Evaluation method, device, electronic device and storage medium for rail expansion adjuster

Abstract

The embodiments of the present application provide an evaluation method, device, electronic device and storage medium for a rail expansion and contraction adjuster, which relates to the field of railway tracks. The radar signals of each measuring point are collected, and each radar signal is demodulated to obtain dynamic vibration displacement information of each measuring point. Each dynamic vibration displacement information is subjected to a short-time Fourier transform to obtain a time-frequency spectrum of each dynamic vibration displacement information, and the vibration frequency is extracted from the time-frequency spectrum. According to the vibration frequency, the amplitude and phase of the frequency response function of each measuring point are extracted to obtain the vibration mode of each measuring point. A safety assessment of the rail expansion and contraction adjuster is performed based on the dynamic vibration displacement information of each measuring point, and a performance assessment of the rail expansion and contraction adjuster is performed based on the vibration mode of each measuring point. This can avoid the driving risks caused by the installation and commissioning of contact equipment, can monitor the full displacement data of the rail expansion and contraction adjuster in real time, and more accurately evaluate the working performance of the rail expansion and contraction adjuster.

Description

Technical Field

[0001] The present invention relates to the field of railway track technology, and in particular to an evaluation method, device, equipment and storage medium for a rail expansion adjuster. Background Art

[0002] Traditional rail expansion and contraction adjusters adopt a skylight maintenance model. With the rapid development of my country's rail transit, this maintenance method is obviously unable to monitor the dynamic displacement of the rail expansion and contraction adjusters in real time during normal train operation, and there are great risks in the operation process.

[0003] In order to obtain the dynamic displacement data of the rail expansion and contraction adjuster in real time in the existing technology, the dynamic displacement of the rail expansion and contraction adjuster is usually monitored by installing a fiber grating sensor and a displacement sensor on the rail, or by setting a reflective mark or spraying a displacement mark on the rail, and installing an image recognition device near the track for displacement monitoring. However, in actual applications, too many sensors will not only affect the working performance of the rail expansion and contraction adjuster, but also the risk of the sensor falling off, which is easy to endanger driving safety, and the non-contact monitoring scheme using machine vision is easily affected by external environments such as bad weather, light changes, and temperature fluctuations. In addition, the above two schemes only monitor the displacement extreme values ​​of the displacement data of the rail expansion and contraction adjuster to determine whether the adjuster is safe, and cannot monitor the working performance of the rail expansion and contraction adjuster, and cannot promptly detect defects such as damage to the adjuster structure. Therefore, there is an urgent need for a non-contact real-time monitoring and evaluation method for the working performance of the rail expansion and contraction adjuster. Summary of the invention

[0004] In view of this, the purpose of the present invention is to overcome the deficiency in the prior art that a rail expansion adjuster cannot be monitored and evaluated in real time, and to provide an evaluation method, device, electronic device and storage medium for a rail expansion adjuster.

[0005] The present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present disclosure provides a method for evaluating a rail expansion adjuster, the method comprising:

[0007] Collecting radar signals from each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point;

[0008] Performing short-time Fourier transformation on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum;

[0009] According to the vibration frequency, the amplitude and phase of the frequency response function of each measuring point are extracted to obtain the vibration mode of each measuring point;

[0010] A safety assessment of the rail expansion and contraction adjuster is performed based on the dynamic vibration displacement information of each of the measuring points, and a performance assessment of the rail expansion and contraction adjuster is performed based on the vibration mode of each of the measuring points.

[0011] According to a specific implementation method disclosed in the present application, the step of collecting radar signals at each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point includes:

[0012] Install a lateral radar and a bottom radar on the side and bottom of each measuring point to collect radar signals of each measuring point;

[0013] Obtaining lateral radar data and bottom radar data of each measuring point according to the radar signal using an interference displacement calculation method based on FMCW radar, and fusing the lateral radar data and the bottom radar data to determine dynamic vibration displacement data;

[0014] The dynamic vibration displacement data of each measuring point are cleaned and preprocessed to obtain the dynamic vibration displacement information of each measuring point.

