A distributed fiber based carbon fiber composite cable detection system and method

Abstract

The application provides a kind of carbon fiber composite cable detection system and method based on distributed optical fiber, and relates to the field of structural engineering damage detection.The application solves the problems of complex operation of embedded optical fiber sensor during cable production stage, repair and replacement of optical fiber sensor, improves the laying efficiency of optical fiber sensor, and realizes the global contact type strain accurate monitoring of cable anchorage section and cable body section of carbon fiber composite cable by designing different laying forms of optical fiber sensor modules, breaks through the technical difficulty that strain information in clamping type cable anchorage zone cannot be measured, improves the installation efficiency and accuracy of anchorage device, realizes real-time dynamic strain monitoring during the whole service life of carbon fiber composite cable, and finally establishes a cable force calculation method for carbon fiber composite cable to predict the local damage law of carbon fiber composite cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of structural engineering damage detection, and in particular to a carbon fiber composite cable detection system and method based on distributed optical fibers. BACKGROUND

[0002] As a representative high-performance engineering material that has developed rapidly in recent years, the structural reinforcement theory, design method and construction technology of carbon fiber reinforced polymer (CFRP) tend to be mature and are widely used. New structural theories and methods have also made important progress and shown broad application prospects. For long-span bridge structures, the strength of carbon fiber composite cables is 30%-50% higher than that of steel cables, and the weight is only about 1 / 5 of that of steel, achieving ultra-low self-weight effect. Therefore, in recent years, carbon fiber composite cables have been continuously developed in research and practice due to their advantages of light weight, high strength, corrosion resistance, fatigue resistance, and small temperature deformation. Their structural reinforcement theory, design method and construction technology tend to be mature and are widely used.

[0003] However, as the service life continues to grow, corrosion damage and broken cables are increasingly prominent, seriously affecting the safety and durability of the cables. And the anchoring system is usually sealed in service state, and the traditional detection method relies on local sensors, which is difficult to capture the strain distribution of the cable under complex load. The visual detection method in the prior art mainly uses visual inspection to periodically check whether the cable system is subject to erosion and damage, which is time-consuming, requires a lot of manpower and resources, and the detection results are greatly affected by human factors, and internal defects of the cable cannot be detected; The magnetic flux leakage detection method in the prior art has the advantages of accurate positioning and high detection precision, but can only realize detection in the sensor coverage area, cannot realize cable detection in the anchoring area, and is only suitable for steel cables (such as parallel steel wire cables), not suitable for CFRP cables; The ultrasonic guided wave technology can realize full-structure and long-distance detection of the cable, and the defect detection signal has high recognition, but there are few reports on the use of ultrasonic guided wave for cable defect detection, mainly due to the incomplete analysis of the wave characteristics of the cable and the difficulty in developing special sensors, and the ultrasonic detection technology for CFRP cables and anchors is lacking. SUMMARY

[0004] To solve the problems in the prior art, the application provides a distributed optical fiber-based carbon fiber composite cable detection system and method. The application solves the problems of complex operation of pre-buried optical fiber sensors during the production stage of the cable, repair and replacement of the optical fiber sensors, and the like, improves the laying efficiency of the optical fiber sensors, and realizes full-area contact type strain accurate monitoring of the cable anchoring section and the cable body section of the carbon fiber composite cable by designing different laying modes of the optical fiber sensor modules, breaks through the technical difficulty that strain information in the clamping type cable anchoring area cannot be measured, improves the anchorage installation efficiency and accuracy, realizes real-time dynamic strain monitoring during the whole service life of the carbon fiber composite cable, and finally, a cable force calculation method of the carbon fiber composite cable is established, and local damage rules of the carbon fiber composite cable are predicted. To achieve the above-mentioned purposes, the technical scheme is as follows:

[0005] In one aspect, the application provides a distributed optical fiber-based carbon fiber composite cable detection system, which comprises:

[0006] An optical fiber sensor module for distributed detection and transmission of strain information of the carbon fiber composite cable;

[0007] A carbon fiber composite cable anchoring module for fixing the carbon fiber composite cable and the optical fiber sensor module;

[0008] A signal demodulation module for demodulating strain information of the optical fiber sensor module;

[0009] A data processing and display module for obtaining real-time strain data of the carbon fiber composite cable and local damage rules and cable force information of the carbon fiber composite cable according to demodulation data of the signal demodulation module and displaying the data.

