JP2017194331A - Damage detection system, damage detection device, damage detection method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damage detection system that can suppress erroneous determination of presence/absence of damage due to noise and an abnormal value in damage detection of a structure, and a damage detection device, a damage detection method, a program and the like.SOLUTION: A damage detection system 100 comprises: a physical quantity sensor 110 that detects physical quantity information corresponding to an angle of inclination of a structure; and a processing part 120 that performs averaging processing of the physical quantity information and obtains inclination angle information of the structure. The processing part 120 performs damage determination processing for determining presence/absence of damage of the structure on the basis of the inclination angle information or a temporal change of the inclination angle information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a damage detection system, a damage detection apparatus, a damage detection method, a program, and the like.

  In recent years, there has been a growing desire to quantitatively grasp the state of damage to structures such as buildings when disasters such as earthquakes occur. Thus, as a technique used for grasping the state of damage of a structure, there is a conventional technique described in Patent Document 1, for example. In Patent Document 1, the absolute value of an output signal of a sensor installed in a structure is integrated within a predetermined time to calculate an amplitude absolute value sum, and whether the structure is damaged or not is calculated based on the calculated amplitude absolute value sum. A damage detection device for determining is disclosed.

Japanese Patent Laid-Open No. 2008-3043

  In the invention disclosed in Patent Document 1, a cumulative error due to noise occurs, and noise removal means and complicated data processing for improving accuracy are required, and an expensive device or a large amount of power is required.

  According to some aspects of the present invention, there are provided a damage detection system, a damage detection device, a damage detection method, a program, and the like that can suppress erroneous determination of the presence or absence of damage due to noise or an abnormal value in damage detection of a structure. can do.

  One aspect of the present invention includes a physical quantity sensor that detects physical quantity information corresponding to an inclination angle of a structure, and a processing unit that performs an averaging process on the physical quantity information to obtain the inclination angle information of the structure. The processing unit relates to a damage detection system that performs a damage determination process for determining whether or not the structure is damaged based on the tilt angle information or a time change of the tilt angle information.

  In one embodiment of the present invention, the physical quantity information detected by the physical quantity sensor is averaged to obtain the tilt angle information of the structure, and the damage to the structure is determined based on the tilt angle information or the time change of the tilt angle information. Damage determination processing is performed to determine whether or not there is any damage. Therefore, in the damage detection of the structure, it is possible to suppress erroneous determination of the presence or absence of damage due to noise or abnormal values.

  In one aspect of the present invention, the processing unit compares the inclination angle indicated by the inclination angle information with a given threshold value, the difference value between the inclination angles at at least two times, and the inclination angle. The damage determination process may be performed based on at least one information of the time change speed.

  Thereby, for example, by combining a plurality of damage determination methods, it is possible to determine the presence or absence of damage in the structure regardless of the difference in the change speed of the inclination angle of the structure.

  In the aspect of the invention, the processing unit may be the low-pass filter process of the physical quantity information or the average value of the physical quantities indicated by the physical quantity information output from the physical quantity sensor in a given period as the averaging process. You may perform the process which calculates | requires.

  Thereby, it is possible to remove information representing instantaneous vibration that becomes noise or an abnormal value in the damage determination process from the physical quantity information detected by the physical quantity sensor.

  Moreover, in one aspect of the present invention, it includes a plurality of physical quantity sensors that detect the physical quantity information corresponding to the inclination angle of the structure, and the processing unit is a second physical quantity sensor of the plurality of physical quantity sensors. The second physical quantity information is obtained from the second physical quantity information, second inclination angle information is obtained based on the obtained second physical quantity information, and the inclination obtained using the physical quantity sensor among the plurality of physical quantity sensors. The damage determination process may be performed based on angle information and the second tilt angle information.

  Accordingly, it is possible to determine whether or not the structure is damaged based on physical quantity information obtained from at least two physical quantity sensors.

  In the aspect of the invention, the processing unit may perform a damage position specifying process in the structure based on the tilt angle information and the result of the damage determination process.

  Accordingly, it is possible to estimate a location where damage is generated in the structure.

  In one aspect of the present invention, the processing unit acquires third physical quantity information from a third physical quantity sensor among the plurality of physical quantity sensors, and based on the acquired third physical quantity information, 3 may be obtained, and the damage determination process may be performed based on the tilt angle information, the second tilt angle information, and the third tilt angle information.

  Accordingly, it is possible to determine whether or not the structure is damaged based on physical quantity information obtained from at least three physical quantity sensors.

  In one embodiment of the present invention, the structure is provided between a first fixed point and a second fixed point, and the physical quantity sensor is provided on the first fixed point side of the structure. The second physical quantity sensor may be provided on the second fixed point side of the structure.

  This makes it possible to detect the presence or absence of damage in the region between the two physical quantity sensors.

  In the aspect of the invention, the physical quantity sensor is provided at a center of the structure, the second physical quantity sensor is provided on one end side of the structure, and the processing unit is connected to the physical quantity sensor. Difference information between the obtained first physical quantity information and the second physical quantity information obtained from the second physical quantity sensor may be obtained, and the damage determination process may be performed based on the difference information.

  Accordingly, it is possible to perform a damage determination process on the structure based on the inclination angle near the center of the structure and the inclination angle on one end side of the structure.

  In the aspect of the invention, the physical quantity sensor is provided in the structure at a position adjacent to the second physical quantity sensor, and the processing unit is first physical quantity information acquired from the physical quantity sensor. Difference information with the second physical quantity information acquired from the second physical quantity sensor may be obtained, and the damage determination process may be performed based on the difference information.

  Thereby, it becomes possible to specify which area is damaged or not damaged among a plurality of areas of the structure divided by the installation positions of at least two physical quantity sensors.

  In the aspect of the invention, the processing unit obtains the tilt angle information and the vibration information of the structure based on the physical quantity information, and the damage based on the tilt angle information and the vibration information. A determination process may be performed.