[0015] According to a specific implementation method disclosed in the present application, the step of obtaining the dynamic vibration displacement data of each measuring point according to the radar signal based on the interference displacement calculation method of the FMCW radar includes:

[0016] Using the transmitted signal calculation formula The transmission signal of each measuring point is obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, is the signal time;

[0017] Using the echo signal calculation formula The echo signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time;

[0018] Using the mixed signal calculation formula The mixed frequency signals of each measuring point are obtained, wherein: is the signal time;

[0019] Using the low-pass filter calculation formula The difference frequency signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time;

[0020] Based on coherent processing and phase information calculation formula The dynamic vibration displacement data of each measuring point is obtained, wherein: is the wavelength, is the phase change, is the signal time.

[0021] According to a specific implementation method disclosed in the present application, the steps of performing short-time Fourier transform on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum include:

[0022] Using the short-time Fourier transform formula The time-frequency spectrum of each dynamic vibration displacement information is obtained, wherein: is the time-frequency spectrum of each of the dynamic vibration displacement information, is the original signal, is the window function, For time, is the frequency, j is an imaginary number, is the time differential;

[0023] Using the ridge extraction formula The vibration frequency is extracted from the time-frequency spectrum, wherein For each time point On, frequency The local maximum at .

[0024] According to a specific implementation manner disclosed in the present application, the step of extracting the amplitude and phase of the frequency response function of each measuring point according to the vibration frequency to obtain the vibration mode of each measuring point includes:

[0025] Calculate the frequency response function value of each measuring point according to the vibration frequency;

[0026] The frequency response function amplitude and phase of each measuring point at the same time are extracted by a timestamp method, and the vibration mode formed by the combination of each measuring point is constructed according to the frequency response function amplitude and phase of each measuring point at the same time.

[0027] According to a specific implementation method disclosed in the present application, the step of performing safety assessment on the rail expansion adjuster according to the dynamic vibration displacement information of each measuring point includes:

[0028] Evaluating the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each measuring point and a first preset threshold value;

[0029] If the dynamic vibration displacement information of all the measuring points is less than or equal to the first preset threshold, the rail expansion adjuster is evaluated to be safe;

[0030] If the dynamic vibration displacement information of all the measuring points is greater than the first preset threshold, it is evaluated that the rail expansion adjuster is unsafe.

[0031] According to a specific implementation method disclosed in the present application, the step of evaluating the performance of the rail expansion adjuster according to the vibration mode of each measuring point includes:

[0032] Obtaining dynamic performance modal parameters according to the vibration mode;

[0033] Evaluating the rail expansion and contraction adjuster according to the dynamic performance modal parameter and a second preset threshold;

[0034] If the dynamic performance modal parameter is less than or equal to the second preset threshold, it is evaluated that the rail expansion adjuster is not damaged;

[0035] If the dynamic performance modal parameter is greater than the second preset threshold, it is evaluated that the performance of the rail expansion adjuster is damaged;

[0036] If the rail expansion and contraction adjuster is damaged, the damage of the rail expansion and contraction adjuster is located by using the modal strain energy method and the modal frequency change method, and the damage degree of the rail expansion and contraction adjuster is determined according to the change of the dynamic performance modal parameters;

[0037] According to the rail force calculation formula The rail force of the rail expansion regulator is calculated, and the performance of the rail expansion regulator is evaluated according to the rail force, wherein: is the elastic modulus of steel, is the moment of inertia of the rail section, is the characteristic value, is the natural frequency of the mode, is the density of steel, is the cross-sectional area of ​​the rail.

[0038] In a second aspect, an embodiment of the present disclosure provides an evaluation device for a rail expansion adjuster, the device comprising:

[0039] An acquisition module is used to acquire radar signals of each measuring point, perform signal demodulation processing on each radar signal, and obtain dynamic vibration displacement information of each measuring point;

[0040] A transformation module, used for performing short-time Fourier transformation on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum;

[0041] An extraction module, used to extract the amplitude and phase of the frequency response function of each measuring point according to the vibration frequency, and obtain the vibration mode of each measuring point;

[0042] An evaluation module is used to perform a safety evaluation on the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each of the measuring points, and to perform a performance evaluation on the rail expansion and contraction adjuster according to the vibration mode of each of the measuring points.

