Cable strut vibration main frequency identification method and device and terminal equipment

Abstract

The invention relates to a cable strut vibration main frequency identification method and device and terminal equipment, and the method comprises the steps: obtaining a spectrogram of cable strut vibration and the estimated main frequency of each order, and extracting the peak frequency and the spectrum peak of each peak point from a curve of the spectrogram according to a neighborhood interval to obtain a spectrum number set of each order; according to the estimated main frequency of each order, the peak frequency in the frequency spectrum number set and the frequency spectrum peak value, calculating to obtain a frequency overlap ratio; the peak frequency corresponding to the maximum frequency overlap ratio value is screened out from the frequency spectrum number set to serve as the main frequency of the order; performing correlation analysis on all the main frequencies of each order to obtain correlation coefficients; and determining the identification main frequency of each order of vibration of the cable rod according to the correlation coefficient. According to the method, the frequency overlap ratio is obtained by pre-estimating the main frequency, the peak frequency and the frequency spectrum peak value, the main frequency of the corresponding order is determined according to all the frequency overlap ratios of each order, then whether all the obtained main frequencies can serve as the identification main frequency of the vibration of each order of the cable strut is judged, and identification of the main frequency of the vibration of the cable strut is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of cable rod identification, and in particular to a method, device and terminal equipment for identifying the main frequency of cable rod vibration. Background Art

[0002] Cable-stayed structure is a common form of building structure, which uses cables (or cable rods) suspended from fulcrums to support the gravity of the building, forming a unique appearance and function. Identifying the main frequency is the most basic work to infer the tension of the cable rod, which has a great impact on the analysis results.

[0003] When testing the peak value of the cable rod vibration in a natural environment, it is often disturbed by various factors (such as the environment), which affects the test results. In particular, in certain frequency ranges, the spectrum of the cable rod vibration will have multiple dense peaks, making it difficult to determine which is the main vibration frequency of the cable rod. For example, in the low frequency band, the low-order main frequency is mixed with the environmental vibration, and the peak value of the main frequency is not obvious. Summary of the invention

[0004] The present application provides a method, device and terminal device for identifying the main frequency of cable rod vibration, which are used to solve the technical problem that the existing method for identifying the main frequency of the cable rod is difficult to identify.

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

[0006] On the one hand, a method for identifying the main frequency of cable rod vibration is provided, comprising the following steps:

[0007] Obtaining a frequency spectrum diagram of the cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and the spectrum peak of each peak point from the curve of the frequency spectrum diagram according to the neighborhood interval, and obtaining a frequency spectrum number set of each order;

[0008] According to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, the frequency coincidence corresponding to each peak point in the spectrum set is obtained; the peak frequency corresponding to the maximum value of the frequency coincidence is selected from the spectrum set as the main frequency of the order;

[0009] A correlation analysis is performed on all the main frequencies of each order to obtain a correlation coefficient; and based on the correlation coefficient, it is determined whether all the main frequencies are the identified main frequencies of the cable rod vibrations of each order.

[0010] Preferably, performing correlation analysis on all the main frequencies of each order to obtain the correlation coefficient includes: drawing a curve graph according to the order of vibration frequencies of each order and the main frequencies corresponding to each order, and performing correlation analysis on the curve graph using a least squares curve fitting method to obtain the correlation coefficient.

[0011] Preferably, judging whether all the main frequencies are the identified main frequencies of the cable rod vibrations of various orders according to the correlation coefficient comprises:

[0012] If the correlation coefficient is greater than the coefficient threshold, all the main frequencies are used as the identified main frequencies of each order of vibration of the cable rod;

[0013] If the correlation coefficient is not greater than the coefficient threshold, the main frequencies corresponding to the large deviations from the fitting line are eliminated from the fitting line obtained by fitting the curve graph using the least square curve fitting method until the obtained correlation coefficient is greater than the coefficient threshold, and all the remaining main frequencies are used as the identified main frequencies of the corresponding vibrations of each order of the cable rod;

[0014] The number of the eliminated main frequencies does not exceed one fifth of the total number of all the main frequencies.

