JP3777453B2 - Structure monitoring system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure monitoring system, and more particularly to a structure monitoring system that can be remotely monitored.
[0002]
[Prior art]
Structures are subject to damage such as cracks, corrosion holes, delamination and deformation due to fatigue due to repeated loads, corrosion due to corrosive environments, impact loads resulting from collision accidents, and excessive loads resulting from natural disasters such as earthquakes and gusts. Arise. Therefore, it is necessary to carry out damage inspection periodically or as necessary to ensure the safety and function of the structure.
[0003]
However, this inspection was performed visually or using a device by a qualified person who received advanced technical training. In addition, when inspecting equipment, the equipment to be inspected must be stopped. Therefore, the cost required for the inspection is high both in terms of time and cost. In addition, there is a risk that the inspection involves risks to the measurer such as work at a high place and radiation exposure. Furthermore, it was difficult to carry out the inspection quickly in an emergency such as an earthquake. In order to solve the above-described problems, many systems have been proposed in which a sensor is attached to a measurement target and a structure is inspected for damage.
[0004]
(1) Regarding the detection of fatigue cracks occurring in structural material members, in Japanese Laid-Open Patent Publication No. 10-185854, a fatigue crack detection sensor is attached to a structural material member, and sampling is performed at regular intervals. Systems have been proposed that detect the occurrence of fatigue cracks when exceeded. This system is excellent in predicting the occurrence of fatigue cracks, but it cannot be applied to deformation due to unexpected loads such as impact loads and earthquakes, separation of composite materials and adhesive joint structures, and corrosion. Further, in the case of a huge structure, an enormous number of sensors are required, so that the routing of analog lead wires connected to the sensors becomes a problem.
[0005]
(2) Regarding a system for detecting deformation of a structure, in JP-A-10-318725, an optical fiber is attached to the inside of the tunnel, and the deformation of the structure is detected by comparing the difference in light propagation intensity. A system has been proposed. Although this system has an advantage of avoiding troublesome wiring by using an optical fiber, since the optical fiber cannot measure strain unless an external force is applied, it is not suitable for inspection of a general structure. Moreover, since it is necessary to obtain in advance the relationship between the change in light intensity and strain and the relationship between strain and damage, it is difficult to apply to a giant structure.
[0006]
(3) Regarding a system for detecting an abnormality of a structure, in Japanese Laid-Open Patent Publication No. 10-274603, a flat sensor is arranged on a support portion of the structure to detect a displacement of the structure caused by an earthquake or a typhoon. A system has been proposed. However, this system has problems such as a huge installation cost to apply to a structure that has already been constructed, and only a positional shift is detected.
[0007]
(4) Regarding a system for detecting damage to a building during a natural disaster such as an earthquake, in Japanese Laid-Open Patent Publication No. 11-44615, a seismometer record is collected using a computer network in the building, and a change in natural frequency is detected. Systems for detecting building damage have been proposed. This system is advantageous in that a huge amount of analog wiring is not required by using a computer network in the building. Moreover, since damage is detected by a change in natural frequency, damage can be detected with a small number of sensors. However, there are problems such as that it is necessary to install the computer on an earthquake-resistant structure and that it is difficult to detect damage in the abdominal part of the vibration mode that is difficult to detect only by the natural frequency.
[0008]
(5) With regard to a structure monitoring apparatus, Japanese Patent Application Laid-Open No. 6-194275 has proposed a monitoring apparatus in which a sensor, an arithmetic processing unit, and a transmission / reception apparatus are integrated. This device can be easily attached to a structure, but it is subject to restrictions on sensor placement, is susceptible to radio interference by using wireless, and there is no part to determine damage from the measurement results. There is a problem.
[0009]
(6) Regarding management systems for network connection devices such as printers and personal computers, the following information is disclosed in JP-A-6-2222956, JP-A-10-97444, JP-A-10-173655, and JP-A-9-134297. A system has been proposed in which a host CPU that monitors an abnormality of a network connection device transmits an e-mail to an administrator when an abnormality occurs.
[0010]
Japanese Laid-Open Patent Publication No. 11-234271 proposes a remote monitoring system for network connection devices based on the HTTP protocol used for homepages.
[0011]
However, these systems do not mention abnormality detection of a device structure that is not connected to a network. In addition, sensor information is usually enormous data, but transfer of such enormous data has not been studied.
