Part dynamic performance determination method, device and equipment and readable storage medium

Abstract

The invention discloses a part dynamic performance determination method and device, equipment and a readable storage medium. According to the invention, the static offset is removed from the original acceleration output by the vibration meter, so that noise interference is reduced; the vibration exciter is directly connected with the tested part, and nonlinear distortion is eliminated, so that nonlinear distortion caused by elastic connection in a traditional method is effectively eliminated; and finally, performing data analysis processing on the basis of the second acceleration obtained by static offset removal and nonlinear distortion elimination processing, so that the finally obtained modal and vibration mode of the tested part are more accurate.

Description

Technical Field

[0001] The present application relates to the technical field of testing, and particularly relates to a method, device, equipment and computer-readable storage medium for determining the dynamic performance of components. Background Technique

[0002] The dynamic performance test of automotive components is an important link in automotive design and R & D. Especially in aspects such as vehicle vibration and noise control, suspension systems, and body stiffness, it is crucial to accurately understand the modal characteristics of components. Modal testing technology analyzes the dynamic parameters such as natural frequencies, vibration modes, and damping by applying excitation to components and recording their responses, thereby providing a basis for subsequent structural optimization and performance improvement. With the progress of technology, modal testing technology has been widely applied in multiple fields such as automotive, aerospace, and mechanical manufacturing, and has become a core tool for evaluating the performance and safety of components.

[0003] In the automotive industry, the dynamic characteristics of components directly affect the handling, stability, and comfort of the entire vehicle. Therefore, accurate modal analysis of automotive components is crucial. By performing frequency response analysis on components through dynamic experiments, their performance under different working conditions can be revealed, thereby optimizing the component design and improving the overall performance of the vehicle.

[0004] Traditional automotive component modal testing technology usually uses a vibration table or shaker as the excitation source, and uses detectors such as acceleration sensors and displacement sensors to record the response signals of components. During the test, the excitation source applies periodic or impact excitation, and the vibration response of the component is collected by the sensor. Then, the frequency response characteristics of the component are obtained through methods such as spectral analysis. This process usually relies on frequency domain analysis, such as Fourier transform, to convert the time domain signal into a frequency domain signal, thereby extracting key parameters such as modal frequencies, vibration modes, and damping.

[0005] Traditional modal testing methods rely on the accurate capture of vibration signals by sensors. Commonly used methods include the multi-point acceleration sensor arrangement method and the single-point response method. Although these methods can achieve a certain degree of component modal analysis, they may face some challenges when dealing with complex dynamic systems, especially in systems with high-frequency, large-amplitude vibrations, and obvious nonlinear effects, where the accuracy and reliability of the test may be limited.

[0006] The main defects existing in the prior art lie in the non-linear connection structure between the excitation source and the components, the interference of signal noise, and the complexity of modal testing. In traditional technologies, the elastic connection between the shaker and the components to be tested will produce non-linear distortion, affecting the accuracy of test results. In addition, due to the coupling effect of the excitation signal and the component response signal, it is difficult for traditional test methods to effectively distinguish the actual component response from other noise sources or systematic errors, which makes data processing and signal interpretation in the frequency response analysis and modal identification processes relatively difficult. Summary of the Invention

[0007] To solve at least one of the above technical problems, the present application provides a method, device, equipment, and computer-readable storage medium for determining the dynamic performance of components.

[0008] In a first aspect, an embodiment of the present application provides a method for determining the dynamic performance of components, and the method for determining the dynamic performance of components includes:

[0009] Remove the static offset from the original acceleration output by the vibration measuring instrument to obtain a first acceleration, where the acceleration sensor of the vibration measuring instrument is fixed on the component to be tested, and an exciter is also fixed on the component to be tested, and the exciter is used to apply excitation to the component to be tested;

[0010] Perform non-linear distortion elimination processing on the first acceleration to obtain a second acceleration;

[0011] Based on the second acceleration, perform data analysis processing to obtain the mode and vibration mode of the component to be tested.

[0012] In combination with the first aspect, in an implementation manner, the static offset is the acceleration output by the vibration measuring instrument when the component to be tested is in a non-vibrating state.

