JP2009211433A - Monitoring system and sensor unit used for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable an inspector M who visits an afflicted area to easily utilize useful information gathered in a database, in a monitoring system S for detecting an earthquake motion by a sensor unit 2 installed in a building 1 or the like and recording it in the database of a server 3. <P>SOLUTION: A PDA 5 carried by the inspector M acquires ID information from the sensor unit 2 of the building 1 or the like in the afflicted area, and automatically acquires required information by wireless communication from the server 3 on the basis of the acquired ID information. The data of an acceleration by the earthquake motion and the information of the building, etc., are included in the acquired required information, and thus, the inspector M can accurately predict vulnerability to collapse without mistakes even when the inspector M is relatively inexperienced and is not skilled so much. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a monitoring system for detecting and recording the vibration state of a building or a building such as a bridge or a civil engineering structure, and a sensor unit used therefor.

  2. Description of the Related Art Conventionally, there has been known a system in which an accelerometer is arranged on, for example, a pillar, beam, or wall of a building, and the vibration history information is recorded for a predetermined period when vibration due to an earthquake or the like occurs. As an example, in the ones described in Patent Documents 1 and 2, when vibration is applied to a building, an IC chip is driven by using an output from an accelerometer as an electromotive force, thereby storing a vibration waveform. Thus, by recording the vibration waveform only when vibration is applied, useless data recording is not performed, and recording can be continued for a long period of time.

  In the conventional example, a so-called wireless IC tag is provided integrally with the accelerometer, and a vibration waveform is recorded using an IC chip and a memory included therein. If the user brings the information reading / recording device close to the accelerometer as necessary, data can be read by wireless communication, so wiring with the accelerometer is not required, and the effort for that is also reduced. It can be omitted.

Furthermore, Patent Document 3 describes a system in which a vibration state of a plurality of devices constituting a plant is monitored online and an abnormality of the device is detected from a change in the vibration state. In this device, signals from a large number of sensors are collected in a vibration analysis device by wireless communication, and the cause of vibration is specified by FFT analysis. The signal from the sensor includes detection time information in addition to vibration information, so that even when the communication time changes, each signal can be time-synchronized for accurate analysis.
JP 2006-38482 A Japanese Patent Laid-Open No. 2006-3202 JP 2006-242836 A

  By the way, the monitoring system as in the latter conventional example is applied to civil structures such as bridges and viaducts, and more general buildings, etc., so as to grasp damage caused by earthquakes as in the former case. It is also possible to construct a system. According to such a system, useful information for quantitatively determining the damage status of buildings, etc. when large earthquakes occur is collected, and emergency collapse risk prediction is performed accurately. This is useful for ensuring the safety of residents.

  However, the safety of buildings after an earthquake has to be judged by an inspector who has been sent to the disaster-stricken area. Variations in skill level will increase.

  In addition, when information is read from an IC tag chip installed in a building as in the former conventional example, it is necessary to individually manage information on each terminal, and data from a plurality of IC tags installed on the building is stored. It is necessary to go to the place of installation one by one and acquire it, the latest information collection display is impossible, and the acceleration information transmitted to the server cannot be referred to, displayed and analyzed.

  In view of these points, the main object of the present invention is to make it possible to easily use the information collected by the monitoring system as described above so that a large number of inspectors can easily use the information in the stricken area so that accurate risk of collapse can be predicted. Is to make it.

  In order to achieve the above object, the present invention is configured such that a portable terminal acquires ID information relating to a building or the like in a stricken area, and automatically acquires necessary information by wireless communication from a server computer based on the ID information. did.

  That is, according to the first aspect of the present invention, a sensor unit is installed in a building or a civil engineering structure, and vibration information relating to a vibration state detected thereby is transmitted to a server computer by wireless communication, and ID information unique to the sensor unit is obtained. Is a monitoring system that is recorded in the vibration database in association with the server, and can be connected to the server computer by wireless communication, and a request signal for requesting the vibration information in accordance with a predetermined operation by the user together with ID information. A portable terminal for transmitting to the server computer is provided.

  The server computer includes information providing means for receiving the request signal, reading vibration information related to corresponding ID information from the vibration database, and transmitting the vibration information to the portable terminal, The portable terminal transmits ID information acquisition means for acquiring ID information from the sensor unit by wireless communication, vibration information request means for transmitting a request signal together with the ID information to the server computer, and transmission from the server computer that has received the request signal. Vibration information display means for receiving the vibration information to be displayed and displaying it to the user.

  According to the system, when a predetermined operation is performed on a terminal carried by an inspector who has visited the disaster area after the occurrence of an earthquake, the ID information acquisition unit of the mobile terminal acquires ID information from the sensor unit by wireless communication, The required vibration information corresponding to this ID information is acquired from the server computer by wireless communication and displayed to the inspector who is the user. This vibration information includes, for example, information on the vibration history of the building where the sensor unit is installed, and based on this, the inspector quantitatively grasps the damage status of the building, etc. Can predict the risk of collapse.

  Preferably, the sensor unit includes a wireless IC tag in which ID information is recorded, and the ID information acquisition means of the portable terminal acquires the ID information from the wireless IC tag. 5). In this way, the inspector can obtain the ID information simply by holding the portable terminal over the sensor unit installed near the entrance of the building, for example. Note that the distance of wireless communication using the wireless IC tag is considered to increase to 1 meter or more in the future, and it becomes unnecessary to hold the portable terminal.

  Alternatively, the wireless IC tag code may be stored in the sensor unit itself, read by a terminal with which the sensor unit is attached, and transmitted to the portable terminal by wireless communication.

  Preferably, the server computer is provided with a building database in which information (structure, location, inspection, analysis, earthquake history information, etc.) of the building or civil engineering structure where the sensor unit is installed is recorded. When transmitting the vibration information to the portable terminal in response to the request signal, the information including the building or civil engineering structure is also transmitted (claim 2). In this way, it is possible to more accurately predict the risk of collapse from not only the history of earthquake vibrations but also information on buildings or civil engineering structures that are difficult to understand from the exterior. In particular, if data on vibration characteristics of buildings or civil engineering structures collected by experiments before the occurrence of an earthquake is used as information on buildings or civil engineering structures, damage caused by earthquakes can be determined fairly accurately.

  In other words, according to the monitoring system according to the present invention, inspectors who went to the stricken area after the earthquake can acquire information such as buildings and vibration history due to the earthquake, etc. Even an inspector who is not high can definitely predict the collapse risk based on such information.

  Since various inspection results including prediction of collapse risk performed in this way are input to the portable terminal by a predetermined operation of the inspector, it is preferable that the inspection information regarding the building or the like is a wireless IC. It is transmitted to the server computer by the inspection information transmitting means together with the ID information acquired from the tag, and the server computer receiving the information associates the inspection information with the ID information and records it in the inspection information database.

  Furthermore, for example, when sensor units are installed on higher floors such as the first floor, the fifth floor, and the 10th floor of the building, or when they are installed in multiple locations on the same floor, By combining the vibration information obtained by the sensor unit, it is possible to know how, for example, the vibration transmission characteristics of the building have changed due to the earthquake motion, and thereby the degree of damage can be determined.

