CN120488987A - Carbon fiber composite material plate cable detection system and method based on distributed optical fibers - Google Patents
Carbon fiber composite material plate cable detection system and method based on distributed optical fibersInfo
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- CN120488987A CN120488987A CN202510732365.1A CN202510732365A CN120488987A CN 120488987 A CN120488987 A CN 120488987A CN 202510732365 A CN202510732365 A CN 202510732365A CN 120488987 A CN120488987 A CN 120488987A
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Abstract
本发明提供一种基于分布式光纤的碳纤维复材板索检测系统及方法，涉及结构工程损伤检测领域。该发明通过在碳纤维复材板索的表面和碳纤维复材板索锚固模块布设分布式光纤传感器模块，解决了板索生产阶段预埋光纤传感器的复杂操作和光纤传感器修复及更换光纤难等问题，提高了光纤传感器的布设效率，另外通过设计不同光纤传感器模块的布设形态，实现了碳纤维复材板索的板索锚固段和板索索体段的全域接触式应变精准监测，突破了夹持式板索锚固区应变信息不可测的技术难题，提高了锚具安装效率和精度，实现了碳纤维复材板索服役全寿命过程中的实时动态应变监测，最后，建立了碳纤维复材板索索力计算方法，预测了碳纤维复材板索的局部损伤规律。
The present invention provides a carbon fiber composite cable detection system and method based on distributed optical fibers, relating to the field of structural engineering damage detection. By deploying distributed optical fiber sensor modules on the surface of the carbon fiber composite cable and on the anchoring modules of the cable, the invention solves the problems of the complex operation of pre-embedded optical fiber sensors during the cable production phase and the difficulty in repairing and replacing optical fibers. This improves the deployment efficiency of the optical fiber sensors. Furthermore, by designing the deployment configurations of different optical fiber sensor modules, it achieves precise contact strain monitoring of the cable anchoring section and cable body section of the carbon fiber composite cable. This overcomes the technical difficulty of unmeasurable strain information in the clamped cable anchoring zone, improves the efficiency and accuracy of anchor installation, and enables real-time dynamic strain monitoring of the carbon fiber composite cable throughout its service life. Finally, a method for calculating the cable force of the carbon fiber composite cable is established, predicting the local damage patterns of the carbon fiber composite cable.
Description
Technical Field
The invention relates to the field of structural engineering damage detection, in particular to a carbon fiber composite plate cable detection system and method based on distributed optical fibers.
Background
As a representative high-performance engineering material which is rapidly developed in recent years, a carbon fiber reinforced composite material (Carbon Fiber Reinforced Polymer, CFRP) has a structure reinforcing theory, a design method and a construction technology which tend to be mature and widely applied, and a novel structure theory and method have important progress and show wide application prospects. For a large-span bridge structure, the strength of the carbon fiber composite material inhaul cable is 30% -50% higher than that of a steel cable, and the weight is only about 1/5 of that of the steel, so that the ultra-low dead weight effect is realized. Therefore, in recent years, the carbon fiber composite material inhaul cable has the advantages of light weight, high strength, corrosion resistance, fatigue resistance, small temperature deformation and the like, and is continuously developed in research and practice, and the structure reinforcement theory, the design method and the construction technology tend to be mature and widely applied.