[0043] In a third aspect, an electronic device is provided in an embodiment of the present disclosure, the electronic device comprising a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the rail expansion adjuster evaluation method described in any one of the first aspects when executing the computer program.

[0044] In a fourth aspect, a computer-readable storage medium is provided in an embodiment of the present disclosure, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for evaluating a rail expansion adjuster described in any one of the first aspects are implemented.

[0045] The evaluation method of the rail expansion and contraction regulator provided by the present application above acquires radar signals from each measuring point, performs signal demodulation processing on each radar signal, and obtains dynamic vibration displacement information of each measuring point. Perform short-time Fourier transform on each dynamic vibration displacement information to obtain a time-frequency spectrum of each dynamic vibration displacement information, and extract the vibration frequency from the time-frequency spectrum. According to the vibration frequency, extract the amplitude and phase of the frequency response function of each measuring point to obtain the vibration mode of each measuring point. Perform safety evaluation on the rail expansion and contraction regulator according to the dynamic vibration displacement information of each measuring point, and perform performance evaluation on the rail expansion and contraction regulator according to the vibration mode of each measuring point. By acquiring radar signals from each measuring point to evaluate the performance of the rail expansion and contraction regulator, the driving risks brought by the installation and commissioning of contact equipment can be avoided. By acquiring dynamic vibration displacement information from each measuring point, the full displacement data of the rail expansion and contraction regulator can be monitored in real time, and the working performance of the rail expansion and contraction regulator can be evaluated more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In each of the drawings, similar components are numbered similarly.

[0047] Figure 1A schematic flow chart of a method for evaluating a rail expansion adjuster provided in an embodiment of the present application is shown;

[0048] Figure 2 A schematic diagram of a performance evaluation process of a rail expansion adjuster provided in an embodiment of the present application is shown;

[0049] Figure 3 A schematic structural diagram of an evaluation device for a rail expansion adjuster provided in an embodiment of the present application is shown;

[0050] Figure 4 Shows Figure 3 A top view of the system arrangement of the evaluation device of the rail expansion adjuster;

[0051] Figure 5 Shows Figure 3 Front view of the system arrangement of the evaluation device of the rail expansion adjuster. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, 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, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0057] Example 1

[0058] like Figure 1 , which is a flow chart of an evaluation method for a rail expansion regulator in an embodiment of the present application, and the evaluation method for a rail expansion regulator provided in an embodiment of the present application comprises the following steps:

[0059] Step S101 , collecting radar signals of each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point.

[0060] Specifically, the rail expansion regulator is a device that adjusts the expansion and contraction of the rail. The rail expansion regulator is installed on the track, and the expansion and contraction of the track can be adjusted by the relative displacement of the point rail or the base rail. When the train passes over the rail, it is inevitable that the rail will be displaced and damaged. During the operation of the train, the normal use of the rail must be ensured at all times. Therefore, real-time monitoring and evaluation of the rail expansion regulator is particularly important.

[0061] Specifically, the radar includes a receiving antenna, a transmitting antenna, a transmitter, a receiver, a signal processor and a power supply unit. The transmitter is responsible for generating a transmission signal in the frequency band of 30GHz to 300GHz. Its core components include a baseband signal generator, a radio frequency source, an up-converter, a radio frequency filter and a power amplifier. The baseband signal generator uses DDS technology and can generate a linear frequency modulation signal with a maximum modulation bandwidth of 300MHz, a center frequency of 250MHz, and a spectrum range of 100MHz to 400MHz. The signal is mixed with a 24GHz radio frequency source signal, amplified after radio frequency filtering, and outputs a 1W power signal. The 7dBm signal is sent to the receiver through a directional coupler as a mixed local oscillator signal, and the main power signal is sent to the transmitting antenna.

[0062] The receiver consists of a mixer, a zero intermediate frequency amplifier, an AD converter, a signal processor, and a data processor. The mixer uses a single-chip mixer. The local oscillator signal is provided by the transmitter and mixed with the echo signal received by the receiving antenna to generate an orthogonal and in-phase dual-channel zero intermediate frequency signal. After filtering and amplification, the signal is transmitted to the dual-channel AD converter, converted into discrete echo sampling data, and finally sent to the signal processor for processing. The processor is mainly composed of DSP and FPGA.