[0012]
(7) Regarding a remote monitoring system for a plant or the like, in Japanese Patent Application Laid-Open No. 11-252670, a system in which a sensor is connected to an intranet in a factory with a small terminal and monitoring information is transmitted to an administrator by HTML format data or e-mail. Has been proposed. This system is epoch-making when compared with conventional visual inspection and monitoring by sensor connection using analog lead wires. However, the sensor information is monitored by analog processing with amplifiers, filters, and waveform processing, and the results are compared and digitized by a comparator. There is a problem that a simple determination method cannot be adopted and that it is difficult to use for monitoring a complicated structure.
[0013]
Japanese Laid-Open Patent Publication No. 11-146466 has proposed a system for monitoring a plant from a remote location using HTML format data provided from a WWW server. This system has problems such as that the communication method is limited to a method using WWW and that a monitor is required because data is only displayed in real time.
[0014]
(8) Regarding an analyzer from a remote location, in Japanese Patent Application Laid-Open No. 2000-28617, a detector that detects an analysis object and outputs a detection value, a predetermined analysis program, and a digital communication means such as the Internet An analysis system consisting of a computer equipped with is proposed. This system is a system for notifying an administrator by displaying an analysis result and an analysis condition by an analysis program on a home page created by a WWW editing program or by transmitting the result by electronic mail. However, this system does not start analysis unless the analyst actively takes actions such as mouse operations or requests to the server, does not have a program to constantly monitor, and does not have a function to check for sensor failures. There is a problem that there is no function for reconfirming sensor information.
[0015]
[Problems to be solved by the invention]
  However, in the above-described conventional technology, the administrator cannot control the measurement conditions of the sensor by remote operation or check the sensor for failure. Therefore, the administrator can remotely monitor the structure damage in detail.could not.
[0016]
  The present invention has been made to solve these problems, and provides a structure monitoring system capable of remotely monitoring a structure damage in detail.Objective.
[0017]
[Means for Solving the Problems]
  The present invention is attached to a structure.pluralA sensor;pluralSensorEach ofA monitoring system for a structure composed of a measurement computer to which measurement information is input from, and an administrator computer connected to the measurement computer via the Internet, wherein the measurement computer includes the measurement computerpluralSensorEach ofFromEnteredAn A / D conversion function for converting measurement information into a digital signal; a data processing function for creating measurement data from the digital signal;From each of multiple sensorsmeasurement dataWhen, When the structure is healthyMeasurement atThe response surface is significantly different from the data, and the structure is abnormal when the response surface equivalence test is statistically rejected.When has occurredJudgmentByA damage determination function for detecting damage to the structure; a remote transmission / reception function for transmitting a determination result of damage to the structure to the administrator computer; and receiving a command from the administrator computer; and the administrator computer And a measurement condition control function for controlling the measurement conditions of the sensor in accordance with a command from
  The measurement computer includes the A / D conversion function, the data processing function, and the measurement condition control function,pluralA first computer connected to a sensor and a second computer having the damage determination function and the remote transmission / reception function, and the first computer and the second computer are connected via Ethernet It was.
[0018]
[Action]
Measurement information detected by a sensor attached to the structure is input to a measurement computer connected to the sensor. In the measurement computer, the measurement information is converted into a digital signal by the A / D conversion function, and the digital signal is subjected to data processing such as noise removal and smoothing by the data processing function to create measurement data. Then, the damage is automatically determined from the measurement data by the damage determination function, and the determination result is notified to the administrator computer by the remote transmission / reception function. The administrator uses the remote transmission / reception function to send a command to the measurement condition control function periodically or as needed to control the measurement conditions of the sensor. The sensor and the first computer of the measurement computer are connected by an analog lead wire, and the first computer and the second computer of the measurement computer are connected by Ethernet.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The structure of the structure damage monitoring system of the present invention will be described by taking a bridge structure damage monitoring system as an example. Figure 1 shows a damage monitoring system for bridge structures.
[0020]
As shown in FIG. 1, a plurality of sensors 2 are attached to a bridge partial structure 1, and the sensors 2 are connected to a measurement computer 4 by analog lead wires 3. The measurement computer 4 includes a small smart terminal 5 attached to the partial structure 1 and connected to the sensor 2, and a determination partial computer 6 disposed at a location away from the partial structure 1, and includes the small smart terminal 5 and the determination partial computer 6. Are connected by an Ethernet cable 7. The determination partial computer 6 is connected to an administrator computer 8 that is remotely located by an Internet line 9.