[0010] Optionally, the optical fiber sensor module comprises:

[0011] An optical fiber sensing unit for distributed detection of strain information of the carbon fiber composite cable;

[0012] An optical fiber transmission unit for transmission of strain information detected by the optical fiber sensing unit.

[0013] Optionally, the anchoring process of the carbon fiber composite cable anchoring module comprises:

[0014] According to the carbon fiber composite cable, a carbon fiber composite cable clamping type anchoring process is selected to obtain an anchoring scheme of the carbon fiber composite cable;

[0015] According to the anchoring scheme of the carbon fiber composite cable, the optical fiber sensor module is laid to obtain a carbon fiber composite cable with both ends not anchored;

[0016] According to the two-end unanchored carbon fiber composite plate, parallel cable anchor clamps are respectively installed at both ends to obtain a carbon fiber composite plate cable anchor module.

[0017] Optionally, the carbon fiber composite plate cable anchoring scheme comprises a cable anchor clamp grooving process scheme and a cable anchor segment plate grooving process scheme.

[0018] In the cable anchor segment plate grooving process scheme, the end of the groove is provided with a transition section.

[0019] Optionally, the layout form of the optical fiber sensor module comprises a cable anchor segment layout optical fiber sensor module and a cable body segment layout optical fiber sensor module.

[0020] Optionally, the cable anchor segment layout optical fiber sensor module comprises a transverse layout optical fiber sensor module and a longitudinal layout optical fiber sensor module.

[0021] The transverse layout optical fiber sensor module is laid along a direction perpendicular to the length direction of the carbon fiber composite plate cable, and different columns of the optical fiber sensor modules are sequentially connected and then connected with the cable body segment layout optical fiber sensor module.

[0022] The longitudinal layout optical fiber sensor module is laid along a direction parallel to the length direction of the carbon fiber composite plate cable, and different rows of the optical fiber sensor modules are sequentially connected and then connected with the cable body segment layout optical fiber sensor module.

[0023] Optionally, the layout process of the cable body segment layout optical fiber sensor module comprises:

[0024] The surface of the cable body segment is wiped clean and the optical fiber sensor module is positioned to obtain a cable body segment to be laid with optical fibers.

[0025] According to the cable body segment to be laid with optical fibers, the optical fiber sensor module is aligned and laid using a glue pouring mold to obtain a cable body segment with fixed optical fiber sensors.

[0026] According to the cable body segment with fixed optical fiber sensors, the epoxy resin glue is poured into the glue pouring mold, the epoxy resin glue is naturally solidified, and the glue pouring mold is removed to obtain a cable body segment layout optical fiber sensor module.

[0027] Optionally, according to the two-end unanchored carbon fiber composite plate, parallel cable anchor clamps are respectively installed at both ends to obtain a carbon fiber composite plate cable anchor module, comprising:

[0028] According to the two-end unanchored carbon fiber composite plate, the signal demodulation module and the data processing and display module are connected to obtain a cable anchor clamp installation detection device.

[0029] According to the plate cable anchorage clamp installation detection device, the plate cable anchorage clamp is installed and the strain data of the carbon fiber composite plate cable is detected in real time to obtain the strain data set during the installation of the plate cable anchorage clamp.

[0030] Based on the strain dataset during the installation of the plate-cable anchoring clamp, the installation scheme of the anchoring clamp is adjusted to ensure that the carbon fiber composite plate-cable inside the anchoring clamp is subjected to uniform force and symmetrical force along the axis of the carbon fiber composite plate-cable, thus obtaining the carbon fiber composite plate-cable anchoring module.

[0031] Optionally, based on the demodulated data from the signal demodulation module, the mechanical property dataset of the carbon fiber composite plate and cable and the local damage pattern of the carbon fiber composite plate and cable are obtained, including:

[0032] Based on the demodulation data from the signal demodulation module, a dataset of strain distribution obtained by fiber optic sensors at different cross-sectional positions of carbon fiber composite plates and cables is obtained.

[0033] Based on the strain distribution dataset of fiber optic sensors at different cross-sectional positions of the carbon fiber composite plate, the total stress distribution dataset of the carbon fiber composite plate is obtained using formula (1).