  This makes it possible to perform damage determination processing and the like in consideration of both instantaneous vibration applied to the structure and medium to long-term inclination changes of the structure.

  In the aspect of the invention, the processing unit may perform a high-pass filter process on the physical quantity information to obtain the vibration information, and perform a low-pass filter process on the physical quantity information to perform the tilt angle information. You may ask for.

  This makes it possible to divide the physical quantity information into vibration information representing an instantaneous inclination change and inclination angle information representing a medium to long-term inclination change.

  In one aspect of the present invention, the storage unit includes the storage unit that stores the physical quantity information. When the processing unit determines that the structure is damaged based on the tilt angle information, the storage unit The vibration information may be analyzed based on the physical quantity information stored in

  This makes it possible to specify the cause of the damage to the structure.

  In one aspect of the present invention, the processing unit determines whether the vibration represented by the vibration information satisfies a given condition, and determines that the given condition is satisfied. The damage determination process may be performed based on corner information.

  This makes it possible to reduce the processing load when it is not necessary to perform damage determination processing.

  Further, according to one aspect of the present invention, a notification unit that performs a notification process based on a result of the damage determination process may be included.

  This makes it possible to notify the user of the result of the damage determination process.

  According to another aspect of the present invention, a plurality of physical quantity sensors that detect physical quantity information corresponding to a tilt angle of a structure, and a plurality of pieces of physical quantity information acquired from the plurality of physical quantity sensors are obtained, and the difference is calculated. The present invention relates to a damage detection system including a processing unit that performs a damage determination process for determining whether or not the structure is damaged based on information.

  In another aspect of the present invention, the physical quantity information corresponding to the inclination angle of the structure is obtained from a physical quantity sensor provided in the structure, the physical quantity information is averaged, and the inclination of the structure is obtained. A processing unit that obtains angle information, and a storage unit that stores at least the physical quantity information, and the processing unit determines whether the structure is damaged based on the tilt angle information or a change in the tilt angle information over time. The present invention relates to a damage detection apparatus that performs a damage determination process for determining the damage.

  In another aspect of the present invention, the physical quantity information corresponding to the inclination angle of the structure is obtained from a physical quantity sensor provided in the structure, and the physical quantity information is averaged, and the structure is obtained. Related to a damage detection method including: obtaining inclination angle information of the structure; and performing damage determination processing for determining presence or absence of damage to the structure based on the inclination angle information or a time change of the inclination angle information. To do.

  Another aspect of the present invention relates to a program that causes a computer to function as each of the above-described units.

Explanatory drawing of the system configuration example of this embodiment. Explanatory drawing of the structural example of a physical quantity sensor. Explanatory drawing of the detailed system configuration example of this embodiment. Explanatory drawing of the example of installation of a physical quantity sensor. Explanatory drawing of the example of installation of two physical quantity sensors. Explanatory drawing of the example where damage occurred in a structure. Explanatory drawing of the other example of installation of two physical quantity sensors. Explanatory drawing of the example of installation of three physical quantity sensors. Explanatory drawing of the example of installation of the physical quantity sensor when there is a damage monitoring candidate. Explanatory drawing of the other example of installation of the physical quantity sensor when there exists a monitoring candidate of damage. The flowchart explaining the flow of a process of this embodiment. Explanatory drawing of an inclination angle. Explanatory drawing of the specific process of a damage position. Explanatory drawing of the time series change of the difference value of the inclination angle detected between two physical quantity sensors. The perspective view of a structure. The flowchart explaining the flow of a process of a modification. Explanatory drawing of event generation timing. Explanatory drawing of the system configuration example of 2nd Embodiment.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

1. Damage Detection System A damage detection system 100 according to this embodiment is shown in FIG. As shown in FIG. 1, the damage detection system 100 of the present embodiment includes a physical quantity sensor 110 and a processing unit (processor) 120. The physical quantity sensor 110 detects physical quantity information corresponding to the inclination angle of the structure. And the process part 120 calculates | requires the inclination-angle information of a structure by averaging the physical quantity information. Further, the processing unit 120 performs damage determination processing for determining whether there is damage to the structure based on the tilt angle information or the time change of the tilt angle information. Note that the damage detection system 100 is not limited to the configuration shown in FIG. 1, and various modifications such as omitting some of these components or adding other components are possible.

  Next, the configuration of each part of the damage detection system 100 will be described.

  The physical quantity sensor 110 according to the present embodiment is a sensor that detects at least one of inclination and vibration of a structure. The physical quantity sensor 110 is an acceleration sensor, for example, and includes an acceleration detection element 111 and a detection circuit 112 as shown in FIG. For example, the acceleration detection element 111 is a force detection element using a tuning fork type piezoelectric vibrating piece. The detection circuit 112 detects (extracts) an acceleration signal from the sensor signal from the acceleration detection element 111, performs A / D conversion on the acceleration signal, and uses the data after the A / D conversion as physical quantity information. Output to the processing unit. Since the physical quantity sensor 110 using the piezoelectric vibrating piece can detect a change in force as a change in resonance frequency (oscillation frequency), the acceleration of the structure can be detected from the sensor signal. Further, vibration can be detected from the change in acceleration, and the inclination of the structure can be detected by using gravitational acceleration. However, the physical quantity sensor 110 according to the present embodiment may be a tilt sensor or a vibration sensor having another configuration, or may be a sensor that detects a physical quantity other than the tilt or vibration. For example, an acceleration sensor having a configuration different from the above may be employed as the tilt sensor and the vibration sensor. For example, as another example of the acceleration sensor, there is a capacitance type acceleration sensor that detects a change in capacitance between an electrode provided on a movable portion that moves according to acceleration and a fixed electrode.

  The function of the processing unit 120 is realized by a processor such as a CPU (Central Processing Unit). The processor is not limited to the CPU, and various processors such as a GPU (Graphics Processing Unit) or a DSP (Digital Signal Processor) can be used. The processor may be a hardware circuit based on ASIC (Application Specific Integrated Circuit).

