Method and System for Data Processing of Strain Optical Cables for Cable Stress Monitoring

Abstract

This invention relates to the field of bridge health monitoring technology, specifically to a strain-sensitive optical cable data processing method and system for monitoring cable tension. The method includes: calculating the initial cable tension based on catenary theory during the empty cable stage; calculating the first cable tension based on the initial tension during the cable clamp installation stage; calculating the second cable tension based on the initial tension during the main girder hoisting stage; calculating the third cable tension based on the initial tension during the second-stage dead load application stage; calculating a final sensitivity coefficient based on the first, second, and third cable tensions and their corresponding first, second, and third wavelength values; and collecting real-time wavelength values ​​during cable operation and calculating the current cable tension based on the real-time wavelength values ​​and the final sensitivity coefficient. This application eliminates the need for external sensors, provides highly accurate monitoring of cable tension, and improves the safety of cable use.

Description

Technical Field

[0001] This invention relates to the field of bridge health monitoring technology, specifically to a strain optical cable data processing method and system for cable tension monitoring. Background Technology

[0002] With the continuous development of fiber optic sensing technology, there are increasingly more engineering cases using fiber optic sensors for structural health monitoring in civil engineering. In bridge cable tension monitoring, many projects embed weak grating array strain sensing optical cables along their entire length into the bridge cables for intensive tension monitoring. However, the strain sensitivity of the fiber optic cable differs after embedding compared to before embedding. Since the cables themselves are very long (e.g., the main cable of a suspension bridge can be several kilometers long), it is impossible to perform tensioning calibration on a test platform in the factory to obtain the strain sensitivity of each strain grating sensor along the embedded cable. Therefore, in practical engineering applications, the strain grating sensitivity of the fiber optic cable before embedding is often simply used to calculate the cable tension, resulting in low accuracy in tension monitoring and failing to utilize the measurement characteristics of fiber optic sensors.

[0003] In addition, there is a method of adding auxiliary sensors such as acceleration sensors or pressure rings to the cable to mark and correct the strain optical cable measurement results. Although this method can improve the measurement accuracy to a certain extent, it requires the purchase and installation of additional sensors, which is costly. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the aforementioned background technology and provide a method and system for processing strain optical cable data for cable tension monitoring.

[0005] The technical solution of this application is: a method for processing strain optical cable data for cable tension monitoring, comprising, During the empty cable stage, the initial wavelength values ​​of each optical grating are collected based on the optical cables arranged along the entire length of the cable, and the initial cable force of the cable during the empty cable stage is calculated based on the catenary theory. During the cable clamp installation phase, the first wavelength value of the optical cable grating is collected after the cable clamp is installed, and the first cable force of the cable is calculated based on the initial cable force. During the main beam hoisting stage, the second wavelength value of the optical fiber grating is collected, and the second cable force of the cable is calculated based on the initial cable force. During the second phase of constant load application, the third wavelength value of the optical fiber grating is collected after the bridge deck pavement load is applied, and the third cable force of the cable is calculated based on the initial cable force. The final sensitivity coefficient is calculated based on the first cable force, the second cable force, the third cable force, and the corresponding first wavelength value, second wavelength value, and third wavelength value. During the cable's operational service, real-time wavelength values ​​are collected, and the current cable force is calculated based on the real-time wavelength values ​​and the final sensitivity coefficient.

[0006] According to the strain-optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the initial cable tension in the empty cable stage based on the catenary theory includes: calculating the initial cable tension according to the following formula.

[0007] in: F 0 —Initial cable force; q —Cable linear density; L —Cable span; h —Cable sag in the empty cable state; s — The length of the cable without stress.

[0008] According to the strain-optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the first cable tension based on the initial cable tension includes: calculating the first cable tension according to the following formula.

[0009] in: F E —First tension; F 0 —Initial cable force; P E ——No. E Individual cable clamp load; θ k —Installation of the first E The inclination angle of the corresponding cable segment after each cable clamp.

