so that the upper stones do not move independently.
1-3. Result Since the upper stone and the lower stone are fixed with gypsum, the upper and lower stones should behave as one body, and the vertical acceleration should be almost equal (the difference will be small because the elastic deformation of the stone itself). However, from FIG. 16 and FIG. 17, the upper stone has a considerably larger acceleration than the lower stone.

  For this reason, it is considered that the main motion is not a translational motion in which the upper and lower stones move in the same way, but a rotational motion around the bottom surface, and the acceleration of angular acceleration calculated based on this is shown in FIG. As expected, it was exactly the same at 60 Hz or less, and it was found that the main motion in this frequency band was rotational motion around the bottom of the stone. Hereinafter, the translational motion is also referred to as “Sway”, and the rotational motion is also referred to as “Rocking”.

  Sway (A) is the same for the top and bottom, and if Rocking (B) is tripled from the position of the acceleration sensor, the lower stone is' A (t) + B (t) 'and the upper stone is' A (t) + 3B (t) ′, and Sway and Rocking (displayed by acceleration at the position of the lower stone) can be separated. Figures 19 and 20 show the calculation based on these assumptions. In addition, these Fourier spectra are shown in FIGS. From these, it can be seen that the dominant frequency of Rocking is around 20 Hz and 50 Hz, and the dominant frequency of Sway is around 130 Hz.

From a series of results, it was found that stone movement must be considered separately from Sway and Rocking.
2. Incision bottom fixed direct product experiment (hereinafter referred to as “Experiment G”)
2-1. Objective With one stone, check whether the vibration caused by striking the stone is the movement of the stone or the deformation of the floor.

Moreover, the state of the movement of the stone when two stones are stacked is examined.
2-2. Explanation In Experiment EA, it was found that the movement of the stone is dominated by the rotational movement around the bottom of the stone (the part in contact with the floor).

  Therefore, in order to ascertain whether this is the effect of the blue sheet or the problem of the deformation of the floor, as shown in FIG. 22, one stone material is tested. Since the stone is completely fixed to the floor with gypsum, it can be considered that the floor is deformed if a rotational movement is detected. The experiment is carried out on the foundation beam so that floor vibration does not occur as much as possible.

After confirming that there is no vibration on the floor, the behavior of the stone by striking when two stones are stacked is examined.
2-3. Results FIG. 23 shows the results of a model of one stone. Unlike the experiment EA, it was confirmed that the dominant frequency was around 700 Hz and not floor vibration. In the dynamic stiffness, the stiffness is different between 2.0 × 10 ⁹ and 6.0 × 10 ⁹ between the top and bottom, which is considered to be due to the shearing or bending deformation of the stone itself.

Next, an experiment is performed using a model in which two stones shown in FIG. 24 are stacked. Since the number of acceleration sensors is insufficient, this model cannot accurately capture the behavior of the underlying stone. Therefore, let us discuss the absolute motion of the stone (2), not the relative motion of the stone (1) and the stone (2). 25 and 26 show the results of hitting the stone (1) in the state of the arrangement 1 shown in FIG. From this result, the rigidity of Sway (the translational motion of the stone (2) including the motion of the stone (1)) is about 10 ¹¹ N / m, and the Rocking (the rotational motion of the stone (2) including the rotation of the stone (1)) It can be seen that the rigidity of is about 10 ⁸ N / radian.

  FIG. 27 shows the observed acceleration and the time history of the Sway and Rocking acceleration of the stone (2) calculated based on the observed acceleration. In the figure, the amount of rotation is the acceleration generated at the center of the stone (2) by rocking, and it can be seen that this is almost the same size when compared with Sway.

FIG. 28 shows the result of hitting the stone (2) with the same arrangement 1. From this result, it can be seen that the rigidity of Rocking is about 10 ⁷ N / radian. The rigidity varies depending on the striking position. When the stone (2) is hit, all the force flows toward the stone (1), whereas when the stone (1) is hit, the stone (2) This is thought to be due to flowing toward the floor at the same time.

Next, FIG. 29 shows the result of hitting the stone (1) with the arrangement 2 shown in FIG. Although the rigidity of Rocking is about 10 ⁸ N / radian, which is slightly smaller than that of FIG. 26, it cannot be said that the rocking rigidity is greatly changed although sand is sandwiched between stones. This is considered to indicate that when the stone (1) is hit, the force flow is mainly directed to the floor. FIG. 30 shows an actual measurement state of the arrangement 2.

Next, the result of hitting the stone (2) with the same arrangement 2 is shown in FIG. Rocking rigidity is about 10 ⁴ to 10 ⁵ N / radian, which is about 10 ² smaller than that of FIG. Also, the frequency band in FIG. 28 is near 100 Hz, whereas in FIG. 31, it is greatly different from around 10 Hz.

  A series of results are summarized in Table 1 below. From this result, it was found that the dynamic rigidity greatly changes when the stone on the failure point (the sand between the stone (1) and the stone (2) in the arrangement 2 in this experiment) is hit.

Examining in more detail the case of the hitting position (1) of the arrangement 2 that cannot be judged by the rigidity, it can be seen that the waveform is considerably different from the case of FIG. 27 as shown in FIG. In FIG. 27, the waveform of the stone (1) is in a shape along the waveform of the stone (2), but is completely different in FIG. In FIG. 27, the upper acceleration is larger than the lower acceleration of the stone (2). However, in FIG. 32, the upper acceleration is smaller and hardly vibrates.

  FIG. 33 shows the acceleration tolerance, and FIG. 34 shows the result of the arrangement 1 for comparison. As shown in FIG. 34, in arrangement 1, the stone (1) and stone (2) have the same dominant frequency, but in FIG. 33, the peak of stone (1) is near the dominant frequency of stone (2). Does not exist. This is because the vibration of the stone (2) is not transmitted to the stone (1) due to the sand between the stones in the arrangement 2, and in the arrangement 2, the stone (1) vibrates at the dominant frequency of the original stone (1). It shows that.

Considering these characteristics, it is considered that the defect can be determined even when the stone under the defect is hit.
3. Concrete block placement experiment (hereinafter referred to as “Experiment H”)
3-1. Objective To investigate whether the rotational motion or translational motion in the stone motion is dominant in the state close to the actual stone wall.
3-2. Explanation Experiment G showed that the movement of direct stone could be explained by translation and rotation. Moreover, it has been found that the above motion can be completely separated and taken out by placing the acceleration sensors side by side above the stone.

  Although direct stone is considered to be susceptible to rotational movement due to its shape, the effect of the rotational movement on actual stone wall vibrations is examined using the models shown in FIGS.

Unlike the previous experiments, six strain gauge type acceleration sensors are used to analyze the behavior of the central stone (3).
3-3. Results FIG. 37 shows the result of the arrangement 1 shown in FIG. 35, and FIG. 38 shows the result of the arrangement 2 shown in FIG. The “relative rotation amount” in the figure represents the acceleration due to the relative rotation at the center of the stone. The rotational motion (stone (3), (1) relative rotation) is approximately half of the translational motion (stone (3), (1) relative) in the case of arrangement 1, and about 1/3 in the case of arrangement 2. It turned out that it cannot be ignored in examining the behavior of stone.

Next, the translational motion and the rotational motion in the arrangement 1 will be examined. From FIG. 39, the rigidity of the translational motion of the stone at the bottom (stone (1) and stone (2)) is about 10 ⁸ N / m, and the rigidity of the center stone (stone (3)) is 10 ⁷ N / m. It turns out that it is a grade. Further, it can be seen from FIG. 40 that the rigidity of the rotational motion of the stone at the bottom is about 10 ⁷ N / radian, and the rigidity of the center stone is about 10 ⁶ N / radian. In either case, there is a dominant frequency near 100 Hz.

Next, FIG. 41 and FIG. 42 show the results of the arrangement 2 (the stone (1) and the stone (2) and the stone (3) sandwiched with sand). The rigidity of the translational movement of the stone at the bottom is about 10 ⁸ N / m, and the rigidity of the center stone (stone (3)) is about 10 ⁵ N / m, which is about 10 ² smaller than that of the arrangement 1. I understand that In addition, the dominant frequency of the central stone is near 50 Hz, which is lower than that of the arrangement 1.

Regarding the rotational movement, the rigidity of the stone at the bottom is about 10 ⁷ N / radian, while the rigidity of the stone at the center is about 10 ⁴ N / radian in the relative movement between the stone (3) and the stone (2). It can be seen that it is about 10 ² smaller than the arrangement 1. Further, the dominant frequency of the central stone is near 20 Hz in the relative motion between the stone (3) and the stone (2), and is lower than the arrangement 1. In the relative motion between the stone (3) and the stone (1), no clear flat portion was observed in the dynamic stiffness graph near 20 Hz, and it was about 10 ⁵ N / radian near 100 Hz.

  From the above results, it was confirmed that the identification of the defect location was qualitatively possible due to the dynamic rigidity.

  On the other hand, the inventors of the present invention aim to establish a quantitative evaluation method of the contact state between stones in stone walls, and the dynamic behavior of stones due to inclusions between stones (spring constant, damping constant, acceleration spectrum, etc. ) To evaluate the presence or absence of inclusions and voids.

  The stone wall at the time of construction is in direct contact with the stone, and the stability of the entire stone wall structure is established in anticipation of the slip resistance of the back soil and the friction / engagement of the stone contact surface. When gaps and foreign matter enter and intervene due to secular change, the transmission of force due to friction and meshing of the contact surface changes to that affected by the deformation characteristics of the inclusions. This change was measured as a change in the relative displacement characteristics between stones due to the sliding of the stone contact surface or the shear deformation of inclusions, and a relative displacement characteristic value map of the entire stone wall structure was created. In addition to discriminating, the stability during an earthquake is evaluated by numerical prediction.

  Impulse response vibration experiments were performed using three types of stone wall structural models (FIGS. 43, 49, and 51). Here, the horizontally adjacent stones were in a non-contact state. A stone was hit with a hammer in a direction orthogonal to the paper surface, and an acceleration sensor was installed on the hit stone and the lower stone in contact therewith.

  In addition, although the experiment shown below partially overlaps with the various experiments described above, for the convenience of explanation, the drawings to be referred to are shown in a state partially overlapping with the drawings corresponding to the experiments described above.

  Table 2 shows the specifications of stone materials applied in each experiment (Experiment G, Experiment H, Experiment J4). The stone used in Experiment G is andesite, and the stone used in Experiment H and Experiment J4 is a mortar block.

In Experiment G (FIG. 43), arrangement 1 brought stones into direct contact, and arrangement 2 placed sand-filled bags between the stones. The stone (1) (lower side) was fixed to the RC floor with gypsum. FIG. 45 is a time history waveform of the load cell measurement value (up to 177 N) of the hammer when the stone (2) is hit in the arrangement 2.