[0013] In combination with the first aspect, in an implementation manner, after removing the static offset from the original acceleration output by the vibration measuring instrument to obtain a first acceleration, it further includes:

[0014] When the first acceleration is zero and the duration reaches a preset duration, stop the operation of the vibration measuring instrument.

[0015] In combination with the first aspect, in an implementation manner, the performing non-linear distortion elimination processing on the first acceleration to obtain a second acceleration includes:

[0016] Calculate the ratio of the first acceleration to the g response at the position, and use the ratio as the second acceleration, where the g response at the position is the acceleration response of the acceleration sensor under the action of gravity at its installation position.

[0017] In combination with the first aspect, in one embodiment, performing data analysis and processing based on the second acceleration to obtain the mode and vibration mode of the component to be measured includes:

[0018] Performing convolution processing on the second acceleration to obtain the displacement response of the component to be measured;

[0019] Based on the displacement response, obtaining the frequency response characteristic function of the component to be measured;

[0020] Based on the frequency response characteristic function, obtaining the mode and vibration mode of the component to be measured.

[0021] In combination with the first aspect, in one embodiment, obtaining the frequency response characteristic function of the component to be measured based on the displacement response includes:

[0022] Performing a fast Fourier transform on the displacement response to obtain the frequency response characteristic function of the component to be measured.

[0023] In combination with the first aspect, in one embodiment, obtaining the mode and vibration mode of the component to be measured based on the frequency response characteristic function includes:

[0024] Taking the first derivative of the frequency response characteristic function to obtain the mode and vibration mode of the component to be measured.

[0025] In a second aspect, an embodiment of the present application provides a device for determining the dynamic performance of a component. The device for determining the dynamic performance of a component includes:

[0026] A first denoising module, configured to remove the static offset from the original acceleration output by the vibration measuring instrument to obtain a first acceleration. The acceleration sensor of the vibration measuring instrument is fixed on the component to be measured, and an exciter is also fixed on the component to be measured, and the exciter is configured to apply an excitation to the component to be measured;

[0027] A second denoising module, configured to perform non-linear distortion elimination processing on the first acceleration to obtain a second acceleration;

[0028] An analysis module, configured to perform data analysis and processing based on the second acceleration to obtain the mode and vibration mode of the component to be measured.

[0029] In a third aspect, an embodiment of the present application provides a device for determining the dynamic performance of a component. The device for determining the dynamic performance of a component includes a processor, a memory, and a program for determining the dynamic performance of a component stored on the memory and executable by the processor. When the program for determining the dynamic performance of a component is executed by the processor, the steps of the method for determining the dynamic performance of a component as described in the first aspect are implemented.

[0030] Fourthly, an embodiment of the present application provides a computer-readable storage medium, on which a program for determining the dynamic performance of components is stored. When the program for determining the dynamic performance of components is executed by a processor, the steps of the method for determining the dynamic performance of components as described in the first aspect are implemented.

[0031] The beneficial effects brought by the technical solutions provided by the embodiments of the present application include:

[0032] In the embodiments of the present application, by removing the static offset from the original acceleration output by the vibration measuring instrument, the noise interference is reduced; by directly connecting the exciter to the component to be measured and performing non-linear distortion elimination processing, the non-linear distortion caused by elastic connection in the traditional method is effectively removed; finally, based on the second acceleration obtained after removing the static offset and non-linear distortion elimination processing, data analysis and processing are performed, so that the mode and vibration mode of the component to be measured finally obtained are more accurate. Description of the Drawings

[0033] Figure 1 It is a schematic flowchart of an embodiment of the method for determining the dynamic performance of components of the present application;

[0034] Figure 2 It is a schematic diagram of obtaining the displacement response in an embodiment of the method for determining the dynamic performance of components of the present application;

[0035] Figure 3 It is a schematic diagram of obtaining the frequency response characteristic function in an embodiment of the method for determining the dynamic performance of components of the present application;

[0036] Figure 4 It is a flow chart for extracting the mode and vibration mode in an embodiment of the method for determining the dynamic performance of components of the present application;

[0037] Figure 5 It is a schematic diagram of the functional modules of an embodiment of the device for determining the dynamic performance of components of the present application;

[0038] Figure 6 It is a schematic diagram of the hardware structure of the equipment for determining the dynamic performance of components involved in the solution of the embodiment of the present application. Detailed Embodiments

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0040] To make the objectives, technical solutions, and advantages of this application more clear, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0041] In a first aspect, an embodiment of this application provides a method for determining the dynamic performance of components.