[0034]

[0035] In the formula: This represents the total average stress in the carbon fiber composite sheet / cable. Let be the average strain of the i-th fiber optic sensor at different cross-sectional positions of the carbon fiber composite plate / cable over the entire length of the plate / cable segment, n be the number of fiber optic sensor modules, and E be the Young's modulus of the carbon fiber composite plate / cable.

[0036] Based on the total stress distribution dataset of the carbon fiber composite plate and cable, the mechanical property dataset of the carbon fiber composite plate and cable is obtained through formula (2).

[0037]

[0038] Where: T is the cable force of the carbon fiber composite sheet / cable, and A is the cross-sectional area of ​​the carbon fiber composite sheet / cable;

[0039] Based on the strain distribution dataset of fiber optic sensors at different cross-sectional positions of the carbon fiber composite plate and cable and the mechanical property dataset of the carbon fiber composite plate and cable, the stress amplitude is analyzed by percentile filtering method to obtain the local damage law of the carbon fiber composite plate and cable.

[0040] On the other hand, the present invention provides a method for detecting carbon fiber composite plates and cables based on distributed optical fibers. This method is implemented by a carbon fiber composite plate and cable detection system based on distributed optical fibers, and includes:

[0041] S1, according to the carbon fiber composite cable, selecting a carbon fiber composite cable anchoring process, obtaining a carbon fiber composite cable anchoring scheme;

[0042] S2, according to the carbon fiber composite cable anchoring scheme, laying and fixing the optical fiber sensor module, obtaining a carbon fiber composite cable acquisition module;

[0043] S3, according to the carbon fiber composite cable acquisition module, acquiring strain data of the carbon fiber composite cable, obtaining a strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable;

[0044] S4, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable, performing data processing and calculation, obtaining a mechanical property data set of the carbon fiber composite cable;

[0045] S5, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable and the mechanical property data set of the carbon fiber composite cable, through analysis, obtaining the local damage law of the carbon fiber composite cable and displaying.

[0046] The technical scheme of the present application has at least the following beneficial effects compared with the prior art:

[0047] The above-mentioned scheme, on the one hand, solves the complex operation of pre-buried optical fiber sensor during the production stage of the cable, and the difficulty of repairing and replacing the optical fiber sensor, improves the laying efficiency of the optical fiber sensor, on the other hand, through the design of the laying form of different optical fiber sensor modules, realizes the full contact type strain accurate monitoring of the cable anchoring segment and the cable body segment of the carbon fiber composite cable, breaks through the technical difficulty that the strain information in the clamping type cable anchoring area cannot be measured, improves the installation efficiency and accuracy of the anchor, realizes the real-time dynamic strain monitoring during the whole service life of the carbon fiber composite cable, and thirdly, establishes a cable force calculation method for the carbon fiber composite cable, and predicts the local damage law of the carbon fiber composite cable. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0049] Figure 1 is a system block diagram of an embodiment of the carbon fiber composite cable detection system based on distributed optical fiber of the present application;

[0050] Figure 2 is a system schematic diagram of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0051] Figure 3 is a flowchart of an anchoring scheme of a cable anchoring module in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0052] Figure 4 is a layout flowchart of an optical fiber sensor module laid out in a cable body segment in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0053] Figure 5 is a flowchart of obtaining a carbon fiber composite cable anchoring module in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0054] Figure 6 is a flowchart of obtaining real-time strain data of a carbon fiber composite cable and local damage law and cable force information of the carbon fiber composite cable in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0055] Figure 7 is a schematic diagram of a groove processing scheme of a cable anchoring clamp in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0056] Figure 8 is a schematic diagram of a groove processing scheme of a cable anchoring segment plate in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0057] Figure 9 is a schematic diagram of a transition section of a groove processing scheme of a cable anchoring segment plate in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0058] Figure 10 is a schematic diagram of a transversely laid optical fiber sensor module in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0059] Figure 11 is a schematic diagram of a longitudinally laid optical fiber sensor module in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0060] Figure 12 is a structural schematic diagram of a glue pouring mold in a system of an embodiment of a distributed optical fiber-based carbon fiber composite cable detection system of the present application;

[0061] Figure 13is a schematic diagram of installing a cable anchor clamp in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0062] Figure 14 is a schematic diagram of carbon fiber composite cable detection in different service environments in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0063] Figure 15 is a global strain distribution diagram of the carbon fiber composite cable in the tensile environment in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0064] Figure 16 is a transverse strain distribution diagram of the carbon fiber composite cable anchoring segment in the tensile environment in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0065] Figure 17 is a local damage law diagram of the carbon fiber composite cable in the tensile environment in the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0066] Figure 18 is a global stress field change law diagram of the carbon fiber composite cable in the tensile environment in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application;

[0067] Figure 19 is a flowchart of the distributed optical fiber based carbon fiber composite cable detection method embodiment of the present application.

