JP2018081038A - Deterioration diagnosis device, deterioration diagnosis method, and deterioration diagnosis system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To diagnose deterioration of a structure within a wide range of degree of deterioration.SOLUTION: A deterioration diagnosis device includes: an input part for measuring a vibration waveform of a structure by a plurality of slave units, and inputting a waveform analysis result obtained by performing predetermined waveform analysis processing to the vibration waveform measured by the plurality of slave units; a storage part for storing a reference value of a natural frequency of the structure and a reference value of a vibration gain of the structure; a change rate calculation part for calculating a change rate of the natural frequency of the structure based on the waveform analysis result to the reference value of the natural frequency, and for calculating a change rate of the vibration gain of the structure based on the waveform analysis result to the reference value of the vibration gain; and a determination part for determining a degree of deterioration of the structure based on the change rate of the natural frequency calculated by the change rate calculation part and the change rate of the vibration gain.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a deterioration diagnosis device, a deterioration diagnosis method, and a deterioration diagnosis system.

  Patent Document 1 describes an example of an apparatus for diagnosing deterioration of a structure. The deterioration diagnosis apparatus described in Patent Document 1 stores the natural frequency of a building measured at the time of new construction, measures the natural frequency of the building after a predetermined period or after a disaster such as an earthquake, and stores the stored natural vibration. Diagnose wall deterioration and damage based on the difference between the measured frequency and the measured natural frequency.

JP 2011-084877 A

  In the deterioration diagnosis apparatus described in Patent Document 1, deterioration of a structure is diagnosed based on a change in the natural frequency of a building. However, in the examination by the inventors of the present application, it has been found that the deterioration diagnosis based only on the change of the natural frequency may be as follows. That is, the natural frequency may change relatively large when a relatively large deterioration occurs in the structure, while the natural frequency may not change significantly when the deterioration is not relatively large. In such a case, there is a problem that the deterioration diagnosis based on only the change in the natural frequency may not be able to diagnose a relatively small deterioration.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a deterioration diagnosis device, a deterioration diagnosis method, and a deterioration diagnosis system capable of diagnosing deterioration of a structure in a wide range of the degree of deterioration.

  In order to solve the above-described problem, according to one embodiment of the present invention, a vibration waveform of a structure is measured by a plurality of slave units, and a predetermined waveform analysis process is performed on the vibration waveforms measured by the plurality of slave units. An input unit for inputting a result of the waveform analysis performed; a storage unit for storing a reference value of the natural frequency of the structure and a reference value of the vibration amplification factor of the structure; and the structure based on the result of the waveform analysis A rate of change of the natural frequency of the structure with respect to a reference value of the natural frequency, and a rate of change of the vibration gain of the structure based on the waveform analysis result with respect to the reference value of the vibration gain A deterioration diagnosis apparatus comprising: a calculation unit; and a determination unit that determines a degree of deterioration of the structure based on the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit. .

  Further, one aspect of the present invention is the above-described deterioration diagnosis apparatus, wherein the input unit calculates a value corresponding to the attenuation of the structure calculated by the plurality of slave units based on the vibration waveform. Further input as a result, the storage unit further stores a reference value of a value according to the attenuation of the structure, and the change rate calculation unit according to the attenuation of the structure based on the waveform analysis result And a rate of change of the value corresponding to the damping value with respect to a reference value is further calculated, and the determination unit calculates the rate of change of the natural frequency and the rate of change of the vibration gain calculated by the rate of change calculator. The degree of deterioration of the structure is determined based on the rate of change of the value corresponding to the attenuation.

  Moreover, one aspect of the present invention is the above-described degradation diagnosis apparatus, wherein when the plurality of slave units detect a vibration waveform of a predetermined level or higher, the vibration waveform of the structure is measured for a predetermined time; and The waveform analysis result obtained by performing the predetermined waveform analysis processing on the measured vibration waveform is stored in the predetermined storage device.

  Further, one aspect of the present invention is the above-described deterioration diagnosis apparatus, wherein the plurality of slave units are installed in a fixed part of the structure and one installed in a swinging part of the structure. And a total of two.

  One embodiment of the present invention is a waveform analysis result obtained by measuring a vibration waveform of a structure with a plurality of slave units and performing a predetermined waveform analysis process on the measured vibration waveforms with the plurality of slave units. An input unit for inputting, a storage unit for storing a reference value for the natural frequency of the structure and a reference value for the vibration amplification factor of the structure, and a natural frequency of the structure based on the waveform analysis result. Using a change rate calculation unit that calculates a change rate of the natural frequency with respect to a reference value and calculates a change rate of the vibration gain of the structure based on the waveform analysis result with respect to the reference value of the vibration gain. In the deterioration diagnosis method, the determination unit determines the degree of deterioration of the structure based on the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit.

  Further, according to one embodiment of the present invention, a plurality of vibration waveforms of a structure are measured, and a result obtained by performing a predetermined waveform analysis process on the measured vibration waveforms is stored in a predetermined storage device as a waveform analysis result. A sub unit, an input unit for inputting the waveform analysis result stored in the plurality of sub units, and a storage unit for storing a reference value of the natural frequency of the structure and a reference value of the vibration amplification factor of the structure And calculating a rate of change of the natural frequency of the structure based on the waveform analysis result with respect to a reference value of the natural frequency, and the vibration gain of the structure based on the waveform analysis result A rate-of-change calculating unit that calculates a rate of change with respect to a reference value, and a degree of deterioration of the structure is determined based on the rate of change of the natural frequency and the rate of change of the vibration gain calculated by the rate-of-change calculating unit Deterioration diagnosis provided with a determination unit It is a system.

  According to the present invention, deterioration of a structure can be diagnosed in a wide range of the degree of deterioration.