[0021]
The measurement computer 4 determines whether the partial structure 1 is damaged from the measurement information input from the sensor 2 and notifies the administrator computer 8 of the determination result via the Internet line 9. Then, the administrator computer 8 issues a command for controlling the measurement conditions of the sensor 2 to the measurement computer 4 periodically or as necessary, and monitors the details of damage to the partial structure 1. Sensor 2 is a vibration measurement sensor., HiStrain gauge,Accelerometer,Vibration sensorWhoUsed.
[0022]
A detailed configuration of the measurement computer 4 is shown in FIG. As shown in FIG. 2, the small smart terminal 5 includes an A / D conversion function 10, a data processing function 11, and a measurement condition control function 12. Measurement information input from the sensor 2 to the small smart terminal 5 is first converted into a digital signal by the A / D conversion function 10. Next, the converted digital signal is processed by the data processing function 11 to create measurement data. Then, the measurement data is transmitted to the measurement partial computer 6 via the Ethernet cable 7. In addition, when there is a command from the administrator computer 8, the measurement condition control function 12 controls the measurement time and measurement interval of the sensor 2 according to the command.
[0023]
The determination partial computer 6 includes a damage determination function 13 and a remote transmission / reception function 14. The damage determination function 13 determines damage of the partial structure 1 from the measurement data transmitted from the small smart terminal 5. Then, the remote transmission / reception function 14 transmits the determination result of the damage of the partial structure 1 to the administrator computer 8. The remote transmission / reception function 14 is an administrator computer 8.MeasurementFor constant condition control function 12Issued againstReceive instructions.
[0024]
The number of Ethernet cables 7 that connect the small smart terminal 5 and the judgment partial computer 6 is appropriate as necessary.SpecialDetermine. For example,In order to sufficiently ensure the reliability of the damage monitoring system at the time of a large-scale disaster such as an earthquake, a plurality of Ethernet cables 7 are preferably provided. IP( Internet Protocol )RIP is a dynamic routing service( Routing Information Protocol )It is more preferable that the service is set so that the network failure is automatically avoided and the data is reliably transmitted to the determination partial computer 6. In an environment where wireless communication can be used, wireless LAN devices must be connected.By using,Between the small smart terminal 5 and the judgment partial computer 6Ethernet wiring can also be omitted.
[0025]
Next, a method for determining bridge damage will be described. For damage to bridges,Destruction, deformation, contactThere are fatigue cracks at joints. Also,Installed on the bridgeThe health of accessories such as telephones is also subject to damage monitoring.
[0026]
When judging destruction due to excessive load,in advance,By structural analysisRiyoMeasured dangerous load as thresholdAside,Used as sensor 2When the vibration data detected by the vibration sensor exceeds this threshold, it is determined that the bridge has been damaged.
[0027]
When judging the deformation of the bridge, the change in the natural frequency of the bridge is measured by a vibration sensor, and the deformation of the bridge is judged by statistically processing the measured value. More specifically, the natural frequency when the bridge is healthy is measured a plurality of times (m times), and the average value ωm and standard deviation σ of the natural frequency are obtained in advance. In addition, an average value of natural frequencies obtained by measuring a plurality of times (n times, n <m) during damage monitoring is defined as ωn. If all measured values follow a normal distribution, the null hypothesis that the average difference (ωm−ωn) is 0 (the hypothesis that there is no difference) is rejected with 95% confidence. , Statistic z [(ωm−ωn) / {σ√ (1 / m) + 1 / n)}] is a t value which is a value of a t distribution (α = 0.025) with p = n + m−2 degrees of freedom. Is also a condition. That is, when the statistic z is larger than the t value of the t distribution, it is determined that there is a statistical difference. This does not immediately indicate that there is a physical difference, but it is a powerful indicator for judging bridge deformation. Note that the value of α can be changed as necessary.
[0028]
When judging the occurrence of fatigue cracks,2In addition, a lightweight sensor such as a PVDF piezoelectric film or a strain gauge is used.For sensor 2A case where a fatigue crack of a flat bolt joint subjected to a tensile force using a strain gauge is determined will be described as an example. Note that the tensile force is completely within the elastic range. When there is no crack in the bolt, it is elastically deformed, so if the external force is proportional load,eachThe strain outputs ε are proportional to each other regardless of the magnitude of the external force. That is, the i-th strain output εi and the j-th strain output εj have a relationship of εi = βij × εj (βij is a proportional constant). Therefore, it is possible to create a response surface between two strain gauges under various proportional load external forces, and to determine the occurrence of a crack by a significant difference test of the equivalence of the response surfaces.