  For this purpose, vibration information relating to a plurality of sensor units installed in the same building or civil structure is recorded in the vibration database of the server computer in association with each other, and any one of the plurality of sensor units is recorded. When transmitting the vibration information according to the above, it is only necessary to transmit the vibration information including other vibration associated sensor units (claim 3). However, when determining by combining vibration information relating to a plurality of sensor units, the time axes of the vibration information must match.

  Therefore, preferably, the sensor unit is provided with clock means capable of setting the time, and the time information by the clock means is added to the vibration information and transmitted to the server computer, and the plurality of sensor units are the same. In the case of installing in a building, the plurality of sensor units are connected by a signal line, and the sampling time is matched to guarantee the sampling time and the absence of sampling data.

  For this purpose, each sensor unit has an input / output port that can be switched to the input side and output side of the sync signal, a sync signal output means for outputting a sync signal from the input / output port switched to the output side, and an input side. It is preferable to provide time value reset means for receiving the synchronization signal at the switched input / output port and resetting the time value of the timepiece means.

  In this way, any one sensor unit can be set to the output side, and all the remaining units can be set to the input side, and a synchronization signal can be output from the sensor unit on the output side, so that all units can be time synchronized. it can. Because they are connected by signal lines, they can be accurately synchronized unlike radio, and if they are connected in parallel in a daisy chain, less wiring is required. In addition, it is not necessary to individually set for the trigger output or reception of the synchronization signal individually.

  By the way, since the monitoring system applied to a general building or the like has a significantly larger number of vibration detection targets than that applied to a plant as in the conventional example (Patent Document 3), an earthquake occurs. In such a case, an excessively large number of signals may be concentrated on the server computer and temporarily cannot be processed.

  For this, the sensor unit is provided with an analysis operation means such as an FFT algorithm, and the vibration data detected by the sensor is subjected to FFT processing, and only the analyzed data is transmitted to the server computer (claims). Item 7). In this way, it is possible to significantly reduce the amount of wireless communication compared to transmitting raw data, and there is no need to perform analysis calculations on the server side, so the processing load in the event of an earthquake is reduced. Can be greatly reduced.

  More preferably, the sensor unit is provided with a signal processing means for separating the acceleration sensor and its output into an alternating current component and a direct current component, and switching to either of them to perform signal processing, and detecting based on the alternating current component. The vibration information related to the vibration state is transmitted to the server computer (claim 8). That is, the acceleration signal generally used for detecting the vibration state includes a DC component superimposed on the gravitational acceleration in addition to the AC component representing the dynamic acceleration. If the resolution of AD conversion is increased, the amount of data becomes very large.

  In this regard, if the sensor output is separated into an AC component and a DC component, the vibration state can be detected without being affected by gravity, and it is not necessary to increase the resolution when AD converting only the AC component. Therefore, the amount of data can be reduced and the amount of wireless communication can be reduced accordingly.

  In such a case, the sensor unit is configured to detect the inclination state of the building or the civil engineering structure based on the DC component of the output of the acceleration sensor, and transmit the detected value to the server computer together with the vibration information. Preferred (claim 9). In this way, more accurate determination can be made with information on the inclination of the building or the like caused by the earthquake.

  A sensor of the sensor unit is preferably a three-axis acceleration sensor that can detect acceleration in each direction of three orthogonal axes. This is because, for example, the single axis maximum acceleration data alone is not sufficient for high-accuracy risk determination, and it depends on the direction of the three-dimensional vibration, the peak frequency and the magnitude of the vibration frequency analysis, and the like. It is because it is preferable.

  In such a case, the signal processing means of the sensor unit separates the output for each axis of the triaxial acceleration sensor into an AC component and a DC component, respectively, and based on only the DC component of the output of each axis, gravity It is preferable to provide an inclination angle calculating means for calculating the inclination angle of each axis from the vertical direction regardless of the acceleration value.

That is, when attention is paid to the fact that the gravity vector obtained from the DC components x, y, z of the outputs of the three axes is directed vertically downward, the magnitude of this vector A = √ (x ² + y ² + z ² ) = Arcsin (x / A), θy = arcsin (x / A), θz = arcsin (x / A). According to this formula, the influence of gravity that differs slightly depending on the measurement location is eliminated, and the influence of sensitivity fluctuations due to temperature changes for each axis of the acceleration sensor is canceled to identify the inclination of the acceleration sensor. Can do.

  Therefore, according to the sensor unit, it is possible to stably detect the omnidirectional angle, and it can be used for alignment when installing it in a building or the like, and the inclination of the building or the like changes with time. However, it is possible to accurately detect vertical and horizontal vibrations caused by an earthquake without being affected by this. It is also possible to know the inclination of a building or the like immediately after the earthquake. Furthermore, the sensor unit can be installed regardless of a cold region or a warm region, and temperature compensation or automatic calibration of the acceleration sensor in that case is not necessary.

  More specifically, when the amplitude of the AC component of any axis output of the acceleration sensor exceeds a predetermined threshold, the sensor unit detects a vibration state based on the AC component until a predetermined time thereafter, and then Based on the average value of the DC component for each axis until a predetermined time after switching to the DC component, the tilt angle from the vertical direction of each axis may be calculated by the tilt angle calculating means (claim) Item 11).

  Furthermore, the sensor unit is equipped with a camera that records an image of a building or a civil engineering structure. When the amplitude of the AC component of the acceleration sensor output exceeds a predetermined threshold, recording by the camera is started, and after a predetermined time It is also possible to obtain the recorded data up to and transmit this recorded data together with the vibration information to the server computer (claim 12). In this way, the recorded image at the time of the occurrence of the earthquake is added and the determination becomes more accurate.

  By the way, in addition to the risk determination after the earthquake as described above, the monitoring system of the present invention can be used to confirm the effect of so-called seismic reinforcement. In other words, when repairing a building for the purpose of strengthening earthquake resistance as a preventive measure against collapse, the building is shaken using an exciter (vibrator), and multiple locations of the building are monitored at the same time. Is specified in a narrow range.

  In this case, generally, a plurality of accelerometers are connected to one data collection device by wire and displayed in real time on a screen on a personal computer. Some wireless devices transmit acceleration data to the data collection device after obtaining the acceleration data.

  However, if it is a wired system, it takes time and money to install, and it is difficult to change the installation location easily. In addition, when browsing and analyzing data after acquiring data even if it is wireless, increase the number of wireless accelerometers or specify the location of the accelerometer at the end of each measurement in order to identify locations that require significant vibration. Because it is necessary to re-measure and find the reinforcement point, it takes a lot of time and effort.

  On the other hand, the monitoring system of the present invention installs a plurality of sensor units in a building or a civil engineering structure, and transmits information related to the vibration or tilt state detected by each to a computer device by wireless communication, to the user. The plurality of sensor units each include an acceleration sensor and an operation command transmitted from the computer device via wireless communication for a predetermined period of time. Acceleration data acquisition means for acquiring the output from the data, and data transmission means for transmitting the acceleration data acquired by the acceleration data acquisition means to the computer device by wireless communication (claim 13).