[0010] According to the strain-optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the second cable tension based on the initial cable tension includes: calculating the second cable tension according to the following formula.

[0011] in: F p —Second tension; F 0 —Initial cable force; G P ——No. P The weight of the beam segment; φ P ——No.P The angle between the suspender and the cable where the main cable section is located.

[0012] According to the strain optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the third cable tension based on the initial cable tension includes: calculating the third cable tension according to the following formula.

[0013] in: F Q —The third cable; F 0 —Initial cable force; W eq —Equivalent uniformly distributed load on the second phase of the dead load bridge deck pavement; f —Sagging of the cable-stayed bridge after completion at mid-span; L —Cable span.

[0014] According to the strain optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the final sensitivity coefficient based on the first cable force, second cable force, third cable force and the corresponding first wavelength value, second wavelength value and third wavelength value includes: calculating the local sensitivity coefficient of each stage based on the wavelength values ​​and corresponding cable forces of the cable clamp installation stage, the main beam hoisting stage and the second-stage constant load application stage; and calculating the final sensitivity coefficient based on the local sensitivity coefficient of each stage.

[0015] According to the strain optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the local sensitivity coefficient of each stage based on the wavelength values ​​and corresponding cable tension during the cable clamp installation stage, the main beam hoisting stage, and the secondary constant load application stage includes: calculating the local sensitivity coefficient of each stage according to the following formula.

[0016] in: K j i ——No. j The first stage of optical cable i The local sensitivity coefficient of each grating; W j i ——No. j The first stage of optical cable i The wavelength values ​​of each grating; W j-1 i ——No. j-1 stage on the optical cable i The wavelength values ​​of each grating; ——No. j The first stage of the cable i The theoretical cable force calculated at each grating location; ——No. j -1 stage cable i The theoretical cable force calculated at each grating location.

[0017] According to the strain optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the final sensitivity coefficient based on the local sensitivity coefficients at each stage includes: calculating the final sensitivity coefficient according to the following formula.

[0018] in: —The final sensitivity coefficient of the i-th grating on the strain gauge; K j i ——No. j The first stage of optical cable i The local sensitivity coefficient of each grating; ω j ——No. j Weighting coefficients for each stage.

[0019] According to the strain optical cable data processing method for cable tension monitoring provided in this application, the method for calculating the current cable tension based on the real-time wavelength value and the final sensitivity coefficient includes: calculating the current cable tension according to the following formula.

[0020] in: ——Current moment t The corresponding cable i The cable force value measured by each grating; F 0 —Initial cable force; γ i —Reliability weighting coefficient ,in For strain optical cable i The standard deviation of the sensitivity of a strain fiber Bragg grating; —The final sensitivity coefficient of the i-th grating on the strain gauge; W ti —The first time at time t i The wavelength values ​​of each grating; W 0 i —Initial time, under empty cable state, the first i The wavelength value of each grating.

[0021] This application also relates to a strain-optical cable data processing system for cable tension monitoring, wherein the processing system operates according to the above-described strain-optical cable data processing method for cable tension monitoring. include, The data acquisition module includes an optical cable embedded in the cable and arranged along its entire length for acquiring the wavelength values ​​of the optical cable grating at various stages of the cable. The initial calculation module calculates the initial cable force based on the catenary theory; The first calculation module calculates the first cable force of the cable during the cable clamp installation stage based on the initial cable force. The second calculation module calculates the second cable force of the cable during the main beam hoisting stage based on the initial cable force. The third calculation module calculates the third cable force of the cable during the second-stage constant load application phase based on the initial cable force. The final sensitivity coefficient determination module calculates the final sensitivity coefficient based on the first cable force, the second cable force, the third cable force, and the wavelength values ​​of the optical fiber grating at each stage collected by the data acquisition module. The current cable force calculation module is used to calculate the current cable force based on the collected real-time wavelength value and the final sensitivity coefficient during the operation and service of the cable.