However, with the continuous increase of service life, problems such as corrosion damage, cable breakage and the like are increasingly prominent, and the safety and durability of the inhaul cable are seriously affected. And the anchoring system is usually kept in a sealing state in a service state, and the traditional detection method is mostly dependent on a local sensor, so that the strain distribution of the plate cable under complex load is difficult to comprehensively capture. The magnetic flux leakage detection method in the prior art has the advantages of accurate positioning, high detection precision and the like, but can only realize the detection of a sensor coverage area, can not realize the plate rope detection of an anchoring area, is only suitable for steel plate ropes (such as parallel steel wire ropes) and is not suitable for CFRP plate ropes, the ultrasonic guided wave technology in the prior art can realize the full structure and long-distance detection of the plate ropes, and meanwhile, the defect detection signal has higher identification, but the report of plate rope defect detection by utilizing ultrasonic guided waves is not much at present, mainly because the plate rope fluctuation characteristic analysis theory is not perfect and the development of a special sensor is difficult, and the research on the ultrasonic detection technology of the CFRP plate ropes and anchorage thereof is deficient.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a carbon fiber composite plate cable detection system and a method based on distributed optical fibers, which solve the problems of complex operation of pre-buried optical fiber sensors and difficult restoration and replacement of optical fibers of the optical fiber sensors in the plate cable production stage and the like by arranging distributed optical fiber sensor modules on the surface of the carbon fiber composite plate cable and a carbon fiber composite plate cable anchoring module, improve the arrangement efficiency of the optical fiber sensors, in addition, through designing the layout forms of different optical fiber sensor modules, the whole domain contact type strain accurate monitoring of the plate cable anchoring section and the plate cable body section of the carbon fiber composite plate cable is realized, the technical problem that strain information of a clamping type plate cable anchoring area is not measurable is broken through, the anchor mounting efficiency and the anchor mounting precision are improved, the real-time dynamic strain monitoring in the service life process of the carbon fiber composite plate cable is realized, and finally, a carbon fiber composite plate cable force calculation method is established, and the local damage rule of the carbon fiber composite plate cable is predicted. In order to achieve the above purpose, the technical scheme is as follows:
In one aspect, the present invention provides a carbon fiber composite rope detection system based on a distributed optical fiber, the system comprising:
The optical fiber sensor module is used for detecting and transmitting strain information of the carbon fiber composite plate rope in a distributed mode;
the carbon fiber composite plate rope anchoring module is used for fixing the carbon fiber composite plate rope and the optical fiber sensor module;
The signal demodulation module is used for demodulating the strain information of the optical fiber sensor module;
And the data processing and displaying module is used for obtaining and displaying real-time strain data of the carbon fiber composite sheet rope and local damage rule and rope force information of the carbon fiber composite sheet rope according to the demodulation data of the signal demodulation module.
Optionally, the fiber optic sensor module includes:
The optical fiber sensing unit is used for detecting strain information of the carbon fiber composite plate rope in a distributed mode;
and the optical fiber transmission unit is used for transmitting the strain information detected by the optical fiber sensing unit.
Optionally, the anchoring process of the carbon fiber composite plate cable anchoring module comprises the following steps:
according to the carbon fiber composite plate rope, selecting a carbon fiber composite plate rope clamping type anchoring process to obtain an anchoring scheme of the carbon fiber composite plate rope;
According to the carbon fiber composite plate cable anchoring scheme, arranging the optical fiber sensor module to obtain a carbon fiber composite plate with two unanchored ends;
And respectively installing parallel plate cable anchoring clamps at two ends according to the carbon fiber composite plates with two unanchored ends to obtain the carbon fiber composite plate cable anchoring module.
Optionally, the anchoring scheme of the carbon fiber composite plate cable comprises a plate cable anchoring clamp grooving process scheme and a plate cable anchoring section plate grooving process scheme;
The tail end of the groove in the plate rope anchoring section plate grooving process scheme is provided with a transition section.
Optionally, the layout form of the optical fiber sensor module comprises an optical fiber sensor module laid on the plate cable anchoring section and an optical fiber sensor module laid on the plate cable body section.
Optionally, the optical fiber sensor module arranged on the plate cable anchoring section comprises an optical fiber sensor module arranged transversely and an optical fiber sensor module arranged longitudinally;
the transversely arranged optical fiber sensor modules are arranged along the direction perpendicular to the length direction of the carbon fiber composite material plate cable, the optical fiber sensor modules in different rows are sequentially bent and connected, and then the optical fiber sensor modules are connected with the optical fiber sensor modules arranged on the plate cable body section;
The longitudinally arranged optical fiber sensor modules are arranged along the direction parallel to the length direction of the carbon fiber composite material plate cable, and the optical fiber sensor modules in different rows are firstly sequentially bent and connected and then are connected with the optical fiber sensor modules arranged on the plate cable body section.
