WO2005003689A1 - 構造体監視システム - Google Patents
構造体監視システム Download PDFInfo
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- WO2005003689A1 WO2005003689A1 PCT/JP2003/008395 JP0308395W WO2005003689A1 WO 2005003689 A1 WO2005003689 A1 WO 2005003689A1 JP 0308395 W JP0308395 W JP 0308395W WO 2005003689 A1 WO2005003689 A1 WO 2005003689A1
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- physical quantity
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- numerical analysis
- distortion
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- 239000013307 optical fiber Substances 0.000 claims abstract description 125
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/083—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT]
- G01M11/085—Testing mechanical properties by using an optical fiber in contact with the device under test [DUT] the optical fiber being on or near the surface of the DUT
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
- E21F17/185—Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/42—Circuits effecting compensation of thermal inertia; Circuits for predicting the stationary value of a temperature
- G01K7/427—Temperature calculation based on spatial modeling, e.g. spatial inter- or extrapolation
Definitions
- the present invention relates to a structure monitoring system that measures physical quantities such as temperature and strain of a structure using an optical fiber sensor.
- Japanese Patent Application Laid-Open No. 11-19876550 describes information based on information from a distributed optical fiber sensor laid in a meandering shape along the longitudinal direction of the tunnel on the inner peripheral surface of the tunnel.
- a structure monitoring system that detects a deformation of a tunnel is disclosed.
- a loop-shaped optical fiber sensor wound a predetermined number of times per unit loop section length is provided in a circumferential direction of the tunnel.
- the loop-type optical fiber sensor is connected to one end of this loop-type optical fiber sensor, and the strain-distribution measuring device is pulsed to the loop-type optical fiber sensor.
- Light is incident and Brillouin scattered light from a loop-shaped optical fiber sensor based on the pulse light is received to measure distortion.
- this structure monitoring system can continuously change the shape of the tunnel at a location remote from the site, and can detect three-dimensional distortion with high accuracy using a loop-shaped optical fiber sensor.
- the optical fiber sensor since the optical fiber sensor is laid on the inner wall surface of the tunnel, distortion at a position near the inner wall surface (surface) of the tunnel can be detected with high accuracy. It was difficult to measure the strain inside the inner wall, especially at a position distant from the optical fiber sensor.
- the optical fiber sensor cannot be densely laid on the inner wall surface of the tunnel due to technical reasons or costs, and the optical fiber sensor is arranged along the circumferential direction of the tunnel at predetermined intervals in the axial direction of the tunnel. Therefore, it is difficult to measure the distortion with high accuracy at the position where the optical fiber sensor is not laid, even at the position near the inner wall surface of the tunnel.
- the present invention has been made in view of the above background art, and is capable of estimating a physical quantity such as strain or temperature at a position distant from a position where an optical fiber sensor is laid, and is capable of estimating a physical amount at any position in a structure.
- the purpose is to provide a structure monitoring system that can monitor physical quantities with high accuracy. Disclosure of the invention
- a structure monitoring system provides a physical amount at a predetermined point of a structure where physical quantities such as temperature and strain at a boundary or one point inside are expressed by a governing equation.
- a structure monitoring system that sets conditions and performs an analysis by a numerical analysis method, and monitors a structure based on the analysis result.
- the optical fiber sensor uses an optical fiber sensor laid on a boundary of the structure. Measuring means for measuring the physical quantity of the structure at each point on the boundary on which is laid, and numerical values for calculating the physical quantity at a predetermined point of the structure by the numerical analysis method using the physical quantity measured by the measuring means as a boundary condition.
- Analysis means; and display means for displaying information relating to the physical quantity analyzed by the numerical analysis means in association with the position of the structure. It is characterized in.
- an object such as a temperature or a distortion at a position where the optical fiber sensor is laid by the measuring means including the optical fiber sensor laid on the boundary of the structure.
- the physical quantity can be measured with high accuracy.
- the numerical analysis means the physical quantity at a predetermined point of the structure where the physical quantity at a boundary or an arbitrary point inside is represented by a governing equation, and the physical equation measured by the measuring means as a boundary condition, By solving with the numerical analysis method, the physical quantity at a predetermined point of the structure can be calculated and estimated.
- display means for displaying the physical quantity analyzed by the numerical analysis means in association with the position of the structure it is possible to monitor the physical quantity at any position in the structure with high accuracy, and to obtain a constant value. It is possible to easily and quickly identify the portion of the structure where the above physical quantity change has occurred. Therefore, it is possible to promptly respond to post-work such as repair of a structure without requiring a detailed re-inspection as in the prior art.
- another structure monitoring system is a system for monitoring a physical quantity at a predetermined point of a structure where a physical quantity such as temperature and strain is expressed by a governing equation at a boundary or at one point in the interior.
- a structure monitoring system that sets conditions and performs an analysis by a numerical analysis method, and monitors the structure based on the analysis result, wherein an optical fiber cell laid on at least one of a boundary of the structure and an inside thereof.
- the physical quantity at each point on the body boundary which is converted to be input as the boundary condition, is derived from the dominant equation and Numerical analysis means for calculating an analytical physical quantity at a predetermined point of the structure by the numerical analysis method using at least one of the above derived physical quantity and the measured physical quantity as a boundary condition, and information on the analytical physical quantity by the numerical analysis means.
- Display means for displaying the structure in association with the position of the structure.
- a physical quantity such as temperature and strain at a position where the optical fiber sensor is laid is increased by measuring means including an optical fiber sensor laid on at least one of the boundary of the structure and the inside thereof. It can be measured with accuracy.
- an object at each point on the boundary of the structure where the optical fiber sensor is not laid is obtained by using the physical quantity measured by the measurement means. Since the physical quantity (physical quantity at each point on the boundary of the structure where the optical fiber sensor is not laid and converted to be input as the boundary condition) is derived from the above governing equation, The optical fiber sensor can be laid relatively freely without being bound by the body boundary, thereby facilitating the installation of the optical fiber sensor.
- the physical quantity at a predetermined point of the structure where the physical quantity at an arbitrary point on the boundary or inside is represented by a governing equation is determined by the physical quantity measured by the measurement means or the physical quantity derived by the numerical analysis means.
- a display means for displaying the physical quantity analyzed by the numerical analysis means in association with the position of the structure it is possible to monitor the physical quantity at any position in the structure with high accuracy, and furthermore, it is possible to monitor the physical quantity at a certain level. It is possible to easily and quickly specify the position of a structure having a change in reason. Therefore, it is possible to promptly respond to post-work such as repair of a structure without requiring a detailed reinspection as in the prior art.
- the structure monitoring system further includes a notifying means for notifying when a physical quantity analyzed by the numerical analysis means exceeds a predetermined physical quantity.
- the observer when there is a position exceeding the predetermined physical quantity in the structure, the observer can instantly know the situation. Moreover, for example, if the predetermined physical quantity is set to the limit value of the normal range of the structure, the observer can instantly know the abnormality of the structure.