[0022] The advantages of this application are as follows: 1. This application relates to a strain optical cable data processing method for cable tension monitoring. The processing method of this application relies on the characteristics of the catenary theory to accurately solve the theoretical cable tension. It makes full use of the characteristic that the cable tension is constantly changing under the external load during the cable construction stage. Without the aid of external sensors, it accurately obtains the sensitivity of each grating of the strain optical grating in the cable, ensuring accurate processing and calculation of cable tension during the operation period. The whole processing method is simple, does not require the configuration of external sensors, and is very accurate in monitoring cable tension, thus improving the safety of cable use. 2. This application uses the catenary theory to accurately solve the initial cable force in the empty cable stage. The entire calculation method is simple, the calculation results are accurate, and it is convenient for further processing of the collected data. 3. This application calculates the first cable force through the initial cable force during the cable clamp installation stage. The entire calculation method is simple and can quickly obtain the cable force situation during the cable clamp installation stage. 4. This application calculates the second cable force through the initial cable force during the main beam hoisting stage. The entire calculation method is simple and can quickly obtain the cable force situation during the main beam hoisting stage. 5. In this application, the third cable force is calculated from the initial cable force during the second-stage dead load application stage. The entire calculation method is simple and can quickly obtain the cable force situation during the second-stage dead load application stage. 6. This application calculates the final sensitivity coefficient by measuring the cable force and wavelength values ​​at different stages. Without the aid of external sensors, the sensitivity of each strain grating in the cable is accurately obtained through the designed algorithm. 7. When calculating the final sensitivity coefficient, this application first determines the local sensitivity coefficient of each stage, which can accurately obtain the sensitivity of the local grating of each stage of the cable without the aid of any external sensors. 8. This application integrates the local sensitivity coefficients of each stage and finally obtains the final sensitivity coefficient. The overall calculation is simple and greatly facilitates the calculation of the actual cable force required in subsequent actual use. 9. This application uses a specially designed algorithm to easily calculate the actual cable force by combining the actual wavelength value collected with the final sensitivity coefficient. The overall calculation is very simple and facilitates subsequent monitoring of the cable force. 10. This application also relates to a processing system that integrates the above-mentioned processing methods and can be integrated into a cable monitoring system to automatically monitor cable tension, thereby improving the intelligence of cable use.

[0023] The proposed method for monitoring cable tension using an embedded optical cable can accurately obtain the sensitivity of each strain grating within the cable without the aid of external sensors. This ensures precise calculation and processing of cable tension during operation. The entire process is simple, requires no external sensors, and provides highly accurate monitoring of cable tension, thereby enhancing the safety of cable use. Attached Figure Description

[0024] Figure 1 : Flowchart of the strain optical cable data processing method for cable tension monitoring in this application. Detailed Implementation

[0025] The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] This application relates to a strain-sensitive optical cable data processing method for cable tension monitoring. The method involves embedding a continuous optical cable within the cable. By collecting wavelength values ​​of the optical cable grating at various stages, the cable tension at each stage can be obtained based on catenary theory. A comprehensive analysis of the cable tension at each stage, combined with the wavelength values, yields the final sensitivity coefficient, ensuring accurate cable tension calculation during operation. The entire process is simple, requires no external sensors, and provides highly accurate cable tension monitoring, thus improving cable safety. The embedded optical cable can acquire cable tension data in real-time during actual use, eliminating the need for external sensors.

