Vehicle modal test method, system and device and storage medium

Abstract

The embodiment of the invention provides a vehicle modal test method, system and device and a storage medium, and relates to the technical field of rail transit. The method comprises the steps of calculating a rubber-metal pad vibration isolation frequency required for supporting a tested vehicle according to the mass of the tested vehicle and a first-order elastic modal frequency, and obtaining the supporting rigidity required by the rubber-metal pad according to the vibration isolation frequency, so as to support the tested vehicle through the rubber-metal pad meeting the supporting rigidity; determining a test section of the tested vehicle, performing test point arrangement and excitation point position determination on the test section, and configuring a vibration exciter and an acceleration sensor according to the test points and the excitation points; and recording time domain data of the force signal of each excitation point and the acceleration signal of each test point, and completing modal test of the tested vehicle. According to the method provided by the invention, the rubber pier type selection is made according to the vibration isolation parameters of the rubber pile, so that each tested vehicle can select a proper support, and the precision of a test result is ensured.

Description

Technical Field

[0001] The present application relates to the field of rail transit technology, and in particular, to a vehicle modal testing method, system, device and storage medium. Background Art

[0002] With the advancement and development of vehicle technology, passengers have put forward higher requirements for vehicle comfort. The dynamic performance of train operation directly affects vehicle safety and riding comfort. Therefore, vehicle vibration has received more and more attention. Through the modal analysis of car body and bogie, the dynamic characteristics of the vehicle operation process can be studied to guide the optimal design of the vehicle.

[0003] When conducting modal tests, low-rigidity elastic supports are required to ensure that the support method of the test object reaches a nearly free state. In order to achieve a free state during the test, air springs or rubber pile supports are often used.

[0004] However, when using air spring supports, if the air spring supports are too hard or too soft, it will also cause deviation in the natural frequency of the vehicle body, and the stiffness adjustment range is small, making it difficult to control performance parameters when not in a ready state. When testing the vehicle body structure or bogie mode, rubber pile supports are used, but the rubber pile parameters have not been selected and designed. Simulation test comparisons have shown that the vertical stiffness value of the rubber pile has a greater impact on the test results and cannot be adjusted, resulting in the modal test results possibly being the constraint mode of the test object, and the result values ​​cannot be guaranteed to be accurate and reliable. Summary of the invention

[0005] In order to solve one of the above-mentioned technical defects, a vehicle modal testing method, device and storage medium are provided in an embodiment of the present application.

[0006] According to a first aspect of an embodiment of the present application, a vehicle modal testing method is provided, the method comprising:

[0007] According to the mass of the vehicle under test and the first-order elastic modal frequency, the vibration isolation frequency of the rubber pile required for supporting the vehicle under test is calculated, and the support stiffness required by the rubber pile is obtained according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile that meets the support stiffness;

[0008] Determine the test section of the vehicle under test, arrange the measuring points and determine the positions of the excitation points on the test section, and configure the vibration exciter and acceleration sensor according to the measuring points and excitation points;

[0009] The force signal of each excitation point and the time domain data of the acceleration signal of each measuring point are recorded to complete the modal test of the vehicle under test.

[0010] In an optional embodiment of the present application, the step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile meeting the support stiffness, further includes:

[0011] The ratio of the vibration isolation frequency to the first-order elastic modal frequency ranges from 0.125 to 0.2.

[0012] In an optional embodiment of the present application, the step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile meeting the support stiffness, further includes:

[0013] The structural contact area and hardness of the rubber pile are fixed, and the dynamic stiffness and static stiffness of the rubber pile are adjusted accordingly by adjusting the height of the rubber pile. Modal tests are performed on the vehicle under different dynamic stiffness conditions of the rubber pile.

[0014] In an optional embodiment of the present application, the step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile meeting the support stiffness, further includes:

[0015] The rubber stacks are configured as a stacked series structure.

[0016] In an optional embodiment of the present application, the step of recording the time domain data of the force signal of each excitation point and the acceleration signal of each measurement point to complete the modal test of the vehicle under test further includes:

[0017] The modal calculation of vehicle modal test is carried out through multi-point excitation and multi-point measurement method.

[0018] In an optional embodiment of the present application, the step of recording the time domain data of the force signal of each excitation point and the acceleration signal of each measurement point to complete the modal test of the vehicle under test further includes:

[0019] The modal frequencies of vehicle modal tests are calculated using the multi-reference least squares complex frequency domain method.