  Here, the structure refers to a building (building) such as a building or a house, or an artificial structure such as a bridge, a highway, a tower, a power pole, or a dam. The structure may be a natural structure such as a mountain, a rock, a river, a tree, a river, or a cliff.

  Next, the inclination angle is an angle representing the inclination of the installation surface (installation position) where the physical quantity sensor 110 is provided, for example. And an installation surface is a surface where the physical quantity sensor 110 is installed among the outer surfaces of the structure. For example, the inclination angle is an inclination of the installation surface from the first timing to the second timing when the physical quantity sensor 110 is installed on the surface of the structure. When the physical quantity sensor 110 is embedded in the structure, the change in the inclination of the physical quantity sensor 110 itself from the first timing to the second timing corresponds to the inclination angle of the structure.

  The physical quantity information is information representing a physical quantity corresponding to the tilt angle. The physical quantity detected by the physical quantity sensor 110 may be the inclination angle (tilt angle) of the structure itself, or may be a physical quantity other than the inclination angle. For example, as described above, when an acceleration sensor is used as the physical quantity sensor 110, the detected physical quantity is the acceleration of the structure (acceleration applied to the acceleration sensor installed in the structure).

  Further, the information indicating the tilt angle described above is referred to as tilt angle information. The tilt angle information is, for example, angle information that represents the tilt angle with a numerical value.

  Inclination angle information is information that is referred to when determining whether or not a structure is damaged. In this case, it is not an instantaneous change in the inclination of the structure, but a change in the structure that has changed as a result of damage to the structure. It is desirable to be able to refer to the tilt angle, or tilt angle that can damage the structure. For example, when the structure is a bridge and a normal vehicle passes over the bridge, the bridge may be instantaneously bent and the inclination angle of the bridge may change while the vehicle is passing. However, this should be considered as temporary noise, not a tilt change that causes damage to the bridge. On the other hand, if an overloaded vehicle passes over the bridge many times over a long period of time, in addition to the short-term inclination change during traffic, the inclination angle of the bridge gradually changes over the long term. There is a case to do. In this case, it can be estimated that the bridge is damaged and the inclination angle of the bridge is changed because the overloaded vehicle has passed many times over a long period of time. Therefore, it is desirable that information indicating such an inclination angle can be referred to in a damage determination process for a structure to be described later.

  Therefore, in the present embodiment, in order to identify a change in the inclination angle of the structure over the medium to long term, the processing unit 120 performs an averaging process on the physical quantity information obtained from the physical quantity sensor 110 to thereby incline the structure. Find corner information. The averaging process is, for example, a low-pass filter process for physical quantity information or a process for obtaining an average value of physical quantities indicated by physical quantity information output from the physical quantity sensor 110 in a given period. The given period is a period longer than the temporary or short-term fluctuation of the inclination angle assumed in the structure to be monitored. For example, the period is sufficiently longer than the period of vibrations generated in the structure (for example, vibrations caused by passing of vehicles, vibrations caused by earthquakes, etc.). That is, the averaging process is an averaging process over a longer period than a temporary change in the tilt angle such as vibration. For example, when the averaging process is realized by the low-pass filter process, the cutoff frequency is set to a frequency lower than the frequency of the temporary or short-term fluctuation of the inclination angle assumed in the structure to be monitored.

  In this way, by performing damage determination processing based on the inclination angle information that indicates changes in the medium-to-long-term inclination angle of the structure, it is possible to suppress misjudgment of presence or absence of damage due to noise or abnormal values in the inclination change of the structure can do. In other words, for example, when a structure shakes greatly for a moment, it is not determined that the structure is damaged immediately. When the inclination angle of the structure is restored, it can be determined that the structure is not damaged. On the other hand, even if the structure does not vibrate very momentarily, it is determined that the structure is damaged when the tilt angle of the structure changes slowly over time. You can also. The time change of the tilt angle information will be described later with a specific example.

  In addition, the tilt angle changed by the damage can be observed even after the damage has occurred. In other words, it is difficult to determine damage after vibration has subsided, but after the event that caused the damage (such as an earthquake) has subsided by using the tilt angle, Even damage can be assessed.

2. Detailed Configuration of Damage Detection System Next, a detailed configuration example of the damage detection system 100 of the present embodiment will be described with reference to FIG. As shown in FIG. 3, the damage detection system 100 of the present embodiment includes a plurality of physical quantity sensors, a processing unit (processor) 120, a storage unit (memory) 130 that stores physical quantity information, and a result of damage determination processing. And a notification unit 140 that performs notification processing. Since the damage detection system 100 includes the notification unit 140, the result of the damage determination process can be notified to the user.

  In the example of FIG. 3, the damage detection system 100 includes a first physical quantity sensor 110-1, a second physical quantity sensor 110-2, and a third physical quantity sensor 110-3 as a plurality of physical quantity sensors. Including.

  In this case, the processing unit 120 acquires the second physical quantity information from the second physical quantity sensor 110-2 among the plurality of physical quantity sensors, and based on the acquired second physical quantity information, the second inclination angle information Ask for. Then, the processing unit 120 performs a damage determination process based on the first tilt angle information and the second tilt angle information obtained using the first physical quantity sensor 110-1.

  Here, the second physical quantity sensor 110-2 may be the same type of sensor as the physical quantity sensor 110 shown in FIG. 1 (corresponding to the first physical quantity sensor 110-1 in FIG. 3). However, the present embodiment is not limited thereto, and the second physical quantity sensor 110-2 may be a different type of sensor from the first physical quantity sensor 110-1. However, as will be described later, the second physical quantity sensor 110-2 is different from the first physical quantity sensor 110-1 in the installation position in the structure. The same applies to the third physical quantity sensor 110-3.