Optionally, the layout process of the optical fiber sensor module laid by the plate cable body section comprises the following steps:
wiping the surface of the plate cable body section clean and positioning the optical fiber sensor module to obtain the cable body section of the optical fiber to be paved;
according to the cable section of the optical fiber to be paved, using a glue filling mould to align the paved optical fiber sensor module, and obtaining a cable section for fixing the optical fiber sensor;
And filling epoxy resin glue into the glue filling mould according to the cable body section for fixing the optical fiber sensor, and naturally solidifying the epoxy resin glue and disassembling the glue filling mould to obtain the optical fiber sensor module arranged on the cable body section of the plate cable.
Optionally, according to the carbon fiber composite board with two unanchored ends, parallel plate cable anchoring clamps at two ends are respectively installed to obtain a carbon fiber composite board cable anchoring module, which comprises:
According to the carbon fiber composite board with the two ends not anchored, connecting the signal demodulation module with the data processing and display module to obtain a board cable anchoring clamp installation detection device;
According to the plate cable anchoring clamp installation detection device, the plate cable anchoring clamp is installed, strain data of the carbon fiber composite plate cable are detected in real time, and a strain data set during installation of the plate cable anchoring clamp is obtained;
according to the strain data set when the plate cable anchoring clamp is installed, the installation scheme of the anchoring clamp 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, and the carbon fiber composite plate cable anchoring module is obtained.
Optionally, the obtaining the mechanical property data set of the carbon fiber composite plate cable and the local damage rule of the carbon fiber composite plate cable according to the demodulation data of the signal demodulation module includes:
According to the demodulation data of the signal demodulation module, strain distribution data sets obtained by optical fiber sensors at different cross section positions of the carbon fiber composite plate cable are obtained;
Obtaining a total stress distribution data set of the carbon fiber composite plate cable through a formula (1) according to the strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate cable,
Wherein: is the total average stress of the carbon fiber composite plate rope, The method is characterized in that the average strain of an ith optical fiber sensor in the full length range of a plate cable body section at different cross section positions of the carbon fiber composite plate cable is represented by n, the number of optical fiber sensor modules is represented by E, and the Young modulus of the carbon fiber composite plate cable is represented by E;
obtaining a mechanical property data set of the carbon fiber composite plate cable through a formula (2) according to the total stress distribution data set of the carbon fiber composite plate cable,
Wherein T is the cable force of the carbon fiber composite material cable, A is the cross-sectional area of the carbon fiber composite material cable;
and analyzing stress amplitude values through a percentile filtering method according to strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope and mechanical property data sets of the carbon fiber composite plate rope to obtain a local damage rule of the carbon fiber composite plate rope.
On the other hand, the invention provides a carbon fiber composite rope detection method based on distributed optical fibers, which is realized by a carbon fiber composite rope detection system based on the distributed optical fibers, and comprises the following steps:
s1, selecting a carbon fiber composite plate rope anchoring process according to a carbon fiber composite plate rope to obtain an anchoring scheme of the carbon fiber composite plate rope;
s2, according to the carbon fiber composite material plate rope anchoring scheme, arranging the optical fiber sensor module and fixing to obtain a carbon fiber composite material plate rope acquisition module;
s3, according to the carbon fiber composite plate rope acquisition module, acquiring strain data of the carbon fiber composite plate rope to obtain strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope;
s4, carrying out data processing and calculation according to strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite material plate cable to obtain a mechanical property data set of the carbon fiber composite material plate cable;
S5, according to the strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope and the mechanical property data sets of the carbon fiber composite plate rope, the local damage rule of the carbon fiber composite plate rope is obtained through analysis and displayed.