[0042] In one embodiment, referring to Figure 1 , Figure 1 is a schematic flowchart of an embodiment of the method for determining the dynamic performance of components in this application. As Figure 1 shown, the method for determining the dynamic performance of components includes:

[0043] Step S10: Remove the static offset from the original acceleration output by the vibration measuring instrument to obtain the first acceleration. Among them, the acceleration sensor of the vibration measuring instrument is fixed on the component to be measured, and an exciter is also fixed on the component to be measured, and the exciter is used to apply an excitation to the component to be measured.

[0044] To apply an excitation to the component to be measured, the impact signal is identified by using the time-domain response expression recorded by the acceleration sensor, and then the frequency of the excitation signal is determined. Specifically, in this step, it is desired to identify the frequency of the impact signal through the acceleration response obtained by the acceleration sensor, so as to accurately apply the excitation signal.

[0045] First, the output of the acceleration sensor is represented by the time domain response. Assume that the acceleration response y(t) can be represented by the extreme point of the impulse function δ(t), and this representation is usually applicable to the case of impact signals. The impulse signal can excite the resonance frequency of the system, thereby generating a response related to the frequency response characteristics of the component. The specific expression is:

[0046] y(t) = A * δ(t)

[0047] Among them, A is the amplitude of the impulse signal; y(t) = A * δ(t) is the impulse function, which represents the response of the system to the instantaneous excitation. The characteristic of the impulse function is that it has an extreme value at t = 0, and its area is 1, which can excite all frequency components of the system.

[0048] Next, consider the frequency response function H(ω) of the component to be measured. When the frequency response function has a single extreme point, it means that there is a resonance peak at a certain frequency ω s , which is usually related to the resonance frequency f0 of the component to be measured. In this case, by performing a Fourier transform on the impact response recorded by the acceleration sensor, the resonance frequency ω of the system can be identified s , and then the resonance frequency f0 of the component to be measured can be determined.

[0049] By performing time-domain analysis and frequency-domain analysis on the output signals of the acceleration sensor, the resonance characteristics of the system under excitation can be identified. In particular, by applying an impact excitation with a vibration meter and recording the acceleration output at the impact point in real time, the frequency components of the impact signal can be extracted from these data to further confirm the resonance frequency of the component.

[0050] In this embodiment, before performing step S10, the following preparations are made first:

[0051] Install and fix the acceleration sensor of the vibration meter on the component to be measured; place the component to be measured on the excitation table, fix the exciter on the automotive component to be measured, and apply excitation to the component to be measured; start and set the vibration meter, and the vibration meter outputs the original acceleration based on the measurement value of the acceleration sensor.

[0052] After completing the above preparations, the execution entity of the present application can obtain the original acceleration output by the vibration meter.

[0053] Due to the offset and noise of the vibration meter itself, the original acceleration output by it may contain a static offset. Therefore, it is necessary to remove the static offset from the original acceleration output by the vibration meter. For example, at time t n , the output of the vibration meter is 2 m / s 2 , and the static offset is 1 m / s 2 , then the first acceleration at time t n is:

[0054] 2 m / s 2 - 1 m / s 2 = 1 m / s 2 . This processing method ensures that the influence of the offset of the device itself can be removed during the actual measurement process, and more accurate acceleration data can be obtained.

[0055] Further, in one embodiment, the static offset is the acceleration output by the vibration meter when the component to be measured is in a non-vibrating state.