  According to this system, by incorporating the above-described various configurations as appropriate, time-synchronized acceleration data from the sensor units installed at a plurality of locations such as the building, etc. at the time of seismic reinforcement of the building or the like as described above can be obtained. Waveform display and analysis display that match the time axis in real time are possible. In addition, it is possible to accurately determine a point to be reinforced such as a building in a two-dimensional or three-dimensional manner, and to reduce the time and cost for the reinforcement.

  Preferably, the sensor unit is provided with calibration value storage means for storing a calibration value for converting an integer data value output from the acceleration sensor into a predetermined unit data value including a decimal point. Is added to the integer data value as vibration information and transmitted to the server computer (claim 14). In other words, if the integer data value that is the sensor output is converted to a decimal value such as float or doubule according to the unit of acceleration, for example, the amount of transmitted data will increase several times, so conversion is performed before communication. If a calibration value for conversion is transmitted together with an integer data value and converted by a computer device, the amount of communication can be reduced overwhelmingly.

  By the way, the sensor unit as described above can be used not only for the monitoring system described above but also for various other purposes. Therefore, the invention of claim 15 is a three-axis acceleration sensor capable of detecting acceleration in each of three orthogonal directions, and signal processing for separating the output of each axis of the sensor into an AC component and a DC component, respectively. And a tilt angle calculating means for calculating the tilt angle of each axis from the vertical direction regardless of the value of the gravitational acceleration based only on the DC component of the output for each axis. In this sensor unit, as described above, the tilt angle calculation means corrects variations in sensitivity and offset of the sensor due to temperature changes based on the value of the gravity vector synthesized from the output of the triaxial acceleration sensor. ).

  As described above, according to the monitoring system of the present invention, the vibration state of a building or the like due to an earthquake is detected by the sensor unit and recorded in the database of the server computer, while the inspector carries it in the disaster area. ID information is obtained from a sensor unit such as a building by a terminal, and based on this information, information on the building and vibration history information due to earthquake motion are automatically transmitted from the server computer. If useful information can be used very easily in this way, even inexperienced inexperienced inspectors may understand the damage status of buildings, etc. due to earthquakes, and be able to accurately collapse. Definitely predict the degree.

  In addition, during seismic reinforcement of buildings, etc., it is easy to accurately determine the locations requiring reinforcement in 2D or 3D by monitoring in real time based on time-synchronized acceleration data from multiple sensor units. In addition, the time and cost required for reinforcement can be kept low.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the following description of preferable embodiment is only an illustration essentially, and is not intending restrict | limiting this invention, its application thing, or its use.

(Embodiment 1)
FIG. 1 shows an overview of an embodiment in which a monitoring system according to the present invention is used for monitoring (monitoring) of earthquake motion. In this system S, various buildings such as buildings and bridges or civil structures 1, 1,. Sensor units 2, 2,... For detecting vibrations are installed in (shown as an example in a 10-story building in the figure), and information on the detected vibrations is stored in a server computer 3 (hereinafter simply referred to as server 3). To send). The server 3 may be installed in a management company such as a building 1, 1,..., Or may be installed in a local government disaster prevention center or the like.

  In the illustrated example, the server 3 is connected to the sensor units 2, 2,... Via the wireless LAN 4 or the Internet so as to be capable of two-way communication, and vibration information sent from the sensor units 2, 2,. The information is stored (recorded) in a database (acceleration data information DB) of the external storage device 30 in association with the data. In this acceleration data information DB, for example, measurement data of acceleration due to earthquake motion and data after FFT processing (see FIG. 7) are stored as vibration information in association with the ID information and the like along with the measurement date and time. That's fine.

  Thus, the information stored in the external storage device 30 of the server 3 can be searched and viewed at any time by ID recognition. For example, when an inspector M (user) inspecting the damage situation of the building 1 or the like as shown in the figure performs a predetermined operation, the portable terminal 5 is connected to the server 3 via the wireless LAN 4, PLC and the Internet. The acceleration data information as described above can be acquired from the server 3. In the example shown in the figure, the portable terminal 5 is a PDA (Personal Digital Asistance). Hereinafter, the PDA 5 will be described in this embodiment, but this may be a notebook personal computer or a mobile phone.

  Further, the information such as the acceleration data can be acquired by another user U by the mobile phone 6 as shown in the figure. The PDA 5 and the cellular phone 6 are connected to the server 3 via the Internet as shown in the figure as needed during operation and constitute a so-called server / client environment in a logged-in state. Bidirectional communication can be performed according to a typical communication method.

−Configuration of sensor unit−
As shown in FIG. 2, the sensor unit 2 of this embodiment includes an acceleration sensor module 7 and a PDA 8, and includes a wireless IC tag 9 in which unique ID information is recorded, although not shown in the figure. It is out. As schematically shown in FIG. 3, the wireless IC tag 9 is a known device having an IC chip 9a and an antenna 9b for wireless communication. From the reader / writer 10 attached to the PDA 5 carried by the inspector M, Can be activated by electromagnetic induction and transmit the recorded information (read), or record the information transmitted from the reader / writer 10 (write). The wireless IC tag 9 may be disposed integrally with the acceleration sensor module 7 or the PDA 8 or may be disposed separately.

  The acceleration sensor module 7 includes a triaxial acceleration sensor 70 that detects acceleration in each of the orthogonal three axes X, Y, and Z, and a microcomputer 71 after applying predetermined preprocessing to an output signal for each axis. And a signal processing circuit 72 (signal processing means) for inputting to (MPU). Control of the signal processing circuit 72 (operation of a semiconductor switch 72b described later and gain adjustment of the amplifier 72c) is performed by the MPU 71.

  Here, the triaxial acceleration sensor 70 is a known sensor using so-called MEMS (Micro Electro Mechanical System) technology, and has a highly sensitive frequency band and amplitude according to the building or civil engineering structure that is the object of vibration detection. It has been adjusted. The output signals for each of the X, Y, and Z axes are sent to the signal processing circuit 72 through filters and the like, and are separated into an AC component (AC) and a DC component (DC). In the example shown in the figure, an AC component appears in the upper wiring where the capacitor 72a is interposed, and a DC component appears in the lower wiring. Any one of these components is switched by the semiconductor switch 72b and input to the variable gain amplifier 72c for amplification. After that, it is AD converted and input to the microcomputer 71 (MPU).

  That is, in general, an acceleration signal is superimposed with an alternating current component representing dynamic acceleration and a direct current component proportional to static gravitational acceleration, and if the resolution of AD conversion is increased in order to increase detection accuracy, Since the amount of data becomes very large, the influence of gravity can be eliminated by using only the separated AC component as described above, so that the resolution of AD conversion does not have to be so high. Can be reduced. The DC component is used for detecting the tilt of the sensor 70 as will be described later. If six AD converters are provided, simultaneous sampling of AC and DC is possible.