[0029]
  In addition, if response surfaces between all strain gauges are tested and equivalence is rejected only when a specific number of gauges is involved, it is possible that a crack has occurred at the location where the gauge is attached. I understand. Specifically, when the strain gauges are ε1 and ε2, measurement is performed n1 times without damage, and a coefficient of ε1 = β0 + β12 × ε2 is obtained by the least square method. Then, after the start of monitoring, n2 measurements are performed to obtain a coefficient of ε1 = B0 + B12 × ε2. The equivalence test of these two straight lines may be performed by testing the null hypothesis of β0 = B0 and β12 = B12. In this case, the statistic W = {(SSE0 / SSE12-1) (n'-2p ') /p '} Follows the F distribution, the hypothesis is rejected and equivalence is rejected when it exceeds F (α, n ′, n′−2p ′). SSE0 is the error sum of squares obtained from the group of n1 and n2, and n ′ = n1 + n2, p ′ = response surface coefficient + 1, SSE12 =SSE1 + SSE2It is. SSE1 is the error sum of squares of n1, and SSE2 is the error sum of squares of n1.Here, a response surface is an approximate function (what is a straight line or a polynomial?) That approximates the objective (response) at a plurality of discrete data points with a continuous surface in order to obtain the influence of the variable on the objective (response). (Not limited). It is usually used in conjunction with experimental design and is used to optimize manufacturing processes.
[0030]
Fatigue crack lengthEstimatedWhen attaching a plurality of sensors to one bolt hole, the crack length is calculated from the change pattern of the sensor output.EstimatedTo do. Therefore, it is necessary to obtain the strain output for each crack length as learning data in advance by analysis or experiment. Also, the length is determined by discriminant analysis.EstimatedYou can also For example, if there are many experimental results when the crack lengths are different, the fatigue crack length can be calculated by estimating which data pattern the measured data is closest to.Estimatedcan do.
[0031]
Next, various programs operating in the measurement computer 4 will be described in detail.
[0032]
Inside the small smart terminal 5, an A / D conversion control program, a data processing program, and a measurement condition control command transmission / reception program are running.
[0033]
In the A / D conversion control program, a device driver used for controlling normal A / D conversion is described. In the data processing program, algorithms such as data smoothing, FFT, wavelet transform, and averaging processing are packaged. The measurement condition control command transmission / reception program describes a TCP / IP protocol network transmission / reception program.
[0034]
The measurement condition control command transmission / reception program starts a thread or multitask management program defined in Java language after the small smart terminal 5 is started, creates a TCP / IP packet, and starts a TCP / IP server program. The TCP / IP server monitors a connection request for a specific connection packet number. If the Java language is used, this work can be easily created with a standard class library. If there is a connection request, the thread is activated, and the operation control program is activated by multitasking.
[0035]
Details of the operation control program are shown in FIG. The operation control program acquires the IP address of the transmission source from the data transmitted in step S1, and stores it. In step S2, a text command is acquired. In step S3, the text command is decoded. In step S4, an instruction is selected from an instruction list recorded in advance in the array, and the instruction is executed as a subprogram.
[0036]
If the subprogram is a setting change, the setting is changed in step S5, reply data is created in step S6, the reply program is started in step S7, and the text is returned to the IP address of the sender. If the subprogram is data processing, data processing is performed in step S8, and reply data is created in step S9. Then, in the next step S7, a reply program is activated, and the text is replied to the IP address of the transmission source. If the subprogram is an A / D conversion instruction, an instruction is issued to the A / D conversion device driver in step S10, and sensor information is acquired in step S11. Then, the process proceeds to step S12 or step S13. In step S12, the sensor information is stored in the memory. In step S13, reply data is created, and in the next step S7, a reply program is activated to send a reply to the sender IP address in text.
[0037]
Inside the judgment partial computer 6, a small smart terminal monitor program, a damage judgment program, an e-mail creation program, an electronic mail-Server program, data confirmation program, and WWW server program are running.
[0038]
Small smart terminal monitor program is a judgment partial computer6The small smart terminal 5 is simulated inside to supervise not to transmit an unexecutable command or the like. In addition, it is an object-oriented class that plays the role of a device driver for maintaining the hardware compatibility of the small smart terminal 5 and the device driver for maintaining the hardware compatibility of the sensor 2.