[0056] In this embodiment, install and fix the acceleration sensor of the vibration meter on the component to be measured; place the component to be measured on the excitation table; control the component to be measured to be in a non-vibrating state, start and set the vibration meter, and use the acceleration output by the vibration meter based on the measurement value of the acceleration sensor at this time as the static offset.

[0057] Further, in one embodiment, after step S10, it further includes:

[0058] When the first acceleration is zero and the duration reaches a preset duration, stop the operation of the vibration meter.

[0059] In this embodiment, when the first acceleration is zero and the duration reaches the preset duration, if the acquisition continues, the subsequent data has no substantial significance for obtaining the key parameters of the modal test, but instead increases the data processing volume and time cost. Stopping the vibration measuring instrument can make the test process more efficient, focus on the effective data, and avoid wasting resources.

[0060] Step S20: Perform non-linear distortion elimination processing on the first acceleration to obtain a second acceleration;

[0061] In this embodiment, directly connecting the exciter to the component to be measured removes the non-linear distortion caused by the elastic connection in the traditional method to a certain extent. On this basis, non-linear distortion elimination processing is performed on the first acceleration to further eliminate non-linear distortion.

[0062] Further, in one embodiment, step S20 includes:

[0063] Calculate the ratio of the first acceleration to the position g response, and use the ratio as the second acceleration, where the position g response is the acceleration response of the acceleration sensor under the action of gravity at its installation position.

[0064] In this embodiment, an acceleration sensor is used to measure the vibration response of the component to be measured, and the non-linear distortion of the exciter is eliminated through the coupling coefficient between the acceleration sensor and the component to be tested.

[0065] First, assume that the output response y(t) of the component to be measured is generated by the excitation force x(t) applied by the exciter through the frequency response function h(t). The relationship between the output response y(t) and the excitation force x(t) is:

[0066] y(t) = h(t) * x(t)

[0067] Where y(t) is the output response of the component to be measured; x(t) is the excitation function of the exciter force; h(t) is the frequency response function, which represents the dynamic characteristics of the component to be measured.

[0068] When using an acceleration sensor to measure vibration, the relationship between the output response y1(t) of the acceleration sensor, the frequency response function h(t) of the component to be tested, and the coupling coefficient a i between them can be expressed as:

[0069] y1(t) = a1 * h(t)

[0070] Where a1 is the coupling coefficient between the acceleration sensor and the component to be measured, usually a constant, which is determined by the acceleration transfer function of the acceleration sensor.

[0071] In summary, it can be obtained that:

[0072] y1(t) = h(t) * x(t)

[0073] This equation indicates that the relationship between the vibration response y1(t) measured by the acceleration sensor and the excitation signal x(t) of the shaker depends on the frequency response function h(t).

[0074] When there are multiple acceleration sensors on the component to be measured, it is necessary to process the time-domain responses output by multiple acceleration sensors. Suppose there are N acceleration sensors, then the output responses of each sensor are y1(t), y2(t),... y N (t), respectively. By relating the output of each sensor to the corresponding frequency response function and excitation signal, an expression in matrix form can ultimately be obtained:

[0075] Y = H * X

[0076] where Y is a column vector composed of the time-domain acceleration responses output by all acceleration sensors; H is a frequency response matrix composed of the frequency response functions of the component to be measured; X is the excitation matrix, representing the excitation signal of the shaker.

[0077] To better describe the dynamic relationship between these acceleration sensors and the component, the relative position response g(t) is further introduced. Specifically, considering the different positions of each acceleration sensor, the response between each sensor and the component is different. By constructing the corresponding frequency response function matrix H s , combining the acceleration response output by the acceleration sensor with the relative position response g(t) between the acceleration sensor and the component, the following relationship is obtained:

[0078] Y s = H s * X s

[0079] where Y s is the response matrix output by the acceleration sensor, X s is the output matrix of the shaker, and H s is the frequency response function matrix composed of the relative position g responses. In this way, the nonlinear distortion of the shaker can be eliminated through Y s because the relationship between H s and H is the same.

[0080] Through these steps, it can be ensured that the second acceleration can truly reflect the dynamic characteristics of the component to be measured, providing accurate data for subsequent data analysis and processing.