Compared with the prior art, the technical scheme of the invention has at least the following beneficial effects:
According to the technical scheme, on one hand, the distributed optical fiber sensor modules are arranged on the surface of the carbon fiber composite plate cable and the carbon fiber composite plate cable anchoring module, so that the problems of complex operation of pre-buried optical fiber sensors and difficult restoration and replacement of optical fibers of the optical fiber sensors in the plate cable production stage are solved, the arrangement efficiency of the optical fiber sensors is improved, on the other hand, by designing the arrangement forms of different optical fiber sensor modules, the global contact type strain accurate monitoring of the plate cable anchoring section and the plate cable body section of the carbon fiber composite plate cable is realized, the technical problem that strain information of the clamping type plate cable anchoring area is not measurable is broken through, the anchor installation efficiency and precision are improved, the real-time dynamic strain monitoring in the whole service life process of the carbon fiber composite plate cable is realized, and on the other hand, the calculation method of the carbon fiber composite plate cable force is established, and the local damage rule of the carbon fiber composite plate cable is predicted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system block diagram of an embodiment of a distributed fiber based carbon fiber composite rope detection system of the present invention;
FIG. 2 is a system schematic diagram of an embodiment of a distributed fiber based carbon fiber composite rope detection system of the present invention;
FIG. 3 is a flow chart of an anchoring scheme of a carbon fiber composite rope anchoring module in a system of an embodiment of a distributed fiber-based carbon fiber composite rope detection system of the present invention;
FIG. 4 is a flow chart of the layout of fiber optic sensor modules for the layout of cable body segments in a system of an embodiment of a distributed fiber based carbon fiber composite cable detection system of the present invention;
FIG. 5 is a flow chart of obtaining a carbon fiber composite rope anchoring module in a system of an embodiment of a distributed fiber-based carbon fiber composite rope detection system of the present invention;
FIG. 6 is a flow chart of obtaining real-time strain data of a carbon fiber composite rope and local damage rules and rope force information of the carbon fiber composite rope in a system of an embodiment of a distributed optical fiber-based carbon fiber composite rope detection system of the present invention;
FIG. 7 is a schematic diagram of a cable anchor clamp grooving process scheme in a system of an embodiment of a distributed fiber based carbon fiber composite cable detection system of the present invention;
FIG. 8 is a schematic diagram of a cable anchor section plate grooving process scheme in a system of an embodiment of a distributed fiber based carbon fiber composite cable detection system of the present invention;
FIG. 9 is a schematic diagram of a cable anchor plate grooving process scheme transition section in a system of an embodiment of a distributed fiber based carbon fiber composite cable detection system of the present invention;
FIG. 10 is a schematic diagram of a laterally deployed fiber optic sensor module in a system of an embodiment of a distributed fiber optic based carbon fiber composite plate and cable detection system of the present invention;
FIG. 11 is a schematic diagram of a longitudinally routed fiber optic sensor module in a system of an embodiment of a distributed fiber optic based carbon fiber composite rope detection system of the present invention;
FIG. 12 is a schematic diagram of a glue-pouring die in a system of an embodiment of a distributed fiber based carbon fiber composite rope detection system of the present invention;
FIG. 13 is a schematic illustration of a mounting plate cable anchor fixture in a system of an embodiment of a distributed fiber based carbon fiber composite plate cable detection system of the present invention;
FIG. 14 is a schematic diagram of carbon fiber composite rope detection under different service environments in a system of an embodiment of a distributed fiber based carbon fiber composite rope detection system of the present invention;
FIG. 15 is a graph of global strain distribution of a carbon fiber composite rope under tensile conditions in a system of an embodiment of a distributed fiber-based carbon fiber composite rope detection system of the present invention;
FIG. 16 is a graph of the transverse strain profile of the carbon fiber composite rope anchoring section in a tensile environment in a system of an embodiment of the distributed fiber based carbon fiber composite rope detection system of the present invention;
FIG. 17 is a graph of a local damage rule of a carbon fiber composite rope under a tensile environment in an embodiment of a distributed fiber-based carbon fiber composite rope detection system of the present invention;
FIG. 18 is a graph of global stress field variation of a carbon fiber composite rope under a tensile environment in a system of an embodiment of a distributed fiber-based carbon fiber composite rope detection system of the present invention;
fig. 19 is a flow chart of an embodiment of a distributed fiber based carbon fiber composite sheet rope detection method of the present invention.
