Movable self-excitation vibration detection equipment, inhaul cable vibration dominant frequency reliability calculation method, device and equipment

Abstract

The invention relates to movable self-excitation vibration detection equipment, and a method, a device and equipment for calculating the reliability of the vibration dominant frequency of an inhaul cable. The method comprises the following steps: acquiring the excitation time of steady-state excitation and the frequency range and the step length of step excitation; performing excitation on the inhaul cable according to the frequency range and the step length to obtain a vibration acceleration signal of the inhaul cable; analyzing and identifying the vibration acceleration signal to obtain a vibration dominant frequency of the inhaul cable; determining excitation frequency data according to the vibration main frequency and the step length, and performing excitation on the inhaul cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data; processing each excitation signal to obtain a corresponding steady-state vibration amplitude; and calculating according to all the steady-state vibration amplitudes to obtain the peak reliability of the vibration dominant frequency of the inhaul cable, thereby realizing the reliability calculation of the vibration dominant frequency of the inhaul cable. And the movable self-excitation vibration detection equipment moves to a preset installation position to obtain a vibration acceleration signal or an excitation vibration signal.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a movable self-excitation detection device, a reliability calculation method, a device and an apparatus for calculating the main frequency of cable vibration. Background Art

[0002] In modern industrial construction, cables are widely used. For example, in cable-stayed bridges, suspension bridges, high-platform suspension cables, high-voltage power lines and other fields, cables are used as key components for load-bearing or power transmission.

[0003] The vibration of short cables (referred to as cables) is affected by various factors, resulting in a small amplitude and the dominant vibration frequency of the cable being drowned out by environmental interference. Due to their short length, high cable force, and relatively high stiffness, cables face a difficult time distributing the load to their more flexible areas over long periods of use, increasing the risk of damage. Therefore, it's difficult to determine the reliability of identifying the dominant vibration frequency. Summary of the Invention

[0004] The present application provides a movable self-excited vibration detection device, a reliability calculation method, device and equipment for the main vibration frequency of the cable, which are used to solve the technical problem that the main vibration frequency identified by the cable cannot be determined to be reliable.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] In one aspect, a reliability calculation method for a main frequency of cable vibration is provided, comprising the following steps:

[0007] Obtaining the excitation time of steady-state excitation and the frequency range and step size of step excitation; exciting the cable according to the frequency range and the step size to obtain a vibration acceleration signal of the cable;

[0008] Analyzing and identifying the vibration acceleration signal to obtain the main vibration frequency of the cable;

[0009] determining excitation frequency data according to the vibration main frequency and the step length, and exciting the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data;

[0010] Processing each of the excitation signals to obtain a corresponding steady-state vibration amplitude;

[0011] The peak reliability of the main frequency of the cable vibration is obtained by calculation based on all the steady-state vibration amplitudes.

[0012] Preferably, analyzing and identifying the vibration acceleration signal to obtain the vibration main frequency includes:

[0013] Performing time-frequency transformation on the vibration acceleration signal using short-time Fourier transform or wavelet transform to obtain a time-frequency graph;

[0014] The maximum vibration frequency is obtained from the time-frequency diagram, and the maximum vibration frequency is used as the main vibration frequency of the cable.

[0015] Preferably, determining the excitation frequency data based on the vibration main frequency and the step length includes: using the vibration main frequency as the first excitation frequency of the excitation frequency data; using the difference between the vibration main frequency and the step length as the second excitation frequency of the excitation frequency data; and using the sum of the vibration main frequency and the step length as the third excitation frequency of the excitation frequency data.

[0016] Preferably, the reliability calculation method of the main vibration frequency of the cable includes: performing Fourier transform processing on each of the excitation signals to obtain the corresponding steady-state vibration amplitude.

[0017] Preferably, if all the steady-state vibration amplitudes include a first steady-state vibration amplitude, a second steady-state vibration amplitude, and a third steady-state vibration amplitude, the steady-state vibration amplitude corresponding to the main vibration frequency is used as the first steady-state vibration amplitude, and the peak reliability of the main vibration frequency of the cable is obtained by calculation based on all the steady-state vibration amplitudes, including:

[0018] Calculating a first reliability based on the first steady-state vibration amplitude and the second steady-state vibration amplitude;

[0019] Calculating a second reliability based on the first steady-state vibration amplitude and the third steady-state vibration amplitude;

[0020] The peak reliability of the main frequency of the cable vibration is obtained by calculation based on the first reliability and the second reliability.