[0081] Step S30: Based on the second acceleration, perform data analysis and processing to obtain the mode and vibration mode of the component to be measured.

[0082] In this embodiment, after obtaining the second acceleration that can truly reflect the dynamic characteristics of the measured component based on Step 10 and Step S20, data analysis and processing are performed based on the second acceleration, so that the mode and vibration mode of the measured component finally obtained are more accurate.

[0083] In the embodiment of the present application, by removing the static offset from the original acceleration output by the vibration measuring instrument, the noise interference is reduced; by directly connecting the exciter to the measured component and performing nonlinear distortion elimination processing, the nonlinear distortion caused by elastic connection in the traditional method is effectively removed; finally, data analysis and processing are performed based on the second acceleration obtained after removing the static offset and nonlinear distortion elimination processing, so that the mode and vibration mode of the measured component finally obtained are more accurate.

[0084] In addition, in the traditional technology, when dealing with the responses in different frequency ranges, complex measurement and data analysis work are required. Especially in the case where the dynamic system response is complex and variable, the traditional method may not be able to quickly and accurately extract the modal parameters, resulting in low test efficiency and difficulty in meeting the high-precision test requirements. Based on this, in the embodiment of the present application, while improving the measurement process (refer to the embodiment of Step S10 to Step S20), the data analysis and processing process is further optimized. Specifically, in one embodiment, Step S30 includes:

[0085] Step S301, performing convolution processing on the second acceleration to obtain the displacement response of the measured component;

[0086] In this embodiment, the second acceleration is related to the frequency response function through convolution operation, so as to obtain the displacement response of the measured component. The core of this process is to discretize the time-domain response of the system and perform analysis using the Fourier transform.

[0087] First, assume that the response function of the measured component is y(t), where h(t - τ) represents the frequency response function of the measured component, and τ is the time delay. Refer to Figure 2 , Figure 2 is a schematic diagram of obtaining the displacement response in one embodiment of the method for determining the dynamic performance of the component of the present application. In the time domain, the relationship between y(t), the excitation signal x(t), and the frequency response function h(t) can be expressed as convolution:

[0088] y(t) = ∫0 t h(t - τ)x(τ)dτ

[0089] For the convenience of numerical calculation, especially in practical applications, this convolution formula is discretized. The time is divided into several small time intervals Δt, and h(t - τ) and x(t) are discretized into discrete functions h(τ i) and the excitation signal x(i), we get:

[0090]

[0091] where h(τ i ) is the discrete frequency response function, x(i) is the value of the excitation signal at time point i, Δt is the time interval, n is the length of the time series, and y(i) is the output response of the acceleration sensor at the i-th moment.

[0092] In actual operation, as the time n is long enough, the discretized convolution is approximated as:

[0093] y(t) = h(t) * x(t)

[0094] Next, in order to further simplify and perform frequency-domain analysis, the Fourier transform is performed on the discretized convolution formula.

[0095] Through this step, the complex convolution operation in the time domain can be transformed into a simple product operation in the frequency domain, making it easier to analyze the dynamic response of the component under test at different frequencies. This enables the extraction of the frequency response characteristics of the system in the frequency domain, providing an important basis for subsequent modal analysis.

[0096] By this method, the time-domain response measured by the acceleration sensor can be effectively converted into a displacement response, and the frequency response characteristics of the component under test can be analyzed in the frequency domain, providing accurate basic data for modal analysis and structural optimization.

[0097] Step S302: Obtain the frequency response characteristic function of the component under test based on the displacement response;

[0098] In this embodiment, frequency-domain analysis is applied to the displacement response of the component under test to obtain the frequency response characteristic function of the component under test.

[0099] Further, in one embodiment, step S302 includes:

[0100] Perform a fast Fourier transform on the displacement response to obtain the frequency response characteristic function of the component under test.