  FIG. 46 shows the relative acceleration waveform of the translational motion of the stone (2) with respect to the stone (1) calculated by considering the motion of the stone as a translational motion between stones shown in FIG. 44 and a rotational motion of the stone bottom. Arrangement 1 is close to the behavior of a rigid-plastic friction model, and Arrangement 2 is close to the elastic behavior of sand, bags, and stone surfaces.

FIG. 47 shows the dynamic shear spring constant of the stone contact surface obtained by dividing the hammering force by the relative displacement. The value of the flat part is considered as a static spring constant. The spring constant of Arrangement 1 is about 1.0 × 10 ⁸ N / m, and the spring constant of Arrangement 2 is about 1.0 × 10 ⁶ N / m. The spring constant is large with and without inclusions. I can see that they are different.

Based on the spring constant obtained in this way, the time history of the uppermost acceleration sensor in the arrangement 1 is shown in FIG. The shear spring constant after tuning is 7.5 × 10 ⁷ N / m, which is close to 1.0 × 10 ⁸ N / m predicted from the dynamic shear spring constant, and the analysis and the experiment are consistent. It was confirmed.

  Experiment H (FIG. 49) is an impulse response vibration experiment in which four mortar blocks are piled up. The experimental method is the same as Experiment G. The stone (3) was hit in the direction orthogonal to the paper surface, and the shear spring constant between the stone (1) and the stone (2) was determined. As for the contact surfaces of the stone (3), the stone (2), and the stone (1), the arrangement 1 is a direct contact, and the arrangement 2 is a contact with a sand stuffing bag interposed.

FIG. 50 shows the measurement result of the dynamic shear spring constant. The measured values of the dynamic shear spring constants of the stone (3) / (1) and the stone (3) / (2) are written together, but they are almost equal. Similarly, when the shear spring constant is read, the arrangement 1 is about 1.0 × 10 ⁷ N / m (20 to 150 Hz), and the arrangement 2 is about 1.0 × 10 ⁵ N / m (10 to 40 Hz). The magnitude relationship between Arrangement 1 and Arrangement 2 of the shear spring constant is similar to Experiment G.

Next, in order to eliminate the influence of the vicinity of the oblique staircase due to the convenience of the stacking and measure the vibration characteristics close to the actual stone wall, a five-step stacking experiment J4 (FIG. 51) was performed. The stone material is a mortar block. FIG. 52 shows a measurement of the dynamic shear spring constant with the stone (30) when the stone (21) in the figure is hit and the number of identifications with the stone (24) by hitting the stone (24). is there. A packing material (four bubble sheets) is interposed between the stone material (21) and the stone material (30), and the stone material (24) and the stone material (32) are in direct contact. From the same figure, when the shear spring constant is read in the same manner as in Experiment G and Experiment H, the distance between the stone (21) and the stone (30) is 1.0 × 10 ⁶ N / m (10 to 70 Hz), the stone ( 24) and the stone (32) are about 1.0 × 10 ⁸ N / m (50 to 100 Hz), and the magnitude relationship between the experiments G and H and the spring constant is similar.

  As described above, an impulse response experiment was performed in order to determine the presence or absence of inter-stone inclusions in the stone wall structure, mainly in the masonry masonry. The dynamic characteristics were obtained from the relative acceleration between stone materials, and the measurement results of the dynamic shear spring constant among the characteristic values were shown. From the comparison of the characteristic values, it was possible to evaluate the presence or absence of inclusions, and it was found that the calculated spring constant was consistent with the numerical analysis.

  Based on the above principle, the stable state evaluation apparatus according to claim 1 is configured to apply a striking force to an evaluation target stone to be evaluated for a stable state of a stone wall formed by stacking a plurality of stones. Acquiring at least one of translation history time history information and rotational acceleration time history information in the evaluation target stone, and acquiring the striking force time history information, and acquiring the translation acceleration time history information by the acquisition means Is acquired, the static stiffness related to the translational motion is detected based on the time history information of the translation acceleration and the time history information of the impact force, and the time history information of the rotational acceleration is acquired by the acquisition means. The detection means for detecting the static stiffness related to the rotational motion based on the time history information of the rotational acceleration and the time history information of the impact force, and the detection means It comprises an evaluation means for evaluating the stable state of the evaluation object stone based on the issued static stiffness, and a display means for displaying information indicating the evaluation result by the evaluation means.

  According to the stable state evaluation apparatus according to claim 1, the acquisition unit applies a striking force to the evaluation target stone as the evaluation target of the stable state of the stone wall formed by stacking a plurality of stones. At least one of the translation history time history information and the rotational acceleration time history information in the evaluation target stone is acquired, and the striking force time history information is acquired. The above stone materials include stone materials and concrete blocks defined in JIS A5003 such as granite and andesite.

  Here, in the present invention, when the time history information of the translation acceleration is acquired by the acquisition unit by the detection unit, the translation history is related to the time history information of the translation acceleration and the time history information of the hitting force. When static rigidity is detected and the time history information of the rotational acceleration is acquired by the acquisition means, the static rigidity related to the rotational motion is determined based on the time history information of the rotational acceleration and the time history information of the striking force. Detected.

  In the present invention, the evaluation means evaluates the stable state of the evaluation target stone based on the static stiffness detected by the detection means, and displays information indicating the evaluation result on the display means. In addition, in the display by the display means, in addition to visible display by various display devices such as a liquid crystal display device, a plasma display device, an organic EL display device, and a CRT display device, permanent visible display by an image forming apparatus such as a printer device, An audible display by a voice output device such as a voice synthesizer is included.

  That is, in the present invention, based on the principle described above, static stiffness is detected based on at least one of translation history time history information and rotational acceleration time history information, and the evaluation target stone is stabilized based on the static stiffness. The state is evaluated, and as a result, the stable state of the stone material constituting the stone wall can be evaluated with high accuracy without dismantling the stone wall.

  Thus, according to the stable state evaluation apparatus according to claim 1, when the striking force is given to the evaluation target stone as the evaluation target of the stable state of the stone wall configured by stacking a plurality of stones, While acquiring at least one of the time history information of translational acceleration and the time history information of rotational acceleration in the stone to be evaluated, when acquiring the time history information of the striking force, and when acquiring the time history information of the translational acceleration, When the static stiffness regarding the translational motion is detected based on the time history information of the translation acceleration and the time history information of the impact force, and the time history information of the rotation acceleration is acquired, the time history information of the rotation acceleration and the hit Based on the time history information of the force, the static stiffness related to the rotational motion is detected, the stable state of the evaluation target stone is evaluated based on the detected static stiffness, and information indicating the evaluation result is displayed. Since the display by stage, without disassembling the stone, it is possible to evaluate the stability condition of the stone that constitutes the stone with high accuracy.

  In the present invention, as in the invention described in claim 2, the detection means derives a spectrum of the impact force based on the time history information of the impact force, and the translation means determines the translational acceleration. When the time history information is acquired, a translation acceleration spectrum is derived based on the translation acceleration time history information. When the rotation acceleration time history information is acquired by the acquisition means, Deriving means for deriving a rotational acceleration spectrum based on time history information, and when the translation history time history information is acquired by the acquiring means, dividing the translation acceleration spectrum by the striking force spectrum. To calculate the acceleration related to the translational motion, and when the time history information of the rotational acceleration is acquired by the acquiring means, the rotational acceleration is calculated. An acceleration calculation means for calculating an acceleration related to a rotational motion by dividing a spectrum of degrees by a spectrum of the impact force, and when the time history information of the translational acceleration is acquired by the acquisition means, The dynamic stiffness related to the translational motion is calculated by dividing the spectrum by the displacement spectrum of the translational motion obtained by integrating the spectrum of the translational acceleration twice, and the time history information of the rotational acceleration is obtained by the acquisition means. Is obtained by dividing the impact force spectrum by the displacement spectrum of the rotational motion obtained by integrating the rotational acceleration spectrum twice. Mechanical stiffness calculation means, and the acquisition means obtains the time history information of the translational acceleration. If obtained, the rigidity of the change per predetermined frequency in the vicinity of the prevailing frequency in the acceleration related to the translational motion from the dynamic stiffness related to the translational motion is set to a static value related to the translational motion. When the rotational acceleration time history information is acquired by the acquisition means, the change per predetermined frequency from the dynamic rigidity related to the rotational motion to the dominant frequency in the acceleration related to the rotational motion. Rigidity whose amount is within a predetermined range may be detected as static rigidity related to the rotational motion. Thereby, the stable state of the stone material which comprises a stone wall more simply and with high precision can be evaluated.

  In particular, in the invention described in claim 2, as in the invention described in claim 3, the evaluation means fixes the stone to be evaluated whose static rigidity is smaller than a predetermined level compared to other stones to be evaluated. It is good also as what evaluates the stable state of the said evaluation object stone material by evaluating that it is low and it is unstable. Thereby, the stable state of the stone material which comprises a stone wall can be evaluated more simply.

  In the invention according to claim 2 or claim 3, when the time history information of the translational acceleration is acquired by the acquisition unit for all the evaluation target stones, as in the invention according to claim 4. The time history information of the translation acceleration is integrated twice or the displacement time history is calculated by inverse Fourier transform of the displacement spectrum of the translation motion, and the attenuation constant is calculated based on the displacement time history, When the time history information of the rotational acceleration is acquired by the acquiring means, the time history information of the rotational acceleration is integrated twice, or the displacement time history is obtained by inverse Fourier transform of the displacement spectrum of the rotational motion. Attenuation constant calculating means for calculating and calculating an attenuation constant based on the displacement time history, wherein the evaluation means calculates all the evaluations calculated by the attenuation constant calculating means. By performing mass system analysis based on the static stiffness and the damping constant of the target stone may be used to evaluate the overall steady state of the evaluation object stone. Thereby, the stable state of the stone material which comprises a stone wall with higher precision can be evaluated.

  In particular, the invention according to claim 4 is the time history information and rotation of the corresponding translation acceleration acquired by the acquisition means, the damping constant and the static stiffness, as in the invention according to claim 5. You may further provide the adjustment means adjusted by the reverse analysis using at least one of the time history information of an acceleration. Thereby, the stable state of the stone material which comprises a stone wall with higher precision can be evaluated.

  In the invention according to claim 5, the adjusting means may perform the inverse analysis using a genetic algorithm. Thereby, the stable state of the stone material which comprises a stone wall more simply and with high precision can be evaluated.