  Accordingly, it is possible to determine whether or not the structure is damaged based on physical quantity information obtained from at least two physical quantity sensors.

  Further, in the example of FIG. 3, the processing unit 120 acquires the third physical quantity information from the third physical quantity sensor 110-3 among the plurality of physical quantity sensors, and based on the acquired third physical quantity information, The third tilt angle information is obtained. Then, the processing unit 120 performs damage determination processing based on the first tilt angle information, the second tilt angle information, and the third tilt angle information.

  Accordingly, it is possible to determine whether or not the structure is damaged based on physical quantity information obtained from at least three physical quantity sensors.

  Next, installation examples of the physical quantity sensor in the structure will be described with reference to FIGS. 4 to 9, the structure OB is provided between the first fixed point FP1 and the second fixed point FP2. Here, the fixing point is a point in contact with the structure in order to fix the structure at a given position. For example, in the example of FIGS. 4 to 9, the structure OB is a main girder of a bridge, and the first fixed point FP1 and the second fixed point FP2 are contact points of the main girder and the pier (abutment). However, the fixed point of the structure is not limited to this. For example, when the structure is a suspension bridge, in addition to the contact point between the main girder of the bridge and the pier, the contact point between the cable supporting the bridge and the main girder becomes a fixed point. In the example of FIG. 10, the structure OB is a building (building), and the fixed points FP1 to FP3 are contact points between the pile driven into the ground and the building. Further, as in the example of FIGS. 4 to 9, the structure OB may protrude outward from the first fixed point FP1 or the second fixed point FP2.

  In the example of FIG. 4, one physical quantity sensor SE1 is installed at the center (near the center) of the structure OB. In the example of FIG. 4, the center of the structure is the midpoint of a straight line connecting the first fixed point FP1 and the second fixed point FP2.

  For example, as shown in FIG. 4, when the external pressure PW is applied to the center portion of the structure OB, damage often occurs on the right side or the left side of the center of the structure OB. For example, when damage occurs on the right side of the center of the structure OB, the physical quantity sensor SE1 is tilted to the right side. When damage occurs on the left side of the center of the structure OB, the physical quantity sensor SE1 is on the left side. Tilt. Therefore, as shown in FIG. 4, if the physical quantity sensor SE1 is provided at the center of the structure OB, it is possible to determine in which direction the damage has occurred on the right side or the left side of the structure OB. Become.

  The example shown in FIG. 5 is an example in which two physical quantity sensors are provided. The first physical quantity sensor SE1 is provided on the first fixed point FP1 side of the structure OB, and the second physical quantity sensor SE2 is provided. , Provided on the second fixed point FP2 side of the structure OB. Here, the first fixed point FP1 side is a region between the center of the structure OB and the first fixed point FP1, and the second fixed point FP2 side is the center of the structure OB. And the second fixed point FP2. The center of the structure OB is, for example, the midpoint of a straight line connecting one end and the other end of the structure OB. For example, in the example of FIG. A5, the midpoint of one end and the other end of the structure on the surface in contact with the first fixed point FP1 and the second fixed point FP2 is the center of the structure OB.

  Thereby, the presence or absence of damage to the structure OB is determined based on the inclination angle of the structure OB on the first fixed point FP1 side and the inclination angle of the structure OB on the second fixed point FP2 side. Is possible.

  For example, as in the example of FIG. 6, when there is a damaged portion DAR between the first fixed point FP1 and the second fixed point FP2, the central portion of the structure OB collapses in the gravity direction DRG. Therefore, the first physical quantity sensor SE1 and the second physical quantity sensor SE2 are inclined in opposite directions. Accordingly, there is a significant difference between the first physical quantity information detected by the first physical quantity sensor SE1 and the second physical quantity information detected by the second physical quantity sensor SE2.

  Therefore, the processing unit 120 of the present embodiment obtains difference information between the first physical quantity information acquired from the first physical quantity sensor SE1 and the second physical quantity information acquired from the second physical quantity sensor SE2, and the difference is obtained. Based on the information, damage determination processing is performed.

  Here, the difference information is information indicating a difference between at least two pieces of physical quantity information. For example, when the physical quantity information indicates acceleration, the difference information is information indicating a difference in acceleration. The difference information may be information indicating a difference between two pieces of tilt angle information.

  For example, in the case of the example of FIG. 5, the structure OB is not tilted, and the first physical quantity information acquired from the first physical quantity sensor SE1 and the first physical quantity information acquired from the second physical quantity sensor SE2. There is almost no difference from the physical quantity information of 2. On the other hand, in the example of FIG. 6, since the first physical quantity sensor SE1 and the second physical quantity sensor SE2 are inclined in the opposite directions, the first physical quantity information and the second physical quantity are compared with the example of FIG. The difference with information is large. When the damage to the structure OB is further increased, the difference between the first physical quantity information and the second physical quantity information is further increased. In other words, the greater the difference between the first physical quantity information and the second physical quantity information, the more the structure OB is damaged in the region between the first physical quantity sensor SE1 and the second physical quantity sensor SE2. The possibility increases.

  Therefore, by performing damage determination processing based on the difference information between the first physical quantity information and the second physical quantity information, the presence or absence of damage in the region between the first physical quantity sensor SE1 and the second physical quantity sensor SE2 is determined. It becomes possible to detect.

  In the example of FIG. 7, the first physical quantity sensor SE1 is provided in the center of the structure OB, and the second physical quantity sensor SE2 is provided on one end side of the structure OB. Here, the one end side of the structure OB is the above-described first fixed point FP1 side or the second fixed point FP2 side.