[0101] In this embodiment, combining the foregoing content, the response function y(t) and the excitation signal x(t) in the time domain are related by a convolution relationship. In the frequency domain, the convolution becomes a product operation. Referring to Figure 3 , Figure 3 is a schematic diagram of obtaining the frequency response characteristic function in one embodiment of the method for determining the dynamic performance of the components in this application. Specifically, through the Fourier transform, the time-domain convolution formula is converted into a frequency-domain form, and we can get:

[0102] Y(ω) = H(ω)X(ω)

[0103] Here, Y(ω) is the frequency-domain response of the component under test, H(ω) is the expression of the frequency response function of the component under test in the frequency domain, and X(ω) is the Fourier transform of the excitation signal.

[0104] For the excitation signal, if it is a base signal containing a single frequency, such as X = w jωt , then its Fourier transform will be very simple and have the form of an impulse function. The Fourier-transformed excitation signal can be expressed as:

[0105] X(ω) = δ(ω - ω0)

[0106] where ω is the angular frequency of the base signal, and δ(ω - ω0) is the impulse function, indicating that the signal has energy only at the frequency point ω0. The introduction of the impulse function makes the analysis in the frequency domain focus on specific frequency points.

[0107] Substituting this Fourier transform in the form of an impulse function into the previous frequency-domain response relationship Y(ω) = H(ω)X(ω), we can obtain:

[0108] Y(ω) = H(ω)δ(ω - ω0)

[0109] This means that in the frequency domain, the response Y(ω) has a non-zero value only at the frequency ω0, and its amplitude is determined by the value of the frequency response function H(ω) at this frequency point. This result shows that the excitation signal acts only at a specific frequency, so the response of the component under test is also significantly affected only at this frequency.

[0110] Through this method, the frequency response characteristics of automotive components can be accurately analyzed in the frequency domain, so as to obtain the dynamic behavior of the components at specific frequencies, providing basic data for modal analysis and vibration control. This processing method ensures that accurate analysis can be carried out for specific frequencies, and thus the response characteristics of the system can be deeply understood.

[0111] Step S303: Obtain the mode and vibration mode of the component under test based on the frequency response characteristic function.

[0112] Furthermore, in one embodiment, step S303 includes:

[0113] Take the first derivative of the frequency response characteristic function to obtain the mode and vibration mode of the component under test.

[0114] In this embodiment, the mode and vibration mode of the component under test are extracted based on the frequency-domain response function (i.e., the frequency response characteristic function) calculated previously. First, according to the previous analysis, in the frequency domain, the frequency-domain response Y(ω) is obtained by multiplying the excitation signal and the frequency response function. In particular, pay attention to a specific frequency The response characteristics under this condition, where the amplitude and phase of the frequency response function determine the mode and vibration mode of the measured component.

[0115] At this frequency the mode f0 of the measured component can be expressed by the amplitude of the frequency response function as:

[0116]

[0117] This represents that the modal amplitude f0 is the frequency response amplitude of the measured component at this frequency, that is, the amplitude of the frequency response function H(ω) at the frequency This amplitude represents the response intensity of the measured component at this frequency.

[0118] Next, the vibration mode of the measured component can also be obtained through the frequency response function at this frequency. Referring to Figure 4 , Figure 4 is the flowchart of mode and vibration mode extraction in an embodiment of the method for determining the dynamic performance of components in this application. The amplitude of the vibration mode is proportional to the modal amplitude, and there is a sine function relationship between the phase of the vibration mode and the phase of the mode:

[0119]

[0120] wherein, the phase of the vibration mode is determined by taking the phase angle of the frequency response function . Through the phase angle the phase of the vibration mode can be obtained, and this phase characterizes the relative movement direction of the component vibration at this frequency.

[0121] Through the amplitude and phase information of the frequency response function, the vibration behavior of the component in each mode can be accurately obtained, and then modal analysis and optimization design can be carried out.

[0122] In the second aspect, the embodiments of this application also provide a device for determining the dynamic performance of components.