The reference numerals in the figure indicate that the optical fiber sensor module 1, the carbon fiber composite plate cable anchoring module 2, the signal demodulation module 3, the data processing and displaying module 4, the carbon fiber composite plate cable 5, the optical fiber sensing unit 11 and the optical fiber transmission unit 12.
Detailed Description
The technical scheme of the invention is described below with reference to the accompanying drawings.
In embodiments of the invention, words such as "exemplary," "such as" and the like are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term use of an example is intended to present concepts in a concrete fashion. Furthermore, in embodiments of the present invention, the meaning of "and/or" may be that of both, or may be that of either, optionally one of both.
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The invention provides a distributed optical fiber based carbon fiber composite rope detection system, which is shown in a system block diagram of an embodiment of the distributed optical fiber based carbon fiber composite rope detection system shown in fig. 1 and a system schematic diagram of an embodiment of the distributed optical fiber based carbon fiber composite rope detection system shown in fig. 2, and can realize a distributed optical fiber based carbon fiber composite rope detection method, wherein the system comprises an optical fiber sensor module 1, a carbon fiber composite rope anchoring module 2, a signal demodulation module 3 and a data processing and display module 4;
The optical fiber sensor module 1 is used for detecting and transmitting strain information of the carbon fiber composite plate rope 5 in a distributed manner;
specifically, the optical fiber sensor module 1 includes:
the optical fiber sensing unit 11 is used for detecting strain information of the carbon fiber composite plate rope 5 in a distributed manner;
further, the carbon fiber composite plate rope 5 is a carbon fiber composite plate with the width of 50mm, the thickness of 10mm and the length of 1500mm, and the dimension is a common parameter of a carbon fiber composite plate rope structure and accords with the carbon fiber composite plate rope selection standard.
And an optical fiber transmission unit 12 for transmitting the strain information detected by the optical fiber sensing unit 11.
The carbon fiber composite plate rope anchoring module 2 is used for fixing the carbon fiber composite plate rope 5 and the optical fiber sensor module 1;
specifically, as shown in fig. 3, an anchoring scheme flow chart of a carbon fiber composite plate rope anchoring module in a system of an embodiment of the carbon fiber composite plate rope detection system based on the distributed optical fibers of the invention, an anchoring process of the carbon fiber composite plate rope anchoring module 2 comprises the following steps:
According to the carbon fiber composite plate rope 5, selecting a carbon fiber composite plate rope clamping type anchoring process to obtain an anchoring scheme of the carbon fiber composite plate rope;
Further, the anchoring scheme of the carbon fiber composite plate rope comprises a plate rope anchoring clamp grooving process scheme and a plate rope anchoring section plate grooving process scheme, wherein the schematic diagram of the plate rope anchoring clamp grooving process scheme in the system of the carbon fiber composite plate rope detection system embodiment based on the distributed optical fiber is shown in fig. 7, and the schematic diagram of the plate rope anchoring section plate grooving process scheme in the system of the carbon fiber composite plate rope detection system embodiment based on the distributed optical fiber is shown in fig. 8;
Furthermore, the plate cable anchoring clamp is designed into a semicircular notch, the width of an opening of the notch is 1mm, the vertical depth is 0.5mm, and the design ensures that the colloid can be uniformly thick and cover the outer surface of the optical fiber;
the plate of the plate cable anchoring section is designed into a U-shaped notch, the width of an opening of the notch is 1mm, the vertical depth of the U-shaped notch is 0.5mm, the bottom of the U-shaped notch is semicircular with the radius of 0.5mm, the total depth of the notch is 1mm, the plate cable anchoring section is convenient for placing an optical fiber, and meanwhile, the phenomenon of serious stress concentration on a carbon fiber composite plate cable caused by sharp angles is avoided
The schematic diagram of a transition section of a plate grooving process scheme of a plate rope anchoring section in a system based on a carbon fiber composite plate rope detection system embodiment of the invention shown in fig. 9, wherein the tail end of a groove in the plate rope anchoring section plate grooving process scheme is provided with a transition section, the length of the transition section is 3.5mm, the transition section and the plate surface of the carbon fiber composite plate rope 5 form a 15-degree inclined angle, and a joint is smooth, so that the optical fibers of an anchoring section and a rope body section are prevented from being broken easily due to overlarge bending angle when the transition sections are connected.