It is a block diagram which shows the structural example of the deterioration diagnostic system which concerns on one Embodiment of this invention. It is a schematic diagram which shows the example of arrangement | positioning to the building of the subunit | mobile_unit 1 shown in FIG. It is a schematic diagram which shows the other example of arrangement | positioning to the building of the subunit | mobile_unit 1 shown in FIG. It is a block diagram which shows the structural example of the subunit | mobile_unit 1 shown in FIG. It is a block diagram which shows the structural example of PC2 shown in FIG. It is a figure which shows an example of the change of the natural frequency in the deterioration process of a building. It is a figure which shows an example of the change of the natural frequency in the deterioration process of a building. It is a figure which shows an example of the change of the vibration mode in the deterioration process of a building. It is a figure which shows an example of the change of the vibration mode in the deterioration process of a building. It is a flowchart which shows the operation example of the subunit | mobile_unit 1 shown in FIG. It is a flowchart which shows the operation example of the subunit | mobile_unit 1 shown in FIG. It is a flowchart which shows the operation example of PC2 shown in FIG. It is a block diagram which shows the structural example of the deterioration diagnostic system which concerns on other embodiment of this invention. It is a schematic diagram which shows the example of arrangement | positioning to the structure of the subunit | mobile_unit 1 shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a deterioration diagnosis system 100 according to an embodiment of the present invention. A degradation diagnosis system 100 shown in FIG. 1 includes a plurality of slave units 1 and a PC (personal computer) 2 (degradation diagnostic device). In the degradation diagnosis system 100 of the present embodiment, one or a plurality of structures (not shown) are targeted for degradation diagnosis, and at least two slave units 1 are installed for each structure.

  In the degradation diagnosis system 100 shown in FIG. 1, a plurality of slave units 1 are connected to a data server 32, a router 33, and a PC 34 via a LAN (local area network) 31. However, the configuration shown in FIG. 1 is an example, and for example, the slave unit 1 may be wirelessly connected to a communication line such as a mobile communication network (not shown). In this case, the LAN 31, data server 32, router 33, PC 34, etc. can be omitted. For example, the data server 32 stores the measurement result by the slave unit 1 and transmits the stored information to the server group built in the cloud 36 via the Internet 35. However, you may make it the subunit | mobile_unit 1 transmit a measurement result etc. directly via the data server 32 with respect to the server group constructed | assembled in the cloud 36, or PC2. The router 33 connects the LAN 31 to the Internet 35. The PC 34 is a computer having a function equivalent to that of the PC 2 described later, and the PC 34 can perform deterioration diagnosis in the same manner as the PC 2. However, the PC 34 can be omitted.

  The router 38 connects a server group constructed in the cloud 36 and the server 39 via the Internet 37. The server 39 receives and stores information such as measurement results from the plurality of slave units 1 by accessing a predetermined server constructed in the cloud 36, for example. Further, the server 39 provides the stored information to the PC 2 and notifies the result of deterioration diagnosis processing by the PC 2 to a predetermined notification destination.

  Here, with reference to FIG. 2 and FIG. 3, the installation example of the subunit | mobile_unit 1 with respect to the building which is an example of a structure is demonstrated. FIG. 2 is a schematic diagram illustrating an example of installation of the sub unit 1 in a house which is an example of a building, and FIG. 3 is a schematic diagram illustrating an example of the installation of the sub unit 1 in a composite building which is another example of a building. FIG. A house 400 shown in FIG. 2 is a three-story house. In the house 400 shown in FIG. 2, two child devices 1 a and child devices 1 b corresponding to the child device 1 shown in FIG. 1 are installed in the first floor portion 401 and the third floor portion 402 of the house 400. In this case, the first floor portion 401 where the child device 1a is installed is a region close to the first floor (or the foundation of the house 400), and the third floor portion 402 is a region close to the ceiling of the third floor. On the other hand, the composite building 500 shown in FIG. 3 is a seven-story building on the ground first floor. In the complex building 500 shown in FIG. 3, the two child units 1 g and the child units 1 h corresponding to the child unit 1 shown in FIG. 1 are installed in the underground first floor portion 501 and the rooftop portion 502 of the composite building 500. Yes. In this case, the underground first floor portion 501 in which the child unit 1g is installed is an area close to the floor (or foundation) of the first underground floor. In the installation example shown in FIG. 2 and FIG. 3, by limiting the installation location to two places, the fixed part of the building such as the first floor, the first basement floor, and the shaking part near the top floor such as the third floor, the rooftop, The installation of the child unit 1 is simplified. Here, the swaying portion is a portion where vibration due to an earthquake or wind is generally larger than that of the fixed portion. If the structure is a complex system or there is no dynamic design data, multipoint measurement is performed so that at least the primary to tertiary natural frequency (or natural period) and mode value can be grasped at the beginning. It is desirable to provide support materials for deterioration diagnosis. In particular, if the eigenmode shape is measured once, it can cope with subsequent changes. 2 and 3 show an example of installation of the sub unit 1 in a structure such as a building. For example, a plurality of sub units 1 may be installed on the same floor, or on three or more floors. The child unit 1 may be installed.

  The subunit | mobile_unit 1 shown in FIG. 1 has the vibration sensor 11, the process part 12, the memory | storage part 13 (memory | storage device), and the communication part 14, as shown in FIG. The vibration sensor 11 is an acceleration sensor, for example, and outputs a result of detecting acceleration in one direction or a plurality of directions. However, the vibration sensor 11 may be a sensor that detects a vibration level, and is not limited to an acceleration sensor, and may be a displacement sensor, a speed sensor, or the like. The vibration sensor 11 outputs an analog or digital signal indicating the vibration level at the position where the slave unit 1 is installed. In the present embodiment, the vibration level means the acceleration, speed, or magnitude of displacement of vibration.