[0068] Figure label explanation: optical fiber sensor module 1, carbon fiber composite cable anchoring module 2, signal demodulation module 3, data processing and display module 4, carbon fiber composite cable 5, optical fiber sensing unit 11, optical fiber transmission unit 12. DETAILED DESCRIPTION

[0069] The technical solutions in the present application will be described below with reference to the drawings.

[0070] In the embodiments of the present application, the words such as "example", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0071] In order to make the technical problems, technical solutions and advantages of the present application more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0072] As Figure 1 the system block diagram of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application and as Figure 2 the system schematic diagram of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application, the present application provides a distributed optical fiber based carbon fiber composite cable detection system, which can realize a distributed optical fiber based carbon fiber composite cable detection method, and the system comprises: an optical fiber sensor module 1, a carbon fiber composite cable anchoring module 2, a signal demodulation module 3 and a data processing and display module 4.

[0073] The optical fiber sensor module 1 is used for distributed detection and transmission of strain information of the carbon fiber composite cable 5.

[0074] Specifically, the optical fiber sensor module 1 comprises:

[0075] The optical fiber sensing unit 11 is used for distributed detection of strain information of the carbon fiber composite cable 5.

[0076] Further, the carbon fiber composite cable 5 selects a carbon fiber composite plate with a width of 50mm, a thickness of 10mm and a length of 1500mm, which is a commonly used parameter of carbon fiber composite cable structure and meets the material selection standard of carbon fiber composite cable.

[0077] The optical fiber transmission unit 12 is used for transmission of the strain information detected by the optical fiber sensing unit 11.

[0078] The carbon fiber composite cable anchoring module 2 is used for fixing the carbon fiber composite cable 5 and the optical fiber sensor module 1.

[0079] Specifically, as Figure 3 the anchoring scheme flow chart of the carbon fiber composite cable anchoring module in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application, the anchoring process of the carbon fiber composite cable anchoring module 2 comprises:

[0080] According to the carbon fiber composite cable 5, a carbon fiber composite cable clamping type anchoring process is selected to obtain an anchoring scheme of the carbon fiber composite cable;

[0081] Further, the anchoring scheme of the carbon fiber composite cable comprises: a cable anchoring clamp grooving process scheme and a cable anchoring segment plate grooving process scheme, as Figure 7 the schematic diagram of the cable anchoring clamp grooving process scheme in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the present application and as Figure 8The schematic diagram of the groove processing scheme of the cable anchoring segment plate of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown in the figure;

[0082] Further, the cable anchoring clamp is designed as a semicircular groove, the opening width of the groove is 1mm, and the vertical depth is 0.5mm, which ensures that the glue can be evenly covered on the outer surface of the optical fiber;

[0083] The cable anchoring segment plate is designed as a U-shaped groove, the opening width of the groove is 1mm, the vertical depth of the U-shaped groove is 0.5mm, the bottom is a semicircle with a radius of 0.5mm, and the total depth of the groove is 1mm, which facilitates the placement of the optical fiber and avoids the occurrence of serious stress concentration of the carbon fiber composite cable caused by sharp angles

[0084] As shown in the figure, Figure 9 The schematic diagram of the transition section of the groove processing scheme of the cable anchoring segment plate of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown in the figure, the end of the groove in the groove processing scheme of the cable anchoring segment plate is provided with a transition section, the length of the transition section is 3.5mm, the transition section is inclined at an angle of 15° with the plate surface of the carbon fiber composite cable 5, and the connection interface is smooth to prevent the optical fiber of the anchoring segment and the cable body segment from being easily broken due to too large bending angle when connected in the transition section.

[0085] According to the carbon fiber composite cable anchoring scheme, the optical fiber sensor module 1 is arranged to obtain a carbon fiber composite cable with both ends not anchored;

[0086] Further, the arrangement form of the optical fiber sensor module 1 includes the optical fiber sensor module arranged in the cable anchoring segment and the optical fiber sensor module arranged in the cable body segment.