According to the carbon fiber composite plate cable anchoring scheme, arranging the optical fiber sensor module 1 to obtain a carbon fiber composite plate with two unanchored ends;
further, the layout form of the optical fiber sensor module 1 comprises an optical fiber sensor module laid on the plate cable anchoring section and an optical fiber sensor module laid on the plate cable body section.
The optical fiber sensor module arranged on the plate cable anchoring section comprises an optical fiber sensor module arranged transversely and an optical fiber sensor module arranged longitudinally;
The schematic diagram of a fiber sensor module transversely arranged in a system based on an embodiment of a distributed fiber-based carbon fiber composite plate cable detection system of the present invention as shown in fig. 10, wherein the fiber sensor module transversely arranged is that the fiber sensor module is arranged along a direction perpendicular to a length direction of the carbon fiber composite plate cable 5, and the fiber sensor modules 1 of different columns are sequentially bent and connected first and then are connected with the fiber sensor modules 1 arranged on the plate cable body section;
The grooves of the optical fiber sensor modules which are transversely distributed are all arranged on the carbon fiber composite plate which extends into the plate cable anchoring section, 5 channels of transverse grooves are formed, the interval between the central lines of the grooves is 45mm, the distance between the first channel of grooves and the end of the carbon fiber composite plate is 20mm, the distance between the last channel of grooves extends into the tail end of the plate cable anchoring section by 15mm, and each end of the carbon fiber composite plate cable extends into 215mm.
The schematic diagram of the optical fiber sensor module longitudinally arranged in the system based on the distributed optical fiber carbon fiber composite material plate cable detection system embodiment of the invention shown in fig. 11 is that the optical fiber sensor module 1 is arranged along the direction parallel to the length direction of the carbon fiber composite material plate cable 5, and the optical fiber sensor modules 1 of different rows are sequentially bent and connected first and then are connected with the optical fiber sensor module 1 arranged on the plate cable body section.
The U-shaped notch grooves of the optical fiber sensor modules which are longitudinally distributed are all formed in the carbon fiber composite material which extends into the plate cable anchoring section, the total number of the longitudinal grooves is 3, the interval between the central lines of the grooves is 12.5mm, the longitudinal grooves are uniformly distributed in the width direction of the carbon fiber composite material plate cable 5, and the length of the longitudinal grooves is 215mm.
The layout flow chart of the optical fiber sensor module laid on the cable body section in the system of the embodiment of the carbon fiber composite material cable detection system based on the distributed optical fibers shown in fig. 4 comprises the following steps:
wiping the surface of the plate cable body section clean and positioning the optical fiber sensor module 1 to obtain a cable body section of an optical fiber to be paved;
according to the cable section of the optical fiber to be paved, using a glue filling mould to align the paved optical fiber sensor module, and obtaining a cable section for fixing the optical fiber sensor;
Further, as shown in FIG. 12, the embodiment of the system for detecting the cable of the carbon fiber composite material plate based on the distributed optical fibers is shown in a schematic structural diagram of a glue filling mold in the system, wherein the glue filling mold is made of transparent silica gel material, the cross section of the glue filling mold is a trapezoid shape with the upper bottom of 2mm, the lower bottom of 4mm and the height of 1.3mm, a semicircular hole with the diameter of 1mm is arranged in the middle of the bottom of the glue filling mold for placing the optical fiber sensing unit 11 and controlling the colloid shape, and a layer of Vaseline coating is smeared on the inner surface of the glue filling mold so as to avoid the adhesion with the epoxy resin glue material and influence the glue filling quality, the colloid forming and the demolding process
And filling epoxy resin glue into the glue filling mould according to the cable body section for fixing the optical fiber sensor, and naturally solidifying the epoxy resin glue and disassembling the glue filling mould to obtain the optical fiber sensor module arranged on the cable body section of the plate cable.