[0020] According to a second aspect of an embodiment of the present application, a vehicle modal testing system is provided, the system comprising a parameter calculation module, a device configuration module and a modal testing module; wherein,

[0021] A parameter calculation module is used to calculate the vibration isolation frequency of the rubber pile required to support the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtain the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile that meets the support stiffness;

[0022] The device configuration module is used to determine the test section of the vehicle under test, arrange the measuring points and determine the positions of the excitation points on the test section, and configure the vibration exciter and the acceleration sensor according to the measuring points and the excitation points;

[0023] The modal test module is used to record the time domain data of the force signal of each excitation point and the acceleration signal of each measuring point to complete the modal test of the vehicle under test.

[0024] In an optional embodiment of the present application, the parameter calculation module further includes:

[0025] The ratio of the vibration isolation frequency to the first-order elastic modal frequency ranges from 0.125 to 0.2.

[0026] According to a third aspect of an embodiment of the present application, there is provided a computer device, including: a memory;

[0027] A processor; and a computer program; wherein the computer program is stored in a memory and is configured to be executed by the processor to implement a vehicle modal testing method as described in any one of the first aspects of the embodiments of the present application.

[0028] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored; the computer program is executed by a processor to implement a vehicle modal testing method as described in any one of the first aspects of the embodiment of the present application.

[0029] The vehicle modal testing method provided in the embodiment of the present application has the following beneficial effects:

[0030] The present application overcomes the shortcoming of the air spring support form that the pressure cannot be adjusted during the test process by selecting a rubber pile to support the vehicle under test, and can test the vehicle under test under different working conditions based on the structural characteristics of the rubber pile; in addition, the method of the present application formulates the rubber pier selection according to the vibration isolation parameters of the rubber pile, so that each vehicle under test can select a suitable support to ensure the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1A diagram of the hardware system architecture of a modal test for implementing the method provided in an embodiment of the present application;

[0033] Figure 2 A flow chart of a vehicle modal testing method provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the rubber stack structure provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of vertical displacement variation of different rubber piles provided in the embodiments of the present application;

[0036] Figure 5 A schematic diagram of test results provided for the embodiments of the present application;

[0037] Figure 6 A schematic diagram of the location of the rubber pile provided in an embodiment of the present application;

[0038] Figure 7 This is a schematic diagram of obtaining finite element simulation parameters in one embodiment of the present application;

[0039] Figure 8 This is a schematic diagram of the vertical static displacement calculated by finite element simulation in one embodiment of the present application;

[0040] Fig. 9 This is a schematic diagram of a first-order sag frequency test in one embodiment of the present application;

[0041] Fig.10 A structural diagram of a vehicle modal test system provided in an embodiment of the present application;

[0042] Fig.11 A schematic diagram of the computer device structure provided for one embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0044] like Figure 1 As shown, the modal test hardware system in the embodiment of the present application is composed of a force sensor, an acceleration sensor, data acquisition software, a power amplifier, an exciter, a signal generator, a computer workstation and professional analysis software.

[0045] based on Figure 1 The modal testing hardware system shown in the figure, this application proposes a vehicle modal testing method, Figure 2 For a flow chart of the vehicle modal testing method provided in the embodiment of the present application, please refer to Figure 2 :

[0046] S1: According to the mass of the vehicle under test and the first-order elastic modal frequency, the vibration isolation frequency of the rubber pile required to support the vehicle under test is calculated, and the support stiffness required by the rubber pile is obtained according to the vibration isolation frequency, so as to support the vehicle under test through the rubber pile that meets the support stiffness.

[0047] In some embodiments of the present application, the ratio of the vibration isolation frequency to the first-order elastic modal frequency is in the range of 0.125-0.2.

[0048] In the specific implementation, the factors that affect the vehicle modal test results are mainly: the location and connection method of the measuring point, the accuracy of the data acquisition software, and the vehicle body support structure. Compared with the simulation results, it can be seen that the influence of the measuring point location and connection method on the modal test results is <0.5Hz, the influence of the data acquisition software is <0.5Hz, and the influence of different vehicle body support methods on the results is 2Hz. Therefore, it is very necessary to conduct a modal test with higher accuracy, which can effectively ensure the reliability of the results. When conducting modal tests, low-rigidity elastic supports are required to ensure that the support method of the test object reaches a nearly free state.

[0049] In a specific implementation, the formula is applied:

[0050]

[0051] The calculated vibration isolation frequency of the rubber pile is compared with the test data. It can be seen that the ratio of the vibration isolation frequency required to support the test piece to the first-order elastic modal frequency is more reasonable when it is 1 / 8 to 1 / 5 (i.e. 0.125-0.2). At this time, the boundary condition is closer to free constraint and the test result is not affected by the support. In the formula, f is the vibration isolation frequency, K is the dynamic stiffness value of the rubber pile, and m is the mass of the rubber pile.