[0015] Preferably, the main frequency identification method of the cable rod vibration comprises: using the coincidence formula to calculate the frequency coincidence corresponding to each peak point in the spectrum set according to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: , k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, P k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, F k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

[0016] Preferably, obtaining the estimated main frequency of each order vibration of the cable rod includes:

[0017] Acquire design parameters of the cable rod, and calculate the initial frequencies of each order of vibration of the cable rod according to the design parameters; the design parameters include bending stiffness of the cable of the cable rod, cable length, cable line density and tension;

[0018] Constructing a continuous and uninterrupted first frequency curve according to all the peak frequencies and the spectrum peaks, and constructing a second frequency curve according to the order of vibration frequencies of each order and the corresponding initial frequency;

[0019] Determining whether the initial frequency of each order and the spectrum number set satisfy a constraint condition or whether the first frequency curve and the second frequency curve satisfy a constraint condition; determining whether the initial frequency is used as the estimated main frequency of the corresponding order;

[0020] The constraint conditions include: the difference between the initial frequency and each peak frequency in the frequency spectrum set is less than a set frequency threshold; or the first frequency curve overlaps with the second frequency curve.

[0021] Preferably, obtaining the estimated main frequency of each order vibration of the cable rod includes: if the constraint condition is not satisfied, adjusting the tension of the design parameter until the calculated initial frequency satisfies the constraint condition, and obtaining the calculated initial frequency as the estimated main frequency of the order.

[0022] Preferably, obtaining the spectrum diagram of the cable rod vibration comprises: collecting vibration signals of various orders by a signal collection element arranged at a middle position of the cable rod; and processing the vibration signals of various orders by Fourier transform to obtain the spectrum diagram of the cable rod vibration.

[0023] In another aspect, a device for identifying the main frequency of cable rod vibration is provided, comprising a data acquisition module, a calculation and screening module, and an identification and judgment module;

[0024] The data acquisition module is used to obtain the spectrum diagram of the cable rod vibration and the estimated main frequency of each order, extract the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtain the spectrum data set of each order;

[0025] The calculation and screening module is used to calculate, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, to obtain the frequency coincidence corresponding to each peak point in the spectrum set; and screen out the peak frequency corresponding to the maximum frequency coincidence value from the spectrum set as the main frequency of the order;

[0026] The identification and judgment module is used to perform correlation analysis on all the main frequencies of each order to obtain correlation coefficients; and judge whether all the main frequencies are the identified main frequencies of each order vibration of the cable rod according to the correlation coefficients.

[0027] Preferably, the calculation and screening module is further used to calculate the frequency coincidence corresponding to each peak point in the spectrum set by using a coincidence formula according to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: , k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, P k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, F k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

[0028] In another aspect, a terminal device is provided, comprising a processor and a memory;

[0029] The memory is used to store program codes and transmit the program codes to the processor;

[0030] The processor is used to execute the above-mentioned cable rod vibration main frequency identification method according to the instructions in the program code.

[0031] The main frequency identification method, device and terminal equipment of cable rod vibration include obtaining a spectrum diagram of cable rod vibration and an estimated main frequency of each order, extracting the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtaining a spectrum number set of each order; calculating the frequency coincidence corresponding to each peak point in the spectrum number set according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum number set; selecting the peak frequency corresponding to the maximum frequency coincidence value from the spectrum number set as the main frequency of the order; performing correlation analysis on all the main frequencies of each order to obtain the correlation coefficient; judging whether all the main frequencies are the identification main frequencies of the vibration of the cable rod of each order according to the correlation coefficient.

[0032] It can be seen from the above technical scheme that the present application has the following advantages: the method for identifying the main frequency of cable rod vibration obtains the peak frequency and the spectrum peak by processing and analyzing the acquired spectrum diagram, obtains the frequency coincidence according to the estimated main frequency, peak frequency and spectrum peak, and determines the main frequency of the corresponding order according to all the frequency coincidences of each order, and then judges whether all the main frequencies obtained can be used as the identification main frequencies of each order of cable rod vibration, thereby realizing the identification of the main frequency of cable rod vibration; it solves the technical problem of the difficulty in identifying the main frequency of the existing method of identifying the main frequency of the cable rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0034] Figure 1 This is a flowchart of the steps of the method for identifying the main frequency of cable rod vibration described in an embodiment of the present application;