  The MPU 71 has a CPU, a ROM, a RAM, a timer, and a communication port as well known, and an EEPROM that is an electrically erasable / rewritable memory. The EEPROM stores data such as the direction of the semiconductor switch 72b of the signal processing circuit 72, the gain control value of the variable gain amplifier 72c, or the calibration value of the three-axis acceleration sensor 70. The gain data is read from the EEPROM in accordance with the switching.

  The MPU 71 is connected to a counter 73 that supplies the AD converter sampling timing and a reference clock 74 (a clock means that combines the counter 73 and the MPU 71) and an acceleration sensor module. 7 is connected to an operation unit 75, a buzzer 76, and a display 77 for displaying a communication state and a vibration waveform. Further, a general communication device 78 and an input / output terminal 79 for time synchronization (input / output port) are connected. ) Is also connected. The communication device 78 may be, for example, serial communication RS232C, USB, wireless LAN, wired LAN, Bluetooth, ZigBee, or the like.

  The time synchronization input / output terminal 79 can be switched to either the signal input side or the output side by the CPU, and a plurality of sensor units 2, 2,... In order to synchronize their time axes, the input / output terminals 79 of the plurality of sensor units 2, 2,... Are connected in parallel by signal lines as shown in FIG. In this way, the number of wirings is much smaller compared to connecting signal lines from any unit 2 to all other units 2, 2,. When the time synchronization operation described later is finished, the signal line is removed.

  In the acceleration sensor module 7 configured as described above, the CPU of the MPU 71 executes a program stored in, for example, a ROM, so that the AC component of the output from the triaxial acceleration sensor 70 will be described in detail later. It is taken in as acceleration data and temporarily stored in the RAM. This data is normally updated at intervals of about 100 seconds, for example. However, when a vibration greater than a predetermined value due to an earthquake or the like is input, a predetermined time period starting from a point that is a predetermined time (for example, 1 second) from that point Data until the elapsed time is transmitted to the PDA 8.

  The PDA 8 that accepts acceleration data transmitted from the acceleration sensor module 7 is a portable computer device that includes a CPU, ROM, RAM, and the like. The PDA 8 has a built-in storage device, a display, an operation unit, and a wireless communication device. (See PDA 5 in FIG. 3). The internal storage device of the PDA 8 stores an analysis calculation program for FFT processing of acceleration data and a transmission program for transmitting the calculated data and the like to the server 3 together with the ID information of the wireless IC tag 9.

  Further, as will be described in detail later, the internal storage device of the PDA 8 has an inclination angle θx from the vertical direction G of each axis X, Y, Z based on the DC component of the output of each axis of the triaxial acceleration sensor 70. , Θy, θz (see FIG. 4), that is, an inclination angle calculation program for calculating the inclination of the sensor 70 itself is also stored. Since the tilt of the sensor 70 itself can be detected in this way, the omnidirectional angle can be detected stably, and even if the building 1 is tilted, the seismic motion can be accurately detected separately in the vertical and horizontal directions. In addition, the inclination of buildings due to earthquakes can be detected.

  When the analysis calculation program is executed by the CPU, the PDA 8 includes analysis calculation means for performing FFT processing on the vibration data detected by the acceleration sensor module 7, and similarly executes the tilt angle calculation program. By doing so, an inclination angle calculating means for calculating the inclination of each of the three axes X, Y, and Z from the vertical direction G is provided. In other words, the analysis calculation means and the inclination angle calculation means are configured by a software program.

-Server and mobile terminal configuration-
Next, the server 3 will be described. This is a computer device having a general configuration that mainly functions as an application server for the PDAs 5,..., 8,. Are read and executed as necessary. Although illustration is omitted, the server 3 is connected to an external storage device 30 such as a hard disk drive in addition to a keyboard, mouse, display, and the external storage device 30 in addition to the acceleration data information DB described above. In addition, there is a database DB that records various information useful for predicting the risk of collapse in the event of an earthquake.

  In the illustrated example, the external storage device 30 is provided with an ID information DB, a building information DB, an inspection information DB, a user information DB, and a terminal information DB in addition to the acceleration data information DB. In the ID information DB, the ID information (16-digit number, etc.) recorded in the wireless IC tags 9, 9,... For each sensor unit 2, 2,. It is recorded as an installation ID. Therefore, when sensor units 2, 2,... Are installed on the first floor, the fifth floor, and the tenth floor as in the building 1 shown in FIG. 1, the acceleration data relating to these three sensor units 2, 2,. Information is associated with each other.

  In addition, the building information DB stores information such as the location of the buildings 1, 1,... Where the sensor units 2, 2,... Are installed, the completion time, the structure type, the usage, the number of floors, etc. 9). The inspection information DB records the inspection results of buildings and the like performed in the past for each inspection item, and the user information DB is a user permitted to access the system (inspector or building owner). Information is recorded, and in the terminal information DB, unique information of the terminals constituting the sensor unit 2 such as the PDA 8 is recorded (see FIG. 10).

  The server 3 receives the analyzed acceleration data sent by wireless communication from the PDAs 8 of the sensor units 2, 2,... As described above, and the sensor units 2, 2,. The data storage program stored in the acceleration data information DB in a state associated with the ID information unique to the data, and predetermined information such as acceleration data information in accordance with a request signal from the PDA 5 carried by the inspector M is read out from the database to obtain the PDA And a recording program for recording the inspection information transmitted from the PDA 5 in the inspection information DB in association with the ID information. When the CPU executes this information providing program, the server 3 includes information providing means for providing acceleration data information and the like in response to a request from the PDA 5.

  On the other hand, the terminal carried by the inspector M, that is, the PDA 5 may be basically the same as the PDA 8 of the sensor unit 2, but this includes a reader / writer 10 of the wireless IC tag 9 as shown in FIG. Are connected, and ID information can be read from the wireless IC tag 9 of the sensor unit 2 installed in the building 1 or the like. That is, in the internal storage device of the PDA 5, the reader / writer 10 is activated in response to a predetermined operation performed on the operation unit 5 b, thereby reading ID information from the wireless IC tag 9 of the sensor unit 2 by wireless communication. An ID information acquisition program is stored, and this program and the reader / writer 10 constitute an ID information acquisition unit.

  In addition, the internal storage device of the PDA 5 obtains ID information as described above and then sends an information request program for transmitting a request signal such as acceleration data information to the server 3 together with the ID information from the server 3 receiving the request signal. An information display program for receiving transmitted information and displaying it on the display 5a is stored, and these programs constitute vibration information requesting means and vibration information display means. Thus, the information displayed on the display 5a includes not only the vibration history due to the earthquake, but also information such as the structure and age of the building 1 as will be described later. The worker M can accurately predict the collapse risk level of the building 1 or the like.

  Further, in the internal storage device of the PDA 5, an inspection information transmission program for transmitting an inspection result of a building or the like input by a predetermined operation of an inspector M as a user to the server 3 together with ID information read from the wireless IC tag 9; Is stored, and this program constitutes the inspection information transmission means.

