Parallel steel wire rope corrosion defect detection structure based on magnetostrictive longitudinal guided waves
By using a detection structure based on magnetostrictive longitudinal guided waves, the echo signals of rust defects are distinguished by the linear magnetostrictive effect and the initial phase difference method. This solves the problems of health hazards and low efficiency of existing detection methods, and realizes harmless and accurate detection of rust defects and bridge safety assessment.
Patent Information
- Application Number
- CN202520051042.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing methods for detecting corrosion defects in parallel steel wire cables suffer from health hazards and low detection efficiency. In particular, radiographic testing is harmful to the health of testing personnel and makes it difficult to distinguish the echo signals of corrosion defects from those of protective layer damage.
A detection structure based on magnetostrictive longitudinal guided waves is adopted, including a user interaction module, an operating system module, a guided wave control module, a sensor management module, a longitudinal guided wave excitation sensor, and a longitudinal guided wave receiving sensor. The guided waves are excited and received in parallel steel wires using the linear magnetostrictive effect, and the echo signals of rust and protective layer defects are distinguished by the initial phase difference method.
It achieves harmless detection, can accurately identify and locate rust defects, improves detection efficiency, ensures bridge safety, avoids bridge collapse caused by rust, and has significant economic benefits.
Smart Images
Figure CN223770143U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of non-destructive testing technology for corrosion defects in parallel steel wire cables, and particularly relates to a detection structure for corrosion defects in parallel steel wire cables based on magnetostrictive longitudinal guided waves. Background Technology
[0002] Parallel wire cables are one of the main load-bearing components of long-span cable-stayed bridges. As bridges age, humid air seeps into the parallel wire cables, causing corrosion defects. These corrosion defects, accumulated over time, reduce the load-bearing capacity of the wire cables and, in severe cases, lead to major safety accidents. Therefore, it is crucial to promptly detect potential corrosion defects within the wire cables, prevent their further development, and ensure the safety of the bridge structure.
[0003] Currently, the commonly used method for detecting corrosion defects in parallel steel wire cables in my country is radiographic testing. However, this method has the disadvantage that the radiation is radioactive, posing a health hazard to inspectors. Magnetostrictive guided wave testing, based on the property of guided waves propagating parallel to the boundary, only requires single-point excitation of a magnetostrictive sensor to achieve the entire detection process. Therefore, compared with the commonly used radiographic testing method, magnetostrictive guided wave testing can not only determine the location of corrosion defects inside the material but also does not pose a health hazard to inspectors, showing good application prospects and practical value. Currently, some domestic scholars have conducted relevant research on the application of magnetostrictive guided wave testing. Patent document CN111398422A designs a guided wave detection method for defects in tank-shaped containers, including a guided wave transceiver probe, a guided wave controller, and a guided wave depth offset imaging system. This system can locate and accurately image corrosion defects in tank-shaped containers.
[0004] Defects in parallel wire cables include internal corrosion defects and external protective layer damage defects. Echo data obtained through guided wave detection contains echo signals from both corrosion and protective layer damage defects in the parallel wire cables. Furthermore, the echo signals from corrosion defects and protective layer damage defects do not show significant differences in waveform representation, making the identification of internal corrosion defects in parallel wire cables a crucial technical problem that needs to be solved. Utility Model Content
[0005] The present invention aims to provide a parallel steel wire cable corrosion defect detection structure based on magnetostrictive longitudinal guided waves, so as to solve the health hazards and detection efficiency problems of existing detection methods.
[0006] To solve the above problems, this utility model is implemented as follows: a parallel steel wire corrosion defect detection structure based on magnetostrictive longitudinal guided waves, comprising: a user interaction module, an operating system module, a guided wave control module, a sensor management module, a longitudinal guided wave excitation sensor, and a longitudinal guided wave receiving sensor. The user interaction module is connected to the operating system module, the operating system module is connected to the guided wave control module, the guided wave control module is interconnected with the sensor management module, and the longitudinal guided wave excitation sensor and the longitudinal guided wave receiving sensor are respectively interconnected with the sensor management module.
[0007] Preferably, the user interaction module consists of a display screen and a numeric keypad, wherein the display screen is a liquid crystal display screen.
[0008] Preferably, the operating system module is an embedded operating system, which is a computer operating system.
[0009] Preferably, the waveguide control module is a combined circuit comprising a sine wave signal generation circuit, a signal acquisition and amplification circuit, and an analog filtering circuit. The sine wave signal generation circuit and the signal acquisition and amplification circuit include a power amplifier and a transformer, and the analog filtering circuit includes a monolithic integrated active filter and a filtering element.