[0035] Figure 2 It is a curve diagram of the frequency spectrum diagram in the method for identifying the main frequency of cable rod vibration described in an embodiment of the present application;

[0036] Figure 3 It is a spectrum peak diagram extracted from a spectrum diagram in the method for identifying the main frequency of cable rod vibration described in an embodiment of the present application;

[0037] Figure 4 A first frequency curve diagram of the cable rod vibration main frequency identification method described in an embodiment of the present application;

[0038] Figure 5 It is a schematic diagram of the framework of the cable rod vibration main frequency identification device according to the embodiment of the present application;

[0039] Figure 6 A schematic diagram of a terminal device described in an embodiment of the present application. DETAILED DESCRIPTION

[0040] 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 them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, 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 "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] In the embodiments of the present application, 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 one; 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 those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0043] The embodiments of the present application provide a method, an apparatus and a terminal device for identifying the main frequency of cable rod vibration, which solve the technical problem that the existing method for identifying the main frequency of the cable rod is difficult to identify.

[0044] Embodiment 1:

[0045] Figure 1 This is a flowchart of the steps of the method for identifying the main frequency of cable rod vibration described in an embodiment of the present application. Figure 2 is a curve diagram of the frequency spectrum diagram in the method for identifying the main frequency of cable rod vibration described in an embodiment of the present application, Figure 3 It is a spectrum peak diagram extracted from the spectrum diagram in the method for identifying the main frequency of cable-rod vibration described in an embodiment of the present application.

[0046] like Figure 1 As shown, the embodiment of the present application provides a method for identifying the main frequency of cable rod vibration, comprising the following steps:

[0047] S1. Obtain the spectrum diagram of the cable-rod vibration and the estimated main frequency of each order, extract the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtain the spectrum data set of each order.

[0048] It should be noted that in step S1, the first step is to obtain the spectrum diagram of the cable rod vibration and the estimated main frequency of each order; the second step is to obtain the peak frequency and spectrum peak of each peak point according to the neighborhood interval from the curve of the spectrum diagram. In this embodiment, the neighborhood interval can be selected as 1Hz. The neighborhood interval can also be set according to requirements. Figure 2 and Figure 3 As shown in the figure, the peak point of the curve refers to the point where the spectrum value of the peak point is greater than the spectrum values ​​of its left and right adjacent spectrum values ​​in the neighborhood interval. It can be understood that the point where the spectrum value is the largest in the neighborhood interval is the peak point. Among them, the spectrum peak value in the spectrum data set is recorded as P k , the peak frequency in the spectrum data set is recorded as F k , k=1, 2, 3,...n, n is the total number of peak points on the curve, and can also represent the peak frequency and the total number of peak frequencies in the spectrum data set.

[0049] In an embodiment of the present application, the main frequency identification method of the cable-rod vibration extracts the peak frequency and spectrum peak value of each peak point from the curve of the spectrum diagram, and can infer and screen the peak points of each order based on the order design value or previous test results from the peak frequency and spectrum peak value of each extracted peak point, thereby obtaining a spectrum number set consisting of the peak frequencies and spectrum peak values ​​corresponding to all peak points of each order.

[0050] S2. Calculate the frequency coincidence corresponding to each peak point in the spectrum set based on the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum set; and select the peak frequency corresponding to the maximum frequency coincidence value from the spectrum set as the main frequency of the order.

[0051] It should be noted that in step S2, the frequency coincidence of each peak point in each order is calculated based on the data obtained in step S1, and then the frequency coincidence with the largest value is selected from the calculated frequency coincidence of all peak points in each order, and the peak frequency corresponding to the maximum frequency coincidence is taken as the main frequency of the corresponding order.

[0052] In the embodiment of the present application, the frequency coincidence corresponding to each peak point in the spectrum set is obtained by calculating the coincidence degree formula according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum set; the coincidence degree formula is: , k = 0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, F k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, P k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

[0053] S3. Perform correlation analysis on all main frequencies of each order to obtain correlation coefficients; and determine whether all main frequencies are identified main frequencies of each order vibration of the cable rod according to the correlation coefficients.