[0063] The step of collecting radar signals from each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point includes:

[0064] Install a lateral radar and a bottom radar on the side and bottom of each measuring point to collect radar signals of each measuring point;

[0065] Obtaining lateral radar data and bottom radar data of each measuring point according to the radar signal using an interference displacement calculation method based on FMCW radar, and fusing the lateral radar data and the bottom radar data to determine dynamic vibration displacement data;

[0066] The dynamic vibration displacement data of each measuring point are cleaned and preprocessed to obtain the dynamic vibration displacement information of each measuring point.

[0067] Specifically, dynamic vibration displacement information refers to the vertical and lateral displacement of the rail expansion adjuster caused by the train passing over the rail. Each radar signal is transmitted by wire or wireless means. The wired method can be transmitted through media such as coaxial cables or optical fibers. This method has the characteristics of high stability and strong anti-interference ability, and is suitable for practical applications with short distances. The wireless method can be transmitted through radio waves, such as Wifi and Zifeng protocols, which are suitable for long-distance transmission in complex environments.

[0068] It can be understood that by installing lateral radars and bottom radars on the sides and bottom of each measuring point respectively, it is possible to collect all-round vibration displacement data of the rail expansion and contraction adjuster, thereby ensuring the accuracy of the vibration displacement data. By adopting high-frequency signal collection, it is possible to capture real-time dynamic changes in the radar signals of each measuring point, thereby improving the timeliness and accuracy of subsequent evaluations.

[0069] Specifically, the data cleaning and preprocessing of the dynamic vibration displacement data of each measuring point include denoising, detrending and normalization. Random noise is removed by using smoothing filtering or Kalman filtering, and linear or nonlinear trends in the signal are removed by using polynomial fitting and other methods, thus ensuring the stability and accuracy of the data. At the same time, the signal is normalized to a preset range for subsequent analysis.

[0070] The step of obtaining the dynamic vibration displacement data of each measuring point according to the radar signal based on the interference displacement calculation method of the FMCW radar comprises:

[0071] Using the transmitted signal calculation formula The transmission signal of each measuring point is obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, is the signal time;

[0072] Using the echo signal calculation formula The echo signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time;

[0073] Using the mixed signal calculation formula The mixed frequency signals of each measuring point are obtained, wherein: is the signal time;

[0074] Using the low-pass filter calculation formula The difference frequency signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time;

[0075] Based on coherent processing and phase information calculation formula The dynamic vibration displacement data of each measuring point is obtained, wherein: is the wavelength, is the phase change, is the signal time.

[0076] Specifically, FMCW (Frequency Modulated Continuous Wave) radar transmits a linear frequency modulated signal, whose frequency changes linearly with time. The radar's transmitting signal can be obtained through the transmitting signal calculation formula. The radar receives the echo signal reflected by the target, whose frequency is time delayed with the transmitting signal. The transmitting signal and the echo signal are mixed to obtain a mixed signal. The mixed signal is processed by a low-pass filter to obtain a difference frequency signal, and finally the dynamic vibration displacement data of each measuring point is calculated.

[0077] Step S102 , performing short-time Fourier transform on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum.

[0078] Specifically, short-time Fourier transform is a time-frequency analysis method that segments the signal and performs Fourier transform on each segment to obtain the representation of the signal in the time-frequency domain. The time-frequency spectrum is obtained by calculating the frequency components of the dynamic displacement information of the rail expansion adjuster at different time points, thereby reflecting the changes in the dynamic vibration displacement information of the rail expansion adjuster over time.

[0079] The step of performing short-time Fourier transform on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum comprises:

[0080] Using the short-time Fourier transform formula The time-frequency spectrum of each dynamic vibration displacement information is obtained, wherein: is the time-frequency spectrum of each of the dynamic vibration displacement information, is the original signal, is the window function, For time, is the frequency, j is an imaginary number, is the time differential;

[0081] Using the ridge extraction formula The vibration frequency is extracted from the time-frequency spectrum, wherein For each time point On, frequency The local maximum at .