[0010] Preferably, the sensor management module is a programmable signal distribution circuit, which includes a counter, an electronic chip, and a microcontroller.
[0011] Preferably, the longitudinal guided wave excitation sensor and the longitudinal guided wave receiving sensor are installed at sensor arrangement points on the surface of the parallel steel wire cable, and the longitudinal guided wave excitation sensor generates longitudinal guided waves using the linear magnetostrictive effect.
[0012] Preferably, the longitudinal guided wave receiver sensor utilizes the inverse effect of linear magnetostriction to receive longitudinal guided wave echo signals in a parallel steel wire cable.
[0013] Compared with related technologies, the parallel steel wire corrosion defect detection structure based on magnetostrictive longitudinal guided waves provided by this utility model has the following beneficial effects:
[0014] 1. This utility model is based on the linear magnetostrictive effect and the mechanism of longitudinal guided wave propagation in parallel steel wires. By installing a longitudinal guided wave excitation sensor and a longitudinal guided wave receiving sensor on the parallel steel wires, a longitudinal guided wave of a specified frequency is excited in the parallel steel wires. Its principle is easy to understand, the method is simple, and it does not cause any harm to the health of the testing personnel.
[0015] 2. Through this utility model, the echo signal of the rust defect of the parallel steel wire cable can be identified more accurately, the rust defect of the steel wire cable can be detected more conveniently, the specific location of the rust defect in the parallel steel wire cable can be determined, and the specific location of the rust defect in the parallel steel wire cable can be displayed on the display screen of the user interaction module, so that the location of the rust defect in the steel wire cable can be found in a timely and accurate manner.
[0016] 3. This utility model can assess the corrosion status of parallel wire cables, providing effective support for the operational safety of in-service parallel wire cables and accurate data assurance for the maintenance of parallel wire cables. It can also prevent the overall collapse of bridges caused by corrosion defects in parallel wire cables, improve the efficiency of inspection work, and maximize economic benefits. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the detection structure of this utility model.
[0018] Figure 2 This is a flowchart illustrating the structure of this utility model.
[0019] Figure 3 This is a schematic diagram illustrating the implementation process of one embodiment of the present utility model.
[0020] Reference numerals: 1. User interaction module; 2. Operating system module; 3. Waveguide control module; 4. Sensor management module; 5. Longitudinal waveguide excitation sensor; 6. Longitudinal waveguide receiving sensor; 7. Parallel steel wire; 8. Excitation sensor placement point; 9. Receiving sensor placement point; 10. Corrosion defect; 11. Protective layer damage defect; 12. Corrosion defect echo signal; 13. Protective layer damage defect echo signal. Detailed Implementation
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order; the terms "inner," "outer," "left," and "right" indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention.
[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0023] This utility model embodiment provides a parallel steel wire cable corrosion defect detection structure based on magnetostrictive longitudinal waveguide, such as... Figure 1-3 As shown, the parallel steel wire corrosion defect detection structure based on magnetostrictive longitudinal guided waves includes: a user interaction module 1, an operating system module 2, a guided wave control module 3, a sensor management module 4, a longitudinal guided wave excitation sensor 5, and a longitudinal guided wave receiving sensor 6. The user interaction module 1 is connected to the operating system module 2, the operating system module 2 is connected to the guided wave control module 3, the guided wave control module 3 is interconnected with the sensor management module 4, and the longitudinal guided wave excitation sensor 5 and the longitudinal guided wave receiving sensor 6 are interconnected with the sensor management module 4 respectively.
[0024] The user interaction module 1 consists of a display screen and a numeric keypad, and the display screen is an LCD screen.
[0025] The operating system module 2 is an embedded operating system, which is a computer operating system.
[0026] The waveguide control module 3 is a combined circuit comprising a sine wave signal generation circuit, a signal acquisition and amplification circuit, and an analog filtering circuit. The sine wave signal generation circuit and the signal acquisition and amplification circuit include a power amplifier and a transformer, and the analog filtering circuit includes a monolithic integrated active filter and a filtering element.
[0027] The sensor management module 4 is a programmable signal distribution circuit, which includes a counter, an electronic chip, and a microcontroller.
[0028] The longitudinal waveguide excitation sensor 5 and the longitudinal waveguide receiving sensor 6 are mounted on the sensor arrangement point on the surface of the parallel steel wire cable 7. The longitudinal waveguide excitation sensor 5 generates longitudinal waves using the linear magnetostrictive effect.