[0054] It should be noted that in step S3, a curve graph is drawn based on the main frequencies of all orders of the cable rod obtained in step S2 and the corresponding vibration frequency orders, and the correlation coefficient is obtained by analyzing the correlation of all main frequencies according to the curve graph. According to the correlation coefficient, it is judged whether the main frequencies of all orders obtained in step S2 can be used as the identification main frequencies of each order vibration of the cable rod.

[0055] In an embodiment of the present application, the cable rod vibration main frequency identification method obtains the main frequency of each order by analyzing the acquired spectrum diagram and the estimated main frequency, and then determines whether the obtained main frequency can be used as the identification main frequency of each order of cable rod vibration, thereby realizing the identification of the main frequency of cable rod vibration.

[0056] The present application provides a method for identifying the main frequency of cable-rod vibration, including obtaining a spectrum diagram of cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtaining a spectrum set of each order; calculating the frequency coincidence corresponding to each peak point in the spectrum set according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum set; screening out the peak frequency corresponding to the maximum frequency coincidence value from the spectrum set as the main frequency of the order; performing correlation analysis on all main frequencies of each order to obtain the correlation coefficient; judging whether all main frequencies are the main frequencies for identifying the vibration of each order of the cable-rod according to the correlation coefficient. The method for identifying the main frequency of cable-rod vibration obtains the peak frequency and the spectrum peak by processing and analyzing the obtained spectrum diagram, obtains the frequency coincidence according to the estimated main frequency, the peak frequency and the spectrum peak, and determines the main frequency of the corresponding order according to all the frequency coincidences of each order, and then judges whether all the main frequencies obtained can be used as the main frequencies for identifying the vibration of each order of the cable-rod, so as to realize the identification of the main frequency of cable-rod vibration; and solves the technical problem that the existing method for identifying the main frequency of the cable-rod has difficulty in identification.

[0057] In one embodiment of the present application, correlation analysis is performed on all main frequencies of each order to obtain the correlation coefficient, including: drawing a curve graph according to the order of vibration frequencies of each order and the main frequencies corresponding to each order, and performing correlation analysis on the curve graph using the least squares curve fitting method to obtain the correlation coefficient.

[0058] It should be noted that according to the vibration frequency order of each order and the main frequency corresponding to each order, the vibration frequency order i 2 As the horizontal axis, the main frequency as the vertical axis to draw a curve graph, and then use the least squares curve fitting method to fit the fitting line to obtain the correlation coefficient. In this embodiment, the fitting line can be used as fi 2 =ai 4 +bi 2 This expression indicates that a and b are both fitting parameters. In other embodiments, the fitting line can also be represented by a conventional statistical regression-related function, and the obtained correlation coefficient is a conventional statistical regression-related index value.

[0059] In one embodiment of the present application, judging whether all main frequencies are identified main frequencies of various order vibrations of the cable rod according to the correlation coefficient includes:

[0060] If the correlation coefficient is greater than the coefficient threshold, all main frequencies are used as the identified main frequencies of each order of cable-rod vibration;

[0061] If the correlation coefficient is not greater than the coefficient threshold, the main frequencies corresponding to the large deviation from the fitting line are eliminated from the fitting line obtained by the least square curve fitting method on the curve graph until the correlation coefficient is greater than the coefficient threshold. Then all the remaining main frequencies are used as the identification main frequencies of the corresponding vibrations of each order of the cable rod;

[0062] Among them, the number of eliminated main frequencies shall not exceed one fifth of the total number of all main frequencies.

[0063] It should be noted that the coefficient threshold can be set as required. In this embodiment, the coefficient threshold is 0.95. If the correlation coefficient is not greater than the coefficient threshold, a main frequency value is gradually eliminated from the distance to the fitting line from large to small until the correlation coefficient obtained after elimination is greater than the coefficient threshold. Because the spectrum diagram obtained in step S1 may have interference or problems with the acquisition element, and the more correlation analysis data, the better; therefore, in order to ensure the accuracy of the main frequency of the cable rod obtained by the cable rod vibration main frequency identification method, it is required that the number of eliminated main frequencies does not exceed one-fifth of the total number of all main frequencies. If the number of eliminated main frequencies exceeds one-fifth of the total number of all main frequencies, data is collected again according to steps S1 to S3 to identify the main frequency of the cable rod vibration.