[0021] Preferably, the reliability calculation method of the main vibration frequency of the cable includes: determining whether the main vibration frequency of the cable is reliable according to the peak reliability.

[0022] On the other hand, a movable self-excited vibration detection device is provided, including an excitation body, a detection body and a signal processor, the detection body is arranged on the cable and is located below the excitation body, the excitation body is arranged on the cable and is used to generate vibration excitation to the cable, the detection body is used to collect the acceleration signal generated by the vibration of the cable, and the signal processor is used to process all acceleration signals detected by the detection body according to the above-mentioned reliability calculation method of the main frequency of cable vibration to obtain the peak reliability for evaluating the reliability of the identified vibration main frequency.

[0023] Preferably, the excitation body includes a stabilizing ring, a fastening airbag, an electromagnetic element, a vibration block and a shock-absorbing element. The stabilizing ring is used to be buckled on the cable, the fastening airbag is arranged on the inner ring of the stabilizing ring, the electromagnetic element is arranged on the outer ring of the stabilizing ring, and the shock-absorbing element is arranged on the stabilizing ring at both ends of the electromagnetic element. The two ends of the vibration block are respectively connected to the shock-absorbing element.

[0024] In another aspect, a device for calculating the reliability of the main frequency of cable vibration is provided, comprising a data acquisition module, an analysis and identification module, a signal acquisition module, a signal processing module, and a reliability calculation module;

[0025] The data acquisition module is used to obtain the excitation time of steady-state excitation and the frequency range and step length of step excitation; the cable is excited according to the frequency range and the step length to obtain a vibration acceleration signal of the cable;

[0026] The analysis and identification module is used to analyze and identify the vibration acceleration signal to obtain the main vibration frequency of the cable;

[0027] The signal acquisition module is configured to determine excitation frequency data according to the vibration main frequency and the step size, and to excite the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data;

[0028] The signal processing module is used to process each of the excitation signals to obtain a corresponding steady-state vibration amplitude;

[0029] The reliability calculation module is used to calculate the peak reliability of the main frequency of the cable vibration based on all the steady-state vibration amplitudes.

[0030] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0031] The memory is used to store program code and transmit the program code to the processor;

[0032] The processor is used to execute the above-mentioned method for calculating the reliability of the main frequency of cable vibration according to the instructions in the program code.

[0033] The movable self-excitation detection equipment, the reliability calculation method, device and equipment of the main vibration frequency of the cable, the reliability calculation method of the main vibration frequency of the cable comprises the following steps: obtaining the excitation time of steady-state excitation and the frequency range and step length of step excitation; exciting the cable according to the frequency range and step length to obtain the vibration acceleration signal of the cable; analyzing and identifying the vibration acceleration signal to obtain the main vibration frequency of the cable; determining the excitation frequency data according to the main vibration frequency and step length, and exciting the cable according to the excitation frequency data and the excitation time to obtain the excitation signal corresponding to each excitation frequency in the excitation frequency data; processing each excitation signal to obtain the corresponding steady-state vibration amplitude; and calculating based on all steady-state vibration amplitudes to obtain the peak reliability of the main vibration frequency of the cable.

[0034] It can be seen from the above technical solution that the present application has the following advantages: the reliability calculation method of the main vibration frequency of the cable identifies the main vibration frequency of the cable through the vibration acceleration signal, and then obtains multiple excitation signals according to the main vibration frequency, and calculates the peak reliability of all excitation signals to realize the reliability calculation of the main vibration frequency of the cable, which solves the existing technical problem that the main vibration frequency identified by the cable cannot be determined whether it is reliable.

[0035] The reliability calculation device for the main frequency of cable vibration realizes the reliability calculation of the main frequency of cable vibration through a data acquisition module, an analysis and identification module, a signal acquisition module, a signal processing module and a reliability calculation module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0037] Figure 1 This is a flowchart of the steps of the method for calculating the reliability of the main frequency of cable vibration according to an embodiment of the present application;

[0038] Figure 2 This is a structural diagram of the movable self-excited vibration detection device according to an embodiment of the present application;

[0039] Figure 3 Schematic diagram of the framework of the device for calculating the reliability of the main frequency of cable vibration according to an embodiment of the present application;

[0040] Figure 4 This is a schematic diagram of the terminal device described in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; internal connections between two components, or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] The embodiments of the present application provide a movable self-excited vibration detection device, a reliability calculation method, device and equipment for the main vibration frequency of the cable, which solves the technical problem that the existing main vibration frequency identified by the cable cannot be determined to be reliable.