  Further, according to the present invention, as in the invention described in claim 6, when the acquisition unit acquires time history information of the translational acceleration, the vicinity of the lower end portion of the evaluation target stone and the evaluation target stone An acceleration sensor is provided near the upper end of the stone adjacent to the lower part, and when acquiring time history information of the rotational acceleration, an acceleration sensor is provided near the upper end and the lower end of the evaluation target stone. The acceleration detected by the acceleration sensor provided in the vicinity of the upper end portion of the evaluation target stone is defined as acceleration AC1, and the acceleration detected by the acceleration sensor provided in the vicinity of the lower end portion of the evaluation target stone is defined as acceleration AC2. The acceleration detected by the acceleration sensor provided near the upper end of the stone adjacent to the lower part of the evaluation target stone is defined as acceleration AC3, and the upper end of the evaluation target stone Assuming that the distance between the acceleration sensor provided in the vicinity and the acceleration sensor provided in the vicinity of the lower end is D, the translation acceleration HAC and the rotation acceleration KAC are calculated by calculating using the following arithmetic expressions. Also good.

As a result, the time history information of the translation acceleration and the time history information of the rotation acceleration can be acquired more easily, and as a result, the stable state of the stone material constituting the stone wall can be evaluated more easily.

  On the other hand, in order to achieve the above object, the stable state evaluation method according to claim 7 gives a striking force to an evaluation target stone that is an evaluation target of a stable state of a stone wall formed by stacking a plurality of stones. Acquiring at least one of the time history information of the translational acceleration and the time history information of the rotational acceleration in the evaluation target stone at the time, and acquiring the time history information of the striking force, and the translation acceleration by the acquisition step If the time history information is acquired, static stiffness related to translational motion is detected based on the time history information of the translational acceleration and the time history information of the impact force, and the time history information of the rotational acceleration is obtained by the acquisition step. Is acquired, the detection step of detecting static rigidity related to the rotational motion based on the time history information of the rotational acceleration and the time history information of the impact force, and the detection An evaluation step of evaluating the steady state of the evaluation object stone based on the static rigidity detected by degree, those having a display step of displaying by the display means the information indicating the evaluation result by the evaluation step.

  Therefore, according to the stable state evaluation method described in claim 7, since it operates in the same manner as the invention described in claim 1, the stone wall is configured without dismantling the stone wall as in the invention described in claim 1. The stable state of stone can be evaluated with high accuracy.

  On the other hand, in order to achieve the above object, the stable state evaluation program according to claim 8 gives a striking force to the evaluation target stone as an evaluation target of the stable state of the stone wall formed by stacking a plurality of stones. Acquiring at least one of the time history information of the translational acceleration and the time history information of the rotational acceleration in the evaluation target stone at the time, and acquiring the time history information of the striking force, and the translation acceleration by the acquiring step Is acquired, the static stiffness related to the translational motion is detected based on the time history information of the translation acceleration and the time history information of the impact force, and the time history information of the rotational acceleration is acquired by the acquisition step. Is acquired, the static stiffness related to the rotational motion is detected based on the time history information of the rotational acceleration and the time history information of the striking force. An evaluation step for evaluating a stable state of the evaluation target stone based on the static stiffness detected by the detection step, and a display step for displaying information indicating an evaluation result by the evaluation step by a display means. It is what is executed by a computer.

  Therefore, according to the stable state evaluation program of the eighth aspect, the computer can be operated in the same manner as the first aspect of the invention, so that the stone wall is disassembled in the same manner as the first aspect of the invention. In addition, the stable state of the stone material constituting the stone wall can be evaluated with high accuracy.

  According to the present invention, the time history information of the translational acceleration in the evaluation target stone when the striking force is given to the evaluation target stone which is the evaluation target of the stable state of the stone wall formed by stacking a plurality of stones, and When acquiring at least one of the rotational acceleration time history information, acquiring the impact history time history information, and acquiring the translation acceleration time history information, the translation acceleration time history information and the impact force When static rigidity related to translational motion is detected based on the time history information and the time history information about the rotational acceleration is acquired, the time history information about the rotational acceleration and the time history information about the hitting force are related to the rotational motion. Since the static rigidity is detected, the stable state of the evaluation target stone is evaluated based on the detected static rigidity, and information indicating the evaluation result is displayed by the display means. Without the body, it is possible to assess the stable state of the stone that constitutes the stone with high accuracy, the effect is obtained that.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
First, the configuration of a stable state evaluation system 10 to which the present invention is applied will be described with reference to FIG.

  As shown in the figure, a stable state evaluation system 10 according to the present embodiment includes a personal computer (hereinafter referred to as “PC”) 12 that plays a central role in the system 10, an acceleration sensor 14, An impulse hammer 16, an amplifier 18, a data recorder 20, and a recording / output device 22 are provided.

  An output terminal that outputs acceleration information indicating the measurement result of acceleration of the acceleration sensor 14 and an output terminal that outputs striking force information indicating the striking force by the impulse hammer 16 are both connected to the input terminal of the amplifier 18. The output terminal of the amplifier 18 is connected to the input section of the data recorder 20. Accordingly, the acceleration information and the striking force information are amplified to a predetermined level range by the amplifier 18 and then recorded by the data recorder 20.

  On the other hand, the output unit of the data recorder 20 is connected to the input unit of the PC 12, while the output unit of the PC 12 is connected to the input unit of the recording / output device 22. Accordingly, the PC 12 can obtain the acceleration information and the striking force information recorded in the data recorder 20 while reading various information based on the acceleration information and the striking force information by the recording / output device 22. And can be output. In the stable state evaluation system 10 according to the present embodiment, the recording / output device 22 is a hard disk device for recording the various types of information, and a printer for outputting the various types of information. Needless to say, the device is not limited to this device as long as it can record or output various information.

  Next, with reference to FIG. 2, the configuration of the main part of the electrical system of the PC 12 having a particularly important role in this system will be described.

  As shown in the figure, the PC 12 according to the present embodiment includes a CPU (central processing unit) 12A that controls the operation of the entire PC 12, a RAM 12B that is used as a work area when the CPU 12A executes various processing programs, and the like. ROM 12C in which a control program, various parameters, and the like are stored in advance, a secondary storage unit (here, a hard disk device) 12D used for storing various information, a keyboard 12E used for inputting various information, A display 12F used for displaying various types of information and an input / output I / F (interface) 12G that controls transmission and reception of various signals between external devices and the like are provided. These units are connected by a system bus BUS. They are electrically connected to each other.

  Therefore, the CPU 12A accesses the RAM 12B, ROM 12C, and secondary storage unit 12D, acquires various input information via the keyboard 12E, displays various information on the display 12F, and an external device via the input / output I / F 12G. Various kinds of information can be exchanged between the two. The data recorder 20 and the recording / output device 22 described above are electrically connected to the input / output I / F 12G.

  On the other hand, FIG. 3 schematically shows main storage contents of the secondary storage unit 12D provided in the PC 12. As shown in the figure, the secondary storage unit 12D is provided with a database area DB for storing various databases and a program area PG for storing programs for performing various processes. .

  The database area DB includes a stone wall information database DB1 and a measurement information database DB2.

  As shown schematically in FIG. 4 as an example, the stone wall information database DB1 according to the present embodiment includes each stone material number and position information for each stone material constituting the stone wall to be evaluated by the stable state evaluation system 10. It is comprised so that it may be memorize | stored.

  The stone number information is information given in advance as different to each stone in order to identify each stone included in the stone wall to be evaluated.

  On the other hand, in the stable state evaluation system 10 according to the present embodiment, as schematically shown in FIG. 5 as an example, the position of each stone material included in the stone wall to be evaluated is set to a predetermined reference position (same as above). In the example shown in the figure, the position of the stone located at the upper left corner point) is expressed by an XY coordinate system with the origin coordinates (1, 1). For example, the position of the stone adjacent to the right of the stone located at the reference position is (2, 1), and the position of the stone adjacent below the stone located at the reference position is (1, 2). .

  The position information in the stone wall information database DB1 is information indicating the position of the corresponding stone material in the XY coordinate system, and is referred to as an evaluation object as shown in FIG. 5 as an example by referring to the database. An image showing a stone wall can be schematically reproduced.

  On the other hand, in the measurement information database DB2 according to the present embodiment, as schematically shown in FIG. 6 as an example, each information of stone number, impact force time history, and acceleration time history is stored for each stone. It is comprised so that.

  The stone material number information is the same as that of the stone wall information database DB1, and the hitting force time history information is output from the impulse hammer 16 and stored in the data recorder 20 via the amplifier 18. The acceleration time history information is output from the acceleration sensor 14 when the corresponding stone is struck with a corresponding striking force by the impulse hammer 16 and is sent to the data recorder 20 via the amplifier 18. Information indicating the recorded acceleration response.

  By the way, in the stable state evaluation system 10 which concerns on this Embodiment, as shown in FIG. 44 as an example, the motion of each stone material which comprises a stone wall is the translational motion in the interface between the stone materials between stone materials, and In the stone wall (not shown) of a plurality of stones that are formed by stacking a plurality of stones as shown in FIG. Acceleration time history information indicating an acceleration response when the striking force is applied by the impulse hammer 16 to the evaluation target stone 50 to be evaluated in the stable state is acquired via the acceleration sensor 14, and the acquired acceleration time history information is acquired. The static stiffness of the evaluation target stone material 50 is detected based on the acceleration response indicated by, and the stable state of the evaluation target stone material 50 is evaluated based on the static stiffness. .

  Here, in the stable state evaluation system 10 according to the present embodiment, translation acceleration time history information is adopted as the acceleration time history information, and as shown in FIG. Provided in the vicinity of the lower end portion of the evaluation target stone 50 and the upper end portion of the stone adjacent to the lower portion of the evaluation target stone 50, the impulse hammer 16 applied a striking force to the substantially central portion of the evaluation target stone 50 in front view. Acceleration time history information is acquired by each acceleration sensor 14 and recorded in the measurement information database DB2. Here, when the evaluation target stone 50 is located at the lower end of the stone wall to be evaluated, there is no stone at the lower part of the evaluation target stone 50, but in this case, only in the vicinity of the lower end of the evaluation target stone 50. An acceleration sensor 14 is provided.

  In FIG. 24, the position of the acceleration sensor with respect to the stone adjacent to the lower part of the evaluation target stone is the central portion in the vertical direction of the stone, but the translational acceleration is the acceleration at the lower end of the evaluation target stone. And the difference in acceleration of the upper end of the stone adjacent to the lower part of the evaluation target stone, it is preferable to be as close as possible to the upper end of the stone adjacent to the lower part of the evaluation target stone. This form is applied. In addition to this form, for example, an acceleration sensor is provided at two different points in the vertical direction of the stone adjacent to the lower part of the evaluation target stone, and the interpolation at the upper end is performed using the measurement values obtained by the two acceleration sensors. It is also possible to calculate acceleration. Similarly, for the stone to be evaluated, acceleration sensors may be provided at two points in different vertical directions, and the acceleration at the lower end may be calculated by interpolation using the measurement values of the two points of the acceleration sensor. it can.