  The processing unit 12 illustrated in FIG. 4 includes a determination unit 121 and a waveform analysis unit 122. Based on the output signal of the vibration sensor 11, the determination unit 121 determines whether or not a vibration waveform of a predetermined level or higher is detected by the vibration sensor 11. For example, the determination unit 121 compares the peak value, effective value, and the like of the output signal of the vibration sensor 11 with a predetermined threshold (measurement start threshold) to determine whether or not a vibration waveform of a predetermined level or higher is detected. Can be determined. When the determination unit 121 determines that a vibration waveform of a predetermined level or higher is detected by the vibration sensor 11, the processing unit 12 repeatedly captures the output signal of the vibration sensor 11 at a predetermined sampling period for a predetermined time and obtains the measurement value 131. Store in the storage unit 13. In this embodiment, by providing this determination unit 121, it is possible to set a measurement trigger and reduce the number of vibration waveform recordings to the minimum necessary. The measurement starts automatically when the amount of vibration of the structure becomes larger than a certain level due to strong winds or earthquake external force, and ends after a certain time. For example, in the case of a building, it is possible to record for several minutes with a trigger before and after a 100 Gal response that may cause problems such as member damage.

  The waveform analysis unit 122 performs a predetermined waveform analysis process on the output signal of the vibration sensor 11 for a predetermined time, that is, a plurality of samplings stored as the measurement value 131 in the storage unit 13, and the processed result is a waveform analysis result. Stored as 132 in the storage unit 13. In the present embodiment, the output signal of the vibration sensor 11 for a plurality of samplings is also referred to as a vibration waveform. The predetermined waveform analysis processing is eigenvalue analysis, for example, and is processing for obtaining the natural frequency and vibration mode of the structure. The eigenvalue analysis can be performed by a known method. Alternatively, the predetermined waveform analysis process is, for example, a frequency analysis process (spectrum analysis process) that is a process of converting a time history vibration waveform into a waveform on the frequency axis. In this case, the natural frequency of the structure is calculated in, for example, PC2. For example, the waveform analysis unit 122 decomposes the vibration waveform stored in the storage unit 13 into a plurality of frequency components, and calculates a level for each frequency component. Alternatively, the predetermined waveform analysis process is a process for obtaining a value corresponding to the attenuation of the structure for each natural frequency, for example. The value corresponding to the attenuation is, for example, a logarithmic attenuation factor or an attenuation ratio. For example, the waveform analysis unit 122 performs an autocorrelation analysis on the vibration waveform stored in the storage unit 13 and calculates a logarithmic attenuation rate and an attenuation ratio. Then, the waveform analysis unit 122 stores the calculated eigenvalue analysis result and the frequency analysis result, or the eigenvalue analysis result and the frequency analysis result and the calculation result of the value according to the attenuation in the storage unit 13 as the waveform analysis result 132. To do.

  In this embodiment, by providing the waveform analysis unit 122, the slave unit 1 (or the data server 32) does not store the vibration waveform itself, but performs a predetermined primary such as eigenvalue analysis and frequency analysis on the vibration waveform. The processed analysis result is stored. According to this, the capacity | capacitance of the preservation | save data number memorize | stored in the subunit | mobile_unit 1 side can be decreased, and the subunit | mobile_unit 1 etc. can be simplified easily. Conventionally, in the case of earthquakes, observation of time history data is enormous. Although it is an approximation, the number of time history data = (100 to 1000) / second × (tens of minutes) × (number of earthquakes) is stored, but what we really want to know is the maximum value. On the other hand, from the viewpoint that the eigenvalue characteristics determine the behavior of the structure against disturbances such as earthquake strong winds, when the primary processing called frequency analysis is performed, the number of data is reduced to about (approximately 100 / times) × (times), If only this reduced data is stored, the memory capacity can be greatly reduced. That is, in the present embodiment, a technique is employed in which eigenvalue data reduced by the primary processing is accumulated and the deterioration state is captured as a change in eigenvalue.

  The storage unit 13 is composed of, for example, a rewritable nonvolatile memory or volatile memory, and stores the measurement value 131 and the waveform analysis result 132.

  The communication unit 14 is a wired or wireless communication device, and transmits the waveform analysis result 132 stored in the storage unit 13 via, for example, the LAN 31 to an external computer or communication device.

  On the other hand, as illustrated in FIG. 5, the PC 2 includes an input unit 21, a processing unit 22, an output unit 23, and a storage unit 24. The input unit 21 receives the waveform analysis result transmitted from the communication unit 14 of the slave unit 1 via another computer such as a communication line, a communication device, or the server 39, and receives the received waveform analysis result as the processing unit 22. Is stored in the storage unit 24 as a waveform analysis result 242. However, the input unit 21 is configured to connect a detachable storage medium and read the waveform analysis result from the storage medium, or to directly connect the slave unit 1 wirelessly or by wire to read the waveform analysis result. Also good.

  The processing unit 22 includes a change rate calculation unit 221, a determination unit 222, and a determination result output unit 223. The change rate calculation unit 221 first refers to the waveform analysis result 242 and the reference value 241 stored in the storage unit 24. Here, the reference value 241 includes a natural frequency corresponding to a predetermined order, a vibration amplification factor (mode value) corresponding to a predetermined order, and a predetermined order when the structure to be diagnosed is newly constructed (or a fixed reference time). Data corresponding to one or a plurality of structural units corresponding to each sub unit 1. Hereinafter, when the reference value of the natural frequency, the reference value of the vibration amplification factor, and the reference value of the value corresponding to the damping property are collectively expressed, they are simply referred to as the reference value 241, and when expressed individually, the natural frequency reference value 241, This is referred to as a vibration amplification factor reference value 241 or a reference value 241 corresponding to a damping property. The reference value 241 can be set based on a calculated value at the time of design, a value measured at the time of completion, a value that takes into account a secular change, etc. after a certain period after completion.