[0045] Example 1:

[0046] Figure 1 This is a flowchart of the steps of the method for calculating the reliability of the main frequency of cable vibration described in an embodiment of the present application. Figure 2 This is a schematic structural diagram of the movable self-excited vibration detection device described in an embodiment of the present application.

[0047] like Figure 1 As shown, an embodiment of the present application provides a method for calculating the reliability of the main frequency of cable vibration, comprising the following steps:

[0048] S1. Obtain the excitation time of steady-state excitation and the frequency range and step size of step excitation; excite the cable according to the frequency range and step size to obtain the vibration acceleration signal of the cable.

[0049] It should be noted that step S1 is to obtain the excitation time of steady-state excitation and the frequency range and step length of step excitation to provide data for subsequent steps; secondly, to obtain the vibration acceleration signal of the cable through the mobile self-excitation detection equipment according to the step excitation. In this embodiment, the frequency range can be f min ~f max , the step size is Δf. According to the frequency range and step size, press the excitation frequency f from f min Increase to f with step size Δf max The cable is excited to obtain the vibration acceleration signal a(t) of the cable, where t is time. The excitation frequency f=f min , f min +Δf,f min +2Δf,...,f max .

[0050] like Figure 2 As shown, in an embodiment of the present application, a movable self-excited vibration detection device includes an excitation body 101, a detection body and a signal processor. The detection body is arranged below the excitation body 101. The excitation body 101 is arranged on the cable and is used to generate vibration excitation for the cable. The detection body is used to collect acceleration signals generated by the cable due to vibration. The signal processor is used to process all acceleration signals detected by the detection body according to the reliability calculation method of the main frequency of vibration of the cable to obtain a peak reliability for evaluating the reliability of the main frequency of vibration. The excitation body 101 includes a stabilizing ring 102, a fastening airbag 103, an electromagnetic element 104, a vibration block 105 and a shock absorbing element 106. The stabilizing ring is used to be buckled on the cable, the fastening airbag is arranged on the inner ring of the stabilizing ring, the electromagnetic element is arranged on the outer ring of the stabilizing ring, and shock absorbing elements are arranged on the stabilizing rings at both ends of the electromagnetic element. The two ends of the vibration block are respectively connected to the shock absorbing elements.

[0051] It should be noted that if Figure 2 As shown, the shock absorbing element 106 can be a shock absorbing spring. The stabilizing ring 102 can be a barrel-shaped structure with openings on both sides of the stabilizing ring 102, which can be buckled on the cable. When using the installation of the excitation body 101, first buckle the cable with the stabilizing ring 102. The excitation body 101 can be moved to the preset installation position of the cable (which can be an excitation test point) by using a carrying device or manually. In the first stage, the preset installation position can be in the middle of the cable, and the subsequent stage excitation body 101 can be at the cable L / (2 i) position, where L is the length of the cable and i is the order. Activate the tightening airbag 103 to a predetermined pressure to stabilize the excitation body 101 (the excitation body 101 must be fixed and move with the main cable). Power is supplied to the electromagnetic element 104, inputting a current signal to the electromagnetic element 104. This causes the vibration block 105 to be acted upon by an electromagnetic force, generating vibration excitation on the cable. The detection body can be an acceleration sensor, independently fixed to the cable and located below the excitation body 101.

[0052] In the embodiment of the present application, a short vibration acceleration signal is obtained by frequency sampling scanning of the movable self-excitation detection device, which can be understood as: given a starting vibration frequency f min and the final vibration frequency f max , then the excitation body 101 is stepped (excitation frequency f=f min , f min +Δf,f min +2Δf,...,f max ) changes the frequency to send vibration to the cable, and another detection body detects the vibration amplitude to obtain the acceleration signal of the cable.

[0053] S2. Analyze and identify the vibration acceleration signal to obtain the main vibration frequency of the cable.

[0054] It should be noted that in step S2, the vibration acceleration signal a(t) obtained in step S1 is analyzed and identified to obtain the main vibration frequency f of the cable. zmax , providing data for subsequent analysis of the reliability calculation of the main frequency of cable vibration.

[0055] S3. Determine the excitation frequency data according to the vibration main frequency and the step size, and excite the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data.