And respectively installing parallel plate cable anchoring clamps at two ends according to the carbon fiber composite plates with two unanchored ends to obtain the carbon fiber composite plate cable anchoring module 2.
Further, as shown in fig. 5, a flowchart of a carbon fiber composite plate cable anchoring module is obtained in a system of an embodiment of the carbon fiber composite plate cable detection system based on a distributed optical fiber of the present invention, according to the carbon fiber composite plates with two non-anchored ends, parallel plate cable anchoring clamps at two ends are respectively installed, so as to obtain a carbon fiber composite plate cable anchoring module 2, which includes:
According to the carbon fiber composite board with the two ends not anchored, connecting the signal demodulation module with the data processing and display module to obtain a board cable anchoring clamp installation detection device;
according to the plate cable anchoring clamp installation detection device, the plate cable anchoring clamp is installed, strain data of the carbon fiber composite plate cable 5 are detected in real time, and a strain data set during installation of the plate cable anchoring clamp is obtained;
Further, as shown in fig. 13, a schematic diagram of an anchoring fixture for a mounting plate cable in the system based on the embodiment of the distributed optical fiber carbon fiber composite plate cable detection system of the present invention is provided, in which a lower anchorage device, an upper anchorage device and an upper anchorage device are sequentially installed, and a signal demodulation module 3 and a data processing and display module 4 are started, so as to detect strain of a plate cable anchoring section in the whole installation process, and strictly detect that the anchoring fixture generates uneven stress distribution inside the anchoring fixture in the installation process.
According to the strain data set of the plate rope anchoring clamp during installation, the installation scheme of the anchoring clamp is adjusted so that the carbon fiber composite plate rope in the anchoring clamp is uniformly stressed and symmetrically stressed along the axis of the carbon fiber composite plate rope, and the carbon fiber composite plate rope anchoring module 2 is obtained.
A signal demodulation module 3 for demodulating strain information of the optical fiber sensor module 1;
And the data processing and displaying module 4 is used for obtaining and displaying real-time strain data of the carbon fiber composite plate cable 5 and local damage rules and cable force information of the carbon fiber composite plate cable 5 according to the demodulation data of the signal demodulation module 3.
Specifically, a flowchart for obtaining real-time strain data of a carbon fiber composite rope and local damage rule and rope force information of the carbon fiber composite rope in a system of the embodiment of the distributed optical fiber-based carbon fiber composite rope detection system according to the invention shown in fig. 6 and a schematic diagram for detecting the carbon fiber composite rope in different service environments in the system of the embodiment of the distributed optical fiber-based carbon fiber composite rope detection system according to the invention shown in fig. 14, the method for obtaining a mechanical property data set of the carbon fiber composite rope 5 and the local damage rule of the carbon fiber composite rope 5 according to the demodulation data of the signal demodulation module 3 includes:
according to the demodulation data of the signal demodulation module 3, strain distribution data sets of the optical fiber sensors at different section positions of the carbon fiber composite plate cable 5 are obtained;
Further, a stretching environment is selected to obtain a global strain distribution map of the carbon fiber composite plate rope under the stretching environment in the system of the embodiment of the distributed optical fiber-based carbon fiber composite plate rope detection system according to the invention shown in fig. 15 and a transverse strain distribution map of the anchoring section of the carbon fiber composite plate rope under the stretching environment in the system of the embodiment of the distributed optical fiber-based carbon fiber composite plate rope detection system according to the invention shown in fig. 16.