[0082] Specifically, by using window functions such as Hanning window, Hamming window and rectangular window to perform signal segmentation processing, spectrum leakage is reduced. By using short-time Fourier transform to achieve time-frequency analysis, it can better reflect the change of dynamic vibration displacement information over time.

[0083] Obviously, the ridge extraction formula is used to extract the main frequency components from the time-frequency spectrum. The ridge represents the trajectory of the local maximum in the time-frequency spectrum and can reflect the main vibration frequency of the dynamic vibration displacement information.

[0084] Step S103: extracting the amplitude and phase of the frequency response function of each of the measuring points according to the vibration frequency, and obtaining the vibration mode of each of the measuring points.

[0085] The step of extracting the amplitude and phase of the frequency response function of each measuring point according to the vibration frequency to obtain the vibration mode of each measuring point includes:

[0086] Calculate the frequency response function value of each measuring point according to the vibration frequency;

[0087] The frequency response function amplitude and phase of each measuring point at the same time are extracted by a timestamp method, and the vibration mode formed by the combination of each measuring point is constructed according to the frequency response function amplitude and phase of each measuring point at the same time.

[0088] Specifically, for each vibration frequency, the frequency response function value of each measuring point is calculated. For a certain measuring point, the frequency response function is defined as is the ratio of rail displacement response to rail force in the frequency domain. Extract the frequency response function amplitude of each measuring point and Phase ,in, ,in, is the location of the measuring point, For the The first mode is at position The amplitude at is the corresponding phase angle, and the mode shape can be expressed as a function of the amplitude and phase at the measurement point ,in, For the The first mode at the measuring point The complex number representation at contains amplitude and phase information, forming the vibration mode.

[0089] It can be understood that by using the timestamp method to assign a time scale to the dynamic vibration displacement information of each measuring point, the dynamic vibration displacement information of each measuring point can be accurately synchronized. A 13-digit timestamp can be used to encode the timestamp and store it in the displacement signal of the rail expansion regulator to form a data structure. The first ten digits of the timestamp code save the total number of seconds from Greenwich Mean Time (00:00:00 GMT) on January 1, 1970 to the current time, and the last three digits save the exact number of milliseconds. When in use, the timestamp is converted into time by the division remainder calculation method.

[0090] Step S104, performing a safety assessment on the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each of the measuring points, and performing a performance assessment on the rail expansion and contraction adjuster according to the vibration mode of each of the measuring points.

[0091] The step of performing safety assessment on the rail expansion adjuster according to the dynamic vibration displacement information of each measuring point comprises:

[0092] Evaluating the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each measuring point and a first preset threshold value;

[0093] If the dynamic vibration displacement information of all the measuring points is less than or equal to the first preset threshold, the rail expansion adjuster is evaluated to be safe;

[0094] If the dynamic vibration displacement information of all the measuring points is greater than the first preset threshold, it is evaluated that the rail expansion adjuster is unsafe.

[0095] See also Figure 2 , Figure 2 A schematic diagram of a performance evaluation process of a rail expansion regulator provided in an embodiment of the present application, wherein the step of evaluating the performance of the rail expansion regulator according to the vibration mode of each measuring point comprises:

[0096] Step S201, obtaining dynamic performance modal parameters according to the vibration mode;

[0097] Step S202, evaluating the rail expansion regulator according to the dynamic performance modal parameter and a second preset threshold;

[0098] Step S203, if the dynamic performance modal parameter is less than or equal to the second preset threshold, it is evaluated that the rail expansion adjuster is not damaged;

[0099] Step S204, if the dynamic performance modal parameter is greater than the second preset threshold, it is evaluated that the performance of the rail expansion adjuster is damaged;

[0100] Step S205: if the rail expansion regulator is damaged, the damage of the rail expansion regulator is located by using the modal strain energy method and the modal frequency change method, and the damage degree of the rail expansion regulator is determined according to the dynamic performance modal parameters;

[0101] Step S206, according to the rail force calculation formula The rail force of the rail expansion regulator is calculated, and the performance of the rail expansion regulator is evaluated according to the rail force, wherein: is the elastic modulus of steel, is the moment of inertia of the rail section, is the characteristic value, is the natural frequency of the mode, is the density of steel, is the cross-sectional area of ​​the rail.