[0087] The optical fiber sensor module arranged in the cable anchoring segment includes a transversely arranged optical fiber sensor module and a longitudinally arranged optical fiber sensor module;

[0088] As shown in the figure, Figure 10 The schematic diagram of the transversely arranged optical fiber sensor module of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown in the figure, the transversely arranged optical fiber sensor module is arranged along a direction perpendicular to the length direction of the carbon fiber composite cable 5, different columns of the optical fiber sensor module 1 are sequentially connected, and then connected with the optical fiber sensor module 1 arranged in the cable body segment;

[0089] The slots of the horizontally arranged fiber optic sensor modules are all on the carbon fiber composite plate that extends into the cable anchoring section. There are a total of 5 horizontal slots, with a 45mm interval between the center lines of each slot. The first slot is 20mm from the end of the carbon fiber composite plate, and the last slot is 15mm from the end of the section that extends into the cable anchoring section. Each end of the carbon fiber composite cable extends 215mm.

[0090] like Figure 11 The diagram shown is a schematic of the longitudinally arranged fiber optic sensor module in the system of the carbon fiber composite plate and cable detection system based on distributed optical fiber of the present invention. The longitudinally arranged fiber optic sensor module 1 is arranged in a direction parallel to the length direction of the carbon fiber composite plate and cable 5. The fiber optic sensor modules 1 in different rows are first bent and connected in sequence, and then connected to the fiber optic sensor modules 1 arranged in the plate and cable body segment.

[0091] The U-shaped grooves of the longitudinally arranged fiber optic sensor modules are all on the carbon fiber composite material extending into the cable anchoring section. There are a total of 3 longitudinal grooves, with a spacing of 12.5 mm between the center lines of each groove. They are evenly distributed in the width direction of the carbon fiber composite cable 5, and the length of the longitudinal groove is 215 mm.

[0092] like Figure 4 The flowchart shown is a layout flowchart of the fiber optic sensor module deployed in the cable body segment of the carbon fiber composite plate and cable detection system based on distributed optical fiber according to an embodiment of the present invention. The deployment process of the fiber optic sensor module deployed in the cable body segment includes:

[0093] The surface of the cable section is wiped clean and the fiber optic sensor module 1 is positioned to obtain the cable section to be laid with optical fiber.

[0094] Based on the cable segment of the optical fiber to be laid, the fiber sensor module is aligned with the glue-filling mold to obtain the cable segment for fixing the optical fiber sensor.

[0095] Furthermore, such as Figure 12 The diagram shown is a schematic representation of the glue-pouring mold in an embodiment of the distributed optical fiber-based carbon fiber composite plate and cable detection system of the present invention. The mold is made of transparent silicone material and has a trapezoidal cross-section with an upper base of 2mm, a lower base of 4mm, and a height of 1.3mm. A semi-circular hole with a diameter of 1mm is located in the center of the bottom for placing the optical fiber sensing unit 11 and controlling the shape of the glue. A layer of petroleum jelly is coated on the inner surface of the mold to prevent adhesion to the epoxy resin material, which could affect the glue-pouring quality, glue molding, and demolding process.

[0096] Based on the cable segment of the fixed fiber optic sensor, the epoxy resin is filled into the potting mold and allowed to solidify naturally. After the potting mold is removed, the fiber optic sensor module with the cable segment is obtained.

[0097] Based on the unanchored carbon fiber composite plate at both ends, parallel plate cable anchoring clamps are installed at both ends to obtain carbon fiber composite plate cable anchoring module 2.

[0098] Furthermore, such as Figure 5 The flowchart shown in the embodiment of the carbon fiber composite plate and cable detection system based on distributed optical fiber of the present invention illustrates the process of obtaining the carbon fiber composite plate and cable anchoring module. Based on the unanchored carbon fiber composite plate at both ends, parallel plate and cable anchoring clamps are installed at both ends to obtain the carbon fiber composite plate and cable anchoring module 2, which includes:

[0099] Based on the unanchored carbon fiber composite plate at both ends, the signal demodulation module and the data processing and display module are connected to obtain the plate cable anchoring clamp installation detection device.

[0100] According to the plate cable anchorage clamp installation detection device, the plate cable anchorage clamp is installed and the strain data of the carbon fiber composite plate cable 5 is detected in real time to obtain the strain data set during the installation of the plate cable anchorage clamp.