[0039]
FIG. 4 shows an abstract class of a small smart terminal. Instances of the Strain Gage class 17 and the Termo couple class 18 that are subclasses of the Sensor class 16 are stored in the array. The Strain Gage class 17 and the Termo couple class 18 store the latest data in instance variables. The hardware information of each sensor 2 is defined by a subclass of the Sensor class 16, and the hardware information of the small smart terminal 5 is defined by a subclass of the Smart Terminal class 15. All the sensor classes 16 have an initialization function initialize and a state check function check. Therefore, all the sensors 2 can be initialized by the instruction of the initialization function initialize.
[0040]
The damage determination program controls overall damage monitoring. Details of the damage determination program are shown in FIG. The damage determination program initializes the sensor 2 and performs a system check in step S21, and sets measurement conditions in the next step S22. If damage is determined using a threshold value, the process proceeds to step S23. If damage is determined by statistical test, the process proceeds to step S26.
[0041]
When judging the damage using the threshold value, the threshold value of the dangerous load and the vibration data measurement interval are set in step S23, the measurement condition is confirmed in the next step S24, and the measurement is performed under the measurement condition. And processing the measured measurement data. In subsequent step S25, damage is determined. If damage is determined in step S25, the process proceeds to the next e-mail creation program to create a mail to be transmitted to the administrator computer 8. If no damage is determined in step S25, the process returns to step S24.
[0042]
When determining damage by statistical test, statistical test and measurement interval are set in step S26, measurement conditions are confirmed in the next step S27, measurement is performed under the measurement conditions, and measured measurement data is obtained. To process. In subsequent step S28, it is determined whether or not to start monitoring. When the monitor is started, the process proceeds to the next step S29, and when the monitor is not started, the process returns to the previous step S27. In step S29, the measurement conditions are confirmed, measurement is performed under the measurement conditions, and the measured measurement data is processed. Then, damage is determined in the next step S30. If damage is determined in step S30, the process proceeds to the next e-mail creation program to create a mail to be transmitted to the administrator computer 8. If no damage is determined in step S30, the process returns to step S29.
[0043]
In the case where damage is determined by statistical test, measurement is divided into a learning data collection stage and a monitoring stage. In the learning stage, data is collected during a preset period, and statistics such as average value and variance are calculated. In the monitoring stage, measurement is performed at set intervals.
[0044]
In addition, a method for determining damage by an equivalence test of response surfaces between measurement sensor information or a method for determining damage using learning data can be used for the damage determination program.
[0045]
E-mail creation program if damage is determined by the damage determination programHappenedMove. At that time, a re-investigation can be automatically performed. In the e-mail, contents for notifying the abnormality of the partial structure 1 are described. In addition, the measurement result of each sensor can be posted in the e-mail.
[0046]
Email creationEmail created by the program is sent to an email server-It is transmitted to the administrator computer 8 by the program. Email server-For security reasons, it is desirable that the program is set so that the e-mail is distributed only to a specific e-mail server, and that the e-mail transmission and retransmission request can be connected only from itself.
[0047]
Data confirmation program is an email server-After the program notifies the administrator computer 8 of the determination of the damage of the partial structure 1 or during periodic inspection, the administrator computer 8 is started by requesting the WWW service from the measurement computer 4 by the WEB browser. The data confirmation program may be always activated.
[0048]
WWW service is a WWW server-Provided by the program. WWW server-In addition to setting the ID and password, the program is preferably set so that it can be accessed only from a specific IP address or network address. Unnecessary services should be closed.
[0049]
The administrator computer 8 is a WWW server.-Monitor bridge damage on the homepage provided by the program. An example of the homepage screen is shown in FIG. On the screen of the bridge damage monitoring home page in FIG. 6, the bridge structure is subgrouped into partial structure a to partial structure f. The buttons 19a to 19f on the left side of the screen are link buttons to the home pages of the partial structures a to f.
[0050]
A partial structure selector 20 and a sensor selector 21 are arranged in the center of the right side of the screen. In FIG. 6, the partial structure a and the sensor c are selected. And sensor about partial structure acIs displayed in a graph in the upper right window 22. When the mouse cursor 23 is focused on a part of the graph, the value is displayed in the small window 24. In the lower right window 25, the damage determination result of the partial structure a is displayed. In FIG. 6, “abnormal” is displayed. Also, in the lower right is a button for issuing a measurement command to the sensor26, Button to send sensor initialization command27, Button to instruct the judgment partial computer 6 to judge damage28Are arranged respectively. If necessary, a button for instructing the judgment partial computer 6 to redetermine damage can be arranged.