[0123] In one embodiment, referring to Figure 5 , Figure 5 is the schematic diagram of the functional modules of an embodiment of the device for determining the dynamic performance of components in this application. As Figure 5 shown, the device for determining the dynamic performance of components includes:

[0124] The first denoising module 10 is used to remove the static offset from the original acceleration output by the vibration measuring instrument to obtain the first acceleration. Among them, the acceleration sensor of the vibration measuring instrument is fixed on the measured component, and an exciter is also fixed on the measured component, and the exciter is used to apply excitation to the measured component;

[0125] The second denoising module 20 is used to perform non-linear distortion elimination processing on the first acceleration to obtain a second acceleration;

[0126] The analysis module 30 is used to perform data analysis processing based on the second acceleration to obtain the mode and vibration mode of the measured component.

[0127] Further, in one embodiment, the static offset is the acceleration output by the vibration measuring instrument when the measured component is in a non-vibrating state.

[0128] Further, in one embodiment, the component dynamic performance determination device further includes a stop module, which is used to:

[0129] When the first acceleration is zero and the continuous duration reaches a preset duration, stop the vibration measuring instrument from working.

[0130] Further, in one embodiment, the second denoising module 20 is used to:

[0131] Calculate the ratio of the first acceleration to the position g response, and use the ratio as the second acceleration, where the position g response is the acceleration response of the acceleration sensor under the action of gravity at its installation position.

[0132] Further, in one embodiment, the analysis module 30 is used to:

[0133] Perform convolution processing on the second acceleration to obtain the displacement response of the measured component;

[0134] Obtain the frequency response characteristic function of the measured component based on the displacement response;

[0135] Obtain the mode and vibration mode of the measured component based on the frequency response characteristic function.

[0136] Further, in one embodiment, the analysis module 30 is used to:

[0137] Perform fast Fourier transform on the displacement response to obtain the frequency response characteristic function of the measured component.

[0138] Further, in one embodiment, the analysis module 30 is used to:

[0139] Take the first derivative of the frequency response characteristic function to obtain the mode and vibration mode of the measured component.

[0140] Wherein, the function realization of each module in the above component dynamic performance determination device corresponds to each step in the above component dynamic performance determination method embodiment, and its function and implementation process will not be elaborated here one by one.

[0141] In a third aspect, an embodiment of the present application provides a device for determining the dynamic performance of components. The device for determining the dynamic performance of components may be a device with data processing functions such as a personal computer (PC), a laptop computer, a server, etc.

[0142] Referring to Figure 6 , Figure 6 FIG. is a schematic diagram of the hardware structure of the device for determining the dynamic performance of components involved in the solution of the embodiment of the present application. In the embodiment of the present application, the device for determining the dynamic performance of components may include a processor, a memory, a communication interface, and a communication bus.

[0143] Among them, the communication bus can be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0144] The communication interface includes interfaces such as input / output (I / O) interfaces, physical interfaces, and logical interfaces for implementing the interconnection of components inside the device for determining the dynamic performance of components, as well as interfaces for implementing the interconnection between the device for determining the dynamic performance of components and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display screen, a keyboard, etc.

[0145] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical memory, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0146] The processor can be a general-purpose processor, and the general-purpose processor can call the program for determining the dynamic performance of components stored in the memory and execute the method for determining the dynamic performance of components provided by the embodiment of the present application. For example, the general-purpose processor can be a central processing unit (CPU). Among them, the method executed when the program for determining the dynamic performance of components is called can refer to the various embodiments of the method for determining the dynamic performance of components of the present application, which will not be elaborated here.

[0147] Those skilled in the art can understand that Figure 6The hardware structure shown does not constitute a limitation on this application, and it may include more or fewer components than shown, or combine certain components, or have a different component arrangement.

[0148] Fourthly, an embodiment of this application further provides a computer-readable storage medium.

[0149] A component dynamic performance determination program is stored on the computer-readable storage medium of this application. When the component dynamic performance determination program is executed by a processor, the steps of the component dynamic performance determination method as described above are implemented.

[0150] Among them, the method implemented when the component dynamic performance determination program is executed can refer to the various embodiments of the component dynamic performance determination method of this application, which will not be elaborated here.

[0151] It should be noted that the serial numbers of the above embodiments of this application are only for description and do not represent the superiority or inferiority of the embodiments.