  Next, the change rate calculation unit 221 is based on data such as a frequency analysis result included in the waveform analysis result 242 stored in the storage unit 24, and a plurality of slave units 1 installed in the structure. As a target, the natural frequency of the structure is obtained for a predetermined order, and the vibration amplification factor of the structure is obtained for a predetermined order. However, when the natural frequency or the vibration amplification factor is calculated by the sub unit 1, the change rate calculation unit 221 can acquire those values from the waveform analysis result 242. In addition, when each natural frequency of each order based on the vibration waveform measured by the plurality of slave units 1 installed in one structure at the same measurement opportunity is different, the level of the frequency component is the highest in frequency analysis, for example. Natural frequencies based on large data can be employed. Further, the change rate calculation unit 221 acquires a value corresponding to the attenuation of the structure calculated in each slave unit 1 from the waveform analysis result 242. The vibration amplification factor is a ratio value between vibration peak values between two or more different points (between layers) in the structure, for example, between vibration peak values of the swinging part in the structure based on the fixed part. The ratio value. This vibration amplification factor is a value corresponding to the ratio of the vibration amplitude at each point of the vibration eigenmode (or vibration mode). Note that the vibration eigenmode is a vibration mode that indicates, for example, the distribution of vibration amplitude at each point (each mass point or the installation point of the vibration sensor) of the system that vibrates simply at the natural frequency, and how the vibration appears in the structure. Represents.

  Next, the change rate calculation unit 221 compares the natural frequency of each order based on the waveform analysis result 242 with the reference value 241 of the natural frequency for each order, and the change rate from the reference value 241 of the natural frequency. Is calculated. Further, the change rate calculation unit 221 compares the vibration amplification factor of each order based on the waveform analysis result 242 with the reference value 241 of the vibration amplification factor for each order, and calculates the change rate from the reference value 241 of the vibration amplification factor. calculate. Furthermore, the change rate calculation unit 221 compares the value corresponding to the attenuation of the structure based on the waveform analysis result 242 with the reference value 241 of the value corresponding to the attenuation for each order, and sets the value corresponding to the attenuation. The rate of change from the reference value 241 is calculated.

  Then, the determination unit 222 compares the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit 221 with a predetermined determination value 244 stored in the storage unit 24. The degree of deterioration of the structure is determined. Alternatively, the determination unit 222 uses the change rate of the natural frequency calculated by the change rate calculation unit 221, the change rate of the vibration amplification factor, and the change rate of the value corresponding to the attenuation, and a predetermined value stored in the storage unit 24. By comparing with the determination value 244, the degree of deterioration of the structure is determined. Here, the determination value 244 is a reference value to be compared with each change rate calculated by the change rate calculation unit 221, and is prepared for one or more stages for each change rate. The determination value 244 includes a plurality of determination values to be compared with each change rate and information indicating the content of the determination corresponding to each determination value. The determination value 244 corresponds to, for example, information that the change rate calculated by the change rate calculation unit 221 is abnormal when the change rate is larger than a certain determination value 244 or normal when the change rate is smaller than a certain determination value 244. It is composed.

  The determination result output unit 223 stores the determination result by the determination unit 222 as a determination result 243 in the storage unit 24 in a predetermined format, for example, in units of structures, and outputs it from the output unit 23 in a predetermined format, for example, in units of structures. The output unit 23 includes an image display device, a printing device, a communication device, and the like, and outputs the determination result by the determination unit 222 in a predetermined format, for example, in units of structures in response to an instruction from the determination result output unit 223.

  Here, an example of the change rate calculation method by the change rate calculation unit 221 will be described in detail. In this example, evaluation formulas for evaluating the relationship between a reference value (initial value, etc.) and a subsequent measurement value are (1) natural period, (2) vibration amplification factor (mode value), and (3) attenuation. The value according to the sex is set as shown below. The change rate calculation unit 221 calculates the period change rate (α), the vibration amplification rate change rate (mode amplitude change rate) (β), and the damping ratio change rate (h) using each evaluation formula. Each change rate becomes an evaluation index (a value to be compared with the determination value 244) of the determination in the determination unit 222.

(1) For the change of the natural period, the rate of change (αni) of the n-th measurement natural period (Tni) with respect to the natural period (Toi) of the reference value is used as an evaluation index. In this case, the evaluation formula can be as follows.

  Here, n represents the number of times of measurement (n-th time) that satisfies the determination condition in the determination unit 121 of the child device 1, and i represents the order of the natural vibration. Tni is the nth i-th natural period, αni is the rate of change (evaluation index) of the reference value of the n-th i-th natural period with respect to the i-th natural period, and Toi is the reference value (initial value o (first time)). I-th natural period.

(2) Regarding the change of the vibration amplification factor, the change rate (βnir) of the vibration amplification factor (Xnir) of the nth measurement with respect to the vibration amplification factor (Xair) of the reference value is used as an evaluation index. Since this vibration amplification factor is determined by the distributed coupled system of mass and rigidity of each floor, if any floor is damaged, the mode amplitude of that floor changes.

  Here, the rate of change (βnir) is an evaluation index. Xnir is the n-th order i-th order vibration amplification factor, βnir is the change rate (evaluation index) of the n-th i-th order r-th vibration amplification factor, and Xair is the i-th order r of the reference value (initial value o (first time)). This is the vibration amplification factor of the floor.

  (3) For the change of the value corresponding to the attenuation, for example, the rate of change (hni) of the attenuation ratio is used as the evaluation index. When designing, earthquake response analysis is performed assuming the damping ratio (h = C / Cc) based on the type of structure such as RC (steel reinforced), steel frame, and wooden, so an approximate damping ratio can be obtained in advance. . Here, C is a viscous damping coefficient, and Cc is a critical damping coefficient. In detail, there is a theory of evaluation using an autocorrelation analysis method of an observed waveform. Therefore, it is possible to determine a reference value (initial value) based on this. As for an example of the change in the value corresponding to the attenuation, the rate of change (hni) of the attenuation ratio (Hni) of the nth measurement with respect to the attenuation ratio (Hoi) of the reference value is used as an evaluation index.