[0056] It should be noted that in step S3, based on the step length obtained in step S1 and the vibration main frequency data obtained in step S2, the cable is excited using the movable self-excitation detection device according to the excitation frequency data and the excitation time, and the detection body is used to obtain the excitation signal corresponding to each excitation frequency in the excitation frequency data. In this embodiment, determining the excitation frequency data based on the vibration main frequency and step length includes: zmax The first excitation frequency f as the excitation frequency data zmax ; The vibration frequency f zmax The difference from the step length Δf is used as the second excitation frequency f of the excitation frequency data zmax -Δf; the vibration frequency f zmax The sum of the step length Δf is used as the third excitation frequency f of the excitation frequency data. zmax+Δf. The movable self-excitation detection equipment is f zmax -Δf, f zmax and f zmax +Δf three frequencies are used to excite the cable according to the excitation time to obtain the corresponding excitation signal a fzmax-Δf (t), a fzmax (t) and a fzmax+Δf (t). The excitation time can be selected as 5 minutes.

[0057] S4. Process each excitation signal to obtain the corresponding steady-state vibration amplitude.

[0058] It should be noted that in step S4, Fourier transform processing is performed on each excitation signal to obtain the corresponding steady-state vibration amplitude. In this embodiment, if the excitation signal obtained is a fzmax-Δf (t), a fzmax (t) and a fzmax+Δf (t), the corresponding steady-state vibration amplitudes are the second steady-state vibration amplitude A fzmax-Δf , the first steady-state vibration amplitude A fzmax and the third steady-state vibration amplitude A fzmax+Δf Specifically:

[0059]

[0060] Where F{} represents the Fourier transform of the signal.

[0061] S5. Calculate the peak reliability of the main frequency of cable vibration based on all steady-state vibration amplitudes.

[0062] It should be noted that in step S5, the peak reliability used to evaluate whether the main vibration frequency of the cable obtained in step S2 is reliable is calculated based on all the steady-state vibration amplitudes obtained in step S4. In this embodiment, the reliability calculation method of the main vibration frequency of the cable includes: determining whether the main vibration frequency of the cable is reliable based on the peak reliability. When the peak reliability is greater than the reliability threshold, it means that the identified main vibration frequency is reliable. The reliability threshold can be set according to needs. The larger the peak reliability value, the smaller the frequency deviation of the identified main vibration frequency.

[0063] In an embodiment of the present application, the reliability calculation method of the main vibration frequency of the cable first identifies the main vibration frequency of the cable through a vibration acceleration signal, then obtains multiple excitation signals based on the main vibration frequency, processes and calculates all the excitation signals to obtain the peak reliability, and realizes the reliability calculation of the main vibration frequency of the cable.

[0064] The present application provides a reliability calculation method for a cable's main vibration frequency, comprising obtaining an excitation time for steady-state excitation and a frequency range and step size for step excitation; exciting the cable according to the frequency range and step size to obtain a vibration acceleration signal for the cable; analyzing and identifying the vibration acceleration signal to obtain the cable's main vibration frequency; determining excitation frequency data according to the main vibration frequency and step size; exciting the cable according to the excitation frequency data and excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data; processing each excitation signal to obtain a corresponding steady-state vibration amplitude; and calculating the peak reliability of the cable's main vibration frequency based on all steady-state vibration amplitudes. This reliability calculation method for the cable's main vibration frequency identifies the cable's main vibration frequency using a vibration acceleration signal, then obtains multiple excitation signals based on the main vibration frequency, processes and calculates the peak reliability of all excitation signals, and thereby implements reliability calculation for the cable's main vibration frequency, resolving the existing technical problem of being unable to determine the reliability of the identified cable's main vibration frequency.

[0065] In one embodiment of the present application, the vibration acceleration signal is analyzed and identified to obtain the vibration main frequency, which includes:

[0066] The vibration acceleration signal is subjected to time-frequency transformation using short-time Fourier transform or wavelet transform to obtain a time-frequency diagram;

[0067] The maximum vibration frequency is obtained from the time-frequency diagram and is taken as the main vibration frequency of the cable.

[0068] It should be noted that the expression of short-time Fourier transform is:

[0069]

[0070] Where C(t, f) represents the time-frequency graph; is a variable, similar to time; is the window function, and f is the frequency. In the time-frequency graph C(t, f), the first formula is used to find the time t when the vibration amplitude is the largest. max and the corresponding frequency, and take this frequency as the main vibration frequency f zmax The first formula is:

[0071] .