- the optical fiber sensor is laid on a surface of the structure.
- the numerical analysis means may be configured to calculate an analysis physical quantity by a boundary element method as the numerical analysis method.
- the boundary can be set by using the Green function and the like or the basic solution. Only the information can be analyzed, and the area to be divided is reduced by one dimension, so that the time and labor required for element division can be greatly reduced.
- a defective portion such as a crack is generated inside the structure, it is possible to flexibly cope with the problem unlike the case of the finite element method.
- the numerical analysis unit divides the structure into two regions partially overlapping each other, calculates an analysis physical quantity at a point in one region by a boundary element method, and The physical quantity at each point may be calculated by the boundary element method, and the analysis physical quantity at the point in the other area may be calculated by the finite element method using the analysis physical quantity on the overlapping area as a boundary condition.
- the analysis physical quantity of the structure while taking advantage of the advantages of both the boundary element method and the finite element method. That is, for example, when the structure monitoring system of the present invention is applied to monitoring of the falling of debris due to the destruction of the inner wall of the tunnel, in the area near the surface of the structure which is often adopted as the boundary of the structure It is necessary to analyze the occurrence of cracks with high accuracy. Therefore, the analysis physical quantities are calculated by the boundary element method suitable for crack analysis problems. On the other hand, in a remote area far away from the surface of the structure, for example, even if a crack occurs, it does not directly lead to the fall of the fragment, so when the change of the analysis target such as crack can be ignored, the versatile finite element method is used. An analysis physical quantity is calculated.
- the measurement unit is configured to measure the distortion as the physical quantity at least at a substantially same point a plurality of times, while the numerical analysis unit is configured to include the measurement unit
- the measured strain caused by the above is changed beyond a predetermined allowable range, it is determined that a crack has occurred inside the structure, and a predetermined reference point of the structure is determined by the boundary element method assuming the position and shape of the crack.
- the difference between the assumed strain and the analytical strain at the reference point calculated by the boundary element method using the measured strain at the reference point or the measured strain as a boundary condition is minimized. It is preferable to configure so as to identify the position and the shape.
- the position and shape of the crack can be estimated with high accuracy.
- the structure can be monitored with higher accuracy.
- the measurement unit is configured to measure the temperature as the physical quantity at least at a substantially same point a plurality of times, while the numerical analysis unit is
- the temperature measured by the method exceeds a predetermined allowable range, it is determined that an abnormally hot site has occurred inside the structure, and the position and shape of the abnormally hot site are assumed and the specified temperature of the structure is determined by the boundary element method. And the difference between the assumed temperature at the reference point and the measured temperature at the reference point or the analysis temperature at the reference point calculated by the boundary element method using the measured temperature as a boundary condition is minimized. It is preferable that the position and the shape of the abnormal temperature site are identified.
- the position and distribution state of the abnormal temperature site can be estimated with high accuracy, and the structure can be monitored with higher accuracy.
- the numerical analysis means may include a predetermined point in the structure having an infinite boundary sufficiently separated from the predetermined point analyzed by the numerical analysis means to be able to ignore the boundary condition.
- the measurement unit includes a measurement unit for confirmation laid at an arbitrary position of the structure, and measures a physical quantity at each point at a position where the measurement unit for confirmation is laid,
- the numerical analysis means is configured to calculate the analytic physical quantity at a point where the physical quantity is measured by the confirmation measurement means, and the display means relates to a comparison between the measured physical quantity and the analytic physical quantity at the same point.
- the information is configured to be displayed.
- the accuracy of the estimation by the numerical analysis means can be confirmed by comparing the analysis physical quantity, which is the analysis result by the numerical analysis means, with the measured physical quantity, which is the actual measurement value by the measurement means for confirmation. Based on this confirmation result, it is possible to improve the accuracy such as resetting the element division.
- the optical fiber sensor also serves as the measurement device for confirmation.
- the optical fiber sensor is covered with a magnetostrictive member that deforms in accordance with a magnetic force.
- the optical fiber sensor is deformed in accordance with the magnetic force, so that the magnetic field can be calculated by the measuring means using the optical fiber sensor, and thereby the magnetic field of the structure can be measured.
- the range of physical quantities to be analyzed is widened.
- FIG. 1 is a configuration diagram showing a structure monitoring system according to a first embodiment of the present invention.
- FIG. 2 is a front view showing an arrangement of optical fiber sensors in the structure monitoring system.
- Fig. 3 is a flowchart showing the processing of the measurement unit in the structure monitoring system.
- Fig. 4 is a flowchart showing the initial settings of the numerical analysis unit in the structure system.
- FIG. 5 is a flowchart showing the analysis processing of the numerical analysis unit in the structure monitoring system.
- Figure 6 is a schematic diagram showing the relationship between the nodes of the disc S and the measurement points by the optical fiber sensor. It is a schematic diagram.
- FIG. 7 is a front view showing a disk including a crack that is monitored by the structure monitoring system according to the second embodiment.
- FIG. 8 is a flowchart showing the identification processing of the numerical analysis unit in the structure monitoring system.
- FIG. 9 is a cross-sectional view showing a circular tubular body monitored by the structure monitoring system according to the third embodiment.
- FIG. 10 is a front view showing a structure monitored by the structure monitoring system according to the fourth embodiment.
- FIG. 11 is a flowchart showing the analysis processing of the numerical analysis unit in the structure monitoring system.
- FIG. 12 is a front view showing a tunnel monitored by the structure monitoring system according to the fifth embodiment.
- FIG. 13 is a front view showing an arrangement mode of optical fiber sensors in a structure monitored by the structure monitoring system according to the sixth embodiment.
- FIG. 14 is a flowchart showing the analysis processing of the numerical analysis unit in the structure monitoring system.
- FIG. 15 is a configuration diagram illustrating a structure monitoring system according to the seventh embodiment. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is an overall configuration diagram showing a structure monitoring system according to the first embodiment.
- the structure monitoring system 1 monitors the distribution of distortion (physical quantity) in a disk S as a structure to be monitored.
- the first embodiment will be described as a two-dimensional elasticity problem.
- the disk body S are those not acts surface forces (hereinafter referred to as "Torakushiyon") in later-described boundary 1 ⁇ on, whereas the displacement on the later-described boundary gamma 2 is constrained And
- the structure monitoring system 1 monitors a change in strain due to deterioration of the material.
- the structure monitoring system 1 includes a measuring section (measuring means) 3 including an optical fiber sensor 2, a control section (control means) 4 electrically connected to the measuring section 3 via a communication means 6a.
- a display unit (display means) 6 electrically connected to the control unit 4 via the communication unit 6b; and a monitoring unit 10 electrically connected to the control unit 4.
- the measuring unit 3 measures the distortion of the disc S at a high resolution.
- the measuring unit 7 includes an optical fiber sensor 2 connected to the measuring unit 7 and having one end fixed along the periphery of the disc S. And is configured.
- the measuring device 7 measures the distribution of strain by inputting measurement light to the optical fiber sensor 2 and receiving Brillouin scattered light based on the measurement light.