  Here, the rate of change (hni) is an evaluation index. Hni is the n-th i-th order attenuation ratio, hni is the change rate (evaluation index) of the n-th i-th order attenuation ratio, and Hoi is the i-th order attenuation ratio of the reference value (initial value o (first time)).

  As described above, the determination unit 222 determines the degree of deterioration of the structure based on the natural frequency change rate and the vibration amplification rate change rate calculated by the change rate calculation unit 221. Alternatively, the determination unit 222 determines the degree of deterioration of the structure based on the change rate of the natural frequency calculated by the change rate calculation unit 221, the change rate of the vibration amplification factor, and the change rate of the value corresponding to the attenuation. To do. At the time of determination, the determination unit 222 calls the determination value 244 stored in the storage unit 24, and determines the degree of deterioration by comparing the determination value 244 with each rate of change. For example, the determination unit 222 can use a diagnosis result determined to have the highest degree of deterioration based on each change rate as the diagnosis result of the structure.

  When the above-described change rate (αni, βnir, hni) calculation method is used, the determination unit 222 determines whether the change rate (αni, βnir, hni) is within an allowable range, thereby determining the deterioration diagnosis result. To decide. Whether the rate of change is within the allowable range depends on the type of structure (building, soundproof wall, equipment, etc.), structure type (RC structure, S structure (steel structure), lightweight steel structure, wooden structure, etc.) , Different depending on the height (high-rise, middle-low-rise, one-story) etc., it is necessary to define each. For example, in the case of an RC 10-story building, from the experimental results, the rate of change in natural frequency is roughly: αni> 0.9 (normal), 0.9> αni> 0.8 (caution, detailed examination of strength), 0 .8> αni (contact the design management organization).

  Here, referring to FIGS. 6 to 9, in this embodiment, the deterioration of the structure based on the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit 221 by the determination unit 222. The effect which the structure which determines the degree of will show is demonstrated. 6-9 is a figure showing the change of the natural frequency or the change of vibration mode shape measured in the destructive vibration experiment of the full-scale building by the large-sized shaking table. In this vibration experiment, a 50 Gal earthquake wave was input immediately after a building was vibrated based on a predetermined seismic wave whose level was changed to 10%, 25%, 50%, or 100% in an RC 10-story building. The acceleration in the X and Y directions was measured with an acceleration sensor arranged every other floor from the first floor to the R floor. Then, frequency analysis was performed from the measured time calendar data, and the natural frequency and the vibration mode shape were calculated from the known theory from the analysis result.

  6 and 7, the horizontal axis indicates the relationship between the initial value, 10%, 25%, 50%, and 100% excitation, and the vertical axis indicates the change in the natural frequency. 6 shows changes in the primary to tertiary natural frequencies in the X direction, and FIG. 7 shows changes in the primary to fourth natural frequencies in the Y direction. As shown in FIGS. 6 and 7, 1) When the seismic force increases, the primary, secondary and tertiary natural frequencies decrease in both the XY directions. 2) Compared to the rate of change after the 10% and 25% earthquakes, if the rate exceeds about 50%, the rate of change tends to be large.

  8 and 9 show the initial values and the primary and secondary eigenmode shapes after 25%, 50%, and 100% excitation. FIG. 8 shows primary and secondary eigenmode shapes in the X direction, and FIG. 9 shows primary and secondary eigenmode shapes in the Y direction. 8 and 9 show the vibration amplification factors of the primary and secondary natural vibrations based on the result of frequency analysis, with the mode amplitude of the degradation process being based on the R-order amplitude (= 1.0). As shown in FIG. 8 and FIG. 9, it can be seen that the mode changes as the seismic force increases as compared with the initial value (healthy state) mode. 2) When viewed roughly, the seismic force changed slightly from 10% to 25% with respect to the initial value. It was a situation where fine cracks were progressing visually. 3) It has changed considerably at 50%. By visual inspection, cracks in the beam-column joints of the upper floors and the seismic walls were in full swing. 4) The mode is further greatly changed at 100%. By visual observation, it was observed that a part of the concrete near the same part was peeled off and dropped.

  According to the characteristics shown in FIGS. 6 to 9, the natural frequency shows a large change after 50% vibration, but no significant change is observed after the vibration of 25% or less. On the other hand, the natural mode shape (vibration amplification factor) may show the same change as after 50% vibration even after 25% vibration. Therefore, according to the present embodiment, evaluation according to the vibration change rate (mode value) can be performed. Therefore, the deterioration diagnosis based only on the change of the natural frequency is diagnosed by appropriately setting the reference value. It can be seen that a relatively small degradation that cannot be diagnosed can be diagnosed. That is, according to the present embodiment, it is possible to diagnose the deterioration of the structure in a wide range of the degree of deterioration as compared with the case of diagnosing based only on the change of the natural frequency (or the natural period). .

  Next, an outline of an operation example of the slave unit 1 and an operation example of the PC 2 shown in FIG. 1 will be described with reference to FIGS. FIG. 10 is a flowchart showing the flow of processing when the handset 1 measures the vibration waveform. The process shown in FIG. 10 is repeatedly executed at a predetermined time interval, for example. When the process shown in FIG. 10 starts, first, the determination unit 121 inputs an output signal of the vibration sensor 11 and acquires the vibration level detected by the vibration sensor 11 (step S101). Next, the determination unit 121 compares the vibration level acquired in step S101 with a predetermined measurement start threshold value, and determines whether or not the vibration level is greater than the measurement start threshold value (step S102). If the determination unit 121 determines in step S102 that the vibration level is not greater than the measurement start threshold (if “NO” in step S102), the determination unit 121 ends the process. On the other hand, when determining that the vibration level is larger than the measurement start threshold value in Step S102 (in the case of “YES” in Step S102), the determination unit 121 acquires the vibration level at a predetermined sampling period (Step S103). Next, the determination unit 121 stores the vibration level acquired in step S103 as the measurement value 131 in the storage unit 13 so as to correspond to the sampling time (step S104).