[0102] Specifically, the rail is assumed to be a beam model with continuous elastic support, and the vibration equation is: ,in, is the axial force in the rail, For the rail in position Place, time The lateral displacement, is the partial differential, is the elastic modulus of steel, is the moment of inertia of the rail section, is the elastic support stiffness per unit length, is the density of steel, is the cross-sectional area of ​​the rail, the rail boundary is assumed to be a fixed beam at both ends, and the general solution is brought into the boundary condition , and get, ,in, , is the eigenvalue obtained by numerical calculation, is the characteristic equation value, which shows that the natural frequency With internal force There is a direct relationship between the magnitude of the internal force and the natural frequency. Increase, natural frequency will decrease, such as internal force is the tension, the natural frequency When the natural frequency is measured , the rail force can be obtained by the rail force calculation formula. The dynamic performance modal parameter is a preset first threshold value that can be set according to the design specifications of the rail expansion adjuster and relevant industry specifications and regulations. The preset second threshold value includes a vibration frequency change threshold value and a vibration mode change threshold value. By obtaining the dynamic vibration displacement information of each measuring point and analyzing it with the preset first threshold value, the full range of displacement of the rail expansion adjuster can be intuitively obtained. At the same time, the vibration frequency and vibration mode changes of each measuring point will change over time, and the change in vibration frequency can be based on Intuitively reflects the degree of damage, among which, refers to the change in vibration frequency. Refers to the change threshold of vibration frequency. The vibration mode change can be based on It directly reflects the degree of damage, among which, It refers to the change of vibration mode. It refers to the threshold value of vibration mode change. The damage is located and evaluated by using the modal strain energy method or the modal frequency change method. The location and extent of the damage can be determined by comparing the vibration frequency and vibration mode changes before and after the damage.

[0103] The evaluation method of the rail expansion and contraction regulator provided in the embodiment of the present application collects radar signals from each measuring point, performs signal demodulation processing on each radar signal, and obtains dynamic vibration displacement information of each measuring point. Performs short-time Fourier transform on each dynamic vibration displacement information to obtain a time-frequency spectrum of each dynamic vibration displacement information, and extracts the vibration frequency from the time-frequency spectrum. According to the vibration frequency, extracts the amplitude and phase of the frequency response function of each measuring point to obtain the vibration mode of each measuring point. Performs a safety evaluation on the rail expansion and contraction regulator according to the dynamic vibration displacement information of each measuring point, and performs a performance evaluation on the rail expansion and contraction regulator according to the vibration mode of each measuring point. By collecting radar signals from each measuring point to evaluate the performance of the rail expansion and contraction regulator, the driving risks caused by the installation and commissioning of contact equipment can be avoided. By collecting dynamic vibration displacement information from each measuring point, the full displacement data of the rail expansion and contraction regulator can be monitored in real time, and the working performance of the rail expansion and contraction regulator can be evaluated more accurately.

[0104] Example 2

[0105] like Figure 3 FIG. 1 is a schematic diagram of a structure of an evaluation device 300 for a rail expansion adjuster in an embodiment of the present application, and the device includes:

[0106] The acquisition module 301 is used to acquire radar signals of each measuring point, perform signal demodulation processing on each radar signal, and obtain dynamic vibration displacement information of each measuring point;

[0107] A transformation module 302 is used to perform short-time Fourier transformation on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extract the vibration frequency from the time-frequency spectrum;

[0108] An extraction module 303 is used to extract the frequency response function amplitude and phase of each of the measuring points according to the vibration frequency, and obtain the vibration mode of each of the measuring points;

[0109] The evaluation module 304 is used to perform a safety evaluation on the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each of the measuring points, and to perform a performance evaluation on the rail expansion and contraction adjuster according to the vibration mode of each of the measuring points.

[0110] Specifically, please refer to Figure 4 and Figure 5 The rail expansion and contraction adjuster includes a telescopic rail and a sleeper (ballast bed). A plurality of sleepers are arranged at intervals along the extension direction of the telescopic rail. The telescopic rail is laid on the sleepers, and an installation gap is arranged below the telescopic rail between two adjacent sleepers.