[0101] Furthermore, such as Figure 13 The diagram shown is a schematic of the installation of the plate cable anchoring clamp in the system of the carbon fiber composite plate cable detection system based on distributed optical fiber of the present invention. The lower anchor seat, the lower anchor fixing device, the upper anchor seat and the upper anchor fixing device are installed in sequence. The signal demodulation module 3 and the data processing and display module 4 are turned on to detect the strain of the plate cable anchoring section throughout the installation process and to strictly detect the uneven stress distribution inside the anchoring clamp during the installation process.

[0102] Based on the strain dataset during the installation of the cable-stayed anchoring fixture, the installation scheme of the anchoring fixture is adjusted to ensure that the carbon fiber composite cable-stayed anchoring module 2 is obtained by making the carbon fiber composite cable-stayed anchoring module 2 uniformly stressed and symmetrically stressed along the axis of the carbon fiber composite cable-stayed anchoring fixture.

[0103] Signal demodulation module 3 is used to demodulate the strain information of the fiber optic sensor module 1;

[0104] The data processing and display module 4 is used to obtain and display the real-time strain data of the carbon fiber composite cable 5, the local damage pattern and cable force information of the carbon fiber composite cable 5 based on the demodulation data of the signal demodulation module 3.

[0105] Specifically, such as Figure 6 The flowchart shown in the embodiment of the distributed optical fiber-based carbon fiber composite plate and cable detection system of the present invention illustrates the process of obtaining real-time strain data, local damage patterns, and cable force information of the carbon fiber composite plate and cable. Figure 14The schematic diagram of the carbon fiber composite cable detection in different service environments of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown. According to the demodulation data of the signal demodulation module 3, the mechanical property data set of the carbon fiber composite cable 5 and the local damage law of the carbon fiber composite cable 5 are obtained, including:

[0106] According to the demodulation data of the signal demodulation module 3, the strain distribution data set of the optical fiber sensor at different cross-section positions of the carbon fiber composite cable 5 is obtained;

[0107] Further, the tensile environment is selected to obtain the global strain distribution diagram of the carbon fiber composite cable in the tensile environment of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application as shown in Figure 15 The schematic diagram of the carbon fiber composite cable detection in different service environments of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown. According to the demodulation data of the signal demodulation module 3, the mechanical property data set of the carbon fiber composite cable 5 and the local damage law of the carbon fiber composite cable 5 are obtained, including: Figure 16 The schematic diagram of the carbon fiber composite cable detection in different service environments of the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown. According to the demodulation data of the signal demodulation module 3, the mechanical property data set of the carbon fiber composite cable 5 and the local damage law of the carbon fiber composite cable 5 are obtained, including:

[0108] According to the strain distribution data set of the optical fiber sensor at different cross-section positions of the carbon fiber composite cable 5, the total stress distribution data set of the carbon fiber composite cable 5 is obtained through formula (1),

[0109]

[0110] In the formula, T is the total average stress of the carbon fiber composite cable, is the average strain of the i-th optical fiber sensor at different cross-section positions of the carbon fiber composite cable in the full length range of the cable body segment, n is the number of optical fiber sensor modules, and E is the Young's modulus of the carbon fiber composite cable;

[0111] According to the total stress distribution data set of the carbon fiber composite cable 5, the mechanical property data set of the carbon fiber composite cable 5 is obtained through formula (2),

[0112]

[0113] In the formula, T is the total average stress of the carbon fiber composite cable,

[0114] According to the strain distribution data set of the optical fiber sensor at different cross-section positions of the carbon fiber composite cable 5 and the mechanical property data set of the carbon fiber composite cable, the stress amplitude is analyzed by the percentile filtering method to obtain the local damage law of the carbon fiber composite cable 5, as shown in Figure 17 The local damage law diagram of the carbon fiber composite cable in the tensile environment of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown.

[0115] ​Further, by analyzing, the local damage law of the carbon fiber composite cable is obtained as shown in Figure 18 The figure of the global stress field variation law of the carbon fiber composite cable under tension in the system of the distributed optical fiber based carbon fiber composite cable detection system embodiment of the application is shown in the figure.