[0030] Specifically, this application provides a strain optical cable data processing method for cable tension monitoring, such as... Figure 1 As shown, follow these steps: S1. During the empty cable stage, the initial wavelength values ​​of each optical grating are collected based on the optical cables arranged along the entire length of the cable, and the initial cable force of the cable during the empty cable stage is calculated based on the catenary theory. Based on the catenary theory, the initial cable force during the empty cable stage can be accurately obtained. The initial cable force corresponds to the empty cable situation, that is, the state when no other loads are attached to the cable. S2. During the cable clamp installation stage, after the cable clamp is installed, the first wavelength value of the optical cable grating is collected, and the first cable force of the cable is calculated based on the initial cable force. During the cable clamp installation phase, multiple cable clamps are installed on the cable, which changes the cable's structural form and its cable force compared to the empty cable state. The first cable force during the cable clamp installation phase can be calculated by combining the initial cable force. S3. During the main beam hoisting stage, the second wavelength value of the optical cable grating is collected, and the second cable force of the cable is calculated based on the initial cable force. When the main beam is hoisted, the cables begin to bear the load, and the load of the main beam is transferred to the cables. The shape of the cables changes drastically, and is completely different from the empty cable state and the cable clamp installation state when they were not bearing any load. At this time, the second cable force can be calculated by combining the initial cable force. S4. During the second phase of constant load application, after the bridge deck pavement load is applied, the third wavelength value of the optical cable grating is collected, and the third cable force of the cable is calculated based on the initial cable force. When the bridge deck pavement is applied, the load on the cables increases further, and changes compared to the main girder hoisting stage. The third cable force can be calculated by combining the initial cable force. S5. Calculate the final sensitivity coefficient based on the first cable force, the second cable force, the third cable force, and the corresponding first wavelength value, second wavelength value, and third wavelength value; By comprehensively analyzing the cable force and wavelength values ​​at different stages, the final sensitivity coefficient of the cable can be accurately determined. In fact, the cable force changes at different stages, and the corresponding wavelength values ​​also change. By comprehensively analyzing this change, the relationship between the wavelength value change and the cable force change can be obtained, and the sensitivity coefficient of a certain grating under the two stages can be obtained. Then, by performing a weighted analysis on the sensitivity coefficients of all gratings, the final sensitivity coefficient can be obtained. S6. During the operation and service of the cable, collect real-time wavelength values ​​and calculate the current cable force based on the real-time wavelength values ​​and the final sensitivity coefficient; Based on the final sensitivity coefficient and the real-time acquired wavelength value, the real-time cable force can be accurately obtained. This allows for monitoring of the cable force entirely through the optical cable, without the need for external sensors.

[0031] In some embodiments of this application, step S1 described above has been optimized. Specifically, the method for calculating the initial cable force in the empty cable stage based on the catenary theory is as follows: the initial cable force is calculated according to the following formula.

[0032] in: F 0 —Initial cable force, in kN; q —Cable linear density, unit: kg / m; L —Cable span, in meters; h — Cable sag in unloaded state, in meters; s — Stress-free length of the cable, in meters (m).

[0033] During the cable fabrication stage, an optical fiber is embedded within the cable, running the entire length of the cable. This allows the optical fiber to collect wavelength information at every location within the cable. An information collection device is then connected to the end of the optical fiber to receive the wavelength values ​​transmitted through the optical fiber grating.

[0034] This embodiment, based on the catenary theory and the formula described above, can accurately obtain the initial cable force in the case of an optical cable. The initial cable force is the basis for subsequent calculations and analyses.

[0035] In a further embodiment of this application, step S2 described above is optimized. Specifically, the method for calculating the first cable force based on the initial cable force is as follows: the first cable force is calculated according to the following formula.

[0036] in: F E —First cable force, unit: kN; F 0 —Initial cable force, in kN; P E ——No. E Each cable clamp load, in kg, is obtained by weighing at the factory; θ k —Installation of the first E The inclination angle of the corresponding cable segment after each cable clamp, in degrees, is determined by on-site measurement.

[0037] The installation time can be calculated using the formula above. E The cable tension after each clamp installation is called the first cable tension, which corresponds to the cable tension during the clamp installation phase. The first cable tension is specific to the clamp installation; each clamp installation corresponds to a first cable tension.

[0038] In a preferred embodiment of this application, step S3 described above is optimized. Specifically, the method for calculating the second cable force based on the initial cable force includes: calculating the second cable force according to the following formula.

[0039] in: F p —Second tension, unit: kN; F0 —Initial cable force, in kN; G P ——No. P The weight of the beam segment, in kg, is determined by weighing at the time of manufacture. φ P ——No. P The angle between the suspender and the main cable of the section, in degrees, is determined by on-site measurement.