- the measuring device 7 has a built-in timer (not shown) that measures the distribution of the strain at predetermined time intervals, for example, at one-hour intervals, and distorts the output according to the output from the control unit 4 as necessary. Is to be measured.
- the measuring device 7 may be a known optical transceiver, for example, a light source 70 that supplies pulsed light of a predetermined frequency to the optical fiber sensor 2 and receives the Brillouin scattering light of a predetermined frequency.
- a photodetector 71 that converts the electric signal into an electric signal and an arithmetic unit 72 that calculates the distortion based on the electric signal are used.
- the light source 70 various semiconductor lasers such as a distributed feedback semiconductor laser and a distributed Bragg reflection laser can be used.
- the light detection unit 71 may be any unit that receives the scattered scattered light and outputs an electric signal corresponding to the received light.
- a light receiver that converts the received light into an electric signal corresponding to the light intensity
- a bandpass filter that transmits only electric signals in a predetermined frequency band.
- the arithmetic unit 72 can use a computer that executes predetermined arithmetic processing, such as a personal computer equipped with a microprocessor.
- the optical fiber sensor 2 is a distributed optical fiber sensor 2 for measuring the distribution of physical quantities such as distortion and temperature at the position where the optical fiber sensor 2 is laid, and is composed of, for example, a silica-based optical fiber. You. In the first embodiment, it is used to measure the strain distribution of the disc S. This optical fiber sensor 2 It is required to be laid on the surface or inside of the target structure.
- the disk S is fixed in a winding manner on a part of the periphery (surface) of the disk S, and the distortion of the disk S
- the physical quantity detecting unit 2a is deformed in accordance with the above-mentioned condition, and the physical quantity detecting unit 2a is arranged in a state not fixed to the disk S and is connected to the light detecting unit 71 and the physical quantity detecting unit 2a.
- the physical quantity detection unit 2a is fixed to the disc S over its entire length, and is configured to detect physical quantities at a plurality of measurement points.
- the optical fiber sensor 2 having the high-precision physical detector 2a is used, and the measurement point interval can be set to 5 cm or less.
- the physical quantity detector 2a is configured such that a plurality of (two in the figure) optical fibers 2d are fixed to the base material 2c at a predetermined interval from each other. It is comprised by.
- two optical fibers 2 d are arranged side by side in the radial direction of the disc S with the base 2 c interposed therebetween, and the strain distribution as a physical quantity in the disc S is enhanced.
- the intervening part 2b of the optical fiber sensor 2 is also provided in a plurality corresponding to the number of physical quantity detectors 2a.
- the optical fiber may be constituted by one optical fiber, or these optical fibers may be integrally formed by one optical fiber.
- the optical fiber sensor 2 does not need to be composed of a plurality of optical fibers as in the first embodiment. For example, as shown in FIG. May be configured.
- the optical fiber sensor 2 has at least a number corresponding to the number of unknown node information among the trajectory and displacement value of a node (described later) of the structure.
- the physical quantity at the position can be measured.
- the position corresponding to the (k ⁇ 1) th node from the first (k_l) is determined. ) Distortions (quantity).
- the physical quantity detector 2a When measuring only the temperature without measuring the strain, it is not always necessary to fix the physical quantity detector 2a. Further, the physical quantity detector 2a does not need to be fixed to the disk S over its entire length, and may be fixed to the disk S by a holder at predetermined intervals. However, when it is fixed to the disc S over the entire length, it is advantageous in that precise measurement can be performed.
- the measuring unit 3 is configured to output the measured distortion (measured physical quantity) to the control unit 4.
- the control section 4 controls each section of the structure monitoring system 1, and is composed of, for example, a computer including a microphone processor.
- the control section 4 includes a numerical analysis section 5, an input section 8, and a setting input section 9.
- the numerical analysis unit 5 stores the measured distortion (measured physical quantity) of the measuring unit 3 input from the input unit 8 in the storage unit 51, and based on the stored information, calculates the distortion at a predetermined point of the disc S. (Analysis physical quantity) is analyzed by a numerical analysis method set in advance.
- the computer is configured as a computer capable of high-speed arithmetic processing.
- the boundary integral equation derived from the governing equation of the disc S is discretized, and the boundary integral equation is discretized to form an algebraic equation (simultaneous system).
- the linear element equation is derived, and the boundary element method is used to calculate the physical quantity by introducing the initial conditions and boundary conditions into this simultaneous linear equation.
- the analysis method using the boundary element method will be briefly described later.
- the initial conditions use distortion, traction, displacement values, and the like measured in advance by a specific device, while the boundary conditions are measured by the measurement unit 3.
- the measured distortion, the analytical distortion calculated from the measured distortion, the analytical traction, the analytical displacement value, and the like are used.
- the measurement distortion measured by the measurement unit 3 and the analysis distortion calculated from the measurement distortion are used as the boundary conditions.
- Analytical distortion at a predetermined point of the disc s to be analyzed can be automatically obtained at predetermined time intervals.
- the storage unit 51 includes, for example, a ROM (read only memory) and a RAM (random acce ss memory), and stores a program for operating each unit, a measured distortion (measured physical quantity), and an analysis result of the numerical analysis unit 5.
- the analysis distortion analysis physical quantity
- the input unit 8 associates information (measurement data) regarding the measurement distortion and the coordinates of the measurement point acquired from the measurement unit 3 with each other and stores the information in the storage unit 51 of the numerical analysis unit 5.
- the setting input section 9 is for inputting various input data to the numerical analysis section 5.
- the input data from the setting input unit 9 includes, for example, a boundary integral equation and a basic solution derived from a governing equation described later of the disk S, material constants included in the boundary conditions, and information on the shape of the disk S (eg, thickness , Diameter, material constant, etc.), modeling related matters including the coordinates of the nodes of the disk body S, the number, and the like.
- the display unit 6 displays the analysis distortion, which is the analysis result of the numerical analysis unit 5, in association with the position of the disk S, and displays, for example, the distortion distribution of the disk S as a contour diagram.
- a display such as a CRT, a liquid crystal panel, or an organic EL can be used.
- the monitoring unit 10 notifying unit notifies the user when the average value of the analysis distortion as the analysis result by the numerical analysis unit 5 exceeds a predetermined value. For example, it is configured to visually notify by a warning light or the like, to audibly notify by an alarm sound, or to transmit a message to a user by a built-in communication unit.
- the default value is slightly smaller than this total value, assuming a total value of distortions at all measurement points when a problem such as damage occurs in the disk body S in advance or when a problem may occur. Is set to Then, the default value is stored in the storage unit 51 of the numerical analysis unit 5, and when the predetermined value is exceeded, a signal is output from the numerical analysis unit 5 to the monitoring unit 10.
- FIG. 3 is a flowchart showing the operation of the measuring device 7.
- each unit of the measuring device 7 is initialized, and initial settings are made in preparation for measuring distortion by the optical fiber sensor 2 (step S10).