[0116] The flow chart of the distributed optical fiber based carbon fiber composite cable detection method embodiment of the application is shown in the figure. Figure 19 The application provides a distributed optical fiber based carbon fiber composite cable detection method, which is realized by a distributed optical fiber based carbon fiber composite cable detection system, and the method comprises the following steps:

[0117] S1, according to the carbon fiber composite cable, a carbon fiber composite cable anchoring process is selected to obtain an anchoring scheme of the carbon fiber composite cable;

[0118] S2, according to the anchoring scheme of the carbon fiber composite cable, the optical fiber sensor module is laid and fixed to obtain a carbon fiber composite cable acquisition module;

[0119] S3, according to the carbon fiber composite cable acquisition module, strain data of the carbon fiber composite cable are acquired to obtain a strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable;

[0120] S4, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable, data processing and calculation are performed to obtain a mechanical property data set of the carbon fiber composite cable;

[0121] S5, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite cable and the mechanical property data set of the carbon fiber composite cable, by analyzing, the local damage law of the carbon fiber composite cable is obtained and displayed.

[0122] The application provides a distributed optical fiber based carbon fiber composite cable detection system and method, which solves the complex operation of pre-buried optical fiber sensors in the production stage of the cable, the repair and replacement of the optical fiber sensors, and other problems, improves the laying efficiency of the optical fiber sensors, and realizes the global contact type strain accurate monitoring of the cable anchoring segment and the cable body segment of the carbon fiber composite cable by designing different laying modes of the optical fiber sensor module, breaks through the technical difficulty that the strain information in the clamping type cable anchoring area cannot be measured, improves the installation efficiency and accuracy of the anchor, realizes the real-time dynamic strain monitoring in the whole service life of the carbon fiber composite cable, and finally establishes a cable force calculation method of the carbon fiber composite cable and predicts the local damage law of the carbon fiber composite cable.

[0123] It is to be understood that the present application is described by way of example only, and that modifications of detail can be made without departing from the scope of the application. Various modifications and changes can be made thereto by those skilled in the art which freely substitute various features and embodiments thereof, without departing from the spirit of the application. Further, it is the intent that modifications be made in the specific examples to adapt them to particular situations and materials without departing from the spirit of the application. Therefore, the application is not limited by the specific examples described herein, but only by the scope of the appended claims, and their equivalents.

Claims

1. A distributed fiber optic based carbon fiber composite strand cable detection system, comprising: The system comprises: a fiber sensor module for distributed detection and transmission of strain information of the carbon fiber composite cable; a carbon fiber composite cable anchoring module for fixing the carbon fiber composite cable and the fiber sensor module; a signal demodulation module for demodulating the strain information of the fiber sensor module; a data processing and display module for obtaining real-time strain data of the carbon fiber composite cable and local damage law and cable force information of the carbon fiber composite cable according to the demodulation data of the signal demodulation module and displaying the data; the anchoring process of the carbon fiber composite cable anchoring module comprises: selecting a carbon fiber composite cable clamping type anchoring process according to the carbon fiber composite cable to obtain an anchoring scheme of the carbon fiber composite cable; arranging the fiber sensor module according to the anchoring scheme of the carbon fiber composite cable to obtain a carbon fiber composite cable with both ends unanchored; respectively installing parallel cable anchoring clamps at both ends according to the carbon fiber composite cable with both ends unanchored to obtain the carbon fiber composite cable anchoring module; the arrangement mode of the fiber sensor module comprises: fiber sensor modules arranged in the cable anchoring segment and fiber sensor modules arranged in the cable body segment; obtaining real-time strain data of the carbon fiber composite cable and local damage law and stress information of the carbon fiber composite cable according to the demodulation data of the signal demodulation module comprises: obtaining strain distribution data sets of fiber sensors at different cross-sectional positions of the carbon fiber composite cable according to the demodulation data of the signal demodulation module; obtaining total stress distribution data sets of the carbon fiber composite cable through formula (1) according to the strain distribution data sets obtained by the fiber sensors at different cross-sectional positions of the carbon fiber composite cable, In the formula: is the total average stress of the carbon fiber composite cable, is the average strain of the i-th fiber sensor in the cross section of the carbon fiber composite cable in the full length range of the cable body section, n is the number of fiber sensor modules, and E is the Young's modulus of the carbon fiber composite cable. obtaining mechanical property data sets of the carbon fiber composite cable through formula (2) according to the total stress distribution data sets of the carbon fiber composite cable, wherein T is the cable force of the carbon fiber composite cable and A is the cross-sectional area of the carbon fiber composite cable; obtaining local damage law of the carbon fiber composite cable by analyzing stress amplitude through the percentile filtering method according to the strain distribution data sets of the fiber sensors at different cross-sectional positions of the carbon fiber composite cable and the mechanical property data sets of the carbon fiber composite cable.