  Next, the operation of the stable state evaluation system 10 according to the present embodiment will be described.

  First, the operation of the stable state evaluation system 10 when acquiring acceleration time history information in a plurality of evaluation target stones 50 will be described.

  At this time, as described above, the worker provides the acceleration sensor 14 in the vicinity of the lower end of any one of the plurality of evaluation target stones 50, while there is a stone adjacent to the lower part of the evaluation target stone 50. In that case, the acceleration sensor 14 is provided near the upper end of the stone. Then, the worker gives a striking force to the substantially central portion of the evaluation target stone 50 in front view by the impulse hammer 16.

  In response to the application of the striking force, acceleration information indicating the measurement result of acceleration is output from the acceleration sensor 14, while striking force information indicating the striking force is output from the impulse hammer 16.

  The acceleration information and the striking force information are amplified to a predetermined level range by the amplifier 18 and then recorded by the data recorder 20. At this time, the acceleration information is output from the acceleration sensor 14 in real time in time series immediately after the impact force is applied by the impulse hammer 16, and is recorded in the data recorder 20 as acceleration time history information. . Further, the striking force information is output from the impulse hammer 16 sequentially in real time in chronological order immediately after the striking force is applied to the evaluation target stone 50, and this is output to the data recorder 20 as striking force time history information. Record.

  At this time, the worker performs the impact on the evaluation target stone 50 with the impulse hammer 16 in the order determined in advance. Thereby, since the striking force time history information and the acceleration time history information are recorded in the data recorder 20 in the predetermined order, the PC 12 corresponds to the stone number corresponding to the order recorded in the data recorder 20. The striking force time history information and the acceleration time history information are registered in the measurement information database DB2 in a state associated with. In addition, when the evaluation target stone 50 is located at the lower end of the stone wall to be evaluated, the acceleration time history information in the vicinity of the upper end of the stone adjacent to the lower part of the evaluation target stone 50 indicates that there is no acceleration. 0 (zero) is registered in the measurement information database DB2.

  By the above process, the measurement information database DB2 shown in FIG. 6 is constructed as an example.

  Next, referring to FIG. 7, the operation of the stable state evaluation system 10 according to the present embodiment when evaluating the stable state of the evaluation target stone 50 using the measurement information database DB2 constructed by the above procedure. explain. 7 shows a stable state that is executed by the CPU 12A of the PC 12 when an instruction to execute the evaluation of the stable state is input by the user via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of an evaluation process program, and the said program is previously memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case where the stone wall information database DB1 and the measurement information database DB2 are constructed in advance to avoid complications will be described.

  In step 100 in the figure, the striking force time history information and the acceleration time history information corresponding to any one of the evaluation target stones 50 are read from the measurement information database DB2, and in the next step 102, the following equation (1) is used. Time history information of translational acceleration is calculated. In equation (1), AC2 represents the acceleration measured by the acceleration sensor provided near the lower end of the evaluation target stone 50, and AC3 is provided near the upper end of the stone adjacent to the lower part of the evaluation target stone 50. The acceleration measured by the obtained acceleration sensor is represented, HAC represents the translational acceleration, and the time history information of the translational acceleration is calculated by substituting the acceleration AC2 and the acceleration AC3 corresponding to the same time into the equation (1).

In the next step 104, the striking force spectrum is derived by Fourier transforming the striking force time history information read out in the processing of step 100, and the time history of translational acceleration calculated by the processing in step 102 is calculated. The spectrum of translational acceleration is derived by Fourier transforming the information.

  In the next step 106, the translational acceleration spectrum derived by the processing in step 104 is divided by the striking force spectrum to calculate the acceleration related to the translational motion. In the next step 108, the striking force spectrum is calculated. Then, the dynamic stiffness related to the translational motion is calculated by dividing by the translational motion displacement spectrum obtained by integrating the spectrum of the translational acceleration twice, and stored in a predetermined area of the secondary storage unit 12D.

  In the next step 110, the change per predetermined frequency in the vicinity of the dominant frequency in the acceleration relating to the translational motion calculated by the processing of step 106 from the dynamic stiffness related to the translational motion calculated by the processing of step 108 above. Rigidity whose amount is within a predetermined range is detected as static rigidity.

  That is, the excitation force f (t) of the hammer and the equation of motion of the stone are expressed as follows: Here, m represents the mass of the stone, c represents the damping constant, and k represents the spring constant (static stiffness). Further, a (t) represents the acceleration of the stone, v (t) represents the speed of the stone, and d (t) represents the displacement of the stone.

When this is Fourier transformed to obtain the excitation force spectrum, the following equation is obtained. Here, F (ω) represents the excitation force spectrum, A (ω) represents the acceleration spectrum of the stone, V (ω) represents the velocity spectrum of the stone, and D (ω) represents the displacement spectrum of the stone. .

By dividing this by the displacement spectrum D (ω) and obtaining the dynamic stiffness, the following equation is obtained.

By the way, the velocity spectrum V (ω) and the acceleration spectrum A (ω) are expressed by the following equations.

Therefore, by substituting this equation, the dynamic stiffness is expressed by the following equation.

The mass m, the damping constant c, the spring constant k, and the magnitude of ω determine which part of the first to third terms becomes dominant at a specific ω. The first term is the second-order term of ω, the second term is the first-order term of ω, and the third term is a constant, so it is a constant in the dynamic stiffness (in the graph, The flat part is the spring constant k, that is, the static rigidity.

  In the stable state evaluation processing program according to the present embodiment, if the change amount is included in the predetermined range used in the processing of step 110, it is determined that the stiffness is static. Although the range previously obtained by experiment etc. is applied as the range which can be performed, it is not restricted to this.

  In the next step 112, the time history information of the translation acceleration is integrated twice or the displacement time history is calculated by inverse Fourier transform of the displacement spectrum of the translation motion, and an attenuation constant is calculated based on the displacement time history. Is calculated and stored in a predetermined area of the secondary storage unit 12D.

  In the stable state evaluation processing program according to the present embodiment, as shown in FIG. 8 as an example, the first peak value of the displacement time history is d1, the second peak value is d2, and the first peak value is d2. The attenuation constant h is calculated by substituting the peak value d1 and the second peak value d2 into the following equation (2).

In the stable state evaluation processing program according to the present embodiment, the displacement time history is calculated by performing Fourier inverse transform on the displacement spectrum of the translational motion.

  In the next step 114, it is determined whether or not the processing of step 100 to step 112 has been completed for all the evaluation target stones 50. If the determination is negative, the process returns to step 100, but the determination is affirmative. At this point, the process proceeds to step 116. In addition, when repeatedly performing the process of the said step 100-step 114, it is made to make the evaluation object stone 50 which was not made into a process target so far become a process target.

  In step 116, the static rigidity of all the evaluation target stones 50 stored by the processing of step 110 is read, and the stable state of the evaluation target stone 50 is determined (evaluated) based on the static rigidity. In the stable state evaluation processing program according to the present embodiment, the processing of step 116 is performed by using the evaluation target stone 50 whose static stiffness is lower than a predetermined level compared to the other evaluation target stone 50 with a low degree of fixation. This is done by identifying the stone as being unstable.

  In the present embodiment, a value of a predetermined ratio (as an example, 50%) of the maximum static stiffness value of each evaluation target stone 50 is applied as the predetermined level. The predetermined level may be set as appropriate according to the use of the system 10 and the required accuracy. In addition, the determination process performed in step 116 is not limited to such a relative determination process by comparison with the other evaluation target stone 50, and for example, the static stiffness in a stable stone is a reference value. As described above, the stability of the evaluation target stone 50 based on the calculated static rigidity, such as a form in which the evaluation target stone 50 having a static rigidity smaller than the reference value by a predetermined value or more is identified as a defective stone. Any form can be applied as long as the state is evaluated.

  In the next step 118, based on the determination result of the stable state of the evaluation target stone 50 obtained by the processing in step 116, information indicating a result screen showing the evaluation result in a predetermined format is configured. In the next step 120, the result screen is displayed on the display 12F based on the configured information, and then the stable state evaluation processing program is terminated.

  FIG. 9 shows an example of the display state of the result screen displayed on the display 12F by the process of step 120 of the stable state evaluation processing program. As shown in the figure, in the stable state evaluation processing program according to the present embodiment, stones that have been determined to have a low degree of fixation by the processing in step 116 are displayed. Therefore, the user of the stable state evaluation system 10 can easily grasp the stone material to be prioritized when taking countermeasures by referring to the result screen.

  As described above in detail, in the present embodiment, the evaluation target stone when the striking force is applied to the evaluation target stone that is the evaluation target of the stable state of the stone wall formed by stacking a plurality of stones. In addition to acquiring the time history information of the translational acceleration in the time, to acquire the time history information of the impact force, to detect the static stiffness related to the translational motion based on the time history information of the translational acceleration and the time history information of the impact force, Since the stability state of the evaluation target stone is evaluated based on the detected static rigidity and information indicating the evaluation result is displayed, the stability state of the stone constituting the stone wall is increased without dismantling the stone wall. The accuracy can be evaluated.

  In the present embodiment, a spectrum of the hitting force is derived based on the time history information of the hitting force, and a spectrum of translational acceleration is derived based on the time history information of the translational acceleration. The acceleration for translational motion is calculated by dividing the spectrum by the spectrum of the impact force, and the spectrum of the impact force is divided by the displacement spectrum of the translational motion obtained by integrating the spectrum of the translational acceleration twice. Thus, the dynamic stiffness related to the translational motion is calculated, and the change amount per predetermined frequency in the vicinity of the dominant frequency in the acceleration related to the translational motion from the dynamic stiffness related to the translational motion is within a predetermined range. Since the stiffness is detected as the static stiffness related to the translational motion, the stone wall can be constructed more easily and with high accuracy. A stable state of stone that can be evaluated.

  In particular, in the present embodiment, the evaluation target stone is evaluated by evaluating that the static rigidity of the evaluation target stone is lower than that of the other evaluation target stone, and the degree of fixation is low and unstable. Therefore, it is possible to evaluate the stable state of the stone constituting the stone wall more easily.

  Furthermore, in the present embodiment, acceleration sensors are provided in the vicinity of the lower end portion of the evaluation target stone and in the vicinity of the upper end portion of the stone adjacent to the lower portion of the evaluation target stone, and in the vicinity of the lower end of the evaluation target stone. When the acceleration detected by the provided acceleration sensor is acceleration AC2, and the acceleration detected by the acceleration sensor provided near the upper end of the stone adjacent to the lower part of the evaluation target stone is acceleration AC3, Since the translational acceleration HAC is calculated by the above equation (1), the time history information of the translational acceleration can be acquired more easily, and as a result, the stable state of the stone constituting the stone wall can be evaluated more easily. .