[0064] Figure 4This is a first frequency curve diagram of the cable rod vibration main frequency identification method described in an embodiment of the present application.

[0065] In one embodiment of the present application, obtaining the estimated main frequency of each order vibration of the cable rod includes:

[0066] Obtaining the design parameters of the cable rod, and calculating the initial frequencies of each order of vibration of the cable rod according to the design parameters; the design parameters include the bending stiffness of the cable of the cable rod, the cable length, the cable line density and the tension;

[0067] A continuous and uninterrupted first frequency curve is constructed according to all peak frequencies and spectrum peaks, and a second frequency curve is constructed according to the order of vibration frequencies of each order and the corresponding initial frequency;

[0068] Determine whether the initial frequency is used as the estimated main frequency of the corresponding order according to whether the initial frequency and the spectrum number set of each order meet the constraint condition or whether the first frequency curve and the second frequency curve meet the constraint condition;

[0069] The constraint conditions include: the difference between the initial frequency and each peak frequency in the frequency spectrum data set is less than a set frequency threshold; or the first frequency curve overlaps with the second frequency curve.

[0070] It should be noted that the frequency threshold can be set according to the requirements. In this embodiment, the frequency threshold is set to 0.5Hz. The cable rod vibration main frequency identification method obtains the initial frequency of each order of cable rod vibration by designing the parameters of the cable rod and using the frequency calculation formula. Then, the calculated initial frequency and the corresponding vibration frequency order are plotted into a second frequency curve; and the spectrum peak value P is selected from all the peak frequencies and spectrum peaks obtained in step S1. k The peak frequencies and spectrum peaks in the top 10 values ​​are ranked from large to small to construct a curve, and the longest continuous and uninterrupted peak frequency F is extracted from the curve. k The curve of the sequence is taken as the first frequency curve, such as Figure 4 As shown. According to whether the initial frequency of each order and the peak frequency of the spectrum data set meet the constraint condition or the first frequency curve and the second frequency curve meet the constraint condition, the initial frequency calculated for each order is determined as the estimated main frequency of the corresponding order. In this embodiment, the first frequency curve is close to or similar to the second frequency curve, indicating that the constraint condition is met, and the initial frequency calculated for each order is used as the estimated main frequency of the corresponding order.

[0071] In the embodiment of the present application, the frequency calculation formula is:

[0072]

[0073] Where EI is the bending stiffness of the cable, L is the cable length, ρ is the cable linear density, i and fi are the vibration frequency order and the frequency of the i-th order, respectively, and T is the tension of the cable.

[0074] In one embodiment of the present application, obtaining the estimated main frequency of each order vibration of the cable rod includes: if the constraint condition is not satisfied, adjusting the tension of the design parameter until the calculated initial frequency satisfies the constraint condition, and obtaining the calculated initial frequency as the estimated main frequency of the order.

[0075] It should be noted that when the constraints are not met, the cable rod vibration main frequency identification method increases the tension value according to the multiple initial frequencies close to the left side of the continuous peak value; otherwise, the tension value is reduced and the initial frequency is recalculated using the frequency calculation formula.

[0076] In one embodiment of the present application, obtaining a spectrum diagram of cable rod vibration includes: collecting vibration signals of various orders by a signal collection element disposed at a middle position of the cable rod; and processing the vibration signals of various orders by Fourier transform to obtain a spectrum diagram of cable rod vibration.

[0077] It should be noted that the signal acquisition element can be selected as an acceleration sensor. In this embodiment, the acceleration sensor is fixed on the cable rod, and the fixing position needs to avoid the stationary point of the first 10th order vibration of the cable rod, and is preferably located in the middle of two adjacent stationary points. For a cable rod with a cable length of L, the stationary point position within the 10th order is: x k0，n0 =k0L / n0, k0=0, 1, ..., n0, n0=1, 2, ....., 10. The vibration signal of the forced free vibration section of the cable rod after being struck is collected by an acceleration sensor, and the collected vibration signal is Fourier transformed to obtain a vibration spectrum diagram. In other embodiments, the signal acquisition element can also be a collection element (such as a vibration sensor) that can collect vibration signals. The vibration sensor includes an inductive vibration sensor, an eddy current vibration sensor, a capacitive vibration sensor, a resistive strain vibration sensor, a piezoelectric vibration sensor, etc. Fourier transform technology is a relatively mature technology in this field and will not be elaborated here.