  Accordingly, it is possible to perform damage determination processing for the structure OB based on the inclination angle near the center of the structure OB and the inclination angle on one end side of the structure OB. In the example of FIG. 7, for example, if the first physical quantity sensor SE1 is tilted to the right side, it can be estimated that there is damage on the right side of the first physical quantity sensor SE1, and the first physical quantity sensor SE1 is on the left side. If it is tilted, it can be estimated that there is damage on the left side of the first physical quantity sensor SE1. Further, when the first physical quantity sensor SE1 is tilted to the left and the second physical quantity sensor SE2 is tilted to the right, damage is caused between the first physical quantity sensor SE1 and the second physical quantity sensor SE2. If the second physical quantity sensor SE2 is tilted to the left side, it can be estimated that there is damage on the left side of the second physical quantity sensor SE2. Such a determination can be made based on the difference information of the physical quantity information described above.

  Further, the first physical quantity sensor SE1 is provided at a position adjacent to the second physical quantity sensor SE2 in the structure OB, and difference information of physical quantity information obtained from two physical quantity sensors provided at the adjacent positions. To determine the damage of the structure OB. That is, for example, as shown in FIG. 8, when the first physical quantity sensor SE1 to the third physical quantity sensor SE3 are installed in the structure OB, the processing unit 120 is detected by the first physical quantity sensor SE1. Difference information between the first physical quantity information and the second physical quantity information detected by the second physical quantity sensor SE2 installed adjacent to the first physical quantity sensor SE1 is obtained. Further, the processing unit 120 includes the first physical quantity information detected by the first physical quantity sensor SE1 and the third physical quantity sensor SE3 detected adjacent to the first physical quantity sensor SE1. Find the difference information with the physical quantity information. In the example of FIG. 8, damage determination processing is performed based on the obtained two difference information. Since the second physical quantity sensor SE2 and the third physical quantity sensor SE3 are not adjacent to each other, difference information between the second physical quantity information and the third physical quantity information is not calculated. Here, for example, the state in which the first physical quantity sensor SE1 and the second physical quantity sensor SE2 are provided at adjacent positions means that the first physical quantity sensor SE1 and the first physical quantity sensor SE1 are in a direction connecting one end and the other end of the structure OB. This is a state in which no other physical quantity sensor is provided between the second physical quantity sensor SE2.

  Thereby, for example, it is possible to specify which region is damaged among the four regions (AR1 to AR4) shown in FIG.

  The installation position of the physical quantity sensor is not limited to the above example. For example, as in the example of FIG. 9 and FIG. 10, when there is a clear part that is likely to be damaged in the structure OB, or there is a part that needs to be monitored whether it is damaged, Physical quantity sensors (SE1, SE2) may be arranged at both ends of the monitoring location CAR.

  As described above, the damage detection system 100 according to the present embodiment uses difference information between a plurality of physical quantity sensors that detect physical quantity information corresponding to the inclination angle of the structure and a plurality of physical quantity information acquired from the plurality of physical quantity sensors. And a processing unit 120 that performs a damage determination process for determining whether or not the structure is damaged based on the difference information.

  Thus, by providing a plurality of physical quantity sensors, it is possible to detect the inclination angles at a plurality of positions (installation positions) of the structure. And the difference information of the inclination angle between each installation position is obtained by calculating | requiring the difference information of the some physical quantity information. By determining whether or not the structure is damaged based on the difference information of the inclination angle, for example, it can be determined that damage has occurred between two sensors in which the difference in inclination angle is generated. In addition, the tilt angle is a physical quantity that changes over a long period of time compared to vibration or the like, and noise or the like can be reduced by smoothing. That is, by determining the presence or absence of damage to the structure based on the difference information of the inclination angle, it is possible to suppress erroneous determination of the presence or absence of damage due to noise or abnormal values in the detection of damage to the structure.

3. Next, the method of this embodiment will be described. First, the processing flow of this embodiment will be described with reference to the flowchart of FIG. First, the physical quantity sensor 110 detects physical quantity information (S101). Next, the processing unit 120 performs an averaging process on the detected physical quantity information to identify the tilt angle information (S102), and performs a structure damage determination process based on the identified tilt angle information (S103). ).

  Next, the process of each step will be described. In the present embodiment, the processing unit 120 performs, as the physical quantity information averaging process, a low-pass filter process of physical quantity information, or a process of obtaining an average value of physical quantities indicated by the physical quantity information output from the physical quantity sensor 110 in a given period. Do.

  The low-pass filter process is a process for extracting frequency component information lower than a given threshold value from physical quantity information detected by the physical quantity sensor. That is, in the low-pass filter processing, a high frequency component whose acceleration and inclination angle change instantaneously and immediately returns to the original is removed from the detected physical quantity information.

  When calculating the average value of physical quantities, for example, the moving average value is calculated for each arbitrary analysis section. In this case, the physical quantity sensor may perform intermittent measurement of the physical quantity in accordance with, for example, an arbitrary analysis section.

  Thereby, it is possible to remove information representing instantaneous vibration that becomes noise or an abnormal value in the damage determination process from the physical quantity information detected by the physical quantity sensor. As a result, it is possible to perform damage determination processing based on the change in the inclination angle over the medium to long term. In addition, when the averaging process is performed, if only the data after the averaging process is stored in the storage unit 130, the amount of data stored in the storage unit 130 can be compressed.

And the process part 120 calculates | requires the inclination-angle information of the structure mentioned above based on the result of a low-pass filter process, or the average value of physical quantity. For example, as the tilt angle information, as shown in FIG. 12, an angle θ _y of the y axis (horizontal axis) of the acceleration sensor SE with respect to the gravitational acceleration g ₀ direction is calculated.

  Further, the processing unit 120 uses at least one piece of information as a result of comparison between the inclination angle indicated by the inclination angle information and a given threshold value, a difference value of the inclination angle at at least two times, and a temporal change rate of the inclination angle. Based on this, damage determination processing is performed.

  The damage determination process is a process of determining whether or not there is damage to the structure, or the possibility that the structure is damaged.