[0051]
An example of the homepage screen of each partial structure is shown in FIG. On the upper side of the screen is a sensor selector 21, a window 22 for displaying a measurement result in a graph, and a button 26 for issuing a measurement command to the sensor.,A button 27 for issuing an initialization command to the sensor is arranged. At the bottom of the screen, a sensor measurement condition selector is arranged. Sample interval is selector 29, sample time is selector 30, data smoothingConversionThe score is selected by the selector 31. In addition, a button 32 for instructing a change of the graph displayed on the window 22 is arranged on the lower side of the screen. Therefore, the administrator computer 8 can adjust the measurement interval and measurement time of the sensor from the homepage screen.
[0052]
Details of the data confirmation program are shown in FIG. The data confirmation program reads the selector number of the partial structure selected by the structure selector 20 in step S31, and reads the selector number of the sensor selected by the sensor selector 21 in step S32. Then, in the next step S33, it is checked whether or not the selected sensor is in a measurable state. If the sensor is measuring or if it is determined that the sensor is not measurable, the process proceeds to step S34, and a sensor error is displayed in step S34. If it is determined in step S33 that measurement is possible, the process proceeds to step S35.
[0053]
In step S35, a sensor measurement command is transmitted to the small smart terminal monitor program. In step S36, sensor measurement data is received from the small smart terminal monitor program. In step S37, the data is processed to create a graph image of the measurement result. In step S38, the graph is displayed again on the window 22 of the home page.
[0054]
Although the damage monitoring system for the bridge structure has been described above, the damage monitoring system of the present invention can also be applied to devices such as pumps and small generators. For example, when applied to a pump, a control board is provided for the pump, and a D / A conversion function is provided for the measurement computer 4.TakeIf connected, the measurement computer 4 is connected to the pump control board.SetThus, not only can the pump stop operation be remotely controlled, but also the rotational speed of the pump can be controlled remotely.
[0055]
【The invention's effect】
  As described above, according to the present invention, the measurement computer connected to the sensor attached to the structure transmits the damage determination function for determining damage to the structure and the determination result of damage to the structure to the administrator computer. And having a remote transmission / reception function for receiving commands from the administrator computer, the structure can be automatically monitored from a remote location. In addition, the measurement condition control function allows remote adjustment of sensor measurement conditions, enabling more detailed monitoring.It becomes possible.
[Brief description of the drawings]
[Fig. 1] Configuration diagram of damage monitoring system for bridge mechanism
[Figure 2] Configuration diagram of the measurement computer
Fig. 3 Flow chart of measurement condition control program
FIG. 4 is a flowchart of a small smart terminal monitor program.
Fig. 5 Flow diagram of damage assessment program
[Figure 6] Figure showing the homepage screen for bridge structure monitoring
FIG. 7 is a diagram showing a homepage screen for partial structure monitoring.
[Figure 8] Flow chart of data confirmation program
[Explanation of symbols]
1 Partial structure
2 sensors
3 Analog lead wire
4 measurement computers
5 Small smart terminals
6 Judgment partial computer
7 Ethernet cable
8 administrator computer
9 Internet line
10 A / D conversion function
11 Data processing functions
12 Measurement condition control function
13 Damage judgment function
14 Remote transmission / reception function

Claims (4)

A plurality of sensors attached to the structure;
A measurement computer to which measurement information is input from each of the plurality of sensors;
A structure monitoring system comprising the measurement computer and an administrator computer connected via the Internet,
The measurement calculator is
An A / D conversion function for converting measurement information input from each of the plurality of sensors into a digital signal;
A data processing function for creating measurement data from the digital signal;
In the equivalence test between the response surface of the measurement data from each of the plurality of sensors and the response surface of the measurement data when the structure is healthy, when the equivalence of the response surface is statistically rejected A damage determination function for detecting damage to the structure by determining that an abnormality has occurred in the structure;
A remote transmission / reception function for transmitting a determination result of damage to the structure to the administrator computer and receiving a command from the administrator computer;
A structure monitoring system comprising: a measurement condition control function for controlling the measurement condition of the sensor in accordance with a command from the administrator computer. The measurement computer includes the A / D conversion function, the data processing function, and the measurement condition control function, and includes a first computer connected to the plurality of sensors, the damage determination function, and the remote transmission / reception function. 2. The structure monitoring system according to claim 1, comprising a second computer, wherein the first computer and the second computer are connected by Ethernet.   The structure monitoring system according to claim 1, wherein the remote transmission / reception function communicates by electronic mail.   The structure monitoring system according to claim 1, wherein the remote transmission / reception function communicates by WWW.

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