(System installation and operation)
Below, the monitoring system S mentioned above is demonstrated more concretely. First, when the sensor units 2, 2,... Are installed in buildings 1, 1,..., The X axis and Y axis of the triaxial acceleration sensor 70 are made to coincide with each other in the horizontal direction, and the Z axis is made to coincide with the vertical direction. For this purpose, with the sensor 70 temporarily installed, first, the inclination angles θx, θy, θz of the respective axes X, Y, Z from the vertical direction G shown in FIG. 4 are calculated based on the outputs for the respective axes, Find the tilt of the sensor itself.

  That is, when the sensor unit 2 is temporarily installed in a building or the like and a predetermined operation is performed on the PDA 8, the CPU activates the tilt angle calculation program and transmits an operation command to the MPU 71 of the acceleration sensor module 7. Receiving this, the MPU 71 switches the semiconductor switch 72b of the signal processing circuit 72 to take in the DC component of the output for each of the axes X, Y and Z of the triaxial acceleration sensor 70. Data for each DC component x, y, z is transmitted to the PDA 8.

In the PDA 8 that has received the data, the inclination angles θx, θy, and θz from the vertical direction G of the X, Y, and Z axes based on the DC components x, y, and z of the outputs of the three axes are expressed by the following equations. Calculate by (1) to (4). That is, θx = arcsin (x / A) (1), θy = arcsin (x / A) (2), θz = arcsin (x / A) (3), A = √ (x ² + y ² + z ² )… (4). Note that “A” in Expression (4) represents the magnitude of the gravity vector G obtained from the DC components x, y, and z of the outputs of the three axes.

Here, in general, in the three-axis acceleration sensor 70 using the MEMS technology, since the three axes are formed in the same semiconductor, electrical sensitivity changes and offsets caused by environmental temperature fluctuations and the like are comparable. Occurs at a rate of If this sensitivity change is α,
A ′ = √ {(x · α) ² + (y · α) ² + (z · α) ² }
θx ′ = arcsin {(x · α) / A ′ ² } = arcsin (x / A) = θx,
It can be seen that the influence of the sensitivity change is canceled.

When the offset amount is Δ, the equation (4) is
A ′ = √ {(x + Δ) ² + (y + Δ) ² + (z + Δ) ² }
If A is stored in advance, the offset amount β = (A′−A) / √3 for each axis can be obtained by substituting this into equation (1).
θx ′ = arcsin {(x′−β) / A ² } = arcsin (x / A) = θx,
It can be seen that the effect of the offset is cancelled. Here, x ′ = x + β.

  Similarly, since the influence of slightly different gravity depending on the measurement location is also cancelled, according to the above method, the inclination of the triaxial acceleration sensor 70 can be specified with very high accuracy. This is not only useful when the sensor units 2, 2,... Are installed as described above, but even if the building 1 or the like is inclined with time and the Z axis of the sensor 70 is deviated from the vertical direction, Since the deviation can be accurately detected and corrected, the seismic motion can be accurately detected separately in the vertical and horizontal directions, which is advantageous for three-dimensional analysis of the shaking caused by the earthquake. Further, as will be described later, the inclination of a building or the like can be detected immediately after the occurrence of an earthquake.

  By the way, when installing a plurality (three in the illustrated example) of sensor units 2, 2,... In the same building 1 as shown in FIG. 1, the time between these sensor units 2, 2,. It is necessary to synchronize the axes and adjust the timing of the sampling time. Therefore, for example, a notebook personal computer or the like is placed near one of the sensor units 2 (for example, the one on the first floor), a synchronization command is sent to the PDA 8 by wireless communication, and a plurality of sensor units 2, 2,. Are synchronized with each other.

  That is, as shown in the flow of FIG. 5, when the PDA 8 of each sensor unit 2 receives the synchronization command (YES in step S1: synchronization start command?), The time synchronization program is started, and the process proceeds to step S2. It is determined whether the output side. Then, the sensor unit 2 on the output side determines YES and proceeds to step S3, sets the input / output terminal 79 of the acceleration sensor module 7 to the output side, and outputs a synchronization trigger pulse which is a signal for time synchronization. Then, the counter 73 is reset and the process proceeds to step S4, where a synchronization success flag is transmitted to the notebook computer or the like, and the process returns.

  On the other hand, in the remaining two sensor units 2, 2,... That are determined not to be the signal output side (NO) in step S2, the process proceeds to step S5 and the input / output terminal 79 of the acceleration sensor module 7 is set to the input side. Set and wait for input of synchronization trigger pulse. If a synchronization trigger pulse is input, the counter 73 is reset, and it is determined in step S6 that the synchronization is successful (YES), and the process proceeds to step S4. In step S6, it is determined that the synchronization is not successful (NO), the process proceeds to step S7, the synchronization failure flag is transmitted, and then the process returns.

  In this way, the time axes of all the sensor units 2, 2,... Are synchronized, and all the sampling timings are synchronized, so that it is possible to guarantee the sampling time and the absence of sampling data. Since it is connected by a signal line, it can be accurately synchronized unlike the case of wireless communication, and even if it is connected in parallel, it can be connected in a daisy chain to reduce wiring. In addition, it is not necessary to individually set for the trigger output or reception of the synchronization signal individually. The number of sensor units 2, 2,... To be synchronized may be two, or four or more.

  If such time synchronization adjustment is performed when the sensor units 2, 2,... Are installed, the sensor units 2, 2,. The time axis is maintained substantially the same. However, since the reference clock 74 may be shifted little by little, the time synchronization may be adjusted every certain period (for example, 2 to 3 years) depending on the required synchronization accuracy. The time synchronization program corresponds to the synchronization signal output means and the clock value reset means.

−Measurement of earthquake motion and data collection−
Next, the procedure for measuring the earthquake motion using the sensor units 2, 2,... Installed in the buildings 1, 1,. First, when the buildings 1, 1, etc. where the sensor units 2, 2,... Are greatly shaken by a predetermined amount or more due to an earthquake, as shown at time t 1 in FIG. The magnitude of the AC component of the X, Y, or Z axial output from the triaxial acceleration sensor 70 exceeds a predetermined threshold (trigger level).

  This triggers the MPU 71 to transmit acceleration data to the PDA 8 until a predetermined time elapses from a time point t0 that is a predetermined time retroactive from that time (seismic motion measurement date and time). Then, the MPU 71 switches the semiconductor switch 72b of the signal processing circuit 72, and this time takes in the DC component of the output for each axis X, Y, Z of the acceleration sensor 70, and the output fluctuations after a preset time has passed. Is reduced (time t3), DC component data x, y, z for each axis so far are transmitted to the PDA 8 (time t4). Thereafter, the MPU 71 switches the signal processing circuit 72 to the AC side again.

  Each of the AC component and DC component data is transmitted for each of the X, Y, and Z axes. At this time, a counter value (time value) indicating the date and time of measurement is also transmitted. Based on this counter value, the time axis of the data from the plurality of sensor units 2, 2,.