[Second Embodiment]
In the second embodiment, a description will be given of an example of a case where a stable state of a stone is evaluated using time history information of rotational acceleration. The configuration of the stable state evaluation system 10 according to the second embodiment and the data structures of the databases DB1 and DB2 are the same as those according to the first embodiment (see FIGS. 1 to 6). Since it is the same, description here is abbreviate | omitted.

  Also in the stable state evaluation system 10 according to the second embodiment, as shown in FIG. 44 as an example, the movement of the individual stones constituting the stone wall is translated at the interface between the stones and the stones. It can be divided into motion and rotational motion centered on the bottom of the stone, and as shown in FIG. 1, the stones in the stone wall (not shown) formed by stacking a plurality of stones Acceleration time history information indicating an acceleration response when a striking force is applied by the impulse hammer 16 to the evaluation target stone 50 to be evaluated for the stable state is acquired via the acceleration sensor 14, and the acquired acceleration time is acquired. The static rigidity of the evaluation target stone 50 is detected based on the acceleration response indicated by the history information, and the stable state of the evaluation target stone 50 is evaluated based on the static rigidity. That.

  Here, in the stable state evaluation system 10 according to the second exemplary embodiment, time history information of rotational acceleration is adopted as the acceleration time history information. As shown in FIG. 49 as an example, an acceleration sensor is used. 14 is provided in the vicinity of the upper end portion and the lower end portion of the evaluation target stone 50, and acceleration time history information when the impact hammer 16 applies a striking force to the substantially central portion in front view of the evaluation target stone 50 is displayed for each acceleration. It is acquired by the sensor 14 and recorded in the measurement information database DB2.

  Next, the operation of the stable state evaluation system 10 according to the second embodiment will be described.

  First, the operation of the stable state evaluation system 10 when acquiring acceleration time history information in a plurality of evaluation target stones 50 will be described.

  At this time, as described above, the worker provides the acceleration sensor 14 in the vicinity of the upper end portion and the lower end portion of any one of the plurality of evaluation target stone materials 50. Then, the worker gives a striking force to the substantially central portion of the evaluation target stone 50 in front view by the impulse hammer 16.

  In response to the application of the striking force, acceleration information indicating the measurement result of acceleration is output from each acceleration sensor 14, while striking force information indicating the striking force is output from the impulse hammer 16.

  The acceleration information and the striking force information are amplified to a predetermined level range by the amplifier 18 and then recorded by the data recorder 20. At this time, the acceleration information is output from the acceleration sensor 14 in real time in time series immediately after the impact force is applied by the impulse hammer 16, and is recorded in the data recorder 20 as acceleration time history information. . Further, the striking force information is output from the impulse hammer 16 sequentially in real time in chronological order immediately after the striking force is applied to the evaluation target stone 50, and this is output to the data recorder 20 as striking force time history information. Record.

  At this time, the worker performs the impact on the evaluation target stone 50 with the impulse hammer 16 in the order determined in advance. Thereby, since the striking force time history information and the acceleration time history information are recorded in the data recorder 20 in the predetermined order, the PC 12 corresponds to the stone number corresponding to the order recorded in the data recorder 20. The striking force time history information and the acceleration time history information are registered in the measurement information database DB2 in a state associated with.

  By the above process, the measurement information database DB2 shown in FIG. 6 is constructed as an example.

  Next, referring to FIG. 10, the stable state evaluation system 10 according to the second embodiment when the stable state of the evaluation target stone 50 is evaluated using the measurement information database DB2 constructed by the above procedure. The operation of will be described. Note that FIG. 10 is a diagram that is executed by the CPU 12 </ b> A of the PC 12 when a user inputs a stable state evaluation instruction via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 2nd Embodiment, and the said program is beforehand memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case where the stone wall information database DB1 and the measurement information database DB2 are constructed in advance to avoid complications will be described.

  In step 200 in the figure, the striking force time history information and the acceleration time history information corresponding to any one of the evaluation target stones 50 are read from the measurement information database DB2, and in the next step 202, the following equation (3) is used. Rotational acceleration time history information is calculated. In equation (3), AC1 represents acceleration measured by an acceleration sensor provided near the upper end of the evaluation target stone 50, and AC2 is measured by an acceleration sensor provided near the lower end of the evaluation target stone 50. D represents the distance between the acceleration sensor provided in the vicinity of the upper end of the evaluation target stone 50 and the acceleration sensor provided in the vicinity of the lower end, and KAC represents the rotational acceleration, corresponding to the same time. By substituting the acceleration AC1 and the acceleration AC2 into the equation (3), the time history information of the rotational acceleration is calculated.

In the next step 204, the striking force spectrum is derived by Fourier-transforming the striking force time history information read out in the step 200, and the rotational acceleration time history calculated in the step 202 is calculated. The spectrum of rotational acceleration is derived by Fourier transforming the information.

  In the next step 206, an acceleration relating to the rotational motion is calculated by dividing the spectrum of the rotational acceleration derived by the processing of the above step 204 by the spectrum of the striking force, and in the next step 208, the spectrum of the striking force is calculated. Then, the dynamic stiffness relating to the rotational motion is calculated by dividing the rotational acceleration spectrum by the rotational motion displacement spectrum obtained by integrating twice, and stored in a predetermined area of the secondary storage unit 12D.

  In the next step 210, the change per predetermined frequency in the vicinity of the dominant frequency in the acceleration related to the rotational motion calculated by the processing of step 206 from the dynamic rigidity related to the rotational motion calculated by the processing of step 208. Rigidity whose amount is within a predetermined range is detected as static rigidity. In the stable state evaluation processing program according to the second embodiment, the predetermined range can be determined as static rigidity if the change amount is included in the range. Although the range previously obtained by experiment etc. is applied, it is not restricted to this.

  In the next step 212, the time history information of the rotational acceleration is integrated twice, or the displacement time history is calculated by inversely transforming the displacement spectrum of the rotational motion, and an attenuation constant is calculated based on the displacement time history. Is calculated and stored in a predetermined area of the secondary storage unit 12D.

  In the stable state evaluation processing program according to the second embodiment, the attenuation constant h is calculated using the above equation (2).

  In the stable state evaluation processing program according to the second embodiment, the displacement time history is calculated by inverse Fourier transform of the displacement spectrum of the rotational motion.

  In the next step 214, it is determined whether or not the processing of step 200 to step 212 has been completed for all the evaluation target stones 50. If a negative determination is made, the process returns to step 200, but an affirmative determination is made. At this point, the process proceeds to step 216. In addition, when repeatedly performing the process of the said step 200-step 214, it is made to make the evaluation object stone 50 which was not made into a process target so far become a process target.

  In step 216, the static rigidity of all the evaluation target stones 50 stored by the processing of step 210 is read, and the stable state of the evaluation target stone 50 is determined (evaluated) based on the static rigidity. In the stable state evaluation processing program according to the second embodiment, the processing of step 216 is performed by fixing the evaluation target stone 50 whose static stiffness is lower than a predetermined level compared to the other evaluation target stone 50. This is done by identifying the stone as being low and unstable.

  In the stable state evaluation processing program according to the second embodiment, a value of a predetermined ratio (as an example, 50%) of the maximum static stiffness value of each evaluation target stone 50 is applied as the predetermined level. However, the present invention is not limited to this, and the predetermined level may be set as appropriate in accordance with the application of the stable state evaluation system 10 and the required accuracy. In addition, the determination process performed in step 216 is not limited to the relative determination process based on comparison with the other evaluation target stone 50 as described above. For example, the static rigidity in the stable stone is a reference value. As described above, the stability of the evaluation target stone 50 based on the calculated static rigidity, such as a form in which the evaluation target stone 50 having a static rigidity smaller than the reference value by a predetermined value or more is identified as a defective stone. Any form can be applied as long as the state is evaluated.

  In the next step 218, information indicating a result screen indicating the evaluation result in a predetermined format is configured based on the determination result of the stable state of the evaluation target stone 50 obtained by the processing in step 216, and In the next step 220, the result screen is displayed on the display 12F based on the configured information, and then the stable state evaluation processing program is terminated. Note that the result screen shown in FIG. 9 is also displayed on the display 12F in the processing of step 220 of the stable state evaluation processing program according to the second embodiment. Therefore, the user of the stable state evaluation system 10 can easily grasp the stone material to be prioritized when taking countermeasures by referring to the result screen.

  As described above in detail, in the present embodiment, the evaluation target stone when the striking force is applied to the evaluation target stone that is the evaluation target of the stable state of the stone wall formed by stacking a plurality of stones. In addition to obtaining the rotational acceleration time history information, obtaining the striking force time history information, detecting the static stiffness of the rotational motion based on the rotational acceleration time history information and the striking force time history information, Since the stability state of the evaluation target stone is evaluated based on the detected static rigidity and information indicating the evaluation result is displayed, the stability state of the stone constituting the stone wall is increased without dismantling the stone wall. The accuracy can be evaluated.

  Further, in the present embodiment, the striking force spectrum is derived based on the striking force time history information, and the rotational acceleration spectrum is deduced based on the rotational acceleration time history information. Acceleration relating to rotational motion is calculated by dividing the spectrum by the spectrum of the impact force, and the impact force spectrum is divided by the displacement spectrum of the rotational motion obtained by integrating the rotational acceleration spectrum twice. Thus, the dynamic stiffness related to the rotational motion is calculated, and the change amount per predetermined frequency in the vicinity of the dominant frequency in the acceleration related to the rotational motion from the dynamic stiffness related to the rotational motion is within a predetermined range. Since the rigidity is detected as the static rigidity related to the rotational motion, the stone wall can be constructed more easily and with high accuracy. A stable state of stone that can be evaluated.

  In particular, in the present embodiment, the evaluation target stone is evaluated by evaluating that the static rigidity of the evaluation target stone is lower than that of the other evaluation target stone, and the degree of fixation is low and unstable. Therefore, it is possible to evaluate the stable state of the stone constituting the stone wall more easily.

  Further, in the present embodiment, acceleration sensors are provided in the vicinity of the upper end portion and the lower end portion of the evaluation target stone, and the acceleration detected by the acceleration sensor provided in the vicinity of the upper end of the evaluation target stone is measured. The acceleration detected by the acceleration sensor provided near the lower end of the evaluation target stone is set as an acceleration AC2, and the acceleration sensor provided near the upper end of the evaluation target stone is provided near the lower end. When the distance of the obtained acceleration sensor is D, the rotational acceleration KAC is calculated by the equation (3), so that the time history information of the rotational acceleration can be obtained more easily. It is possible to evaluate the stable state of the stone material that constitutes.