[0029] The longitudinal guided wave receiver sensor 6 utilizes the inverse effect of linear magnetostriction to receive longitudinal guided wave echo signals on the parallel steel wire cable 7.
[0030] It should be noted that, in this invention, a longitudinal guided wave excitation sensor arrangement point 8 and a longitudinal guided wave receiving sensor arrangement point 9 are respectively set on both sides of the parallel steel wire cable 7, and the longitudinal guided wave excitation sensor 5 and the longitudinal guided wave receiving sensor 6 are respectively set at the arrangement points. According to the diameter parameter of the parallel steel wire cable 7, the pre-calculated longitudinal guided wave dispersion curve is stored in the operating system module 2;
[0031] In the user interaction module 1, the number of waveform signal pulses and the diameter of the parallel steel wire 7 are input. The operating system module 2 selects a suitable longitudinal guided wave dispersion curve and propagation speed according to the number of waveform signal pulses and the diameter of the parallel steel wire 7, matches the excitation frequency of the longitudinal modal guided wave, and sends it to the guided wave control module 3 after converting it into a frequency selection signal.
[0032] After receiving the frequency selection signal, the waveguide control module 3 generates a waveguide excitation signal and sends it to the sensor management module 4. The sensor management module 4 generates a pulse electrical signal to determine the normal coordinated operation of the longitudinal waveguide excitation sensor 5 and the longitudinal waveguide receiving sensor 6, ensuring that the excitation sensor is in the excitation waveguide state and the receiving sensor is in the normal receiving waveguide state during operation. The waveguide excitation signal is then transmitted to the longitudinal waveguide excitation sensor 5.
[0033] The longitudinal guided wave excitation sensor 5 excites a longitudinal guided wave in the parallel steel wire cable 7. When it encounters a defect, it generates a longitudinal guided wave echo signal, which is received by the longitudinal guided wave excitation sensor 5. The longitudinal guided wave echo signal is transmitted to the guided wave control module 3 via the sensor management module 4. After amplifying and filtering the echo signal, the guided wave control module 3 transmits the digitized echo signal to the operating system module 2.
[0034] Operating system module 2 uses the initial phase difference method to distinguish the longitudinal guided wave echo signal 12 of the steel wire cable corrosion defect and the longitudinal guided wave echo signal 13 of the protective layer damage defect based on the initial phase of the longitudinal guided wave excitation signal and the longitudinal guided wave echo signal.
[0035] After confirming that the longitudinal guided wave echo signal is the corrosion defect echo signal 12, the operating system module 2 calculates the specific location of the corrosion defect 10 on the parallel steel wire cable 7 by multiplying the propagation speed of the longitudinal guided wave by its frequency. The location information of the corrosion defect 10 is then transmitted back to the user interaction module 1 and displayed on its screen.
[0036] The working steps of the parallel steel wire cable corrosion defect detection structure based on magnetostrictive longitudinal waveguide provided by this utility model are as follows:
[0037] Step 1: Start the user interaction module 1. The operator sets the working parameters in the user interaction module 1 and then transmits the working parameters set by the operator to the operating system module 2.
[0038] Step 2: The operating system module 2 obtains the excitation frequency and propagation speed of the longitudinal guided wave based on the waveform signal pulse number and the diameter of the parallel steel wire 7 in the working parameters, and converts the excitation frequency of the longitudinal guided wave into a frequency selection signal and sends it to the guided wave control module 3.
[0039] Step 3: The waveguide control module 3 receives the frequency selection signal, generates a longitudinal waveguide excitation signal of the corresponding frequency, and sends the longitudinal waveguide excitation signal to the sensor management module 4.
[0040] Step 4: The sensor management module 4 sends a pulse electrical signal to enable the longitudinal guided wave excitation sensor 5 and the longitudinal guided wave receiving sensor 6 to work together and distribute the longitudinal guided wave excitation signal of the corresponding frequency generated by the guided wave control module 3 to the longitudinal guided wave excitation sensor 5.
[0041] Step 5: The longitudinal guided wave excitation sensor 5 excites the longitudinal guided wave on the parallel steel wire cable 7. The longitudinal guided wave echo signal is transmitted to the longitudinal guided wave receiving sensor 6 through the sensor management module 4 and then to the guided wave control module 3. After passing through the amplification and filtering steps in the guided wave control module 3, the digital longitudinal guided wave echo signal is transmitted back to the operating system module 2.
[0042] Step six, the operating system module 2 normalizes the digital longitudinal guided wave echo signal obtained in step five and the longitudinal guided wave excitation signal sent in step four.