[0040] The second cable force corresponds to the beam segment installation stage. Data is collected and the corresponding second cable force is calculated every time a beam segment is installed.

[0041] In a further embodiment of this application, step S3 described above is optimized. Specifically, the method for calculating the third cable force based on the initial cable force includes: calculating the third cable force according to the following formula.

[0042] in: F q —Third tension, unit: kN; F 0 —Initial cable force, in kN; W eq —Equivalent uniformly distributed load, unit kN / m 2 Determined by taking the design load or on-site measurement; f — Cable sag after bridge completion, in meters, determined by design sag or on-site measurement; L —Cable span, in meters.

[0043] The third cable force corresponds to the second-phase dead load stage. During the second-phase dead load stage, when the bridge deck is paved, the corresponding third cable force is calculated for each section of the bridge deck is paved.

[0044] In some embodiments of this application, step S3 described above has been optimized. Specifically, the method for calculating the final sensitivity coefficient based on the first cable force, the second cable force, the third cable force, and the corresponding first wavelength value, second wavelength value, and third wavelength value is as follows: Based on the wavelength values ​​and corresponding cable forces during the cable clamp installation stage, the main beam hoisting stage, and the second-stage dead load application stage, the local sensitivity coefficients for each stage are calculated. The local sensitivity coefficients for each stage are then calculated using the following formula.

[0045] in: Kj i ——No. j The first stage of optical cable i The local sensitivity coefficient of each grating, in nm / kN; W j i ——No. j The first stage of optical cable i The wavelength values ​​of each grating, in nm; W j-1 i ——No. j -1 stage on the optical cable i The wavelength values ​​of each grating, in nm; ——No. j The first stage of the cable i The theoretical cable force calculated at each grating, in kN; ——No. j -1 stage cable i The theoretical cable force calculated at each grating location, in kN.

[0046] The local sensitivity coefficient is actually the ratio of the wavelength difference of the same grating at two different stages to the corresponding cable force difference. The cable force changes at different stages, and the wavelength value collected by the corresponding grating also changes. By collecting the changes in wavelength value and cable force at different stages, the local sensitivity coefficient of the corresponding grating can be analyzed.

[0047] Then, the final sensitivity coefficient is calculated based on the local sensitivity coefficients at each stage, using the following formula.

[0048] in: —The final sensitivity coefficient of the i-th grating on the strain gauge cable, in nm / kN; K j i ——No. j The first stage of the cable i The local sensitivity coefficient of each grating; ω j ——No. j Weighting coefficients for each stage.

[0049] Among them, the first j Weighting coefficients for each stage ω jIt can be obtained using the following methods: .

[0050] Based on the above method, the final sensitivity coefficient can be obtained. The final sensitivity coefficient reflects the correspondence between the optical cable grating and the cable force. Because this embodiment is calculated by collecting the cable force and wavelength values ​​of the optical cable at various stages, the final sensitivity coefficient can truly reflect the relationship between the wavelength value of the optical cable grating and the cable force.

[0051] In other embodiments of this application, step S3 described above has been optimized. Specifically, the method for calculating the current cable force based on the real-time wavelength value and the final sensitivity coefficient is as follows: the current cable force is calculated according to the following formula.

[0052] in: ——Current moment t The corresponding cable i The cable force value measured by each grating, in kN; F 0 —Initial cable force; γ i —Reliability weighting coefficient ,in For strain optical cable i The standard deviation of the sensitivity of a strain fiber Bragg grating; —The final sensitivity coefficient of the i-th grating on the strain gauge cable, in nm / kN; W t i —The first time at time t i The wavelength values ​​of each grating; W 0 i —Initial time, under empty cable state, the first i The wavelength value of each grating is measured in nm. The initial time refers to the time when the wavelength value is first collected after the cable installation is completed and the cable is officially put into operation.