2. The distributed fiber based carbon fiber composite strand detection system of claim 1, wherein, The fiber sensor module comprises: a fiber sensing unit for distributed detection of strain information of the carbon fiber composite cable; a fiber transmission unit for transmission of the strain information detected by the fiber sensing unit.

3. The distributed fiber based carbon fiber composite strand detection system of claim 1, wherein, The anchoring scheme of the carbon fiber composite cable comprises: a cable anchoring clamp grooving process scheme and a cable anchoring segment plate grooving process scheme; the end of the groove in the cable anchoring segment plate grooving process scheme is provided with a transition section.

4. The distributed optical fiber based carbon fiber composite strand detection system of claim 1, wherein, The fiber sensor modules arranged in the cable anchoring segment comprise: fiber sensor modules arranged transversely and fiber sensor modules arranged longitudinally; the fiber sensor modules arranged transversely are arranged along a direction perpendicular to the length direction of the carbon fiber composite cable, and different columns of the fiber sensor modules are sequentially connected by bending and then connected with the fiber sensor modules arranged in the cable body segment. The longitudinal arrangement of the optical fiber sensor module is arranged along the direction parallel to the length direction of the carbon fiber composite plate cable, and different rows of the optical fiber sensor module are sequentially connected by bending and then connected with the optical fiber sensor module arranged on the plate cable body segment.

5. The distributed optical fiber-based carbon fiber composite strand detection system of claim 1, wherein, The arrangement process of the optical fiber sensor module arranged on the plate cable body segment includes: The surface of the plate cable body segment is wiped clean and the optical fiber sensor module is positioned to obtain a cable body segment to be laid with optical fibers; According to the cable body segment to be laid with optical fibers, the optical fiber sensor module is aligned and laid using a glue pouring mold to obtain a cable body segment with fixed optical fiber sensors; According to the cable body segment with fixed optical fiber sensors, the epoxy resin glue is poured into the glue pouring mold, the epoxy resin glue is naturally solidified, and the glue pouring mold is disassembled to obtain the optical fiber sensor module arranged on the plate cable body segment.

6. The distributed optical fiber-based carbon fiber composite strand detection system of claim 1, wherein, According to the two-end unanchored carbon fiber composite plate, two parallel plate cable anchoring clamps at both ends are installed to obtain a carbon fiber composite plate cable anchoring module, including: According to the two-end unanchored carbon fiber composite plate, the signal demodulation module and the data processing and display module are connected to obtain a plate cable anchoring clamp installation detection device; According to the plate cable anchoring clamp installation detection device, the plate cable anchoring clamp is installed and the strain data of the carbon fiber composite plate cable is detected in real time to obtain a strain data set when the plate cable anchoring clamp is installed; According to the strain data set when the plate cable anchoring clamp is installed, the anchoring clamp installation scheme is adjusted so that the carbon fiber composite plate cable in the anchoring clamp is uniformly stressed and symmetrically stressed along the axis of the carbon fiber composite plate cable to obtain the carbon fiber composite plate cable anchoring module.

7. A distributed fiber based carbon fiber composite cable detection method, the distributed fiber based carbon fiber composite cable detection method being implemented by the distributed fiber based carbon fiber composite cable detection system of any one of claims 1-6, wherein, The method includes: S1, according to the carbon fiber composite plate cable, selecting a carbon fiber composite plate cable anchoring process to obtain an anchoring scheme of the carbon fiber composite plate cable; S2, according to the carbon fiber composite plate cable anchoring scheme, arranging and fixing the optical fiber sensor module to obtain a carbon fiber composite plate cable acquisition module; S3, according to the carbon fiber composite plate cable acquisition module, acquiring strain data of the carbon fiber composite plate cable to obtain a strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite plate cable; S4, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite plate cable, performing data processing and calculation to obtain a mechanical property data set of the carbon fiber composite plate cable; S5, according to the strain distribution data set of the optical fiber sensor at different cross-sectional positions of the carbon fiber composite plate cable and the mechanical property data set of the carbon fiber composite plate cable, analyzing to obtain a local damage law of the carbon fiber composite plate cable and displaying.

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