[0078] Embodiment 2:

[0079] Figure 5 It is a schematic diagram of the framework of the cable rod vibration main frequency identification device described in an embodiment of the present application.

[0080] like Figure 5 As shown, the embodiment of the present application provides a device for identifying the main frequency of cable rod vibration, including a data acquisition module 10, a calculation and screening module 20 and an identification and judgment module 30;

[0081] The data acquisition module 10 is used to obtain the spectrum diagram of the cable rod vibration and the estimated main frequency of each order, extract the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtain the spectrum data set of each order;

[0082] The calculation and screening module 20 is used to obtain the frequency coincidence corresponding to each peak point in the spectrum data set according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum data set; and screen out the peak frequency corresponding to the maximum frequency coincidence value from the spectrum data set as the main frequency of the order;

[0083] The identification and judgment module 30 is used to perform correlation analysis on all main frequencies of each order to obtain correlation coefficients; and to judge whether all main frequencies are identification main frequencies of each order vibration of the cable rod according to the correlation coefficients.

[0084] It should be noted that the contents of the modules in the cable rod vibration main frequency identification device in the second embodiment correspond to the steps of the cable rod vibration main frequency identification method in the first embodiment, and the steps of the cable rod vibration main frequency identification method have been described in the first embodiment, and the module contents of the cable rod vibration main frequency identification device are not described in detail in this embodiment. In this embodiment, the cable rod vibration main frequency identification device realizes the identification of the cable rod vibration main frequency through the data acquisition module 10, the calculation and screening module 20 and the identification and judgment module 30.

[0085] In the embodiment of the present application, the calculation and screening module 20 is further used to calculate the frequency coincidence corresponding to each peak point in the spectrum set by using the coincidence formula according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum set; the coincidence formula is: , k = 0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, F k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, P k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

[0086] Embodiment three:

[0087] Figure 6 A schematic diagram of a terminal device described in an embodiment of the present application.

[0088] like Figure 6 As shown, an embodiment of the present application provides a terminal device, including a processor and a memory;

[0089] A memory, used for storing program codes and transmitting the program codes to a processor;

[0090] The processor is used to execute the above-mentioned cable rod vibration main frequency identification method according to the instructions in the program code.

[0091] It should be noted that the processor is used to execute the steps in the above-mentioned cable rod vibration main frequency identification method embodiment according to the instructions in the program code. Alternatively, the processor implements the functions of each module / unit in the above-mentioned system / device embodiments when executing the computer program.

[0092] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units 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 completing a specific function, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0093] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that this does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the terminal device may also include input and output devices, network access devices, buses, etc.

[0094] 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) or 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, etc.

[0095] The memory may be an internal storage unit of the terminal device, such as a hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the terminal device. Furthermore, the memory may include both an internal storage unit of the terminal device and an external storage device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

[0096] Those skilled in the art can 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.

[0097] In the several embodiments provided in the present 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, 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.

[0098] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0100] If the integrated unit is implemented in the form of 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 application is essentially or the part that contributes to the prior art or all or 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 personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0101] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 method for identifying the main frequency of cable rod vibration, characterized in that: The following steps are involved: Obtaining a frequency spectrum diagram of the cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and the spectrum peak of each peak point from the curve of the frequency spectrum diagram according to the neighborhood interval, and obtaining a frequency spectrum number set of each order; According to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, the frequency coincidence corresponding to each peak point in the spectrum set is obtained; the peak frequency corresponding to the maximum value of the frequency coincidence is selected from the spectrum set as the main frequency of the order; A correlation analysis is performed on all the main frequencies of each order to obtain a correlation coefficient; and based on the correlation coefficient, it is determined whether all the main frequencies are the identified main frequencies of the cable rod vibrations of each order.

2. The cable rod vibration main frequency identification method according to claim 1, characterized in that: Performing correlation analysis on all the main frequencies of each order to obtain the correlation coefficient includes: drawing a curve graph according to the order of vibration frequency of each order and the main frequency corresponding to each order, and performing correlation analysis on the curve graph using the least squares curve fitting method to obtain the correlation coefficient.

