A method, device and terminal device for identifying the main frequency of cable rod vibration

Abstract

The present application relates to a method, apparatus, and terminal device for identifying the main frequency of cable-rod vibration. The method comprises obtaining a spectrum diagram of cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and spectrum peak value of each peak point from the curve of the spectrum diagram according to a neighborhood interval to obtain a spectrum set of each order; calculating the frequency overlap based on the estimated main frequency of each order and the peak frequency and spectrum peak value in the spectrum set; selecting the peak frequency corresponding to the maximum frequency overlap value from the spectrum set as the main frequency of that order; performing a correlation analysis on all main frequencies of each order to obtain a correlation coefficient; and determining the main frequency of each order of cable-rod vibration based on the correlation coefficient. The method obtains the frequency overlap by processing the estimated main frequency, peak frequency, and spectrum peak value, determines the main frequency of the corresponding order based on all the frequency overlaps of each order, and then determines whether all the main frequencies obtained can be used as the main frequency of each order of cable-rod vibration, thereby achieving identification of the main frequency of cable-rod vibration.

Description

Technical Field

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

[0002] Cable-stayed structures are a common architectural form. They utilize cables (or cable rods) suspended from supporting points to support the building's gravity, resulting in a unique appearance and functionality. Identifying the dominant frequency is fundamental to inferring cable-rod tension and significantly influences analysis results.

[0003] When testing cable-rod vibration in natural environments, the peak value of the spectrum is often affected by various factors (such as the environment), which can affect the test results. In particular, within certain frequency ranges, the spectrum of the cable-rod vibration may exhibit multiple, closely spaced peaks, making it difficult to determine the dominant frequency. For example, in the low-frequency range, the lower-order dominant frequency is mixed with the ambient vibration, making the dominant frequency peak unclear. Summary of the Invention

[0004] The present application provides a method, apparatus and terminal device for identifying the main frequency of cable rod vibration, which are used to solve the technical problem of difficulty in identifying the main frequency of cable rod in existing methods.

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

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

[0007] Obtaining a spectrum diagram of the 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 a neighborhood interval, and obtaining a spectrum data set of each order;

[0008] Calculating, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, obtaining a frequency coincidence corresponding to each peak point in the spectrum set; and selecting, from the spectrum set, the peak frequency corresponding to the maximum value of the frequency coincidence 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 vibration 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 the 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.

[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 includes:

[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 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 squares curve fitting method until the obtained correlation coefficient is greater than the coefficient threshold. Then, all the remaining main frequencies are used as the identified main frequencies of the cable rod corresponding to each order of vibration;

[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 cable rod vibration main frequency identification method comprises: calculating the frequency coincidence corresponding to each peak point in the spectrum set using a coincidence formula based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: L k =P k 2 / (f yi −F k ), k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum, 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 overlap.

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

[0017] Obtaining design parameters of the cable rod, and calculating the initial frequencies of each order of vibration of the cable rod based on the design parameters; the design parameters include bending stiffness, cable length, cable linear density, and tension of the cable rod;

[0018] Constructing a continuous and uninterrupted first frequency curve based on all the peak frequencies and the spectrum peaks, and constructing a second frequency curve based on the order of each vibration frequency 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; and 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 data 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 includes: 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 configured to calculate, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, a frequency coincidence corresponding to each peak point in the spectrum set; and screen out, from the spectrum set, the peak frequency corresponding to the maximum frequency coincidence value 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 configured to calculate the frequency coincidence corresponding to each peak point in the spectrum set using a coincidence formula based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set; the coincidence formula is: L k =P k 2 / (f yi −F k ), k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum, 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 kis the kth spectrum peak in the spectrum set, L k is the kth frequency overlap.

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

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

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

[0031] The present invention relates to a method, apparatus and terminal device for identifying the main frequency of cable-rod vibration. The method comprises obtaining a spectrum diagram of cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and spectrum peak value of each peak point from the curve of the spectrum diagram according to a 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 based on the estimated main frequency of each order and the peak frequency and spectrum peak value in the spectrum number set; screening out the peak frequency corresponding to the maximum frequency coincidence value from the spectrum number set as the main frequency of the order; performing a correlation analysis on all the main frequencies of each order to obtain a correlation coefficient; and judging whether all the main frequencies are the identified main frequencies of the cable-rod vibration of each order according to the correlation coefficient.

[0032] It can be seen from the above technical solution that the present application has the following advantages: the method for identifying the main frequency of cable rod vibration obtains the peak frequency and 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 main frequencies for identifying the vibrations of each order of the cable rod, thereby realizing the identification of the main frequency of the cable rod vibration; it solves the technical problem of the difficulty in identifying the main frequency of the cable rod in the existing method. 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 following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

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

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

[0036] 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;

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

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

[0039] Figure 6 This is a schematic diagram of the 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 the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the embodiments of the present application, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0043] The embodiments of the present application provide a method, apparatus, and terminal device for identifying the main frequency of cable rod vibration, which solve the technical problem of difficulty in identifying the main frequency of cable rods in existing methods.