  For example, when performing damage determination processing based on a comparison result between the inclination angle indicated by the inclination angle information and a given threshold value, it is determined that damage has occurred when the inclination angle is greater than the given threshold value. If the tilt angle is less than the given threshold, it is determined that no damage has occurred. This treatment is effective in the event of an earthquake or accident that is obviously large enough to damage the structure. For this reason, the given threshold value may not occur frequently, but is preferably set to an inclination angle that can be taken in an emergency such as an earthquake or an accident. For example, it is desirable that the given threshold value be an inclination angle that is at least three times the variation in inclination angle due to environmental noise or constant fine movement.

  In addition, when performing damage determination processing based on the difference value of the inclination angle at at least two times, it is determined that damage has occurred when the difference value is greater than a given threshold value, and the difference value is If it is below the given threshold, it is determined that no damage has occurred. This treatment is particularly effective when damage has occurred but the inclination angle gradually increases over time.

  Furthermore, when performing damage determination processing based on the time change rate of the inclination angle, it is determined that damage has occurred when the time change rate is greater than a given threshold, and the time change rate is given. If it is less than the threshold value, it is determined that no damage has occurred. The time change rate of the tilt angle is the rate of change (change rate) of the tilt angle per unit time. This treatment is particularly effective when the structure is damaged and the structure starts to inelastically deform.

  By combining a plurality of such damage determination methods, it is possible to determine the presence or absence of damage that occurs in the structure due to various causes. In addition, it is possible to determine the presence or absence of damage in the structure regardless of the difference in the change speed of the inclination angle of the structure. Note that the time change of the tilt angle information described above corresponds to the difference value of the tilt angle at the two times described above, the time change speed of the tilt angle, and the like.

  In addition, when two physical quantity sensors are installed in the structure, as described above, the damage is based on the difference information between the detected two physical quantity information or the difference information between the two inclination angle information. A determination process may be performed. That is, the processing unit 120 is based on at least one piece of information among a comparison result between the difference value indicated by the difference information and a given threshold, a further difference between the difference information at at least two times, and a temporal change rate of the difference value. Thus, damage determination processing may be performed.

  Moreover, the process part 120 may perform the damage position specific process in a structure based on inclination angle information and the result of a damage determination process. For example, the processing unit 120 identifies a combination of physical quantity sensors that maximizes the difference indicated by the difference information, and estimates that there is a damaged portion in a region between the attachment positions of the two identified physical quantity sensors.

  As a result, as described above with reference to FIGS. 4 to 8, it is possible to estimate a location where damage has occurred in the structure. And if the alerting | reporting part 140 alert | reports the estimated damage prediction location to a user, it will become possible for a user to confirm a damage prediction location and to inspect around the damage prediction location intensively.

For example, a specific example will be described with reference to FIGS. In the examples of FIGS. 13 to 15, seven physical quantity sensors (SE1 to SE7) are installed on the structure OB, and the external pressure PW is applied to the central portion of the structure OB, and damage determination is performed on the structure OB at that time. Processing and damage location identification processing are performed. Further, the graph of FIG. 14 is a graph in which the vertical axis is the difference value of the inclination angles of adjacent physical quantity sensors in the example of FIG. 13 and the horizontal axis is time. As shown in FIG. 14, in this example, the external pressure PW is applied to the structure OB for 3 hours from 13:00 to 16:00. Further, θ _{AR1 in} the graph of FIG. 14 is a difference value between the inclination angle detected by the physical quantity sensor SE1 of FIG. 13 and the inclination angle detected by the physical quantity sensor SE2, and the twist of the range indicated by AR1 of FIG. Represents the condition. The same applies to the other θ _AR1 to θ _AR7 .

As a result, as shown in FIG. 14, after 15:00, the absolute values of θ _AR2 and θ _AR4 are larger than other values. On the other hand, the other values (θ _AR1 , θ _AR3 , θ _{AR5 to} θ _AR7 ) gradually increase with time until about 14:30, but gradually decrease after 15 o'clock to reduce the external pressure PW. At 16:00 when I quit adding, it has almost returned to 0 degrees. This indicates that the structure OB is elastically deformed in the range of AR1, AR3, AR5 to AR7 in FIG. However, since θ _AR2 and θ _AR4 described above do not return to 0 degrees even at 16:00, it can be estimated that inelastic deformation occurs in the range of AR2 and AR4. Therefore, in the damage position determination process according to the present embodiment, it can be estimated that damage has occurred in a region CAR connecting the range AR2 and the range AR4 as shown in FIG.

  Then, when a cross section of the structure OB after this experiment is seen through, it is as shown in FIG. 15, and in addition to the fine cracks, a large scale is shown in the area indicated by DAR. It can be seen that damage has occurred. The region DAR in FIG. 15 is included in the candidate region CAR illustrated in FIG. 13 and is as predicted in the present embodiment.

  As described above, in the present embodiment, since the inclination angle information is calculated by the averaging process, the influence of temporary environmental influences (such as a vehicle traveling) and external factors on the result of the damage determination process is as follows. Compared with vibration analysis, it is possible to suppress erroneous determination. Moreover, since it detects long-term deterioration of the structure, the tilt angle information only needs to be specified about once every several tens of seconds. Furthermore, since the processing to be executed only once every several tens of seconds is only the physical quantity information averaging processing, the system can be downsized and intermittently operated, and power can be saved.

4). Modified Example Next, a modified example of the present embodiment will be described.

  In the present modification, the processing unit 120 obtains the tilt angle information and the vibration information of the structure based on the physical quantity information, and performs a damage determination process based on the tilt angle information and the vibration information.

  This makes it possible to perform damage determination processing and the like in consideration of both instantaneous vibration applied to the structure and medium to long-term inclination changes of the structure.