  As described above, the PDA 8 that has received the data transmission of the AC component and the DC component temporarily stores the received acceleration data in the memory and activates the analysis calculation program to execute the FFT processing on the AC component data. . As an example, the upper side of FIG. 7 shows data representing the time change of the measured values of the acceleration (alternating current component) on each of the X, Y, and Z axes, and the lower side represents the frequency characteristics after the FFT processing. Data is shown. The peak value of acceleration (representing the magnitude of an earthquake) and the peak frequency (representing the resonance frequency of a building or the like) are obtained by the FFT process, and these are indicators of the degree of damage of the building or the like 1.

  In the PDA 8, the CPU activates the tilt angle calculation program, and the tilt of each axis from the vertical direction based on the DC component data for each of the three axes, as in the case of installing the sensor units 2, 2,. Calculate the corner. As a result, the seismic motion can be accurately detected separately in the vertical and horizontal directions, and the inclination of the building or the like due to the earthquake can also be detected.

  The PDA 8 that has acquired the acceleration data indicating the intensity of the earthquake motion and the data relating to the inclination of the building, etc. starts the transmission program and transmits data from the sensor unit 2 to the server 3 as shown in FIG. Do. The data includes, for example, the acceleration data after the FFT processing, the inclination data of the building, and the measurement time of the earthquake motion, for example, the ID information of the corresponding wireless IC tag 9, the physical address of the acceleration sensor module 7, etc. It is included. The physical address is unique to the acceleration sensor module 7 and is also called a MAC address.

Then, the server 3 that has received the data transmission from the PDA 8 verifies the physical address with reference to the terminal information DB (see FIG. 12B) of the external storage device 30. Information is recorded in the acceleration data information DB in association with ID information and the like, and a data storage success flag is returned to the PDA 8 of the sensor unit 2. In this way, the acceleration data information DB stores acceleration data information such as the acceleration waveform, peak value, and peak frequency after the FFT processing shown on the lower side of FIG. 7 in association with ID information and the like along with the measurement date and time. The In addition, information on the inclination of buildings, etc.
If there is no reply from the server 3 even after a predetermined time elapses due to, for example, maintenance of the server 3, connection abnormality, communication network abnormality, etc. (data transmission timeout), it is repeated a predetermined number of times. For example, as shown in FIG. 4B, data can be attached to an electronic mail and transmitted via the mail server 3 ′. Of course, another server computer for assisting the server 3 may be provided in advance, or the data may be temporarily stored in the storage device of the PDA 8 and sent together with newly acquired data later.

-Inspection of damage caused by earthquake-
The information stored in the database of the server 3 as described above can be browsed through the Internet as described above, and can be easily used by the PDA 5 carried by the inspector M who went to the disaster area after the earthquake. . Hereinafter, a procedure for acquiring information from the server 3 by the PDA 5 will be described more specifically with reference to FIGS. 10 to 12 based on FIG. 9 showing a signal flow.

  First, FIG. 10A shows a login screen displayed on the display 5 a of the PDA 5. The login screen is displayed when a predetermined operation is performed on the operation unit 5b of the PDA 5, and includes two operation buttons as illustrated. The inspector M inputs the user ID and password, which is his own ID information, or presses the “read” button to input the user ID after reading the user ID from the wireless IC tag 9 ′ worn, Then press the “Login” button.

  Then, as schematically shown in FIG. 9, the user ID and password are transmitted from the PDA 5 to the server 3, and the server 3 that has received this verifies the user ID and password with reference to the user information DB, and then OK. If there is, a login success flag is returned to the PDA 5 to give login permission. Then, a screen as shown in FIG. 10B is displayed on the display of the PDA 5. When the PDA 5 is held close to the sensor unit 2 while pressing the “read” button on this screen, the reader / writer 10 ID information is read from the wireless IC tag 9 (building installation ID acquisition).

  Next, when the inspector M presses the “connect” button on the screen, the building installation ID acquired as described above is transmitted to the server 3 together with a request signal for requesting acceleration data information and the like. In response to this, the server 3 searches and extracts all the sensor units 2, 2,... Installed in the building 1 identified from the building installation ID, and then refers to the acceleration data information DB, the building information DB, etc. In addition to the acceleration data information of each sensor unit 2, for example, all the predetermined information related to the user and the building, such as building information, accompanying information, terminal information, login user information, and the like is transmitted to the PDA 5.

  All the information thus sent is switched and displayed on the display 5a when the inspector M operates the operation unit 5b of the PDA 5. As the acceleration data information, for example, data representing the frequency characteristics of FIG. 7 is displayed, and as the building information, the structure of the building 1 and the completion date are displayed as shown in FIG. As shown in FIG. 5B, the arrangement of the sensor unit 2 in the interior of the building 1 is displayed. The user information and terminal information are illustrated in FIGS. 12 (a) and 12 (b), respectively.

  From the acceleration data information, the inspector can quantitatively grasp the magnitude of the earthquake motion and the magnitude of the shaking of the building 1 and the like, and know the structure and age of the building 1 that is difficult to understand from the exterior from the building information. be able to. In particular, as shown in FIG. 1, when sensor units 2, 2,... Are installed on the first floor, the fifth floor, and the tenth floor of the building 1, etc., and all of the acceleration data information is sent, In combination, for example, the vibration transfer characteristics of the building 1 and the like can be obtained from the time lags at which the accelerations have peak values on the first floor and the fifth floor, for example, and it is also possible to determine the degree of damage.

  In addition, as described later, the acceleration data measured by the sensor units 2, 2,... May be added to either the acceleration data information or the building information by forcibly exciting the building 1 or the like as will be described later. . In this way, the vibration transfer characteristics of the building 1 before being damaged by the earthquake can be understood, and by comparison with this, it is possible to know how the vibration transfer characteristics of the building 1 have changed due to the earthquake. This is also advantageous in determining the degree of damage to the building 1 or the like.

  Then, the inspector M operates the operation unit 5b of the PDA 5 and can input the result of the inspection performed by the inspector M. Although illustration is omitted, for example, a screen for prompting input for each inspection item set in advance on the display 5a is displayed, and input may be made interactively in accordance with this screen. Then, in response to a predetermined operation of the inspector M, the inspection information transmission program of the PDA 5 is activated, and the information of the inspection result is transmitted to the server 3 together with the ID information read from the wireless IC tag 9.

  Therefore, according to the seismic motion monitoring system S according to the first embodiment, when an earthquake occurs and the buildings 1, 1, etc. are shaken, the vibration state due to this is detected by the sensor units 2, 2,. Then, it is transmitted to the server 3 via wireless communication. At this time, communications from a very large number of sensor units 2, 2,... Installed in a large number of buildings 1, 1,... Are concentrated on the server 3. In this embodiment, from the acceleration sensor 70. Since the predetermined amount of data is added to the signal to reduce the amount of data and only the processed data is transmitted to the server 3, the server 3 does not fall into an incapable processing state.