- the light source 70 is operated to emit a predetermined pulse light, and the Brillouin scattered light based on the pulse light is sampled by the light detection unit 71 over the entire length of the physical detection unit 2a, while the calculation unit In 72, the measurement distortion is calculated using the scattering gain spectrum based on this sampling, and the measurement coordinates are calculated using the time required for sampling (step S11).
- step S12 the measurement data including the information on the measurement distortion and the measurement location is output to the input unit 8 of the control unit 4 via the communication unit 10 (step S12).
- step S13 the processing from the step S11 to the step S12 is executed again (step S13). Specifically, it is determined whether or not a predetermined time set in advance has elapsed. If the predetermined time has not elapsed, a standby state is set (NO in step S13), while a predetermined state is set. If the time has elapsed, the process returns to step S11, where the measured distortion of the disc S and its measured coordinates are specified again.
- the numerical analysis unit 5 analyzes the distortion at a predetermined point of the disc body based on the measurement data such as the measurement distortion output from the measuring device 7 to the input unit 8, and the processing related to this analysis is executed. Before this, the following initial settings are made in the numerical analysis unit 5.
- FIG. 4 is a flowchart showing the initial setting in the numerical analysis unit 5.
- the numerical analysis unit 5 receives an input of information on the monitoring range of the structure (step S20). Specifically, in the first embodiment, information on the planar shape of the disc S, which is a structure, and analysis points that are inside or on the boundary of the disc S and for which the numerical analysis unit 5 analyzes distortion. Information (e.g., coordinates and number of analysis points) is input via the setting input unit 9, and input data such as the shape data is stored in the storage unit 51.
- Information e.g., coordinates and number of analysis points
- step S20 When the information on the monitoring range of the structure is input (YES in step S20), the input of the initial state on the monitoring range is accepted (step S20). S2 1).
- the initial state of the monitoring range includes initial conditions such as the load and displacement value acting on the disk S first, and the physical quantity at the analysis point is obtained as a relative quantity to the initial physical quantity. (In other words, whether it is obtained by increasing / decreasing based on the initial physical quantity) or whether it is obtained as an absolute quantity in consideration of the initial physical quantity in advance (that is, whether the actual physical quantity is obtained).
- the optical fiber sensor 2 measures the relative change from the laid state, the quality of the physical quantity to be obtained differs depending on how the initial conditions are set.
- the displacement value is zero on the boundary gamma 2 Is entered.
- the boundary gamma [rho boundary gamma 2 on in the Torakushiyon, displacement values, and the distortion is calculated as a relative amount of change from the initial state.
- the relative amount and the absolute amount are equal.
- a physical value as a true value can be calculated by a method described later.
- the input data is stored in the storage unit 51.
- the nodes may be set at equal intervals between the nodes, but, for example, positions where high-precision analysis results are required due to large changes in physical quantities such as displacement and stress are referred to as nodes.
- the intervals between nodes may be set differently, for example, by setting the intervals to be short.
- the relationship between these nodes and the element division is known, for example, in the boundary element method.
- the physical quantity on each element is set as a linear element so as to be represented by the physical quantity at the node.
- the node information stored in the storage unit 51 is associated with the information on the measured distortion (step S23). That is, when the measurement coordinates measured by the optical fiber sensor 2 are the same as the coordinates at which the node is provided, the distortion value at the node number is stored as the distortion value measured by the optical fiber sensor 2.
- the numerical analysis unit 5 After the initial setting is performed in the numerical analysis unit 5 as described above, the numerical analysis unit 5 performs distortion analysis.
- a plurality (N in the first embodiment) of nodes are set on the boundary of a portion to be analyzed in a structure, and the traction (derivation truncation) and displacement values (derivation displacement values) at all nodes are set. ) Is obtained, and the derived traction and the derived displacement value are substituted as boundary conditions into a boundary integral equation described later, and the It analyzes the distortion value at an arbitrary point on the inside or on the boundary.
- Equation (1) cij Ui ( y ) ii,)
- c is a constant matrix determined by the position of point y, u ;. (D) is the displacement value at point D, and tj (E) is the traction at point E.
- u * 5 and t * are basic solutions called solutions of Ke 1 Vin, and L ap 1 ace equation when unit concentration force acts on one point X in an area having usually infinite spread Is used. In the case of a two-dimensional problem, it is given by
- Equation ( 3 ) "tij (x, y) 2 ⁇ , ill (i- 2r ) ⁇ ij + 2r ir j ⁇
- boundary conditions transformation and displacement values at the nodes
- ⁇ (y) ⁇ is the distortion at an arbitrary point on the region ⁇ or boundary ⁇
- ⁇ u ⁇ and ⁇ t ⁇ are the node information (traction, displacement) at node: i. [H] and [G] are coefficients calculated from the basic solution.
- the displacement may be obtained as the analysis physical quantity.
- the distortion in Expression (4) can be expressed by the displacement difference of the optical fiber sensor 2 in the axial direction, and can be obtained by using the displacement difference formula.
- FIG. 5 is a flowchart showing an analysis process in the numerical analysis unit 5.
- the analysis process it is determined whether or not measurement data, which is data relating to a measurement distortion and a measurement location, is input from the input unit 8 (step S30). If measurement data has not been input, wait (NO in step S30), and if measurement data has been input, check the unknown traction and displacement values of the traction and displacement values at all nodes. (Step S31). Specifically, the missing boundary conditions, that is, the tractions and displacements not given as the initial conditions among the tractions and displacements at all the nodes are set as unknowns.
- the traction or displacement value set as the unknown is calculated using the above equation (7) and the number of measurement distortions corresponding to the number of unknowns (step S32).
- equation (7) If the fraction or displacement value set as the unknown is referred to as unknown node information, in equation (7), the distortion measured by the optical fiber sensor 2 is substituted into the left side, while the node information including the unknown node information is substituted. (Traction and displacement Value) on the right side. This derives an equation that contains the unknown node information by that number. When this equation is set up for the number of measurement distortions corresponding to the number of unknown node information, it becomes a simultaneous equation of the number corresponding to the number of unknown node information. By solving this equation, the unknown node information can be calculated.
- one Torakushiyon displacement value is Ru known Der is unknown at the boundary gamma ⁇
- displacement values at the boundary gamma 2 is known Torakushi Yon is unknown, therefore
- 2 ⁇ pieces of node information are unknown. Therefore, 2 ⁇ measurement strains are measured by the optical fiber sensor 2, and the 2 ⁇ measurement strains and 2 ⁇ unknown node information are substituted into the above equation (7), whereby 2 ⁇ equations are derived. By solving this 2 ⁇ -dimensional simultaneous linear equation, 2 ⁇ unknown node information is calculated.
- step S33 in which the derived node information and the known node information are used as boundary conditions to analyze the distortion at a predetermined point of the disc S from Equation (7), and this is repeated for each analysis point.
- a desired number of analytical distortions in the disc S can be obtained.