[0072] In the embodiment of the present application, if all steady-state vibration amplitudes include the first steady-state vibration amplitude A fzmax , the second steady-state vibration amplitude A fzmax-Δf and the third steady-state vibration amplitude A fzmax+Δf , the steady-state vibration amplitude corresponding to the main vibration frequency is taken as the first steady-state vibration amplitude A fzmax , calculated based on all steady-state vibration amplitudes, the peak reliability of the main frequency of cable vibration includes:

[0073] Calculating a first reliability based on the first steady-state vibration amplitude and the second steady-state vibration amplitude;

[0074] Calculating according to the first steady-state vibration amplitude and the third steady-state vibration amplitude to obtain a second reliability;

[0075] The peak reliability of the main frequency of cable vibration is calculated based on the first reliability and the second reliability.

[0076] It should be noted that the first reliability is calculated using the first reliability formula based on the first and second steady-state vibration amplitudes. The second reliability is calculated using the second reliability formula based on the first and third steady-state vibration amplitudes. The average of the first and second reliability values ​​is used as the peak reliability of the cable's main vibration frequency.

[0077] In the embodiment of the present application, the first reliability formula is: D - =(A fzmax -A fzmax-Δf ) / A fzmax ×100%,D - is the first reliability; the second reliability formula is: D + =(A fzmax -A fzmax+Δf ) / A fzmax ×100%,D + The second reliability.

[0078] Example 2:

[0079] Figure 3 Schematic diagram of the framework of the device for calculating the reliability of the main frequency of cable vibration described in an embodiment of the present application.

[0080] like Figure 3 As shown, an embodiment of the present application provides a reliability calculation device for the main frequency of cable vibration, comprising a data acquisition module 10, an analysis and identification module 20, a signal acquisition module 30, a signal processing module 40 and a reliability calculation module 50;

[0081] The data acquisition module 10 is used to obtain the excitation time of the steady-state excitation and the frequency range and step size of the step excitation; the cable is excited according to the frequency range and step size to obtain the vibration acceleration signal of the cable;

[0082] The analysis and identification module 20 is used to analyze and identify the vibration acceleration signal to obtain the main vibration frequency of the cable;

[0083] The signal acquisition module 30 is used to determine the excitation frequency data according to the vibration main frequency and the step size, and to excite the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data;

[0084] The signal processing module 40 is used to process each excitation signal to obtain the corresponding steady-state vibration amplitude;

[0085] The reliability calculation module 50 is used to calculate the peak reliability of the main frequency of the cable vibration based on all steady-state vibration amplitudes.

[0086] It should be noted that the modules in the apparatus of Example 2 have already been described in the steps of the method of Example 1. Therefore, the modules of the apparatus for calculating the reliability of the cable's main vibration frequency will not be repeated in this embodiment. In this embodiment, the apparatus for calculating the reliability of the cable's main vibration frequency calculates the reliability of the cable's main vibration frequency through a data acquisition module, an analysis and identification module, a signal acquisition module, a signal processing module, and a reliability calculation module.

[0087] Example 3:

[0088] Figure 4 This is a schematic diagram of the terminal device described in an embodiment of the present application.

[0089] like Figure 4 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0090] A memory, configured to store program codes and transmit the program codes to a processor;

[0091] The processor is configured to execute the reliability calculation method of the main frequency of cable vibration according to the instructions in the program code.

[0092] It should be noted that the processor is configured to execute the steps of the above-mentioned embodiment of the method for calculating the reliability of the main frequency of cable vibration according to the instructions in the program code. Alternatively, the processor implements the functions of the modules / units in the above-mentioned system / device embodiments when executing the computer program.

[0093] For example, a computer program may be divided into one or more modules / units, one or more of which are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0094] Terminal devices can be computing devices such as desktop computers, laptops, PDAs, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will appreciate that this does not constitute a limitation on terminal devices and may include more or fewer components than shown, or a combination of certain components, or different components. For example, terminal devices may also include input / output devices, network access devices, buses, and the like.

[0095] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0096] Memory can be an internal storage unit of a terminal device, such as a hard drive or memory. It can also be an external storage device, such as a plug-in hard drive, a SmartMedia Card (SMC), a Secure Digital (SD) card, or a flash memory card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or is about to be output.

[0097] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0099] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0100] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0101] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0102] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A reliability calculation method for the main frequency of cable vibration, characterized in that: The following steps are involved: Obtaining the excitation time of steady-state excitation and the frequency range and step size of step excitation; exciting the cable according to the frequency range and the step size to obtain a vibration acceleration signal of the cable; Analyzing and identifying the vibration acceleration signal to obtain the main vibration frequency of the cable; determining excitation frequency data according to the vibration main frequency and the step length, and exciting the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data; Processing each of the excitation signals to obtain a corresponding steady-state vibration amplitude; The peak reliability of the main frequency of the cable vibration is obtained by calculation based on all the steady-state vibration amplitudes.