  Next, the determination unit 121 determines whether or not a predetermined time has elapsed (step S105). When the determination unit 121 determines that the predetermined time has not elapsed (in the case of “NO” in step S105), the determination unit 121 repeatedly executes the processes in steps S103 to S105. On the other hand, when determining that the predetermined time has elapsed in step S102 (in the case of “YES” in step S105), the determining unit 121 acquires the vibration level at predetermined time intervals (step S106). Next, the determination unit 121 compares the vibration level acquired in step S106 with a predetermined measurement end threshold value, and determines whether the vibration level is smaller than the measurement end threshold value (step S107). If the determination unit 121 determines in step S107 that the vibration level is not smaller than the measurement end threshold value (in the case of “NO” in step S107), the determination unit 121 repeatedly executes the processes in steps S106 to S107.

  When the determination unit 121 determines in step S107 that the vibration level is smaller than the measurement end threshold value (in the case of “YES” in step S107), the waveform analysis unit 122 measures the measurement value 131 for a predetermined time stored in the storage unit 13. Is subjected to frequency analysis processing (step S108). Next, the waveform analysis unit 122 stores the frequency analysis result in step S108 in the storage unit 13 as the waveform analysis result 132 (step S109). Next, the waveform analysis unit 122 calculates a value corresponding to the attenuation based on the measurement value 131 for a predetermined time stored in the storage unit 13 (step S110). Next, the waveform analysis unit 122 stores the calculation result of the value according to the attenuation in step S110 as the waveform analysis result 132 in the storage unit 13 (step S111).

  When the slave unit 1 detects a vibration level exceeding the measurement start threshold value by executing the above processing, the slave unit 1 captures a vibration waveform at a predetermined sampling period for a predetermined time, and stores the captured result as a measured value 131 in the storage unit 13. A frequency analysis process based on the stored vibration waveform and a process for calculating a value corresponding to the attenuation are executed while storing the data. And the subunit | mobile_unit 1 memorize | stores the calculation result of the value according to the frequency analysis processing result and attenuation property in the memory | storage part 13 as the waveform analysis result 132. FIG. At this time, the measured value 131 can be deleted (or overwritten) after the frequency analysis in step S108 and the calculation of the value corresponding to the attenuation in step S110 are completed.

  Next, the flow of processing when the slave unit 1 transmits the waveform analysis result 132 stored in the storage unit 13 from the communication unit 14 will be described with reference to FIG. The process shown in FIG. 11 is repeatedly executed at a predetermined time interval, for example. First, in the subunit | mobile_unit 1, the process part 12 determines whether predetermined | prescribed transmission conditions were satisfied (step S201). For example, when the untransmitted waveform analysis result 132 is stored in the storage unit 13, the predetermined transmission condition is that the untransmitted waveform analysis result 132 is stored in the storage unit 13 and the data server 32 or For example, when the waveform analysis result 132 can be transmitted to the server in the cloud 36, or when a transmission request is received from the data server 32 or the server in the cloud 36. When it is determined in step S201 that the predetermined transmission condition is satisfied (in the case of “YES” in step S201), the processing unit 12 controls the communication unit 14 and stores the predetermined transmission destination in the storage unit 13. The waveform analysis result 132 is transmitted (step S202). Here, the predetermined transmission destination is the data server 32, the server in the cloud 36, the server 39, or the like. At that time, the transmitted waveform analysis result 132 is attached with information such as the identification code of the slave unit 1 and the measurement time of the vibration waveform.

  Next, the flow of processing when the PC 2 diagnoses the deterioration of the structure based on the waveform analysis result 132 transmitted from the slave unit 1 will be described with reference to FIG. The process shown in FIG. 12 is executed when the server 39 receives a new waveform analysis result 132 transmitted from the slave unit 1, for example. First, the input unit 21 inputs the new waveform analysis result 132 received from the slave unit 1 from the server 39 and stores it as the waveform analysis result 242 in the storage unit 24. Further, the change rate calculation unit 221 further selects the diagnosis target. The waveform analysis result 242 stored in the storage unit 24 is read into a storage area such as a working memory (not shown) in the processing unit 22 (step S301). Next, the change rate calculation unit 221 reads the reference value 241 of each order corresponding to the child device 1 stored in the storage unit 24 into a storage area such as a working memory (not shown) in the processing unit 22 (step S302). ). Next, the change rate calculation unit 221 reads the determination value 244 of each order corresponding to the child device 1 stored in the storage unit 24 into a storage area such as a working memory (not shown) in the processing unit 22 (step S303). ).

  Next, the change rate calculation unit 221 calculates a natural period of a predetermined order based on the waveform analysis result 242 read in step S301 (or acquires a natural period of a predetermined order from the waveform analysis result 242) (step S304). Next, the change rate calculation unit 221 calculates the change rate of the natural period of each order based on the natural period of each order calculated in step S304 and the reference value 241 of the natural period of each order read in step S302. (Step S305). Next, the determination unit 222 compares the change rate of the natural period calculated in step S305 with the determination value 244 read in step S303 for each order (step S306).

  Next, the change rate calculation unit 221 calculates a vibration amplification factor of a predetermined order based on the waveform analysis result 242 read in step S301 (or acquires a vibration amplification factor of a predetermined order from the waveform analysis result 242) (step S307). ). Next, the rate of change of the vibration amplification factor of each order based on the vibration amplification factor of each order calculated in step S307 and the reference value 241 of the vibration amplification factor of each order read in step S302. Is calculated (step S308). Next, the determination unit 222 compares the change rate of the vibration amplification factor calculated in step S308 with the determination value 244 read in step S303 for each order (step S309).