[0043] Step 7: Perform a subtraction operation on the initial phase of the normalized longitudinal guided wave echo signal and the longitudinal guided wave excitation signal to obtain the initial phase difference between the longitudinal guided wave excitation signal and the longitudinal guided wave echo signal.
[0044] Step 8: Determine whether the longitudinal guided wave echo signal is the echo signal 12 of the parallel wire cable 7 corrosion defect 10. When the initial phase difference between the longitudinal guided wave echo signal and the longitudinal guided wave excitation signal is greater than or equal to 90 degrees, it indicates that the echo signal belongs to the echo signal 12 of the parallel wire cable 7 corrosion defect 10; when the initial phase difference between the longitudinal guided wave echo signal and the longitudinal guided wave excitation signal is less than 90 degrees, it indicates that the echo signal does not belong to the echo signal 12 of the parallel wire cable 7 corrosion defect.
[0045] Step nine: After confirming in step eight that the longitudinal guided wave echo signal is the rust defect echo signal 12, the distance from the rust defect 10 to the longitudinal guided wave excitation sensor 5 and the longitudinal guided wave receiving sensor 6 can be obtained by multiplying the time difference between the longitudinal guided wave excitation signal and the time difference between receiving the rust defect longitudinal guided wave echo signal 12 with the set longitudinal guided wave propagation speed. This determines the location of the rust defect 10 and displays the location information of the rust defect 10 on the display screen of the user interaction module 1.
[0046] Compared with related technologies, the parallel steel wire corrosion defect detection structure based on magnetostrictive longitudinal guided waves provided by this utility model has the following beneficial effects:
[0047] 1. This utility model is based on the linear magnetostriction effect and the mechanism of longitudinal guided wave propagation in parallel steel wire cable 7. By installing longitudinal guided wave excitation sensor 5 and longitudinal guided wave receiving sensor 6 on the parallel steel wire cable 7, a longitudinal guided wave of a specified frequency is excited in the parallel steel wire cable 7. Its principle is easy to understand, the method is simple, and it does not cause harm to the health of the testing personnel.
[0048] 2. Through this utility model, the echo signal of the rust defect 10 of the parallel steel wire cable can be identified more accurately, the rust defect 10 of the steel wire cable can be detected more conveniently, the specific location of the rust defect 10 in the parallel steel wire cable 7 can be determined, and the specific location of the rust defect 10 in the parallel steel wire cable 7 can be displayed on the display screen of the user interaction module 1, so that the location of the rust defect 10 in the steel wire cable can be found in a timely and accurate manner.
[0049] 3. This utility model can assess the corrosion status of parallel steel wire cables 7, providing effective support for the operational safety of in-service parallel steel wire cables 7, and providing accurate data assurance for the maintenance of parallel steel wire cables 7, avoiding the overall collapse of the bridge caused by corrosion defects 10 of parallel steel wire cables 7, which is conducive to improving the efficiency of inspection work and maximizing economic benefits.
[0050] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.
[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.
Claims
1. A structure for detecting corrosion defects of a parallel wire cable based on magnetostrictive longitudinal guided waves, characterized by, The application relates to a longitudinal wave sensor system, which comprises a user interaction module, an operating system module, a wave control module, a sensor management module, a longitudinal wave excitation sensor and a longitudinal wave receiving sensor. The user interaction module is composed of a display screen and a digital keyboard, and the display screen is a liquid crystal display screen.
2. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein, The operating system module is an embedded operating system, and the embedded operating system is a computer operating system.
3. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein, The wave control module is a combined circuit comprising a sinusoidal signal generating circuit, a signal collecting and amplifying circuit and an analog filter circuit, the sinusoidal signal generating circuit and the signal collecting and amplifying circuit comprise a power amplifier and a transformer, and the analog filter circuit comprises a single-chip integrated active filter and a filter element.
4. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein, The sensor management module is a programmable signal distribution circuit, and the signal distribution circuit comprises a counter, an electronic chip and a single-chip microcomputer.
5. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein, The longitudinal wave excitation sensor and the longitudinal wave receiving sensor are installed on a sensor arrangement point on the surface of a parallel steel wire cable, and the longitudinal wave excitation sensor generates longitudinal waves by utilizing a linear magnetostrictive effect.
6. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein, The longitudinal wave receiving sensor receives longitudinal wave echo signals by utilizing a linear magnetostrictive reverse effect.
7. The magnetostrictive longitudinal guided wave based parallel wire cable corrosion defect detection structure of claim 1, wherein,
Citation Information
Patent Citations
Defect guided wave detection method of pot-shaped container
CN111398422A