  Here, the vibration information is information representing the vibration of the structure. The vibration information can be said to be a high frequency component of the physical quantity information. On the other hand, the inclination angle information described above can be said to be a low frequency component of physical quantity information. Therefore, the processing unit 120 performs high-pass filter processing on the physical quantity information to obtain vibration information, and performs low-pass filter processing on the physical quantity information to obtain tilt angle information. The high-pass filter process is a process of extracting information on a frequency component higher than a given threshold value from the physical quantity information detected by the physical quantity sensor. In the high pass filter process, in contrast to the low pass filter process described above, information corresponding to instantaneous acceleration and change in tilt angle is extracted from the physical quantity information. Specifically, in the case of a change in tilt angle with a frequency greater than 100 Hz in a period of 1 ms, it is determined that the vibration is generated, and in a period of 1 ms, a change in tilt angle with a frequency lower than 0.1 Hz is determined. Determine that the structure is tilting slowly.

  This makes it possible to divide the physical quantity information into vibration information representing an instantaneous inclination change and inclination angle information representing a medium to long-term inclination change.

  Next, the processing flow of this modification will be described with reference to the flowchart of FIG. First, the physical quantity sensor detects physical quantity information (S201). Next, the processing unit 120 specifies vibration information and tilt angle information based on the physical quantity information (S202).

  Then, the processing unit 120 determines whether or not the vibration represented by the vibration information satisfies a given condition (S203), and determines that the given condition is satisfied. A determination process is performed (S204). A given condition is, for example, that the vibration is greater than a given threshold.

  This makes it possible to reduce the processing load when it is not necessary to perform damage determination processing.

  Next, the processing unit 120 determines whether or not the structure is damaged (S205), and determines that the structure is damaged based on the physical quantity information stored in the storage unit 130. Information analysis processing is performed (S206). And the alerting | reporting part 140 alert | reports the result of an analysis process to a user (S207).

  The vibration information analysis processing is, for example, processing for identifying the time when the structure is damaged, identifying the vibration of the structure at that time, and identifying an event that causes the structure to be damaged based on the identified information. It is. For example, when a structure is damaged due to an earthquake, a time when the structure is damaged is specified, and it is determined whether the structure is vibrated violently before and after the specified time. Then, the cause of the vibration of the structure is specified as an earthquake based on the time that the structure was vibrating and the magnitude of the vibration.

  This makes it possible to specify the cause of the damage to the structure. In addition, events such as earthquakes can be identified at the measurement interval level of physical quantity information.

  Further, in step S203, if the processing unit 120 determines that the damage determination process is not performed, the possibility that the structure is damaged is extremely low, and it is not necessary to perform the damage determination process. The notification unit 140 is notified.

  Further, in step S205, when the processing unit 120 determines that the structure is not damaged in the damage determination process, the processing unit 120 notifies the notification unit 140 that the structure is not damaged.

  In the above-described vibration information analysis process, the occurrence position of a crack or breakage can be identified by examining the output magnitude of each physical quantity sensor and the propagation speed of vibration. Further, the degree of deterioration of the structure can be specified by examining the frequency and the like by FFT analysis.

  In addition, when an event such as an earthquake is detected by vibration analysis, whether the structure has been damaged by determining whether there is a discontinuity in the inclination angle in the structure after the event is detected. It may be determined whether or not.

  For example, FIG. 17 shows an example of the result of vibration and tilt analysis processing. In the example of FIG. 17, it is determined that an event has occurred in the eight physical quantity sensors installed in the structure when a vibration greater than a given threshold value or a large inclination occurs, and time series Dots are plotted on the graph in order. In this example, many events have occurred from 13:00 to 17:30, and it can be estimated that the structure has been damaged during this period.

5. Second Embodiment Next, FIG. 18 shows a system configuration example of the second embodiment. In the second embodiment, the physical quantity sensor 110 and the damage detection apparatus 200 are configured separately. In this case, the damage detection apparatus 200 includes a processing unit 120 and a storage unit 130 that stores at least physical quantity information. Then, the processing unit 120 acquires physical quantity information corresponding to the tilt angle of the structure from the physical quantity sensor 110 provided in the structure, and performs an averaging process on the physical quantity information to obtain the tilt angle information of the structure. Further, the processing unit 120 performs damage determination processing for determining whether there is damage to the structure based on the tilt angle information or the time change of the tilt angle information. The content described above can be applied to the processing content performed by the processing unit 120.

  It should be noted that the method of this embodiment can also be implemented as a damage detection method. That is, in the damage detection method, the physical quantity information corresponding to the inclination angle of the structure is obtained from the physical quantity sensor provided in the structure, and the physical quantity information is averaged to obtain the inclination angle information of the structure. And performing a damage determination process for determining whether or not the structure is damaged based on the tilt angle information or the time change of the tilt angle information.

  Note that the damage detection system, the damage detection apparatus, and the like of the present embodiment may realize part or most of the processing by a program. In this case, a damage detection system, a damage detection apparatus, and the like according to the present embodiment are realized by a processor such as a CPU executing a program. Specifically, a program stored in a non-temporary information storage device is read, and a processor such as a CPU executes the read program. Here, an information storage device (device readable by a computer) stores programs, data, and the like, and functions as an optical disk (DVD, CD, etc.), HDD (hard disk drive), or memory (card type). It can be realized by memory, ROM, etc. A processor such as a CPU performs various processes according to the present embodiment based on a program (data) stored in the information storage device. That is, in the information storage device, a program for causing a computer (an apparatus including an operation unit, a processing unit, a storage unit, and an output unit) to function as each unit of the present embodiment (a program for causing a computer to execute the processing of each unit). Is memorized.

  In addition, the damage detection system, the damage detection apparatus, and the like according to the present embodiment may include a processor and a memory. The processor here may be, for example, a CPU (Central Processing Unit). However, the processor is not limited to the CPU, and various processors such as a GPU (Graphics Processing Unit) or a DSP (Digital Signal Processor) can be used. The processor may be a hardware circuit based on ASIC (Application Specific Integrated Circuit). Further, the memory stores instructions that can be read by a computer, and each part of the damage detection system and the damage detection apparatus according to the present embodiment is realized by executing the instructions by the processor. . The memory here may be a semiconductor memory such as an SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory), or may be a register or a hard disk. In addition, the instruction here may be an instruction of an instruction set constituting the program, or an instruction for instructing an operation to the hardware circuit of the processor.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the damage detection system, the damage detection device, and the program are not limited to those described in the present embodiment, and various modifications can be made.