  Next, the change rate calculation unit 221 uses a value corresponding to the attenuation of each order included in the waveform analysis result 242 read in step S301 and a reference of a value corresponding to the attenuation of each order read in step S302. Based on the value 241, the rate of change of the value corresponding to the attenuation is calculated (step S310). Next, the determination unit 222 compares the change rate of the value calculated in step S310 with the determination value 244 read in step S303 for each order (step S311).

  Next, the determination unit 222 stores the comparison results obtained in steps S306, S309, and S311 as the determination results 243 in the storage unit 24 (step S312). Next, the determination result output unit 223 outputs the stored determination result 243 from the output unit 23 in a predetermined format in units of structures (step S313).

  As described above, in the present embodiment, the input unit 21 measures the vibration waveform of the structure with the plurality of slave units 1 and performs a predetermined waveform analysis on the measured vibration waveform with the plurality of slave units 1. The processed waveform analysis result 132 is input. Further, the input unit 21 stores the input waveform analysis result 132 in the storage unit 24 as the waveform analysis result 242. The storage unit 24 stores a reference value 241 for the natural frequency of the structure and a reference value 241 for the vibration amplification factor of the structure. The rate-of-change calculating unit 221 calculates the rate of change of the natural frequency of the structure based on the waveform analysis result 242 with respect to the reference value 241 of the natural frequency, and the vibration amplification factor of the structure based on the waveform analysis result 242 is calculated. The change rate of the vibration amplification factor with respect to the reference value 241 is calculated. Then, the determination unit 222 determines the degree of deterioration of the structure based on the change rate of the natural frequency and the change rate of the dynamic amplification factor calculated by the change rate calculation unit 221. According to this configuration, the deterioration of the structure can be diagnosed in a wide range of the degree of deterioration.

  In the present embodiment, the input unit 21 further inputs a value corresponding to the attenuation of the structure calculated by the plurality of slave units 1 based on the vibration waveform as the waveform analysis result 132 and stores it as the waveform analysis result 242. To do. Further, the storage unit 24 further stores a reference value 241 of a value corresponding to the attenuation of the structure. Further, the change rate calculation unit 221 further calculates a change rate with respect to a reference value of a value corresponding to the attenuation of the structure based on the waveform analysis result 242 and a value corresponding to the attenuation. Further, the determination unit 222 determines the degree of deterioration of the structure based on the change rate of the natural frequency calculated by the change rate calculation unit 221, the change rate of the vibration amplification factor, and the change rate of the value corresponding to the attenuation. To do. According to this configuration, it can be expected to diagnose the degree of deterioration in more detail.

  Further, in the present embodiment, when the plurality of slave units 1 detect a vibration waveform of a predetermined level or higher, the vibration waveform of the structure is measured for a predetermined time, and the predetermined vibration waveform is measured with respect to the measured vibration waveform. The waveform analysis result 132 subjected to the waveform analysis processing is stored in the storage unit 13 or the like (predetermined storage device). According to this structure, the structure of the subunit | mobile_unit 1 can be simplified, such as reduction of a storage capacity or a communication capacity.

  Moreover, in this embodiment, the some subunit | mobile_unit 1 can be limited to a total of 2 units | sets, one unit installed in the fixed part of the structure, and one unit installed in the shaking part of the structure. In this case, the deterioration diagnosis system 100 can be simplified.

  Users of structures that have been in service for many years usually feel uneasy about safety every time an earthquake or strong wind occurs. It is a common desire of residents and users to keep track of the aging of the structure over a long period of time in a simple manner and to understand its deterioration. The conventional seismic diagnosis and damage assessment system, etc., is a comparative evaluation between the maximum shake value and the seismic design value when a major earthquake is encountered several years after in-service. For example, it is possible to easily realize dynamic eigenvalue observation that can evaluate the progress of aging deterioration from the viewpoint of frequently experiencing vibration after construction and causing cumulative damage of vibration energy stored in the construction part.

  As an application example of the present embodiment, for example, a diagnosis result can be output and reported to an apartment resident in an appropriate manner each time after a large earthquake. Even in high-rise apartments in the bay area of Tokyo, foreign residents who have little experience of earthquakes will be worried about every earthquake, which will help convey the safety of the building. In addition, there are many cases where there is a sense of safety insecurity for large earthquakes throughout the structure. If it can be implemented by a simple and inexpensive method, the necessary seismic retrofit will be planned in advance in view of its deterioration. In this theoretical construction, according to the present embodiment, by focusing on the eigenvalue characteristics representing the original performance of the structure, it is possible to grasp the degree of progress of deterioration as the degree of fluctuation of the eigenvalue and to evaluate safety and security.

  Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a block diagram illustrating a configuration example of a deterioration diagnosis system 100a according to another embodiment of the present invention. In FIG. 13, the same or corresponding components as those shown in FIG. FIG. 14 is a schematic diagram showing an example of arrangement of the child unit 1 shown in FIG. 13 on the structure.

  A deterioration diagnosis system 100a shown in FIG. 13 includes a plurality of slave units 1 and PCs 2, an in-vehicle PC 4, and a storage medium 5. In this case, the subunit | mobile_unit 1 performs radio | wireless communication between vehicle-mounted PC4, and transmits the waveform analysis result 132 shown in FIG. The in-vehicle PC 4 is a PC mounted on the automobile, receives the waveform analysis result 132 from the slave unit 1, and stores the received waveform analysis result 132 in the storage medium 5. The storage medium 5 is a detachable and rewritable nonvolatile storage device such as a memory card or a general-purpose bus specification memory. The PC 2 connects the storage medium 5 to the input unit 21 shown in FIG. 5, inputs the waveform analysis result 132 stored in the storage medium 5, and stores it in the storage unit 24 as the waveform analysis result 242. Other configurations and operations of the slave unit 1 and the PC 2 are the same as those of the above-described embodiment described with reference to FIGS.