2. The reliability calculation method of the cable vibration main frequency according to claim 1 is characterized in that: The vibration acceleration signal is analyzed and identified to obtain the vibration main frequency, which includes: Performing time-frequency transformation on the vibration acceleration signal using short-time Fourier transform or wavelet transform to obtain a time-frequency graph; The maximum vibration frequency is obtained from the time-frequency diagram, and the maximum vibration frequency is used as the main vibration frequency of the cable.

3. The reliability calculation method of the cable vibration main frequency according to claim 1 is characterized in that: Determining the excitation frequency data according to the main vibration frequency and the step length includes: using the main vibration frequency as the first excitation frequency of the excitation frequency data; using the difference between the main vibration frequency and the step length as the second excitation frequency of the excitation frequency data; and using the sum of the main vibration frequency and the step length as the third excitation frequency of the excitation frequency data.

4. The reliability calculation method of the cable vibration main frequency according to claim 1 is characterized in that: include: Perform Fourier transform processing on each of the excitation signals to obtain the corresponding steady-state vibration amplitude.

5. The reliability calculation method of the main frequency of cable vibration according to claim 1 is characterized in that: If all the steady-state vibration amplitudes include a first steady-state vibration amplitude, a second steady-state vibration amplitude, and a third steady-state vibration amplitude, and the steady-state vibration amplitude corresponding to the main vibration frequency is used as the first steady-state vibration amplitude, the peak reliability of the main vibration frequency of the cable is obtained by calculation based on all the steady-state vibration amplitudes, including: Calculating a first reliability based on the first steady-state vibration amplitude and the second steady-state vibration amplitude; Calculating a second reliability based on the first steady-state vibration amplitude and the third steady-state vibration amplitude; The peak reliability of the main frequency of the cable vibration is obtained by calculation based on the first reliability and the second reliability.

6. The reliability calculation method of the main frequency of cable vibration according to any one of claims 1 to 5, characterized in that: include: Whether the vibration main frequency of the cable is reliably identified is determined according to the peak reliability.

7. A movable self-excited vibration detection device, characterized in that: It includes an excitation body, a detection body and a signal processor, the detection body is arranged on the cable and is located below the excitation body, the excitation body is arranged on the cable and is used to generate vibration excitation to the cable, the detection body is used to collect the acceleration signal of the cable generated by vibration, and the signal processor is used to process all acceleration signals detected by the detection body according to the reliability calculation method of the cable vibration main frequency as described in any one of claims 1-6, and obtain the peak reliability for evaluating the reliability of the identified vibration main frequency.

8. The movable self-excited vibration detection device according to claim 7, characterized in that: The excitation body includes a stabilizing ring, a fastening airbag, an electromagnetic element, a vibration block and a shock-absorbing element. The stabilizing ring is used to be buckled on the cable, the fastening airbag is arranged on the inner ring of the stabilizing ring, the electromagnetic element is arranged on the outer ring of the stabilizing ring, and the shock-absorbing element is arranged on the stabilizing ring at both ends of the electromagnetic element. The two ends of the vibration block are respectively connected to the shock-absorbing element.

9. A reliability calculation device for the main frequency of cable vibration, characterized in that: include: Data acquisition module, analysis and identification module, signal acquisition module, signal processing module and reliability calculation module; The data acquisition module is used to obtain the excitation time of steady-state excitation and the frequency range and step length of step excitation; the cable is excited according to the frequency range and the step length to obtain a vibration acceleration signal of the cable; The analysis and identification module is used to analyze and identify the vibration acceleration signal to obtain the main vibration frequency of the cable; The signal acquisition module is configured to determine excitation frequency data according to the vibration main frequency and the step size, and to excite the cable according to the excitation frequency data and the excitation time to obtain an excitation signal corresponding to each excitation frequency in the excitation frequency data; The signal processing module is used to process each of the excitation signals to obtain a corresponding steady-state vibration amplitude; The reliability calculation module is used to calculate the peak reliability of the main frequency of the cable vibration based on all the steady-state vibration amplitudes.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the reliability calculation method for the main frequency of cable vibration according to any one of claims 1 to 6 according to the instructions in the program code.

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