- step S32 since all node information has been obtained in step S32, the right side of equation (7) becomes a constant at an arbitrary point y (coordinate) of the disc S, Distortion at point y (analysis distortion) can be analyzed.
- step S33 the analysis distortion calculated in step S33 is correlated with the coordinates of the analysis point and stored in the storage unit 51, and the analysis distortion and the analysis coordinates of the disk S are measured distortion and the measured coordinates and the derived distortion.
- the coordinates and their coordinates are displayed on the display unit 6 (step S35), and the processing ends.
- the measuring unit 3 including the optical fiber sensor 2 laid on the boundary of the disk S measures the distortion at the position where the optical fiber sensor 2 is laid on the disk S with high accuracy. be able to.
- unknown node information among the node information (traction, displacement value) of the disc S can be easily derived using the distortion measured by the measuring unit 3 and the equation (7) derived from the governing equation. Moreover, in deriving this unknown node information
- the measurement distortion by the measurement unit 3 is required by the number corresponding to the number of unknown node information.However, since the measurement distortion is measured using the optical fiber sensor 2, a large number of measurement distortions can be measured. It is also possible to avoid a situation in which the number of distortions is insufficient to derive unknown node information.
- all the node information can always be derived by the numerical analysis unit 5 as described above, and using this all the node information as a boundary condition, any point on the inside or the boundary of the disc S by the boundary element method.
- the point (analysis point) at which the analytical distortion is calculated is set in advance, and the analytical point and the analytical distortion can be correlated. Therefore, by associating the analysis distortion with the analysis point, the analysis distortion can be associated with the position of the structure S. By displaying the result on the display unit 6, the analysis distortion can be obtained at any position on the disk S. Can be monitored with high accuracy. In addition, the user can easily and quickly specify the position of the structure having a certain physical quantity change by monitoring the display unit 6. Therefore, it is possible to respond promptly to post-work such as repair of a structure without the need for detailed re-inspection as in the prior art. (Second embodiment)
- FIG. 7 shows that (a) shows the objects monitored by the structure monitoring system according to the second embodiment.
- FIG. 4B is an explanatory diagram showing an enlarged internal crack of the monitoring target.
- the structure monitoring system 1 has the same basic configuration as that of the first embodiment, but when a crack C occurs in the disk S to be analyzed, the position and position of the crack C are determined. It differs from the first embodiment in that the configuration is such that the shape can be specified in the numerical analysis unit 5.
- the numerical analysis unit 5 according to the second embodiment further includes a measurement distortion of the disc S measured at different times at the same measurement point.
- the amount of change in the measured strain exceeds a predetermined allowable range, it is determined that a crack C has occurred inside the disc S.
- the following equation (8) is not satisfied, it is determined that a crack C has occurred inside the disk S. If this determination is made, the position and shape of the crack C are determined. Configured to identify. That is,
- R the total number of measurement points
- ⁇ the measurement distortion at the measurement point by the optical fiber sensor 2 at the current measurement
- A the default value. is there.
- the measurement distortion is compared with the sum of the squares of the difference between the measurement distortions for all the measurement points as described above, but the difference in the distortion at each measurement point is compared. May be compared.
- P l
- P the number of reference points D
- ⁇ ' ⁇ ⁇ 3 is viewed measured distortion measured at the reference point D
- epsilon is the analysis distortion of the reference point D determined by the boundary element method forward analysis . This identification process will be specifically described with reference to the flowchart in the numerical analysis unit 5 of FIG.
- a crack C was defined as inner boundary gamma 3, with dividing the inner boundary gamma 3 elements (and mesh), providing a plurality of new unknown nodal on the interior boundary gamma 3.
- This node can be set arbitrarily on the internal boundary, but it is preferable to set it finely near both ends in the long axis direction.
- the modeling in the crack C may be automatically performed by the numerical analysis unit 5 or manually performed through the setting input unit 9. There may be. If you want to do it manually, for example For example, the display unit 6 may display a reminder regarding the input of the modeling of the crack C.
- the nodes provided on the inner boundary gamma 3 together with the use of the initial boundary condition that Torakushiyon is Ru zero der, with Torakushiyon and displacement values at nodes on the external boundary gamma of the disk body S, the first
- the distortion at the reference point D (assumed distortion) is analyzed using equation (7) (step S43).
- the measurement strain epsilon '[rho by measuring unit 3 for the reference point D; are measurement j, the allowable value difference between the measured strain epsilon, the assumed distortion and ⁇ ⁇ ⁇ ⁇ (absolute value of the difference) beta
- the numerical analysis unit 5 determines whether or not the value is within the range (step S44). If the difference between the two strains is not within the range of the allowable value ((NO in step S44), the assumption of the crack C is repeatedly corrected until the difference is within the range of the allowable value B (step S45).
- a well-known optimization method for finding an optimal parameter that minimizes the objective function f is adopted, and, for example, a genetic algorithm method is adopted as the optimization method.
- the position and shape of the crack C newly generated in the disk S can be estimated with high accuracy.
- the numerical analysis unit 5 of the second embodiment automatically changes the shape of the disc S to the newly generated crack.
- the shape is modified to include C. Therefore, after that, when monitoring the distortion in the same manner as in the first embodiment, the analytical distortion can be calculated in a state in which the crack C is taken into consideration, and the disk S can be monitored with higher accuracy.
- the shape of the crack C is automatically added to the shape of the disk S.
- the resetting of the shape of S may be manually performed.
- the measurement point of the optical fiber sensor 2 is adopted as the reference point D, and the measured distortion is compared with the assumed distortion, but, for example, the optical fiber sensor 2 is not laid. Points can be used as reference points.
- the analytical distortion at the reference point is calculated using the distortion measured by the optical fiber sensor 2, and this analytical distortion is compared with the assumed distortion.
- the structure monitoring system 1 according to the third embodiment has the same basic configuration as the second embodiment, except that the monitoring target is not a strain distribution but a temperature distribution, and the identification target is a crack. It is different from the second embodiment in that it is an abnormally high temperature part. Also, the shape of the structure S is different. As shown in FIG. 9, the structure S is configured as a circular cylindrical body, and is filled with a high-temperature fluid, and the inner wall may be damaged or missing due to the high-temperature fluid. Therefore, the structure monitoring system 1 of the third embodiment monitors the wall thickness of the cylindrical body, which is the structure S, based on the temperature distribution of the cylindrical body.
- the measurement unit 3 has the same basic configuration as the above embodiments, but has the following configuration due to the different monitoring targets. That is, in the optical fiber sensor 2 of the measuring section 3, the physical quantity detecting section 2a is fixed to the outer peripheral edge of the disk S in a wound shape, and is covered with a heat insulating material from above. By covering the outside of the physical quantity detection unit 2a with a heat insulating material in this way, the influence of the outside air temperature is reduced.
- the measuring unit 3 detects the temperature distortion based on the temperature change of the disk S by the optical fiber sensor 2 and measures the temperature (measured temperature) distribution on the outer peripheral edge of the disk S based on the detection result. It has been done.