[0053] Based on the above method, the cable tension of the entire cable can be monitored in real time according to the final sensitivity coefficient. The optical fiber grating is transformed into a cable tension sensor monitoring device, which improves the utilization of the equipment and ensures accurate processing and calculation of cable tension during operation.

[0054] In addition, this application also relates to a strain optical cable data processing system for cable tension monitoring, comprising a data acquisition module, an initial calculation module, a first calculation module, a second calculation module, a third calculation module, a final sensitivity coefficient determination module, and a current cable tension calculation module. The data acquisition module includes an optical cable embedded in the cable along its entire length for acquiring wavelength values ​​of the optical cable grating at various stages of the cable. The initial calculation module calculates the initial cable tension based on the catenary theory. The first calculation module calculates the first cable tension during the cable clamp installation stage based on the initial cable tension. The second calculation module calculates the second cable tension during the main beam hoisting stage based on the initial cable tension. The third calculation module calculates the third cable tension during the second-stage constant load application stage based on the initial cable tension. The final sensitivity coefficient determination module calculates the final sensitivity coefficient based on the first, second, and third cable tensions and the wavelength values ​​of the optical cable grating at each stage acquired by the data acquisition module. The current cable tension calculation module is used to calculate the current cable tension during cable operation based on the acquired real-time wavelength values ​​and the final sensitivity coefficient.

[0055] This invention also provides a non-transitory computer-readable storage medium storing a computer program. The computer program includes program instructions that, when executed by a processor, implement the various steps of the method described in this invention, which will not be elaborated further here.

[0056] The computer-readable storage medium can be the data transmission apparatus or the internal storage unit of a computer device provided in any of the foregoing embodiments, such as the hard disk or memory of the computer device. The computer-readable storage medium can also be the external storage device of the computer device, such as the plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the computer device.

[0057] Furthermore, the computer-readable storage medium may include both internal storage units and external storage devices of the computer device. The computer-readable storage medium is used to store the computer program and other programs and data required by the computer device. The computer-readable storage medium may also be used to temporarily store data that is to be output or has already been output.

[0058] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0059] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0060] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0061] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0062] This invention also provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the steps of the strain optical cable data processing method for cable tension monitoring. Contents not described in detail in this specification are prior art known to those skilled in the art.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A method for processing strain optical cable data for cable tension monitoring, characterized in that: include, During the empty cable stage, the initial wavelength values ​​of each optical grating are collected based on the optical cables arranged along the entire length of the cable, and the initial cable force of the cable during the empty cable stage is calculated based on the catenary theory. During the cable clamp installation phase, the first wavelength value of the optical cable grating is collected after the cable clamp is installed, and the first cable force of the cable is calculated based on the initial cable force. During the main beam hoisting stage, the second wavelength value of the optical fiber grating is collected, and the second cable force of the cable is calculated based on the initial cable force. During the second phase of constant load application, the third wavelength value of the optical fiber grating is collected after the bridge deck pavement load is applied, and the third cable force of the cable is calculated based on the initial cable force. The final sensitivity coefficient is calculated based on the first cable force, the second cable force, the third cable force, and the corresponding first wavelength value, second wavelength value, and third wavelength value. During the cable's operational service, real-time wavelength values ​​are collected, and the current cable force is calculated based on the real-time wavelength values ​​and the final sensitivity coefficient. The method for calculating the final sensitivity coefficient based on the first cable force, second cable force, third cable force, and corresponding first wavelength value, second wavelength value, and third wavelength value includes: calculating the local sensitivity coefficient for each stage based on the wavelength values ​​and corresponding cable forces during the cable clamp installation stage, the main beam hoisting stage, and the second-stage dead load application stage; and calculating the final sensitivity coefficient based on the local sensitivity coefficients for each stage. The method for calculating the local sensitivity coefficient for each stage based on the wavelength values ​​and corresponding cable forces during the cable clamp installation stage, the main beam hoisting stage, and the second-stage dead load application stage includes: calculating the local sensitivity coefficient for each stage according to the following formula. in: K j i ——No. j The first stage of optical cable i The local sensitivity coefficient of each grating; W j i ——No. j The first stage of optical cable i The wavelength values ​​of each grating; W j-1 i ——No. j -1 stage on the optical cable i The wavelength values ​​of each grating; ——No. j The first stage of the cable i The theoretical cable force calculated at each grating location; ——No. j -1 stage cable i The theoretical cable force calculated at each grating location; The method for calculating the final sensitivity coefficient based on the local sensitivity coefficients at each stage includes: calculating the final sensitivity coefficient according to the following formula. in: —The final sensitivity coefficient of the i-th grating on the strain gauge; K j i ——No. j The first stage of optical cable i The local sensitivity coefficient of each grating; ω j ——No. j Weighting coefficients for each stage.