3. The cable rod vibration main frequency identification method according to claim 2, characterized in that: Judging whether all the main frequencies are the identified main frequencies of the cable rod vibrations of various orders according to the correlation coefficients includes: If the correlation coefficient is greater than the coefficient threshold, all the main frequencies are used as the identified main frequencies of each order of vibration of the cable rod; If the correlation coefficient is not greater than the coefficient threshold, the main frequencies corresponding to the large deviations from the fitting line are eliminated from the fitting line obtained by fitting the curve graph using the least square curve fitting method until the obtained correlation coefficient is greater than the coefficient threshold, and all the remaining main frequencies are used as the identified main frequencies of the corresponding vibrations of each order of the cable rod; The number of the eliminated main frequencies does not exceed one fifth of the total number of all the main frequencies.

4. The cable rod vibration main frequency identification method according to claim 1, characterized in that: include: The frequency coincidence corresponding to each peak point in the spectrum set is obtained by calculating the frequency coincidence formula according to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: , k = 0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, F k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, P k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

5. The method for identifying the main frequency of cable rod vibration according to any one of claims 1 to 4, characterized in that: Obtaining the estimated main frequencies of each order of cable-rod vibration includes: Acquire design parameters of the cable rod, and calculate the initial frequencies of each order of vibration of the cable rod according to the design parameters; the design parameters include bending stiffness of the cable of the cable rod, cable length, cable line density and tension; Constructing a continuous and uninterrupted first frequency curve according to all the peak frequencies and the spectrum peaks, and constructing a second frequency curve according to the order of vibration frequencies of each order and the corresponding initial frequency; Determining whether the initial frequency of each order and the spectrum number set satisfy a constraint condition or whether the first frequency curve and the second frequency curve satisfy a constraint condition; determining whether the initial frequency is used as the estimated main frequency of the corresponding order; The constraint conditions include: the difference between the initial frequency and each peak frequency in the frequency spectrum set is less than a set frequency threshold; or the first frequency curve overlaps with the second frequency curve.

6. The cable rod vibration main frequency identification method according to claim 5, characterized in that: Obtaining the estimated main frequency of each order vibration of the cable rod includes: if the constraint condition is not satisfied, adjusting the tension of the design parameter until the calculated initial frequency satisfies the constraint condition, and obtaining the calculated initial frequency as the estimated main frequency of the order.

7. The method for identifying the main frequency of cable rod vibration according to any one of claims 1 to 4, characterized in that: Acquiring the spectrum diagram of the cable rod vibration includes: collecting vibration signals of various orders by a signal collection element arranged at the middle position of the cable rod; and processing the vibration signals of various orders by Fourier transform to obtain the spectrum diagram of the cable rod vibration.

8. A cable rod vibration main frequency identification device, characterized in that: It includes a data acquisition module, a calculation and screening module, and an identification and judgment module; The data acquisition module is used to obtain the spectrum diagram of the cable rod vibration and the estimated main frequency of each order, extract the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram according to the neighborhood interval, and obtain the spectrum data set of each order; The calculation and screening module is used to calculate, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, to obtain the frequency coincidence corresponding to each peak point in the spectrum set; and screen out the peak frequency corresponding to the maximum frequency coincidence value from the spectrum set as the main frequency of the order; The identification and judgment module is used to perform correlation analysis on all the main frequencies of each order to obtain correlation coefficients; and judge whether all the main frequencies are the identified main frequencies of each order vibration of the cable rod according to the correlation coefficients.

9. The cable rod vibration main frequency identification device according to claim 8, characterized in that: The calculation and screening module is also used to calculate the frequency coincidence corresponding to each peak point in the spectrum set by using a coincidence formula according to the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: , k = 0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum set, F k is the kth peak frequency in the spectrum set, f yi is the estimated main frequency of the i-th vibration frequency order, P k is the kth spectrum peak in the spectrum set, L k is the kth frequency coincidence degree.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program codes and transmit the program codes to the processor; The processor is used to execute the cable rod vibration main frequency identification method according to any one of claims 1 to 7 according to the instructions in the program code.

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