- Other configurations are the same as those of the above-described first and second embodiments, and a description thereof will not be repeated.
- the numerical analysis unit 5 can analyze the temperature distribution on or within the boundary of the structure S.
- the configuration of the numerical analysis unit 5 is the same as that of each of the above embodiments, but the governing equations are different due to different monitoring targets, and the boundary integral equations and the like derived from the governing equations are different.
- the boundary integral equation when the monitoring target is temperature is expressed by the following equation.
- T (x) is the temperature
- Q (X) is the heat flux
- b (X) is the equivalent heat source inside the region ⁇ .
- the basic solution is also different due to the difference in the boundary integral equation, and the basic solution is expressed by the following equation.
- n is the unit normal vector of point X, and is the normal direction derivative. It is assumed that there is no heat source inside the analysis.
- the temperature at any point of the structure S can be calculated by substituting the predetermined initial conditions and the boundary conditions of the node information based on the measured temperature and the like measured by the measurement unit 3 into the above equation (13). By repeating this at a plurality of analysis points in the structure S, the temperature distribution in the structure S can be analyzed. Then, the temperature distribution of the structure S can be monitored by displaying the temperature distribution on the display unit 6 in association with the position of the structure S.
- the numerical analysis unit 5 when the difference between the measurement temperatures measured at different times at the same measurement point exceeds a predetermined range, the numerical analysis unit 5 Then, it is configured that the position and shape of the abnormally high temperature portion can be specified by the same method as in the second embodiment described above. Specifically, the numerical analysis unit 5 found that when the high-temperature portion was enlarged, a portion of the inner wall of the structure S was missing and the high-temperature portion was enlarged due to a change in the shape of the structure S. The expanded high-temperature part is identified as an abnormal high-temperature part, its position and shape are identified, and the shape of the structure S is reset based on the identification result.
- the measuring unit 3 is configured to measure the temperature (measured temperature) at the same measuring point a plurality of times. Then, the numerical analysis unit 5 compares the measured temperatures measured at different times for the same measurement point, and if the difference between these measured temperatures exceeds a predetermined allowable range, determines that an abnormally high temperature portion has occurred. It has been done. When this recognition is made, the numerical analysis unit 5 executes identification of the position and the shape of the abnormally high temperature part. The identification of the position and shape of the abnormally high temperature portion is based on the fact that the temperature and the temperature at the reference point D measured by the optical fiber sensor 2 are used as auxiliary information, and that the position and shape of the internal abnormally high temperature portion are unknown.
- the boundary gamma 9 is an internal boundary entailment boundary gamma ⁇ to the missing of the inner wall. Assuming that this boundary 1 ⁇ .
- the coordinates of the upper node are set to the parameters. Where the boundary ⁇ ⁇ .
- the upper number of nodes is set in advance via the setting input unit 9, and is assumed to be composed of, for example, 16 nodes.
- each node is set within a range within the boundaries gamma 9 above or region Omega, are set so as to form a closed region by connecting the first node and the last node with connecting nodes of adjacent numbers .
- the first node and the ninth node which is the node of the intermediate number, are set, and the line connecting the first node and the ninth node is divided into eight, It is also possible to set nodes at the top and bottom of each division point and the boundary ⁇ ⁇ .
- the upper node that is, identifying each node coordinate as a parameter, a new boundary ⁇ ! . Can be specified.
- the analysis temperature can be calculated for a plurality of analysis points set in advance on or inside the boundary of the structure S. Then, by associating the analysis points with the analysis temperature, the position of the structure S and the analysis temperature can be associated with each other, and the temperature distribution of the structure S can be obtained. By displaying this temperature distribution on the display unit 6, it is possible to monitor the temperature at any position in the structure S with high accuracy, and by monitoring this display unit 6, the user can obtain a constant temperature change. The position of a certain structure S can be easily and quickly identified. Therefore, it is possible to respond promptly to post-operations such as repair of the structure S without the necessity of precise re-inspection as in the prior art.
- the position and shape of the abnormally high temperature portion generated in the disk S can be estimated with high accuracy, and the shape of the structure S is determined based on the position and shape of the abnormally high temperature portion. This allows the user to specify the abnormally high temperature area due to the loss of the inner wall, etc., and based on the result, the user determines whether or not repair is necessary. Can be determined.
- the structure monitoring system 1 has the same basic configuration as that of the first embodiment, but the shape of the structure S to be monitored and the optical fiber sensor 2 are the same as those of the structure S. It differs from the first embodiment in that it is arranged inside and the analysis method executed by the numerical analysis unit 5.
- a structure S monitored by the structure monitoring system 1 includes a first structure S 1 having one end fixed to a fixed surface, A second structure S2, which is disposed on the edge side and is made of a material different from the first structure S1, and two second structures S1 and S2 connecting these first and second structures S1 and S2; And J.
- An optical fiber sensor 2 is disposed at the tip of the second structure S2 so as to cross the tip.
- the measurement unit 3 can use the optical fiber sensor 2 to measure at least the number of measurement distortions corresponding to the unknown number of node information (traction and displacement values) at nodes set on the boundary # 5 described later. It is composed of That is, the number of measurement points m is set to at least the number of unknown node information at the node n b on the boundary.
- the numerical analysis method in the numerical analysis unit 5 according to the first embodiment can flexibly cope with a change in the shape of a structure to be monitored such as the occurrence of a crack, but as shown in FIG.
- a structure to be monitored such as the occurrence of a crack
- FIG. 1 When the structures S l and S 2 made of a plurality of different materials are connected by the connecting rod J like the simple structure S, it is difficult to set the boundary conditions around the connecting rod J, etc. Therefore, it is considered that the analysis is difficult, and there is a problem in efficiency and accuracy in monitoring the first structure S 1 and the connected body J.
- the numerical analysis unit 5 performs analysis by combining the numerical analysis method according to the first embodiment and the finite element method. That is, the numerical analysis unit 5 divides the structure S into a partially overlapping region 0 and a region ⁇ 2, and analyzes the distortion (analysis distortion) inside or on the boundary of the region in the first embodiment by the numerical analysis. while that is configured to calculate the method to calculate the finite element method distortions on the internal or boundary regions Omega 2 It is configured to:
- Step S50 information on modeling of the structure S is received via the setting input unit 9.
- the structure S is divided into a partially overlapping region and a region ⁇ 2 , and in the region, the boundary is divided into a plurality of linear elements, and one node n while b is set, the area Omega 2 in the inner region is divided into domain elements of a plurality of rectangular, the corners of each element is a node n f one for the points to be set is set.
- a node n b in Torakushiyon s t is zero on the boundary gamma 4
- a node n b in the node information (Torakushiyon and displacement value) are both unknown on the boundary gamma 5, set the these initial configuration information, Input through the input unit 9.
- Step S 5 calculates the node information in the node n b on the boundary gamma 5 which was unknown at the initial setting.
- the number of unknowns is 4 times the number of nodes n b on the boundary gamma 5
- the measurement distortion at the measurement point m corresponding to this number is measured by the measurement unit 3.