[0152] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices. The descriptions of terms such as "first", "second", and "third" are used to distinguish different objects, etc., and do not represent a sequential order, nor do they limit that "first", "second", and "third" are of different types.

[0153] In the description of the embodiments of this application, "exemplary", "for example", or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "for instance" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example", or "for instance" is intended to present relevant concepts in a specific manner.

[0154] In the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; "and / or" in the text is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0155] In some of the processes described in the embodiments of the present application, multiple operations or steps appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0156] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal device to execute the methods described in the various embodiments of the present application.

[0157] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for determining the dynamic performance of components, characterized in that The method for determining the dynamic performance of the component parts includes: Removing the static offset from the original acceleration output by the vibration measuring instrument to obtain the first acceleration. Herein, the acceleration sensor of the vibration measuring instrument is fixed on the component part to be measured, and an exciter is also fixed on the component part to be measured, and the exciter is used to apply excitation to the component part to be measured; Performing non-linear distortion elimination processing on the first acceleration to obtain the second acceleration; Performing data analysis and processing based on the second acceleration to obtain the mode and vibration mode of the component part to be measured.

2. The method for determining the dynamic performance of parts as described in claim 1, wherein The static offset is the acceleration output by the vibration measuring instrument when the component part to be measured is in a vibration-free state.

3. The method for determining the dynamic performance of parts according to claim 2, wherein After removing the static offset from the original acceleration output by the vibration measuring instrument to obtain the first acceleration, it further includes: When the first acceleration is zero and the duration reaches the preset duration, stop the operation of the vibration measuring instrument.

4. The method for determining the dynamic performance of components according to claim 1, characterized in that, The performing non-linear distortion elimination processing on the first acceleration to obtain the second acceleration includes: Calculating the ratio of the first acceleration to the g response at the position, and using the ratio as the second acceleration, wherein the g response at the position is the acceleration response of the acceleration sensor under the action of gravity at its installation position.

5. The method for determining the dynamic performance of parts according to claim 1, characterized in that, Performing data analysis and processing based on the second acceleration to obtain the mode and vibration mode of the component part to be measured includes: Performing convolution processing on the second acceleration to obtain the displacement response of the component part to be measured; Obtaining the frequency response characteristic function of the component part to be measured based on the displacement response; Obtaining the mode and vibration mode of the component part to be measured based on the frequency response characteristic function.

6. The method for determining the dynamic performance of parts according to claim 5, wherein Obtaining the frequency response characteristic function of the component part to be measured based on the displacement response includes: Performing fast Fourier transform on the displacement response to obtain the frequency response characteristic function of the component part to be measured.

7. The method for determining the dynamic performance of parts according to claim 5, characterized in that, Obtaining the mode and vibration mode of the component part to be measured based on the frequency response characteristic function includes: Taking the first derivative of the frequency response characteristic function to obtain the mode and vibration mode of the component part to be measured.

8. An apparatus for determining the dynamic performance of a component, characterized in that, The device for determining the dynamic performance of the component parts includes: The first denoising module is used to remove the static offset from the original acceleration output by the vibration measuring instrument to obtain the first acceleration. Herein, the acceleration sensor of the vibration measuring instrument is fixed on the component part to be measured, and an exciter is also fixed on the component part to be measured, and the exciter is used to apply excitation to the component part to be measured; The second denoising module is used to perform non-linear distortion elimination processing on the first acceleration to obtain the second acceleration; The analysis module is used to perform data analysis and processing based on the second acceleration to obtain the mode and vibration mode of the component part to be measured.

9. A component dynamic performance determination device, characterized in that, The device for determining the dynamic performance of the component parts includes a processor, a memory, and a program for determining the dynamic performance of the component parts stored on the memory and executable by the processor. When the program for determining the dynamic performance of the component parts is executed by the processor, the steps of the method for determining the dynamic performance of the component parts as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that, A computer-readable storage medium stores a program for determining the dynamic performance of the component parts. When the program for determining the dynamic performance of the component parts is executed by a processor, the steps of the method for determining the dynamic performance of the component parts as described in any one of claims 1 to 7 are implemented.

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