[Third Embodiment]
In the third embodiment, a description will be given of an example of a case where the stable state of a stone is evaluated using time history information of each of translational acceleration and rotational acceleration. The configuration of the stable state evaluation system 10 according to the third embodiment and the data structures of the databases DB1 and DB2 are the same as those according to the first embodiment (see FIGS. 1 to 6). Since it is the same, description here is abbreviate | omitted.

  Also in the stable state evaluation system 10 according to the third embodiment, as shown in FIG. 44 as an example, the movement of individual stones constituting the stone wall is translated at the interface between the stones and the stones. It can be divided into movement and rotational movement centered on the bottom of the stone, and as shown in FIG. 1, the stones in the stone wall (not shown) formed by stacking a plurality of stones The acceleration time history information indicating the acceleration response when the striking force is applied by the impulse hammer 16 to the evaluation target stone 50 to be evaluated for the stable state is acquired via the acceleration sensor 14, and the acquired acceleration time is acquired. The static rigidity of the evaluation target stone 50 is detected based on the acceleration response indicated by the history information, and the stable state of the evaluation target stone 50 is evaluated based on the static rigidity. That.

  Here, in the stable state evaluation system 10 according to the third exemplary embodiment, time history information of both translational acceleration and rotational acceleration is adopted as the acceleration time history information, which is shown in FIG. 49 as an example. As described above, the acceleration sensor 14 is provided in the vicinity of the upper end portion and the lower end portion of the evaluation target stone material 50, and is provided in the vicinity of the upper end portion of the stone material adjacent to the lower portion of the evaluation target stone material 50. The acceleration time history information when the impact force is applied to the central portion by the impulse hammer 16 is acquired by each acceleration sensor 14 and recorded in the measurement information database DB2. Here, when the evaluation target stone 50 is located at the lower end of the stone wall to be evaluated, there is no stone at the lower part of the evaluation target stone 50, but in this case, the vicinity of the upper end and the lower end of the evaluation target stone 50 The acceleration sensor 14 is provided only in the vicinity of the part.

  In FIG. 24, the position of the acceleration sensor with respect to the stone adjacent to the lower part of the evaluation target stone is the central portion in the vertical direction of the stone, but the translational acceleration is the acceleration at the lower end of the evaluation target stone. And the difference in acceleration of the upper end of the stone adjacent to the lower part of the evaluation target stone, it is preferable to be as close as possible to the upper end of the stone adjacent to the lower part of the evaluation target stone. This form is applied. In addition to this form, for example, an acceleration sensor is provided at two different points in the vertical direction of the stone adjacent to the lower part of the evaluation target stone, and the interpolation at the upper end is performed using the measurement values obtained by the two acceleration sensors. It is also possible to calculate acceleration. Similarly, for the stone to be evaluated, acceleration sensors may be provided at two points in different vertical directions, and the acceleration at the lower end may be calculated by interpolation using the measurement values of the two points of the acceleration sensor. it can.

  Next, the operation of the stable state evaluation system 10 according to the third embodiment will be described.

  First, the operation of the stable state evaluation system 10 when acquiring acceleration time history information in a plurality of evaluation target stones 50 will be described.

  At this time, as described above, the worker provides the acceleration sensor 14 in the vicinity of the upper end and the lower end of any one of the plurality of evaluation target stones 50, and is adjacent to the lower part of the evaluation target stone 50. When there is a stone, the acceleration sensor 14 is provided in the vicinity of the upper end of the stone. Then, the worker gives a striking force to the substantially central portion of the evaluation target stone 50 in front view by the impulse hammer 16.

  In response to the application of the striking force, acceleration information indicating the measurement result of acceleration is output from each acceleration sensor 14, while striking force information indicating the striking force is output from the impulse hammer 16.

  The acceleration information and the striking force information are amplified to a predetermined level range by the amplifier 18 and then recorded by the data recorder 20. At this time, the acceleration information is output from the acceleration sensor 14 in real time in time series immediately after the impact force is applied by the impulse hammer 16, and is recorded in the data recorder 20 as acceleration time history information. . Further, the striking force information is output from the impulse hammer 16 sequentially in real time in chronological order immediately after the striking force is applied to the evaluation target stone 50, and this is output to the data recorder 20 as striking force time history information. Record.

  At this time, the worker performs the impact on the evaluation target stone 50 with the impulse hammer 16 in the order determined in advance. Thereby, since the striking force time history information and the acceleration time history information are recorded in the data recorder 20 in the predetermined order, the PC 12 corresponds to the stone number corresponding to the order recorded in the data recorder 20. The striking force time history information and the acceleration time history information are registered in the measurement information database DB2 in a state associated with. In addition, when the evaluation target stone 50 is located at the lower end of the stone wall to be evaluated, the acceleration time history information in the vicinity of the upper end of the stone adjacent to the lower part of the evaluation target stone 50 indicates that there is no acceleration. 0 (zero) is registered in the measurement information database DB2.

  By the above process, the measurement information database DB2 shown in FIG. 6 is constructed as an example.

  Next, referring to FIG. 11, the stable state evaluation system 10 according to the third embodiment when evaluating the stable state of the evaluation target stone 50 using the measurement information database DB2 constructed by the above procedure. The operation of will be described. FIG. 11 shows a stable state that is executed by the CPU 12A of the PC 12 when a user inputs a stable state evaluation execution instruction via an input device (not shown) such as a keyboard provided in the PC 12. It is a flowchart which shows the flow of a process of an evaluation process program, and the said program is previously memorize | stored in the program area | region PG of secondary storage part 12D. Here, a case where the stone wall information database DB1 and the measurement information database DB2 are constructed in advance to avoid complications will be described.

  In step 300 of the figure, the striking force time history information and the acceleration time history information corresponding to any one of the evaluation target stones 50 are read from the measurement information database DB2, and in the next step 302, translation is performed according to the above equation (1). While calculating the time history information of acceleration, the time history information of rotational acceleration is calculated by the above equation (3).

  In the next step 304, the striking force spectrum is derived by Fourier transforming the striking force time history information read out in the processing of step 300, and the time history of translational acceleration calculated by the processing of step 302 is obtained. The translation acceleration spectrum is derived by Fourier transforming the information, and the rotational acceleration spectrum is derived by Fourier transforming the rotational acceleration time history information calculated by the processing in step 302.

  In the next step 306, the acceleration related to the translational motion is calculated by dividing the spectrum of the translational acceleration derived by the process of the above step 304 by the spectrum of the impact force, and the rotational acceleration derived by the process of the above step 304 is calculated. The acceleration of the rotational motion is calculated by dividing the spectrum of the impact force by the spectrum of the impact force. In the next step 308, the impact force spectrum is obtained by integrating the translation acceleration spectrum twice. The dynamic stiffness for translational motion is calculated by dividing by the motion displacement spectrum, and the striking force spectrum is divided by the rotational motion displacement spectrum obtained by integrating the rotational acceleration spectrum twice. Dynamics with respect to rotational motion It calculates the sex, stores information indicating the dynamic stiffness in a predetermined area of the secondary storage unit 12D.

  In the next step 310, the change per predetermined frequency in the vicinity of the dominant frequency in the acceleration relating to the translational motion calculated by the processing in step 306 from the dynamic stiffness related to the translational motion calculated in the processing in step 308. The stiffness within the predetermined range is detected as the static stiffness related to the translational motion, and the rotational motion calculated by the processing of step 306 is calculated from the dynamic stiffness related to the rotational motion calculated by the processing of step 308. In the vicinity of the prevailing frequency in the acceleration related to the rigidity, the rigidity that the variation per predetermined frequency is within the predetermined range is detected as the static rigidity related to the rotational motion, and the detected static rigidity is stored in the secondary storage unit 12D. Store in a predetermined area. In the stable state evaluation processing program according to the present embodiment, as the predetermined range, if the change amount is included in the range, the range that can be determined as static rigidity is translated. The range obtained by experiments or the like in advance is applied to each of the motion and the rotational motion, but is not limited thereto.

  In the next step 312, the time history information of the translational acceleration is integrated twice or the displacement time history of the translational motion is calculated by inverse Fourier transform of the displacement spectrum of the translational motion, and based on the displacement time history. Calculating the translational damping time constant, integrating the rotational acceleration time history information twice, or inversely transforming the rotational motion displacement spectrum to calculate the rotational motion displacement time history, Based on the displacement time history, an attenuation constant of rotational motion is calculated, and the calculated attenuation constant is stored in a predetermined area of the secondary storage unit 12D.

  Note that, also in the stable state evaluation processing program according to the third embodiment, the attenuation constant h is calculated using the above equation (2).

  In the stable state evaluation processing program according to the third embodiment, the displacement time history of the translational motion is calculated by inversely transforming the displacement spectrum of the translational motion, and the displacement time history of the rotational motion is calculated. The displacement spectrum of the rotational motion is calculated by inverse Fourier transform.

  In the next step 314, it is determined whether or not the processing of the above step 300 to step 312 has been completed for all the evaluation target stone materials 50. If the determination is negative, the process returns to the above step 300, but the determination is positive. At this point, the process proceeds to step 316. In addition, when repeatedly performing the process of the said step 300-step 314, it is made to make the evaluation object stone 50 which was not made into a process target so far become a process target.

  In step 316, the static rigidity of all the evaluation target stones 50 stored by the processing of step 310 is read, and the stable state of the evaluation target stone 50 is determined (evaluated) based on the static rigidity, and the determination is made. Information indicating the result is stored in a predetermined area of the secondary storage unit 12D. In the stable state evaluation processing program according to the third embodiment, at least one of the static stiffness related to the translational motion and the static stiffness related to the rotational motion is compared with the other stones 50 to be evaluated. Then, the evaluation target stone 50 that is smaller than the predetermined level is identified by identifying it as an unstable stone with a low degree of fixation.

  In the stable state evaluation processing program according to the third embodiment, a value of a predetermined ratio (for example, 50%) of the maximum value of the corresponding static stiffness of each evaluation target stone 50 is applied as the predetermined level. However, the present invention is not limited to this, and the predetermined level may be set as appropriate in accordance with the application of the stable state evaluation system 10 and the required accuracy. In addition, the determination process performed in step 316 is not limited to the relative determination process by comparison with the other evaluation target stone 50 as described above. For example, the static stiffness in a stable stone is a reference value. As described above, the stability of the evaluation target stone 50 based on the calculated static rigidity, such as a form in which the evaluation target stone 50 having a static rigidity smaller than the reference value by a predetermined value or more is identified as a defective stone. Any form can be applied as long as the state is evaluated.

  By the way, since the force of striking the stone flows to all surrounding stone materials, the force acting between the upper and lower stone materials becomes smaller than the force measured by the impulse hammer. Therefore, the dynamic rigidity obtained by measurement does not necessarily represent the rigidity between the upper and lower stones. Therefore, by adjusting the simulated static impact (spring constant) and damping constant so as to simulate the impact test, the more accurate parameters can be obtained, the more accurate stability evaluation can be performed. .