- a simultaneous equation is derived by substituting the distortion measured by the measuring unit 3 into the above equation (7). By solving this simultaneous equation, all of the above-mentioned unknown node information (traction and displacement value) is calculated.
- Step S 5 2 calculates Torakushiyon and displacement values at the nodes n b on 5 (Step S 5 2), use only the displacement values of the calculation output result to the analysis in the area Omega 2 to be described later.
- the analysis distortion inside or on the boundary is calculated by the finite element method (step S53).
- the numerical analysis method using the finite element method is known, and a number of general-purpose software is available. Also, focusing on the area between the boundaries, if the stress field obtained by the finite element method (FEM) is converted into traction, the traction obtained by the boundary element method (BEM) always matches.
- the position and shape of the crack can be identified as in the second embodiment.
- the structure monitoring system 1 has the same basic configuration as that of the first embodiment, except that the structure S to be monitored is a tunnel. This is different from the first embodiment in the boundary conditions input to the first embodiment.
- the object to be monitored is a tunnel S (more specifically, a structure forming a tunnel entrance). And so on. Therefore, the optical fiber sensor 2 of the measuring unit 3 is disposed along the inner wall surface of the tunnel (on the boundary). Specifically, the optical fiber sensor 2 is laid so as to reciprocate from one end opening of the tunnel along the circumferential direction of the tunnel and to the other end opening in the axial direction of the tunnel.
- this system 1 It monitors the distribution of strain near the inner wall of the tunnel, since it monitors the detachment of concrete lumps.
- the structure monitoring system 1 according to the fifth embodiment is configured so that the numerical analysis unit 1 can devise the input of the initial boundary conditions to monitor the strain distribution near the inner wall of the tunnel with high accuracy. I have.
- the region ⁇ to be analyzed of the structure S constituting the tunnel entrance includes, as shown in FIG. 12, a boundary ⁇ 6 which is an inner wall of the tunnel and a boundary ⁇ which is a grounding portion continuous to the boundary ⁇ 6. 7 and a boundary ⁇ 8 which is an infinite boundary continuous with the boundary.
- a boundary gamma 8 infinite boundary ranges boundary gamma 6 near to monitor on this system 1, since the boundary gamma 6 and boundary gamma 8 are sufficiently separated, the basic solution of claim boundary gamma 8 Is zero, and the term at the boundary ⁇ 8 can be ignored.
- Equation (14) lti ( x ) dr ( x )
- the spacing between nodes adjacent to the m sections point becomes gradually wider between the a and b set to, by utilizing the fact that the basic solution of the larger boundary Sakaiue than the point b is sufficiently small, as unknowns Displacement values and Torakushiyon between ab, be determined with unknowns on gamma 6 it can.
- ⁇ (y) ⁇ is the strain at any point on the region ⁇ or boundary ⁇
- ⁇ u r6 ⁇ , ⁇ t r6 ⁇ is the node information (Bok Rakushiyon at the nodes on the boundary gamma 6, displacement Value).
- HJ, [G are coefficients calculated from the basic solution.
- the numerical analysis portion 5 the above equation (15) is housed, initial conditions such as the initial boundary conditions for boundary gamma 7 from the setting input unit 9 for this numerical analysis portion 15 (displacement value is zero) is On the other hand, the input unit 8 receives from the input unit 8 the measurement distortion of the boundary # 6 measured by the optical fiber sensor 2. Then, under these conditions, it is possible numerical solution analyzing unit 5 analyzes the distortion of any point in the internal region of the boundary gamma 6 on or near the structure S (Analysis distortion).
- the structure monitoring system 1 according to the sixth embodiment has the same basic configuration as that of the first embodiment, but the structure monitoring system 1 according to the sixth embodiment has The first embodiment is different from the first embodiment in that an optical fiber sensor 2 for checking the accuracy of the analysis distortion by the numerical analysis unit 5 is installed in addition to the optical fiber sensor 2 for measuring the measurement distortion as a boundary condition. And different. Note that, in the sixth embodiment, the shape of the structure S to be monitored is also different from that of the first embodiment.
- the structure S is a substantially rectangular plate-like body.
- the optical fiber sensor 2 of the measuring section 3 is fixed along one peripheral edge of the structure S, and is configured so that the physical quantity detecting section 2a, which is the fixed portion, can measure a plurality of measurement distortions.
- the numerical analysis unit 5 uses the measured distortion to apply distortion (analysis distortion) at an arbitrary point on or inside the boundary of the structure S.
- an optical fiber sensor 200 for confirmation is laid in the center of the structure S in parallel with the optical fiber sensor 2.
- the confirmation optical fiber sensor 2 0 0 This is confirmed optical fiber sensor 2 0 0 confirmation measurement point m c on is set in advance, the Buriruan scattered light at the confirmation measurement point m c measurement unit 3 is received by the basis of this scan Bae spectrum, it has been assumed to be calculated and distortion at the confirmation measurement point m c. Then, it has been made from the measurement unit 3 and that this measurement distortion is output to the numerical analysis portion 5 together with the coordinates of the confirmation measurement point m c.
- FIG. 14 is a flowchart showing the analysis processing in the numerical analysis unit 5, which will be specifically described below with reference to this figure.
- step S60 the acquisition of measurement data (measurement distortion, coordinates of measurement points) by the optical fiber sensor 2 is confirmed as in the first embodiment (step S60). Then, the data measured by the confirmation optical fiber sensor 2 0 0 (measured distortion of the confirmation measurement point m c, the coordinates of the confirmation measurement point m c) determines whether it has acquired the (scan Tetsupu S 6 1) , If acquired, data measured by optical fiber sensor 2 Calculating the analysis distortion at the confirmation measurement point m c using (Step S 6 2). Since this numerical analysis method is the same as that in the first embodiment, the description is omitted here.
- the numerical analysis portion 5 and comparing the analysis distortion and measurement distortion at the confirmation measurement point m c (Step S 6 3), the error (the difference between the analysis distortion and measurement distortion) predetermined It is determined whether it is within the allowable range (step S64).
- the comparison between the two distortions may be a comparison of the squares of the difference between the two distortions, or a comparison of the absolute value of the difference between the two distortions.
- a default value that is used as a criterion for determining whether the value is within the allowable range is input in advance through the setting input unit 9, and a plurality of default values are set according to the monitoring level. It may be hot.
- step S65 If the error is within the allowable range (YES in step S65), the measurement data stored in the storage unit 51 is updated (step S66), and the distortion distribution is displayed on the display unit 6. Is displayed and the analysis processing ends.
- the error on the display unit 6 is within the allowable range super strong point
- the error is displayed together with the display of the presence (step S66), and the modeling of the structure S is reset.
- the resetting of the modeling includes, for example, changing the number of nodes and the node coordinates of the structure S, resetting the boundary element division, and the like.