2. The strain optical cable data processing method for cable tension monitoring as described in claim 1, characterized in that: The method for calculating the initial cable force in the empty cable stage based on the catenary theory includes: calculating the initial cable force according to the following formula. in: F 0 —Initial cable force; q —Cable linear density; L —Cable span; h —Cable sag in the empty cable state; s — The length of the cable without stress.

3. The strain optical cable data processing method for cable tension monitoring as described in claim 1, characterized in that: The method for calculating the first cable force based on the initial cable force includes: calculating the first cable force according to the following formula. in: F E —First tension; F 0 —Initial cable force; P E ——No. E Individual cable clamp load; θ k —Installation of the first E The inclination angle of the corresponding cable segment after each cable clamp.

4. The strain optical cable data processing method for cable tension monitoring as described in claim 1, characterized in that: The method for calculating the second cable force based on the initial cable force includes: calculating the second cable force according to the following formula. in: F p —Second tension; F 0 —Initial cable force; G P ——No. P The weight of the beam segment; φ P ——No. P The angle between the suspender and the cable where the main cable section is located.

5. The strain optical cable data processing method for cable tension monitoring as described in claim 1, characterized in that: The method for calculating the third cable force based on the initial cable force includes: calculating the third cable force according to the following formula, in: F Q —The third cable; F 0 —Initial cable force; W eq —Equivalent uniformly distributed load on the second phase of the dead load bridge deck pavement; f —Sagging of the cable-stayed bridge after completion at mid-span; L —Cable span.

6. The strain optical cable data processing method for cable tension monitoring as described in claim 1, characterized in that: The method for calculating the current cable force based on the real-time wavelength value and the final sensitivity coefficient includes: calculating the current cable force according to the following formula, in: —The cable force value measured by the i-th grating on the cable at the current time t; F 0 —Initial cable force; γ i —Reliability weighting coefficient ,in For strain optical cable i The standard deviation of the sensitivity of a strain fiber Bragg grating; —The final sensitivity coefficient of the i-th grating on the strain gauge; W t i —The first time at time t i The wavelength values ​​of each grating; W 0 i —Initial time, under empty cable state, the first i The wavelength value of each grating.

7. A strain-sensitive optical cable data processing system for monitoring cable tension, characterized in that: The processing system operates according to the strain optical cable data processing method for cable tension monitoring as described in any one of claims 1 to 6, including: The data acquisition module includes an optical cable embedded in the cable and arranged along its entire length for acquiring the wavelength values ​​of the optical cable grating at various stages of the cable. The initial calculation module calculates the initial cable force based on the catenary theory; The first calculation module calculates the first cable force of the cable during the cable clamp installation stage based on the initial cable force. The second calculation module calculates the second cable force of the cable during the main beam hoisting stage based on the initial cable force. The third calculation module calculates the third cable force of the cable during the second-stage constant load application phase based on the initial cable force. The final sensitivity coefficient determination module calculates the final sensitivity coefficient based on the first cable force, the second cable force, the third cable force, and the wavelength values ​​of the optical fiber grating at each stage collected by the data acquisition module. The current cable force calculation module is used to calculate the current cable force based on the collected real-time wavelength value and the final sensitivity coefficient during the operation and service of the cable.

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