[0111] Specifically, the acquisition module includes a lateral acquisition radar and a bottom acquisition radar. The bottom acquisition radar is arranged in the installation gap for detecting from the bottom of the telescopic track, and the bottom acquisition radar is used to detect the vertical displacement change of the telescopic track; the lateral acquisition radar is arranged on one side of the telescopic track for detecting from the side of the telescopic track, and the lateral acquisition radar is used to detect the lateral horizontal displacement change of the telescopic track; wherein, the telescopic track has multiple measuring points, and the lateral acquisition radar and the bottom acquisition radar are respectively arranged in one-to-one correspondence with the measuring points of the telescopic track.

[0112] The evaluation device for the rail expansion and contraction regulator provided in the embodiment of the present application collects radar signals from each measuring point, performs signal demodulation processing on each radar signal, and obtains dynamic vibration displacement information of each measuring point. Performs short-time Fourier transform on each dynamic vibration displacement information to obtain a time-frequency spectrum of each dynamic vibration displacement information, and extracts the vibration frequency from the time-frequency spectrum. According to the vibration frequency, extracts the amplitude and phase of the frequency response function of each measuring point to obtain the vibration mode of each measuring point. Performs safety evaluation on the rail expansion and contraction regulator according to the dynamic vibration displacement information of each measuring point, and performs performance evaluation on the rail expansion and contraction regulator according to the vibration mode of each measuring point. By collecting radar signals from each measuring point to evaluate the performance of the rail expansion and contraction regulator, the driving risks caused by the installation and commissioning of contact equipment can be avoided. By collecting dynamic vibration displacement information from each measuring point, the full displacement data of the rail expansion and contraction regulator can be monitored in real time, and the working performance of the rail expansion and contraction regulator can be evaluated more accurately.

[0113] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow chart, and the combination of boxes in the structure diagram and / or the flow chart, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0114] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0115] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0116] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for evaluating a rail expansion adjuster, characterized in that: The method comprises: Collecting radar signals from each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point; Performing short-time Fourier transformation on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum; According to the vibration frequency, the amplitude and phase of the frequency response function of each measuring point are extracted to obtain the vibration mode of each measuring point; Performing a safety assessment on the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each measuring point, and performing a performance assessment on the rail expansion and contraction adjuster according to the vibration mode of each measuring point; Obtaining dynamic performance modal parameters according to the vibration mode; Evaluating the rail expansion and contraction adjuster according to the dynamic performance modal parameter and a second preset threshold; If the dynamic performance modal parameter is less than or equal to the second preset threshold, it is evaluated that the rail expansion adjuster is not damaged; If the dynamic performance modal parameter is greater than the second preset threshold, it is evaluated that the performance of the rail expansion adjuster is damaged; If the rail expansion and contraction adjuster is damaged, the damage of the rail expansion and contraction adjuster is located by using the modal strain energy method and the modal frequency change method, and the damage degree of the rail expansion and contraction adjuster is determined according to the change of the dynamic performance modal parameters; According to the rail force calculation formula The rail force of the rail expansion regulator is calculated, and the performance of the rail expansion regulator is evaluated according to the rail force, wherein: is the elastic modulus of steel, is the moment of inertia of the rail section, is the characteristic value, is the natural frequency of the mode, is the density of steel, is the cross-sectional area of ​​the rail.

2. The evaluation method of the rail expansion adjuster according to claim 1, characterized in that: The step of collecting radar signals from each measuring point, performing signal demodulation processing on each radar signal, and obtaining dynamic vibration displacement information of each measuring point includes: Install a lateral radar and a bottom radar on the side and bottom of each measuring point to collect radar signals of each measuring point; Obtaining lateral radar data and bottom radar data of each measuring point according to the radar signal using an interference displacement calculation method based on FMCW radar, and fusing the lateral radar data and the bottom radar data to determine dynamic vibration displacement data; The dynamic vibration displacement data of each measuring point are cleaned and preprocessed to obtain the dynamic vibration displacement information of each measuring point.