[0044] Example 1:

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

[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 needs. Figure 2 and Figure 3 As shown, 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 method for identifying the main frequency of cable-rod vibration extracts the peak frequency and spectrum peak of each peak point from the curve of the spectrum diagram. The peak points of each order can be inferred and screened based on the order design value or previous test results from the peak frequency and spectrum peak of each extracted peak point, thereby obtaining a spectrum number set consisting of the peak frequency and spectrum peak corresponding to all peak points of each order.

[0050] S2. Obtain 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 value 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 value is used 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 using the coincidence formula based on the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum set; the coincidence formula is: L k =P k 2 / (f yi −F k ), k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum, 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 overlap.

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

[0054] It should be noted that in step S3, a graph is drawn based on the main frequencies of all orders of the cable rod and the corresponding vibration frequency orders obtained in step S2, and the correlation of all main frequencies is analyzed according to the graph to obtain a correlation coefficient. 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 vibration of the cable rod, thereby realizing the identification of the main frequency of the cable rod vibration.

[0056] The present application provides a method for identifying the main frequency of cable-rod vibration, comprising obtaining a spectrum diagram of cable-rod vibration and an estimated main frequency of each order, extracting the peak frequency and spectrum peak value of each peak point from the curve of the spectrum diagram according to a neighborhood interval, and obtaining a spectrum set of each order; calculating the frequency overlap 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 value in the spectrum set; selecting the peak frequency corresponding to the maximum frequency overlap value from the spectrum set as the main frequency of that order; performing a correlation analysis on all main frequencies of each order to obtain a correlation coefficient; and determining whether all main frequencies are the main frequencies for identifying the main frequencies of the cable-rod vibration of each order based on the correlation coefficient. The method for identifying the main frequency of cable-rod vibration obtains peak frequency and spectrum peak value by processing and analyzing the obtained spectrum diagram, obtains frequency overlap based on the estimated main frequency, peak frequency, and spectrum peak value, and determines the main frequency of the corresponding order based on all frequency overlaps of each order. Then, determining whether all the main frequencies obtained can be used as the main frequencies for identifying the main frequencies of the cable-rod vibration of each order is achieved, thereby solving the technical problem of difficulty in identifying the main frequencies of cable-rod vibration in existing methods.

[0057] In one embodiment of the present application, correlation analysis is performed on all main frequencies of each order to obtain the correlation coefficient, which 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.

[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, 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 identification main frequencies of each order vibration of the cable rod;

[0061] If the correlation coefficient is not greater than the coefficient threshold, the least square curve fitting method is used to fit the fitted line on the curve graph, and the main frequencies corresponding to the large deviation from the fitted line are eliminated until the obtained correlation coefficient is greater than the coefficient threshold. Then all the remaining main frequencies are used as the identification main frequencies of the corresponding vibration orders 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 needed. In this embodiment, the coefficient threshold is 0.95. If the correlation coefficient is not greater than the coefficient threshold, the main frequency value is gradually eliminated from the largest to the smallest distance from the fitting line 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 identification method of the cable rod vibration, the number of main frequencies to be eliminated is required to not exceed one-fifth of the total number of all main frequencies. If the number of main frequencies to be eliminated 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 4 This 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 frequencies of each order vibration of the cable rod includes:

[0066] Obtain the design parameters of the cable rod and calculate the initial frequencies of each order of vibration of the cable rod based on the design parameters; the design parameters include the bending stiffness of the cable rod, the cable length, the cable linear density and the tension;

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

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

[0069] The constraint conditions include: the difference between the initial frequency and each peak frequency in the 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 as needed. In this embodiment, the frequency threshold is set to 0.5Hz. The cable rod vibration main frequency identification method calculates the initial frequency of each order of cable rod vibration by designing the cable rod parameters 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 used as the first frequency curve, such as Figure 4 As shown. Based on whether the initial frequency of each order and the peak frequency of the spectrum data set satisfy the constraints, or whether the first frequency curve and the second frequency curve satisfy the constraints, the initial frequency calculated for each order is determined as the estimated main frequency of the corresponding order. In this embodiment, if the first frequency curve is close to or similar to the second frequency curve, it means that the constraints are satisfied, 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; 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 an acceleration sensor. In this embodiment, the acceleration sensor is fixed on the cable rod. The fixing position needs to avoid the stagnation point of the first 10 orders of vibration of the cable rod, and is preferably located in the middle of two adjacent stagnation points. For a cable rod with a cable length of L, the stagnation point position within the 10th order is: xk0，n0 = k0L / n0, k0=0, 1, ..., n0, n0=1, 2, ..., 10. An acceleration sensor is used to collect vibration signals from the forced free vibration phase of the cable rod after being struck. The collected vibration signals are then Fourier transformed to obtain a vibration spectrum. In other embodiments, the signal acquisition element may also be a component capable of collecting vibration signals (such as a vibration sensor). Vibration sensors include inductive vibration sensors, eddy current vibration sensors, capacitive vibration sensors, resistive strain gauge vibration sensors, piezoelectric vibration sensors, and the like. Fourier transform technology is a relatively mature technique in this field and will not be elaborated on in detail here.