  Therefore, in the next step 318, the static stiffness and damping constant obtained by the above process are analyzed by inverse analysis using the time history information of the corresponding acceleration (in this embodiment, inverse analysis using a genetic algorithm). The adjustment processing routine program to be adjusted is executed. The genetic algorithm is a technique for searching for the optimal solution in a certain solution space by applying Darwin's evolution theory, and can be applied to a problem that cannot be differentiated. Is also applicable.

  Hereinafter, the adjustment processing routine program will be described with reference to FIG. FIG. 12 is a flowchart showing the flow of processing of the adjustment processing routine / program. The program is also stored in advance in the program area PG of the secondary storage unit 12D.

  First, in step 350, the static stiffness (spring constant) stored by the processing of step 310 and the damping constant stored by the processing of step 312 are read from the secondary storage unit 12D, and the read static stiffness and damping are read. A constant is coded in binary, and a plurality of candidate groups (hereinafter referred to as “individual group”) are created by random numbers.

  In the next step 352, how much each individual is suitable as a solution (fitness) is evaluated, and in the next step 354, an unsuitable individual is deleted. Crossover for creating a new individual (solution candidate) from the individual is performed, and in the next step 358, mutation for creating a new solution candidate with a random number is performed.

  In the next step 360, it is determined whether or not a predetermined end condition is satisfied. If a negative determination is made, the process returns to step 352. finish. In the adjustment processing routine program according to the third embodiment, as the end condition in step 360, the number of repetitions of the processing in steps 352 to 358 is a predetermined number (for example, 10,000 times). However, the present invention is not limited to this. For example, other forms such as a form in which the condition that the fitness is a predetermined value or more may be applied.

  Here, there are various methods for coding the individual and evaluating the fitness. For example, a range of values of static stiffness and damping constant is appropriately set, and each constant is set to 0 to 1 within the range. A method of binary encoding as a fixed point within the range up to can be exemplified. As the fitness evaluation, as shown in the following equation (4), a correlation coefficient between the acceleration f (t) obtained by the experiment and the acceleration g (t) obtained by the analysis is obtained. The analysis can be performed by assuming that the fitness is large although the correlation coefficient is large.

Since the genetic algorithm is a conventionally known method, further explanation here is omitted.

  When the adjustment processing routine program ends, the process proceeds to step 320 of the stable state evaluation processing program, and the static stiffness and damping constant after adjustment by the adjustment processing routine program obtained by the above processing are used. A mass system analysis is performed as shown in

  First, a vibration model of a mass system is constructed using the static stiffness and damping constant.

That is, as an example, if the movement of each stone of the stone wall as shown in the left figure of FIG. 13 is considered to be a translational movement and a rotational movement around the stone bottom, the translation spring and rotation installed between the stone and the stone As an example, a mass point system analysis model as shown in the right diagram of FIG. 13 is created using a spring. In the figure, the stone (6) is omitted in order to avoid complexity. In the figure, h _i represents the height of the stone i, u _i represents the displacement of the stone i, θ _i represents the rotation angle of the stone i, and kh _ij represents the translation between the stone i and the stone j. The spring constant is represented, and kr _ij represents the rotational spring constant between the stone material i and the stone material j.

  On the other hand, a general equation of motion is expressed by the following equation (5).

From this general equation of motion and the analysis model shown on the right side of FIG. 13, for example, the equation of motion represented by the following equation is obtained. Incidentally, m _i denotes the mass of the stone i in the following equation, f _i denotes the external force acting on the stone i, I _i represents the moment of inertia of the stone i. Further, in the following equation, an arithmetic expression corresponding to the stone (5) is omitted.

By making this equation of motion into a matrix format, a stiffness matrix K and a mass matrix M are obtained. Further, the attenuation matrix C is rigid proportional attenuation as shown in the following equation, and the proportionality constant β is set to match the attenuation constant obtained from the displacement.

For this mass system analysis model, the seismic waves set appropriately such as past observation records such as the Great Hanshin Earthquake and design earthquake waves established by the building center etc. are input as external forces, and the displacement of each stone is obtained.

  For example, there are a mode analysis method, a direct numerical integration method, and the like as a method of the seismic response analysis for analyzing the vibration caused by the seismic wave based on the equation of motion. The maximum displacement of each stone is obtained from the calculated displacement, and if there is a stone that has a displacement larger than a predetermined amount, it is determined that the stone wall has low stability.

  In the next step 322, an evaluation result in a predetermined format is shown based on the result of the above-described mass point system analysis and the determination result of the stable state of the evaluation target stone 50 obtained by the processing in step 316. Information indicating the result screen is configured, and in the next step 324, the result screen is displayed on the display 12F based on the configured information, and then the stable state evaluation processing program is terminated.

  FIG. 14 shows an example of the display state of the result screen displayed on the display 12F by the process of step 324 of the stable state evaluation processing program. As shown in the figure, in the stable state evaluation processing program according to the present embodiment, information indicating that there is a possibility of collapse as a result of the mass system analysis is displayed, and the above step 316 is performed. Stones that are determined to have a low degree of fixation by the process of are displayed. Therefore, by referring to the result screen, the user of the stable state evaluation system 10 can easily grasp the possibility of collapse due to an earthquake and the stone material to be prioritized when taking countermeasures.

  As described above in detail, in the present embodiment, the evaluation target stone when the striking force is applied to the evaluation target stone that is the evaluation target of the stable state of the stone wall formed by stacking a plurality of stones. Time history information of translational acceleration and time history information of rotational acceleration at the same time, time history information of the striking force is obtained, and translational motion based on the time history information of the translational acceleration and time history information of the striking force The static stiffness is detected, the static stiffness related to the rotational motion is detected based on the time history information of the rotational acceleration and the time history information of the striking force, and the stable state of the evaluation target stone material based on the detected static stiffness Since the information indicating the evaluation result is displayed, the stable state of the stone material constituting the stone wall can be evaluated with high accuracy without dismantling the stone wall.

  Further, in the present embodiment, a spectrum of the impact force is derived based on the time history information of the impact force, a spectrum of translation acceleration is derived based on the time history information of the translation acceleration, and the rotational acceleration The rotational acceleration spectrum is derived on the basis of the time history information, and the translational acceleration spectrum is divided by the striking force spectrum to calculate the acceleration related to the translational motion, and the rotational acceleration spectrum is calculated as the striking force. By dividing the spectrum of the impact force by the spectrum of the translational motion obtained by integrating the spectrum of the translational acceleration twice. While calculating the dynamic stiffness for motion, the striking force spectrum The dynamic stiffness related to the rotational motion is calculated by dividing by the displacement spectrum of the rotational motion obtained by integrating the rotational acceleration spectrum twice, and from the dynamic stiffness related to the translational motion to the acceleration related to the translational motion. In the vicinity of the prevailing frequency, the rigidity that the variation per predetermined frequency is within a predetermined range is detected as the static rigidity related to the translational motion, and from the dynamic stiffness related to the rotational motion to the acceleration related to the rotational motion Stiffness of the stones that make up the stone wall is simpler and more accurate because the stiffness around the prevailing frequency is detected as the static stiffness related to the rotational motion. The state can be evaluated.

  In particular, in the present embodiment, the evaluation target stone is evaluated by evaluating that the static rigidity of the evaluation target stone is lower than that of the other evaluation target stone, and the degree of fixation is low and unstable. Therefore, it is possible to evaluate the stable state of the stone constituting the stone wall more easily.

  In the present embodiment, the displacement time history is calculated by integrating the time history information of the translation acceleration twice or inversely transforming the displacement spectrum of the translation motion for all the evaluation target stones. And calculating the damping time history by integrating the time history information of the rotational acceleration twice or by inverse Fourier transforming the displacement spectrum of the rotational motion. By calculating a damping constant based on the displacement time history, and performing a mass system analysis based on the calculated damping constants and static stiffness of all the evaluation target stones, the overall stability of the evaluation target stones Since the state is evaluated, the stable state of the stone material that constitutes the stone wall can be evaluated with higher accuracy.

  In particular, in the present embodiment, the damping constant and the static stiffness are adjusted by inverse analysis using the corresponding translation acceleration time history information and rotational acceleration time history information. It is possible to evaluate the stable state of the stone material that constitutes.

  In particular, in the present embodiment, since the inverse analysis is performed using a genetic algorithm, it is possible to evaluate the stable state of the stone constituting the stone wall more easily and with high accuracy.

  Further, in the present embodiment, acceleration sensors are provided in the vicinity of the upper end and the lower end of the evaluation target stone and in the vicinity of the upper end of the stone adjacent to the lower portion of the evaluation target stone, and the upper end of the evaluation target stone The acceleration detected by the acceleration sensor provided in the vicinity of the part is acceleration AC1, the acceleration detected by the acceleration sensor provided in the vicinity of the lower end part of the evaluation target stone is acceleration AC2, and the lower part of the evaluation target stone The acceleration detected by the acceleration sensor provided in the vicinity of the upper end of the stone adjacent to the acceleration is AC3, and the acceleration sensor provided in the vicinity of the upper end of the evaluation target stone and the acceleration provided in the vicinity of the lower end. When the distance of the sensor is D, the translation acceleration HAC and the rotation acceleration KAC are calculated by the equations (1) and (3). More simple translational acceleration time history information and the results can obtain time history information of the rotational acceleration of, it is possible to evaluate the stability condition of the stone that constitutes the stone more simply.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the present invention, and embodiments to which such changes or improvements are added are also included in the technical scope of the present invention.

  The above embodiments do not limit the invention according to the claims (claims), and all the combinations of features described in the embodiments are essential for the solution means of the invention. Is not limited. The above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. Even if some constituent requirements are deleted from all the constituent requirements shown in the above-described embodiment, as long as an effect is obtained, a configuration from which these several constituent requirements are deleted can be extracted as an invention.

  For example, in each of the above embodiments, the case where the displacement time history is calculated by performing Fourier transform on the displacement spectrum of the translational motion or the rotational motion has been described, but the present invention is not limited to this, for example, The displacement time history may be calculated by integrating twice the time history information of translational acceleration or the time history information of rotational acceleration. Also in this case, the same effects as those of the above embodiments can be obtained.

  In addition, the configuration (see FIGS. 1 to 3) of the stable state evaluation system 10 described in each of the above embodiments is an example, and unnecessary portions may be deleted within a scope that does not depart from the gist of the present invention. Needless to say, you can add new parts.

  The data structures of the databases shown in the above embodiments (see FIGS. 4 and 6) are also examples, and unnecessary information can be deleted or newly created without departing from the gist of the present invention. Needless to say, you can add information.