  The deterioration diagnosis system 100a shown in FIG. 13 has a configuration suitable for performing deterioration diagnosis by installing the child unit 1 on a structure such as a sound barrier of the elevated road 6 as shown in FIG. In this case, one slave unit 1 s is installed on the road wall 62 on the bridge pier 61 of the elevated road 6, and another slave unit 1 t is installed above the soundproof wall 63. The subunit | mobile_unit 1s and the subunit | mobile_unit 1t respond | correspond to the subunit | mobile_unit 1 shown in FIG. 1 and FIG. Further, the collection of the waveform analysis results 132 from the slave unit 1s and the slave unit 1t can be performed by wireless connection using the in-vehicle PC 4 mounted on the automobile 8.

  Also in this embodiment, the same effect as the above-described embodiment described with reference to FIG. 1 and the like can be obtained.

  The embodiment of the present invention is not limited to the above. For example, after an earthquake, a typhoon, etc., it is possible to adopt or use a method of going to the target building etc. and manually collecting data. In this case, for example, after recording a large vibration, a technician goes to the site and collects data. Although it is a primitive method, depending on the target structure, it may contribute to a reduction in system cost and may be easy to handle. In each of the above embodiments, any of the plurality of determination units 121 determines the start of recording of the vibration waveform for the plurality of slave units 1 installed in the same structure or in a certain region of the same structure. In some cases, recording of the vibration waveform may be started in all the slave units 1. Moreover, you may make it synchronize the measurement of the vibration waveform in each subunit | mobile_unit 1 by providing the timepiece function which can set time between each subunit | mobile_unit 1 in each subunit | mobile_unit 1. FIG.

100, 100a Deterioration diagnosis system 1, 1a, 1b, 1g, 1h, 1s, 1t Slave unit 11 Vibration sensor 12 Processing unit 121 Determination unit 122 Waveform analysis unit 13 Storage unit 132 Waveform analysis result 2 PC
22 processing unit 221 change rate calculation unit 222 determination unit 223 determination result output unit 24 storage unit 241 reference value 242 waveform analysis result 243 determination result 244 determination value 4 vehicle-mounted PC
5 storage media

Claims (6)

An input unit that measures a vibration waveform of a structure with a plurality of slave units, and inputs a waveform analysis result obtained by performing a predetermined waveform analysis process on the vibration waveforms measured by the plurality of slave units;
A storage unit for storing a reference value of the natural frequency of the structure and a reference value of the vibration amplification factor of the structure;
The rate of change of the natural frequency of the structure based on the waveform analysis result with respect to the reference value of the natural frequency is calculated, and the reference value of the vibration gain of the structure based on the waveform analysis result A rate of change calculation unit for calculating a rate of change with respect to
A deterioration diagnosis device comprising: a determination unit that determines a degree of deterioration of the structure based on the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit. The input unit further inputs, as the waveform analysis result, a value corresponding to the attenuation of the structure calculated by the plurality of slave units based on the vibration waveform,
The storage unit further stores a reference value of a value according to the attenuation of the structure,
The change rate calculation unit further calculates a change rate with respect to a reference value of a value corresponding to the attenuation value of the structure and a value corresponding to the attenuation property based on the waveform analysis result,
The determination unit determines the degree of deterioration of the structure based on the change rate of the natural frequency calculated by the change rate calculation unit, the change rate of the vibration amplification factor, and the change rate of a value corresponding to the damping property. The deterioration diagnosis device according to claim 1. When the plurality of slave units detect a vibration waveform of a predetermined level or higher, the vibration waveform of the structure is measured for a predetermined time, and the predetermined waveform analysis processing is performed on the measured vibration waveform. The deterioration diagnosis apparatus according to claim 1, wherein the waveform analysis result is stored in the predetermined storage device. 4. The plurality of slave units is a total of two units, one unit installed at a fixed portion of the structure and one unit installed at a swinging unit of the structure. 5. Deterioration diagnosis apparatus according to 1. An input unit that measures a vibration waveform of a structure with a plurality of slave units, and inputs a waveform analysis result obtained by performing a predetermined waveform analysis process on the vibration waveforms measured by the plurality of slave units;
A storage unit for storing a reference value of the natural frequency of the structure and a reference value of the vibration amplification factor of the structure;
The rate of change of the natural frequency of the structure based on the waveform analysis result with respect to the reference value of the natural frequency is calculated, and the reference value of the vibration gain of the structure based on the waveform analysis result A rate of change calculation unit for calculating the rate of change with respect to
A deterioration diagnosis method in which a determination unit determines a degree of deterioration of the structure based on a change rate of the natural frequency and a change rate of the vibration amplification factor calculated by the change rate calculation unit. A plurality of slave units for measuring a vibration waveform of the structure and storing a result of performing a predetermined waveform analysis process on the measured vibration waveform in a predetermined storage device as a waveform analysis result;
An input unit for inputting the waveform analysis results stored in the plurality of slave units;
A storage unit for storing a reference value of the natural frequency of the structure and a reference value of the vibration amplification factor of the structure;
The rate of change of the natural frequency of the structure based on the waveform analysis result with respect to the reference value of the natural frequency is calculated, and the reference value of the vibration gain of the structure based on the waveform analysis result A rate of change calculation unit for calculating a rate of change with respect to
A deterioration diagnosis system comprising: a determination unit that determines a degree of deterioration of the structure based on the change rate of the natural frequency and the change rate of the vibration amplification factor calculated by the change rate calculation unit.

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