[0078] Example 2:

[0079] Figure 5 This 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 configured to obtain a frequency coincidence corresponding to each peak point in the spectrum data set based on the estimated main frequency of each order and the peak frequency and spectrum peak value in the spectrum data set; and to select 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 modules in the cable-rod vibration primary frequency identification device of Example 2 correspond to the steps of the cable-rod vibration primary frequency identification method of Example 1. The steps of the cable-rod vibration primary frequency identification method have been described in Example 1, and the modules of the cable-rod vibration primary frequency identification device will not be further described in this example. In this embodiment, the cable-rod vibration primary frequency identification device identifies the cable-rod vibration primary frequency through a data acquisition module 10, a calculation and screening module 20, and an identification and judgment module 30.

[0085] In the embodiment of the present application, the calculation and screening module 20 is further configured to calculate the frequency coincidence corresponding to each peak point in the spectrum data set using the coincidence formula according to the estimated main frequency of each order and the peak frequency and spectrum peak in the spectrum data set; the coincidence formula is: L k =P k 2 / (f yi −F k ), k=0, 1, ..., n, where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum, 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 overlap.

[0086] Example 3:

[0087] Figure 6 This is a schematic diagram of the 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, configured to store program codes and transmit the program codes to a processor;

[0090] The processor is configured 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 configured to execute the steps of the embodiment of the cable rod vibration main frequency identification method according to the instructions in the program code. Alternatively, the processor implements the functions of the modules / units in the above-mentioned system / device embodiments when executing the computer program.

[0092] For example, a computer program may be divided into one or more modules / units, one or more of which are stored in a memory and executed by a processor to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0093] Terminal devices can be computing devices such as desktop computers, laptops, PDAs, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will appreciate that this does not constitute a limitation on terminal devices and may include more or fewer components than shown, or a combination of certain components, or different components. For example, terminal devices may also include input / output devices, network access devices, buses, and the like.

[0094] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) 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.

[0095] Memory can be an internal storage unit of a terminal device, such as a hard drive or memory. It can also be an external storage device, such as a plug-in hard drive, a Smart Memory Card (SMC), a Secure Digital (SD) card, or a flash memory card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or is about to be output.

[0096] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

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

[0099] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[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, 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 and includes a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for identifying the main frequency of cable rod vibration, characterized in that: The following steps are involved: Obtaining a spectrum diagram of the 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 a neighborhood interval, and obtaining a spectrum data set of each order; Calculating, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, obtaining a frequency coincidence corresponding to each peak point in the spectrum set; and selecting, from the spectrum set, the peak frequency corresponding to the maximum value of the frequency coincidence 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 vibration of each order.

2. The cable rod vibration main frequency identification method according to claim 1, characterized in that: Performing a correlation analysis on all the main frequencies of each order to obtain a correlation coefficient includes: drawing a curve graph according to the order of the vibration frequency of each order and the main frequency corresponding to each order, and performing a correlation analysis on the curve graph using a least squares curve fitting method to obtain a 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 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 squares curve fitting method until the obtained correlation coefficient is greater than the coefficient threshold. Then, all the remaining main frequencies are used as the identified main frequencies of the cable rod corresponding to each order of vibration; 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 using the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set using the coincidence formula; the coincidence formula is: L k = P k 2 / ( f yi − F k ), k =0, 1, ..., n , where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum data set, F k The first k The peak frequency, f yi For the i The estimated main frequency of the vibration frequency order, P k The first k spectral peaks, L k For the k Frequency overlap.

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: Obtaining design parameters of the cable rod, and calculating the initial frequencies of each order of vibration of the cable rod based on the design parameters; the design parameters include bending stiffness, cable length, cable linear density, and tension of the cable rod; Constructing a continuous and uninterrupted first frequency curve based on all the peak frequencies and the spectrum peaks, and constructing a second frequency curve based on the order of each vibration frequency 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; and 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 data 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: Obtaining 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 device for identifying the main frequency of cable rod vibration, characterized in that: It includes data acquisition module, calculation and screening module and 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 configured to calculate, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, a frequency coincidence corresponding to each peak point in the spectrum set; and screen out, from the spectrum set, the peak frequency corresponding to the maximum frequency coincidence value 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 further configured to calculate, based on the estimated main frequency of each order and the peak frequency and the spectrum peak in the spectrum set, using a coincidence formula to obtain a frequency coincidence corresponding to each peak point in the spectrum set; the coincidence formula is: L k = P k 2 / ( f yi − F k ), k =0, 1, ..., n , where i is the vibration frequency order, n is the total number of peak frequencies in the spectrum data set, F k The first k The peak frequency, f yi For the i The estimated main frequency of the vibration frequency order, P k The first k spectral peaks, L k For the k Frequency overlap.

10. A terminal device, characterized in that: including a processor and a memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the 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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