According to the strain distribution data sets obtained by the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope 5, the total stress distribution data set of the carbon fiber composite plate rope 5 is obtained through the formula (1),
Wherein: is the total average stress of the carbon fiber composite board, The method is characterized in that the average strain of an ith optical fiber sensor in the full length range of a plate cable body section at different cross section positions of the carbon fiber composite plate cable is represented by n, the number of optical fiber sensor modules is represented by E, and the Young modulus of the carbon fiber composite plate cable is represented by E;
According to the total stress distribution data set of the carbon fiber composite plate rope 5, the mechanical property data set of the carbon fiber composite plate rope 5 is obtained through the formula (2),
Wherein T is the cable force of the carbon fiber composite material cable, A is the cross-sectional area of the carbon fiber composite material cable;
According to strain distribution data sets of optical fiber sensors at different cross section positions of the carbon fiber composite plate rope 5 and mechanical property data sets of the carbon fiber composite plate rope, analyzing stress amplitude values through a percentile filtering method to obtain a local damage rule of the carbon fiber composite plate rope 5, wherein the local damage rule diagram of the carbon fiber composite plate rope under a stretching environment in the embodiment of the carbon fiber composite plate rope detection system based on the distributed optical fibers is shown in fig. 17;
Further, a graph of the global stress field change rule of the carbon fiber composite plate rope under the stretching environment in the system of the embodiment of the distributed optical fiber-based carbon fiber composite plate rope detection system shown in fig. 18 is obtained through analysis.
The invention provides a carbon fiber composite rope detection method based on distributed optical fibers, which is shown in a flow chart of an embodiment of the carbon fiber composite rope detection method based on the distributed optical fibers in fig. 19, and is realized by a carbon fiber composite rope detection system based on the distributed optical fibers, and comprises the following steps:
s1, selecting a carbon fiber composite plate rope anchoring process according to a carbon fiber composite plate rope to obtain an anchoring scheme of the carbon fiber composite plate rope;
s2, according to the carbon fiber composite material plate rope anchoring scheme, arranging the optical fiber sensor module and fixing to obtain a carbon fiber composite material plate rope acquisition module;
s3, according to the carbon fiber composite plate rope acquisition module, acquiring strain data of the carbon fiber composite plate rope to obtain strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope;
s4, carrying out data processing and calculation according to strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite material plate cable to obtain a mechanical property data set of the carbon fiber composite material plate cable;
S5, according to the strain distribution data sets of the optical fiber sensors at different cross section positions of the carbon fiber composite plate rope and the mechanical property data sets of the carbon fiber composite plate rope, the local damage rule of the carbon fiber composite plate rope is obtained through analysis and displayed.
The invention provides a carbon fiber composite material plate cable detection system and method based on distributed optical fibers, which solves the problems of complex operation of pre-buried optical fiber sensors and difficult restoration and replacement of optical fibers of the optical fiber sensors in the plate cable production stage by arranging distributed optical fiber sensor modules on the surface of a carbon fiber composite material plate cable and a carbon fiber composite material plate cable anchoring module, improves the arrangement efficiency of the optical fiber sensors, realizes the global contact type strain accurate monitoring of the plate cable anchoring section and the plate cable body section of the carbon fiber composite material plate cable by designing the arrangement forms of different optical fiber sensor modules, breaks through the technical problem that strain information of a clamping type plate cable anchoring area is not measurable, improves the installation efficiency and precision of an anchor, realizes the real-time dynamic strain monitoring of the carbon fiber composite material plate cable in the service life process, and finally establishes a carbon fiber composite material plate cable force calculation method to predict the local damage rule of the carbon fiber composite material plate cable.
It will be appreciated that the present application has been described by way of example above and should not be construed to limit the embodiments of the application or the scope of the application. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
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