100 ... Damage detection system, 110 ... Physical quantity sensor,
110-1 ... 1st physical quantity sensor, 110-2 ... 2nd physical quantity sensor,
110-3, a third physical quantity sensor, 111, an acceleration detection element, 112, a detection circuit,
DESCRIPTION OF SYMBOLS 120 ... Processing part, 130 ... Memory | storage part, 140 ... Notification part, 200 ... Damage detection apparatus

Claims (18)

A physical quantity sensor for detecting physical quantity information corresponding to the inclination angle of the structure;
A processing unit that performs an averaging process of the physical quantity information to obtain inclination angle information of the structure;
Including
The processor is
A damage detection system that performs a damage determination process for determining whether or not the structure is damaged based on the tilt angle information or a time change of the tilt angle information. In claim 1,
The processor is
Based on the comparison result between the tilt angle indicated by the tilt angle information and a given threshold, the difference value of the tilt angle at at least two times, and the time change rate of the tilt angle, based on at least one information, A damage detection system that performs the damage determination process. In claim 1 or 2,
The processor is
As the averaging process, a low-pass filter process of the physical quantity information, or a process of obtaining an average value of physical quantities indicated by the physical quantity information output from the physical quantity sensor in a given period is performed. In any one of Claims 1 thru | or 3,
A plurality of physical quantity sensors for detecting the physical quantity information corresponding to the inclination angle of the structure;
The processor is
Obtaining second physical quantity information from a second physical quantity sensor among the plurality of physical quantity sensors;
Based on the acquired second physical quantity information, second inclination angle information is obtained,
The damage detection system, wherein the damage determination process is performed based on the tilt angle information obtained by using the physical quantity sensor of the plurality of physical quantity sensors and the second tilt angle information. In any one of Claims 1 thru | or 4,
The processor is
A damage detection system, wherein a damage position specifying process in the structure is performed based on the tilt angle information and the result of the damage determination process. In claim 4,
The processor is
Obtaining third physical quantity information from a third physical quantity sensor of the plurality of physical quantity sensors;
Based on the acquired third physical quantity information, third inclination angle information is obtained,
A damage detection system that performs the damage determination processing based on the tilt angle information, the second tilt angle information, and the third tilt angle information. In any one of Claims 4 thru | or 6.
The structure is
Provided between the first fixed point and the second fixed point;
The physical quantity sensor
Provided on the first fixed point side of the structure;
The second physical quantity sensor is
A damage detection system provided on the second fixed point side of the structure. In any one of Claims 4 thru | or 6.
The physical quantity sensor
Provided in the center of the structure,
The second physical quantity sensor is
Provided on one end side of the structure,
The processor is
Obtaining difference information between the first physical quantity information acquired from the physical quantity sensor and the second physical quantity information acquired from the second physical quantity sensor, and performing the damage determination process based on the difference information. Damage detection system featuring. In any one of Claims 4 thru | or 6.
The physical quantity sensor
In the structure, provided at a position adjacent to the second physical quantity sensor,
The processor is
Obtaining difference information between the first physical quantity information acquired from the physical quantity sensor and the second physical quantity information acquired from the second physical quantity sensor, and performing the damage determination process based on the difference information. Damage detection system featuring. In any one of Claims 1 thru | or 9,
The processor is
A damage detection system characterized in that the tilt angle information and the vibration information of the structure are obtained based on the physical quantity information, and the damage determination process is performed based on the tilt angle information and the vibration information. In claim 10,
The processor is
The physical quantity information is subjected to high-pass filtering to obtain the vibration information,
A damage detection system, wherein the physical quantity information is subjected to low-pass filter processing to obtain the tilt angle information. In claim 10 or 11,
A storage unit for storing the physical quantity information;
The processor is
When it is determined that the structure is damaged based on the inclination angle information, the vibration information is analyzed based on the physical quantity information stored in the storage unit. Detection system. In any of claims 10 to 12,
The processor is
It is determined whether the vibration represented by the vibration information satisfies a given condition, and when it is determined that the given condition is satisfied, the damage determination process is performed based on the tilt angle information. Feature damage detection system. In any one of Claims 1 thru | or 13.
The damage detection system characterized by including the alerting | reporting part which performs alerting | reporting process based on the result of the said damage determination process. A plurality of physical quantity sensors for detecting physical quantity information corresponding to the inclination angle of the structure;
A processing unit that obtains difference information of a plurality of physical quantity information acquired from the plurality of physical quantity sensors, and performs a damage determination process that determines whether or not the structure is damaged based on the difference information;
A damage detection system comprising: A processing unit for obtaining physical quantity information corresponding to the inclination angle of the structure from a physical quantity sensor provided in the structure, averaging the physical quantity information, and obtaining the inclination angle information of the structure;
A storage unit for storing at least the physical quantity information;
Including
The processor is
A damage detection apparatus that performs a damage determination process for determining whether or not the structure is damaged based on the tilt angle information or a time change of the tilt angle information. Obtaining physical quantity information corresponding to the inclination angle of the structure from a physical quantity sensor provided in the structure;
Performing an averaging process of the physical quantity information to obtain inclination angle information of the structure;
Performing a damage determination process for determining the presence or absence of damage to the structure based on the inclination angle information or the time change of the inclination angle information;
A damage detection method comprising: As a processing unit that obtains physical quantity information corresponding to the inclination angle of the structure from a physical quantity sensor provided in the structure, averages the physical quantity information, and obtains the inclination angle information of the structure,
Make the computer work,
The processor is
A program for performing damage determination processing for determining whether or not the structure is damaged based on the tilt angle information or a time change of the tilt angle information.