  Further, the processing flow (see FIGS. 7, 10, 11, and 12) of the various processing programs shown in the above embodiments is also an example, and is unnecessary within the scope of the present invention. It goes without saying that steps can be deleted, new steps can be added, and the processing order can be changed.

  Furthermore, the configuration of the result screens shown in the above embodiments (see FIGS. 9 and 14) is also an example, and it goes without saying that it can be changed without departing from the gist of the present invention.

It is a block diagram which shows the structure of the stable state evaluation system which concerns on embodiment. It is a block diagram which shows the principal part structure of the electrical system of PC which concerns on embodiment. It is a schematic diagram which shows the main memory content of the secondary memory | storage part with which the PC which concerns on embodiment was equipped. It is a schematic diagram which shows the data structure of the stone wall information database which concerns on embodiment. It is a figure with which it uses for description of the stone wall information database which concerns on embodiment, and is a front view of the stone wall which shows the specific example of stone material number information and position information. It is a schematic diagram which shows the data structure of the measurement information database which concerns on embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 1st Embodiment. It is a graph with which it uses for description of calculation of the attenuation constant in the stable state evaluation processing program which concerns on embodiment. It is the schematic which shows the example of a display state of the result screen which concerns on 1st, 2nd embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 2nd Embodiment. It is a flowchart which shows the flow of a process of the stable state evaluation processing program which concerns on 3rd Embodiment. It is a flowchart which shows the flow of a process of the adjustment process routine program which concerns on 3rd Embodiment. It is a schematic diagram which shows an example of the motion model with which it uses for description of the mass point system analysis which concerns on 3rd Embodiment. It is the schematic which shows the example of a display state of the result screen which concerns on 3rd Embodiment. FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention and is a graph showing a time history of acceleration according to an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention and is a graph showing a time history of acceleration according to an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing an acceleration according to an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention and is a graph showing a time history of acceleration according to an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention and is a graph showing a time history of acceleration according to an experiment EA. FIG. 4 is a diagram for explaining the principle of the present invention and is a graph showing a Fourier spectrum of acceleration according to an experiment EA. FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of Experiment G; FIG. 4 is a diagram for explaining the principle of the present invention, and is a graph showing acceleration and dynamic rigidity according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to translational motion according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to rotational motion according to Experiment G; FIG. 4 is a diagram for explaining the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to rotational motion according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to rotational motion according to Experiment G; It is a figure for explanation of the principle of the present invention, and is a figure showing an actual measurement state of Experiment G. FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to rotational motion according to Experiment G; FIG. 4 is a diagram for explaining the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing an acceleration according to an experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing an acceleration according to an experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of Experiment H; It is a figure for explanation of the principle of the present invention, and is a figure showing an actual measurement state of Experiment H. It is a figure for explanation of the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment H. It is a figure for explanation of the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment H. FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing acceleration and dynamic rigidity according to Experiment H; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing acceleration and dynamic rigidity according to Experiment H; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing acceleration and dynamic rigidity according to Experiment H; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing acceleration and dynamic rigidity according to Experiment H; FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic diagram showing a stone motion model. It is a figure for explanation of the principle of the present invention, and is a graph showing time history information of impact force by Experiment G. FIG. 4 is a diagram for explaining the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness related to translational motion according to Experiment G; FIG. 4 is a diagram for explaining the principle of the present invention, and is a graph showing time history information of acceleration according to Experiment G; FIG. 5 is a diagram for explaining the principle of the present invention, and is a schematic front view showing an experimental model of Experiment H; FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness according to Experiment H. FIG. 5 is a diagram for explaining the principle of the present invention and is a schematic front view showing an experimental model of Experiment J4. FIG. 5 is a diagram for explaining the principle of the present invention, and is a graph showing a spectrum of dynamic stiffness according to Experiment J4.

Explanation of symbols

10 stable state evaluation system 12 personal computer 12A CPU (acquisition means, detection means, evaluation means)
12B RAM
12C ROM
12D Secondary storage unit 12E Keyboard 12F Display (display means)
12G I / O interface 14 Acceleration sensor 16 Impulse hammer 18 Amplifier 20 Data recorder 22 Recording / output device 50 Evaluation target stone

Claims (8)

Time history information of translational acceleration and time history information of rotational acceleration when the striking force is applied to the evaluation target stone as an evaluation target of the stable state of the stone wall formed by stacking a plurality of stones And acquiring means for acquiring time history information of the hitting force,
When the time history information of the translation acceleration is acquired by the acquisition means, static rigidity related to the translational motion is detected based on the time history information of the translation acceleration and the time history information of the hitting force, and the acquisition means When the time history information of the rotational acceleration is acquired, detection means for detecting static rigidity related to the rotational motion based on the time history information of the rotational acceleration and the time history information of the impact force;
Evaluation means for evaluating a stable state of the evaluation target stone based on the static rigidity detected by the detection means;
Display means for displaying information indicating an evaluation result by the evaluation means;
A stable state evaluation apparatus. The detection means includes
A spectrum of the striking force is derived based on the time history information of the striking force, and if the time history information of the translation acceleration is acquired by the acquiring means, the translation acceleration is based on the time history information of the translation acceleration. Derivation means for deriving a spectrum of rotational acceleration based on the time history information of the rotational acceleration when the time history information of the rotational acceleration is obtained by the obtaining means;
When the time history information of the translational acceleration is obtained by the obtaining unit, an acceleration relating to translational motion is calculated by dividing the spectrum of the translational acceleration by the spectrum of the impact force, and the rotational acceleration is obtained by the obtaining unit. If the time history information is acquired, an acceleration calculation means for calculating an acceleration relating to the rotational motion by dividing the spectrum of the rotational acceleration by the spectrum of the impact force, and
When the time history information of the translation acceleration is acquired by the acquisition means, the spectrum of the impact force is divided by the displacement spectrum of the translation motion obtained by integrating the spectrum of the translation acceleration twice. When the dynamic stiffness related to the translational motion is calculated and the time history information of the rotational acceleration is acquired by the acquisition means, the striking force spectrum is obtained by integrating the rotational acceleration spectrum twice. Dynamic stiffness calculating means for calculating dynamic stiffness related to the rotational motion by dividing by the displacement spectrum of the rotational motion,
With
When the time history information of the translational acceleration is acquired by the acquisition means, the change amount per predetermined frequency in the vicinity of the dominant frequency in the acceleration related to the translational motion from the dynamic rigidity related to the translational motion is within a predetermined range. If the time history information of the rotational acceleration is acquired by the acquisition means, the dynamic rigidity related to the rotational motion is used for the acceleration related to the rotational motion. The stable state evaluation apparatus according to claim 1, wherein a stiffness in which a change amount per predetermined frequency in the vicinity of the dominant frequency is within a predetermined range is detected as a static stiffness related to the rotational motion. The evaluation means evaluates that the evaluation target stone is lower in the static rigidity and the degree of fixation of the evaluation target stone is smaller than a predetermined level compared to other evaluation target stones, and is unstable. The stable state evaluation apparatus according to claim 2. When the time history information of the translation acceleration is acquired by the acquisition means for all the evaluation target stones, the time history information of the translation acceleration is integrated twice or the displacement spectrum of the translation motion is Fourier-inverted. A displacement time history is calculated by conversion, an attenuation constant is calculated based on the displacement time history, and when the rotational acceleration time history information is acquired by the acquisition means, the rotational acceleration time history information is It further includes an attenuation constant calculating means for calculating the displacement time history by integrating twice or calculating the displacement time history by inversely transforming the displacement spectrum of the rotational motion and calculating the attenuation constant based on the displacement time history,
The evaluation means performs a mass system analysis based on the attenuation constants and the static stiffness of all the evaluation target stones calculated by the attenuation constant calculation means, thereby providing an overall stable state of the evaluation target stones. The stable state evaluation apparatus according to claim 2 or claim 3. Adjustment means for adjusting the damping constant and the static stiffness by inverse analysis using at least one of the corresponding translation acceleration time history information and rotational acceleration time history information acquired by the acquisition means. The stable state evaluation apparatus according to claim 4. When the acquisition means acquires the time history information of the translational acceleration, acceleration sensors are provided in the vicinity of the lower end portion of the evaluation target stone and in the vicinity of the upper end portion of the stone adjacent to the lower portion of the evaluation target stone, When acquiring the time history information of the rotational acceleration, an acceleration sensor is provided in the vicinity of the upper end portion and the lower end portion of the evaluation target stone, and the acceleration sensor provided in the vicinity of the upper end portion of the evaluation target stone The detected acceleration is acceleration AC1, and the acceleration detected by the acceleration sensor provided near the lower end of the evaluation target stone is acceleration AC2, and is provided near the upper end of the stone adjacent to the lower part of the evaluation target stone. The acceleration detected by the obtained acceleration sensor is defined as an acceleration AC3, and the acceleration sensor provided in the vicinity of the upper end portion of the evaluation target stone and the vicinity of the lower end portion thereof. When the vignetting distance of the acceleration sensor is D, it is obtained by calculating the translational acceleration HAC and the rotational acceleration KAC by the following arithmetic expression
The stable state evaluation apparatus of any one of Claims 1-5. Time history information of translational acceleration and time history information of rotational acceleration when the striking force is applied to the evaluation target stone as an evaluation target of the stable state of the stone wall formed by stacking a plurality of stones And acquiring at least one of the following, and obtaining the time history information of the striking force,
When the time history information of the translation acceleration is acquired by the acquisition step, the static stiffness related to the translational motion is detected based on the time history information of the translation acceleration and the time history information of the hitting force. When the rotational acceleration time history information is acquired, a detection step of detecting static stiffness related to rotational motion based on the rotational acceleration time history information and the striking force time history information;
An evaluation step for evaluating the stable state of the evaluation target stone based on the static rigidity detected by the detection step;
A display step of displaying information indicating an evaluation result by the evaluation step by a display means;
A stable state evaluation method comprising: Time history information of translational acceleration and time history information of rotational acceleration when the striking force is applied to the evaluation target stone as an evaluation target of the stable state of the stone wall formed by stacking a plurality of stones Acquiring at least one of the following, and acquiring the time history information of the striking force; and
When the time history information of the translational acceleration is acquired by the acquisition step, static stiffness related to the translational motion is detected based on the time history information of the translational acceleration and the time history information of the striking force. When the time history information of the rotational acceleration is acquired, a detection step of detecting static rigidity related to the rotational motion based on the time history information of the rotational acceleration and the time history information of the striking force;
An evaluation step for evaluating the stable state of the evaluation target stone based on the static stiffness detected by the detection step;
A display step of displaying information indicating an evaluation result by the evaluation step by a display means;
A stable state evaluation program that causes a computer to execute.