- the setting is such that the change of the node coordinates is executed. Then, a signal indicating re-measurement at the predetermined measurement point m of the structure S is output to the measurement unit 3 (step S69), and the process proceeds to step S60.
- the estimation accuracy of the analysis distortion by the numerical analysis unit 5 can be confirmed through comparison with the measurement distortion by the confirmation optical fiber sensor 2, As a result, the accuracy of the modeling and the initial setting can be confirmed, and the accuracy can be improved by resetting the modeling and the like. As a result, the strain distribution of the structure S can be estimated with high accuracy, and a portion having high strain and which may be damaged can be specified with high accuracy, and repair and the like can be performed quickly.
- the structure S when the error exceeds the allowable range, the structure S It is said that the deling is reset, but this error may be due to a new crack in the structure S. Therefore, instead of resetting the modeling of the structure s, or when the error does not fall within the allowable range despite the resetting of the modeling a plurality of times, the same as in the second embodiment is performed. Then, it may be configured to recognize the occurrence of a crack and identify the position and shape of the crack.
- the confirmation optical fiber sensor 200 is provided separately from the optical fiber sensor.
- the optical fiber sensor 2 may have this function.
- the optical fiber sensor 2 is provided with a measurement point for confirmation that is different from the measurement point of the measurement distortion used for calculating the analytical distortion, and the measurement distortion at the measurement point for confirmation is compared with the measurement point. It becomes.
- an optical fiber sensor is used, and the measuring unit 3 calculates the measurement distortion using the optical fiber sensor.
- the measuring strain for the measurement may be, for example, one using a known measuring means such as another strain sensor.
- the structure monitoring system 1 according to the seventh embodiment has the same basic configuration as that of the first embodiment described above, but the structure monitoring system 1 according to the seventh embodiment has a display unit of wireless or Internet. It differs from the first embodiment in that it is connected to the control unit via a line.
- FIG. 15 is a configuration diagram illustrating a structure monitoring system 1 according to the seventh embodiment.
- the structure monitoring system 1 includes a control unit 4 having a communication unit 14 and a control unit 4 having a communication unit 14.
- a display unit 6 connected to the control unit 4 via a wired line; a first remote display unit 12 connected to the control unit 6 via a network system 11; a control unit 4 and a communication unit And a second remote display unit 13 that communicates via 14 and 15.
- the first remote display unit 12 has a modem in addition to the same configuration as the display unit 6, and receives information output from the control unit 4 via the network system 11 such as the Internet by the modem.
- Information from the control unit 4 includes, for example, analysis distortion.
- the first remote display unit 12 displays information such as figures or characters on the screen, and also has a function as a monitoring unit 10. If the distortion exceeds the specified value, the user is notified to that effect.
- the second remote display unit 13 has a communication unit 15 in addition to the same configuration as the display unit 6, and captures an electromagnetic wave as a carrier wave sent from the control unit 4 by the communication unit 15, and converts the electromagnetic wave to this electromagnetic wave.
- the communication signal contained therein is extracted and converted into an electric signal, and based on the electric signal, a strain distribution in the structure S is displayed as an image.
- the first and second remote display sections 12 and 13 enable the analysis physical quantity to be obtained regardless of the installation location of the numerical analysis section 5.
- the structure monitoring system according to the present embodiment has been described above.
- the structure monitoring system according to the present invention is not limited to the above embodiments, and various modifications may be made without departing from the gist of the structure monitoring system. Is possible. For example, the following changes are possible.
- distortion or temperature is analyzed as a physical quantity, but the physical quantity to be analyzed is not limited to this. Waves, flows, displacements, tractions, and the like such as may be used.
- the L ap 1 a c e equation, the P i s s s o n equation, the He 1 m h o 1 t z equation, and the like are used as governing equations for each physical quantity.
- the optical fiber sensor is improved to measure each physical quantity using the optical fiber sensor.
- the monitoring target is a magnetic field
- the optical fiber sensor is covered with a magnetostrictive member that is deformed according to the magnetic force.
- the magnetic field can be calculated by the measuring unit using the optical fiber sensor.
- the structure is viewed as a two-dimensional problem while the structure is viewed two-dimensionally.
- the structure may be viewed as a three-dimensional problem as viewed three-dimensionally.
- the basic solution or the modelling of the structure for example, the boundary element division and the method of obtaining nodes are different, but these are known as the boundary element method, and the description thereof is omitted here.
- the structure monitoring system 1 monitors the change in the physical quantity of the entire structure.
- the monitoring range is not limited to the entire structure, and a part of the structure is monitored. It may be.
- the monitoring range (analysis range) is specified via the setting input unit 9.
- the numerical analysis method executed by the numerical analysis unit 5 is not limited to the one in each of the above embodiments.
- any other known numerical analysis method such as the finite element method may be used as long as the boundary condition is set and the numerical analysis is performed using the boundary condition.
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- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/562,922 US7542856B2 (en) | 2003-07-02 | 2003-07-02 | Structure monitor system |
PCT/JP2003/008395 WO2005003689A1 (ja) | 2003-07-02 | 2003-07-02 | 構造体監視システム |
CNB038267306A CN100458371C (zh) | 2003-07-02 | 2003-07-02 | 结构体监视系统 |
AU2003304295A AU2003304295A1 (en) | 2003-07-02 | 2003-07-02 | Structure monitor system |
EP03741148.5A EP1645851B1 (en) | 2003-07-02 | 2003-07-02 | Structure monitor system |
JP2005503378A JP4495672B2 (ja) | 2003-07-02 | 2003-07-02 | 構造体監視システム |
Applications Claiming Priority (1)
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PCT/JP2003/008395 WO2005003689A1 (ja) | 2003-07-02 | 2003-07-02 | 構造体監視システム |
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WO2005003689A1 true WO2005003689A1 (ja) | 2005-01-13 |
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PCT/JP2003/008395 WO2005003689A1 (ja) | 2003-07-02 | 2003-07-02 | 構造体監視システム |
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Country | Link |
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US (1) | US7542856B2 (ja) |
EP (1) | EP1645851B1 (ja) |
JP (1) | JP4495672B2 (ja) |
CN (1) | CN100458371C (ja) |
AU (1) | AU2003304295A1 (ja) |
WO (1) | WO2005003689A1 (ja) |
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- 2003-07-02 EP EP03741148.5A patent/EP1645851B1/en not_active Expired - Lifetime
- 2003-07-02 US US10/562,922 patent/US7542856B2/en active Active
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Also Published As
Publication number | Publication date |
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JPWO2005003689A1 (ja) | 2006-08-17 |
US7542856B2 (en) | 2009-06-02 |
CN100458371C (zh) | 2009-02-04 |
EP1645851A4 (en) | 2006-07-05 |
EP1645851B1 (en) | 2013-10-23 |
US20080177482A1 (en) | 2008-07-24 |
EP1645851A1 (en) | 2006-04-12 |
CN1802551A (zh) | 2006-07-12 |
JP4495672B2 (ja) | 2010-07-07 |
AU2003304295A1 (en) | 2005-01-21 |
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