  Further, the acceleration data information collected in the server 3 and recorded in the database can be easily acquired by the PDA 5 carried by the inspector M who went to the disaster area. At this time, the server 3 provides not only the acceleration data information but also a lot of information useful for determining the damage status of the building 1 such as building information and its accompanying information. Even an inspector M who is shallow and not very skilled can grasp the damage status of the building 1 or the like due to the earthquake and accurately predict the risk of collapse.

  If the inspector M inputs the result of the inspection performed in this way to the PDA 5, it can be transmitted from the PDA 5 to the server 3 by wireless communication and stored in the inspection information DB for each inspection item. By doing so, there is no worry that a plurality of inspectors M, M,...

(Embodiment 2)
Next, FIG. 13 shows a case where the monitoring system according to the present invention is used for confirming the effect of so-called seismic reinforcement. The basic configuration of the sensor units 2, 2,... Used in this system is the same as that of the first embodiment.

  In the monitoring system of this embodiment, a plurality of sensor units 2, 2,... Are installed in a building or the like as in the first embodiment, and information about acceleration and inclination detected by each is wirelessly communicated with the computer device 12 (shown in the figure). In the example, it is a notebook personal computer, hereinafter referred to as PC12), displayed on the inspector M who is a user, and stored in a database provided in the internal storage device of PC12 (not shown). is there.

  In the example shown in the figure, the PC 12 is connected to the sensor units 2, 2,. The PC 12 may be connected via the Internet as in the first embodiment. The computer apparatus is not limited to a personal computer, and the PDAs 5 and 8 of the first embodiment can be used.

  In this embodiment, the wireless IC tags 9, 9,... Are not necessarily required for the sensor units 2, 2,..., But the wireless IC tags 9, 9,. Also good. In addition, the internal storage device of the PDA 8 of each sensor unit 2 stores an analysis calculation program, an inclination angle calculation program, and a transmission program as in the first embodiment, and a command transmitted from the PC 12 by wireless communication as described above. A data acquisition program for acquiring an output from the triaxial acceleration sensor 70 for a predetermined period in response to (command) is also stored.

  When the CPU executes the data acquisition program, the PDA 8 includes an acceleration data acquisition unit. In this embodiment, the transmission program transmits data calculated using the analysis calculation program or the tilt angle calculation program to the PC 12, and the transmission program is transmitted by the acceleration data acquisition means. This corresponds to data transmission means for transmitting the acquired acceleration data to the computer apparatus by wireless communication.

  In the following, the procedure of processing performed by the PDA 8 will be described in detail with reference to the flow of FIG. 14. First, in step T1, waiting for input of commands such as setting change and calibration value request from the PC 12, and if there is input (YES) Proceeding to step T2, instructions corresponding to them are transmitted to the sensor module 7. In response to this, in the sensor module 7, the MPU 71 changes the setting value of the EEPROM, that is, the AC / DC switching of the signal processing circuit 72, the gain control value of the variable gain amplifier 72c, or the triaxial acceleration according to the contents of the command. The calibration value data of the sensor 70 is read and transmitted to the PDA 8.

  Here, as is well known, the calibration value is a coefficient value for converting an integer data value output from the acceleration sensor 70 into a data value of a predetermined unit including a decimal point (for example, gal), and has been previously tested. The optimum value specified based on the above is stored in the EEPROM which is the calibration value storage means. If acceleration data (integer data value) is converted into a decimal value such as float or doubule using this calibration value, the amount of data increases several times. In this embodiment, conversion is not performed before communication. A calibration value for conversion is transmitted to the PDA 8 together with the data value, and further transmitted to the PC 12 for conversion. As a result, communication charges are overwhelmingly reduced and real-time processing becomes possible.

  That is, in step T3 following step T2, the PDA 8 determines whether a calibration value has been received from the sensor module 7, and if received (YES), proceeds to step T4 and transmits the calibration value to the PC 12. Subsequently, the PDA 8 waits for an input of a command related to data measurement, that is, a sampling start command from the PC 12, and if there is an input (YES in Step T5), the PDA 8 proceeds to Step T6 and transmits a sampling start command to the sensor module 7.

  Here, although schematically shown by a white arrow in FIG. 13, the building 1 or the like is vibrated with a vibrator (not shown). Then, in the sensor module 7 that has received the sampling start command, the AC component of the output from the triaxial acceleration sensor 70 is taken into the MPU 71 as in the first embodiment described above, and is stored in the PDA 8 as acceleration data at predetermined time intervals. Sent.

  Then, the PDA 8 to which the acceleration data is transmitted determines whether or not the data has been received in Step T7 following Step T6. If received (YES), the process proceeds to Step T8, and this data is transmitted to the PC 12. In the subsequent step T9, the input of a sampling stop command from the PC 12 is awaited. If there is an input (YES), the process proceeds to step T10 and a sampling stop command is transmitted to the sensor module 7.

  Thus, according to the system of the second embodiment, for example, in order to confirm the effect of seismic reinforcement, the building 1 or the like is vibrated and the time synchronization from the sensor units 2, 2,. The acceleration data thus transmitted can be transmitted to the PC 12, and the waveform display and analysis display with the time axis aligned in real time are possible. In addition, it is possible to accurately determine a point requiring reinforcement of the building 1 or the like two-dimensionally or three-dimensionally, and to keep the time and cost for reinforcement low.

  Moreover, unlike the wired type, the time and cost required for installing the sensor units 2, 2,... Can be greatly reduced, and the installation location can be changed easily. In addition, there is also an advantage that it is possible to easily cope with the case where data is once acquired and browsed and analyzed to identify a point requiring reinforcement with large vibration.

(Other embodiments)
Note that the configuration of the monitoring system of the present invention is not limited to those of the first and second embodiments, and includes other various configurations. For example, in the above embodiment, the sensor unit 2 includes the acceleration sensor module 7 and the PDA 8, but the CPU of the acceleration sensor module 7 has a high performance, expands the capacity of the storage device, etc. If incorporated, this makes it possible to replace the PDA 8 and omit it.

  In addition, the acceleration sensor module 7 of the embodiment includes the signal processing circuit 72 separately from the MPU 71, but the functions of the semiconductor switch 72b, the variable gain amplifier 72c, etc. may be built in the programmable MPU. it can.

  The acceleration sensor module 7 does not necessarily need to use the three-axis acceleration sensor 70. For example, a single-axis acceleration sensor can be provided so as to detect only vibrations in the vertical direction. It is also possible to use a speed sensor.

  Further, the sensor unit 2 does not necessarily have to include the wireless IC tag 9. For example, the sensor unit 2 may be provided with a bar code that records ID information. Information may be displayed and the inspector M may manually input the information.

  In addition, the sensor unit 2 may include a camera that records an image of a building 1 or the like. In this case, when the magnitude of the AC component of any one of the axial outputs of the acceleration sensor 70 exceeds the trigger level (time t1 in FIG. 6), the recording by the camera is started, and the recording until a predetermined time later is performed. The data may be acquired and the recorded data may be transmitted to the server 3 together with the acceleration data. In this way, it is possible to predict the risk of collapse more accurately by adding a recorded image at the time of the earthquake.