3. The evaluation method of the rail expansion adjuster according to claim 2, characterized in that: The step of obtaining the dynamic vibration displacement data of each measuring point according to the radar signal based on the interference displacement calculation method of the FMCW radar comprises: Using the transmitted signal calculation formula The transmission signal of each measuring point is obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, is the signal time; Using the echo signal calculation formula The echo signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time; Using the mixed signal calculation formula The mixed frequency signals of each measuring point are obtained, wherein: is the signal time; Using the low-pass filter calculation formula The difference frequency signals of each measuring point are obtained, wherein: is the signal amplitude, is the starting frequency, is the frequency modulation slope, For time delay, is the signal time; Based on coherent processing and phase information calculation formula The dynamic vibration displacement data of each measuring point is obtained, wherein: is the wavelength, is the phase change.

4. The evaluation method of the rail expansion adjuster according to claim 1, characterized in that: The step of performing short-time Fourier transform on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum comprises: Using the short-time Fourier transform formula The time-frequency spectrum of each dynamic vibration displacement information is obtained, wherein: is the time-frequency spectrum of each of the dynamic vibration displacement information, is the original signal, is the window function, For time, is the frequency, j is an imaginary number, For time delay, is the time differential; Using the ridge extraction formula The vibration frequency is extracted from the time-frequency spectrum, wherein For each time point On, frequency The local maximum at .

5. The evaluation method of rail expansion adjuster according to claim 1, characterized in that: The step of extracting the amplitude and phase of the frequency response function of each measuring point according to the vibration frequency to obtain the vibration mode of each measuring point includes: Calculate the frequency response function value of each measuring point according to the vibration frequency; The frequency response function amplitude and phase of each measuring point at the same time are extracted by a timestamp method, and the vibration mode formed by the combination of each measuring point is constructed according to the frequency response function amplitude and phase of each measuring point at the same time.

6. The evaluation method of rail expansion adjuster according to claim 1, characterized in that: The step of performing safety assessment on the rail expansion adjuster according to the dynamic vibration displacement information of each measuring point comprises: Evaluating the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each measuring point and a first preset threshold value; If the dynamic vibration displacement information of all the measuring points is less than or equal to the first preset threshold, the rail expansion adjuster is evaluated to be safe; If the dynamic vibration displacement information of all the measuring points is greater than the first preset threshold, it is evaluated that the rail expansion adjuster is unsafe.

7. An evaluation device for a rail expansion adjuster, characterized in that: The device comprises: An acquisition module is used to acquire radar signals of each measuring point, perform signal demodulation processing on each radar signal, and obtain dynamic vibration displacement information of each measuring point; A transformation module, used for performing short-time Fourier transformation on each of the dynamic vibration displacement information to obtain a time-frequency spectrum of each of the dynamic vibration displacement information, and extracting the vibration frequency from the time-frequency spectrum; An extraction module, used to extract the amplitude and phase of the frequency response function of each measuring point according to the vibration frequency, and obtain the vibration mode of each measuring point; An evaluation module, used to perform a safety evaluation on the rail expansion and contraction adjuster according to the dynamic vibration displacement information of each of the measuring points, and to perform a performance evaluation on the rail expansion and contraction adjuster according to the vibration mode of each of the measuring points; Obtaining dynamic performance modal parameters according to the vibration mode; Evaluating the rail expansion and contraction adjuster according to the dynamic performance modal parameter and a second preset threshold; If the dynamic performance modal parameter is less than or equal to the second preset threshold, it is evaluated that the rail expansion adjuster is not damaged; If the dynamic performance modal parameter is greater than the second preset threshold, it is evaluated that the performance of the rail expansion adjuster is damaged; If the rail expansion and contraction adjuster is damaged, the damage of the rail expansion and contraction adjuster is located by using the modal strain energy method and the modal frequency change method, and the damage degree of the rail expansion and contraction adjuster is determined according to the change of the dynamic performance modal parameters; According to the rail force calculation formula The rail force of the rail expansion regulator is calculated, and the performance of the rail expansion regulator is evaluated according to the rail force, wherein: is the elastic modulus of steel, is the moment of inertia of the rail section, is the characteristic value, is the natural frequency of the mode, is the density of steel, is the cross-sectional area of ​​the rail.

8. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the evaluation method of the rail expansion adjuster according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for evaluating a rail expansion adjuster according to any one of claims 1 to 6 are implemented.

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