  Furthermore, the sensor unit 2 or the acceleration sensor module 7 of the above-described embodiment can be used for purposes other than the confirmation of seismic reinforcement such as the monitoring system S for seismic motion as in the first embodiment and the second embodiment.

  The monitoring system according to the present invention is applied to buildings, bridges, etc., and provides a useful method for quickly and accurately judging the damage caused by an earthquake, and is extremely useful for uses such as disaster prevention and safety. Is.

It is a schematic block diagram of the seismic-motion monitoring system which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of a sensor unit. It is explanatory drawing which shows the mode of communication with PDA and a radio | wireless IC tag. It is a schematic diagram which concerns on the calculation of the inclination of an acceleration sensor. It is a figure which shows an example of the processing flow for time synchronization. It is a time chart figure concerning the measurement of acceleration. It is a figure which shows an example of acceleration data. It is explanatory drawing which shows the flow of the signal at the time of transmitting acceleration data to a server from a sensor unit. It is explanatory drawing which shows the flow of a signal at the time of acquiring information, such as acceleration data, from a server by PDA. It is explanatory drawing which shows the example of a display of the login screen of PDA. It is explanatory drawing which shows the example of a display of the building information. It is explanatory drawing which shows the example of a display of the same user information. FIG. 3 is a view corresponding to FIG. 1 according to a second embodiment. It is a figure which shows an example of the processing flow for confirmation of earthquake-proof reinforcement.

Claims (16)

A sensor unit is installed in a building or civil engineering structure, and vibration information relating to the detected vibration state is transmitted to a server computer by wireless communication, and recorded in a vibration database in association with ID information unique to the sensor unit. Monitoring system
It is possible to connect to the server computer by wireless communication, and includes a portable terminal that transmits a request signal for requesting the vibration information according to a predetermined operation of a user to the server computer together with ID information,
The server computer has information providing means for receiving the request signal, reading vibration information related to the corresponding ID information from the vibration database, and transmitting it to the portable terminal;
The portable terminal is
ID information acquisition means for acquiring ID information by wireless communication from the sensor unit;
Vibration information requesting means for transmitting a request signal to the server computer together with the acquired ID information;
Vibration information display means for receiving vibration information transmitted from the server computer that has received the request signal and displaying it to the user;
A monitoring system characterized by comprising: The server computer has a building database in which information on the building or civil structure where the sensor unit is installed is recorded.
2. The monitoring system according to claim 1, wherein the information providing unit transmits information including the information on the building or the civil engineering structure when transmitting vibration information related to the sensor unit to the portable terminal in response to the request signal. The server computer is configured to record vibration information related to the plurality of sensor units in a vibration database in association with each other when the plurality of sensor units are installed in the same building or civil engineering structure,
The information providing means transmits the vibration information related to any one of the plurality of sensor units, including vibration information related to other associated sensor units, when transmitting the vibration information to the portable terminal. The monitoring system according to any one of the above. The sensor unit
It has a clock means capable of setting the time, adds the time information by this clock means to the vibration information and transmits it to the server computer,
An input / output port that can be switched to the input side and output side of the synchronization signal;
Synchronization signal output means for outputting a synchronization signal from the input / output port switched to the output side;
4. The monitoring system according to claim 1, further comprising: time value resetting means for receiving the synchronization signal at the input / output port switched to the input side and resetting the timekeeping value of the clock means. . The sensor unit includes a wireless IC tag that records ID information.
The monitoring system according to any one of claims 1 to 4, wherein ID information acquisition means of the mobile terminal acquires ID information from the wireless IC tag. The mobile terminal has inspection information transmission means for transmitting inspection information about a building or a civil engineering structure input by a predetermined operation of the user to the server computer together with ID information acquired from the wireless IC tag,
The monitoring system according to claim 5, wherein the server computer records the inspection information in an inspection information database in association with ID information.   The monitoring unit according to claim 1, wherein the sensor unit includes an analysis calculation unit that performs FFT processing on vibration data detected by the sensor, and transmits only the analyzed data to the server computer. system.   The sensor unit has an acceleration sensor and signal processing means for separating the output into an alternating current component and a direct current component and performing signal processing by switching to either of them, and vibration relating to a vibration state detected based on the alternating current component The monitoring system according to claim 1, wherein the information is transmitted to a server computer.   The monitoring system according to claim 8, wherein the sensor unit detects the inclination state of the building or the civil engineering structure based on the DC component of the output of the acceleration sensor, and transmits the detected value to the server computer together with the vibration information. The sensor unit is provided with a triaxial acceleration sensor capable of detecting acceleration in each direction of three orthogonal axes.
The signal processing means separates the output for each axis of the triaxial acceleration sensor into an AC component and a DC component,
Furthermore, the inclination angle calculation means which calculates the inclination angle from the vertical direction of each axis | shaft based on only the direct current component of the output of each said 3 axis | shafts irrespective of the value of gravity acceleration is provided. Monitoring system.   The sensor unit detects a vibration state based on the AC component up to a predetermined time when the amplitude of the AC component of any axis output of the acceleration sensor exceeds a predetermined threshold, and then switches to the DC component. 11. The monitoring system according to claim 10, wherein an inclination angle from the vertical direction of each axis is calculated by an inclination angle calculating means based on an average value of DC components for each axis until a predetermined time later.   The sensor unit is equipped with a camera that records an image of a building or a civil engineering structure. When the amplitude of the alternating current component of the output of the acceleration sensor exceeds a predetermined threshold, recording by the camera is started until a predetermined time later. The monitoring system according to claim 8, wherein the recorded data is acquired and transmitted to the server computer together with the vibration information. Monitoring in which multiple sensor units are installed in a building or civil engineering structure, and information on the vibration or tilt state detected by each sensor unit is transmitted to a computer device by wireless communication, displayed to the user, and recorded in a database A system,
In each of the plurality of sensor units,
An acceleration sensor;
Acceleration data acquisition means for receiving an operation command transmitted from the computer device by wireless communication and acquiring an output from the acceleration sensor for a predetermined period;
Data transmission means for transmitting acceleration data acquired by the acceleration data acquisition means to a computer device by wireless communication;
A monitoring system characterized by comprising: The sensor unit has calibration value storage means for storing a calibration value for converting an integer data value output from the acceleration sensor into a data value of a predetermined unit including a decimal point,
14. The monitoring system according to claim 13, wherein the data transmission means adds the calibration value to the integer data value that is acceleration data and transmits the data to a server computer. A triaxial acceleration sensor capable of detecting acceleration in each direction of three axes orthogonal to each other;
Signal processing means for separating the output of each axis of the three-axis acceleration sensor into an AC component and a DC component;
A sensor unit comprising: an inclination angle calculating means for calculating an inclination angle from the vertical direction of each axis regardless of a value of gravitational acceleration based only on a direct current component of each of the three axes.   The sensor unit according to claim 15, wherein the inclination angle calculation unit corrects variations in sensitivity and offset of the sensor due to a temperature change based on a value of a gravity vector synthesized from an output of the triaxial acceleration sensor.