[0052] In some embodiments of the present application, the structural contact area and hardness of the rubber pile are fixed, and the height of the rubber pile is adjusted to correspondingly adjust the dynamic stiffness and static stiffness of the rubber pile, and modal tests are performed on the tested vehicle under different dynamic stiffness conditions of the rubber pile.

[0053] In the specific implementation, rubber piles with different vertical static stiffness parameters are designed according to the first-order vertical bending vibration frequency range of the existing car body and bogie, so that each object can select appropriate support to ensure the accuracy of the test results. The optional range of the rubber pile is designed according to the existing modal database.

[0054] As a preferred embodiment, considering the uniformity and stability of the force, the rubber pile is composed of a middle rubber and a lower surface steel plate, such as Figure 3As shown, the thickness of the steel plate is designed according to actual needs. Optionally, the thickness of the steel plate is 10 mm or 30 mm.

[0055] In some embodiments of the present application, the rubber stacks are configured as a stacked series structure.

[0056] In the specific implementation, the parameters are determined according to the stiffness test principle: the static stiffness value of the rubber pile (N / mm), where ΔF is the test load value and ΔS is the displacement of the rubber pile. When the mass of the vehicle or bogie is special and exceeds the existing rubber pile selection range, it can be used in series, and the reliability has been verified by simulation. This application provides an embodiment as follows:

[0057] A finite element mesh model of a rubber pile was established: with a diameter of 40 cm, heights of 30 cm and 60 cm respectively, 10 mm steel plates were set on the top and bottom, and a rubber layer in the middle. The static analysis structure was used to analyze the displacement and simulate the vertical load during the modal test of a certain vehicle model. The pressure value was 0.1638 MPa, and the rubber used the elastic fitting coefficient corresponding to the Mooney-Rivlin model.

[0058] It can be seen that when the rubber is stacked, it becomes twice as much as before, so the static stiffness becomes 1 / 2 times as much as before, such as Figure 4 As shown, the superposition method can expand the stiffness selection range to meet the testing requirements of special vehicle models. Figure 3 Represents a single rubber pile, Figure 4 For the general Figure 3 The single rubber stack shown is used, i.e. Figure 4 The size of each rubber pile is Figure 3 same.

[0059] Please continue to see Figure 2 :

[0060] S2: Determine the test section of the vehicle under test, arrange the measuring points and determine the positions of the excitation points on the test section, and configure the vibration exciter and acceleration sensor according to the measuring points and excitation points.

[0061] In the specific implementation, the rubber pier is selected according to the mass of the tested object and the vibration isolation parameters of the rubber pile, and the tested object is placed on the rubber pier; the test section and the measurement point layout are determined, and the measurement point layout and selection points can reflect the overall vibration mode of the tested object; the excitation point position is determined, the exciter and the acceleration sensor are installed, and the connection method between the acceleration sensor and the tested object is determined by the structural analysis frequency; the line is connected, the modal test software is opened, the test model is established and the parameters are set.

[0062] S3: Record the time domain data of the force signal of each excitation point and the acceleration signal of each measuring point to complete the modal test of the vehicle under test.

[0063] In some embodiments of the present application, modal calculation of the vehicle modal test is performed by a multi-point excitation and multi-point measurement method, and modal frequency calculation of the vehicle modal test is performed by a multi-reference least squares complex frequency domain method.

[0064] In specific implementation, a more accurate mode can be obtained through the multi-point excitation multi-point measurement (MIMO) method. The MIMO frequency response function formula is:

[0065]

[0066] Where H1(f) is the frequency response function matrix, G XF (f) is the cross power spectrum density matrix of the excitation input and the response output, G FF (f) is the power spectrum density matrix of the excitation input.

[0067] The modal frequencies are then determined using a multi-reference least squares complex frequency domain method.

[0068] Furthermore, in a specific implementation, the parameter identification process in the actual modal test process is as follows:

[0069] Step 1: Model building

[0070] 1. Open the software, enter the measurement point number and coordinates, and establish a simplified geometric model of the test piece;

[0071] 2. Set the channel, select the test direction of the sensor in the corresponding channel, and set parameters such as sensitivity;

[0072] 3. Associate the channel with the corresponding measurement point on the geometric model.

[0073] Step 2: Parameter Setting

[0074] 1. Determine the sensor range by oscilloscope;

[0075] 2. Define the input signal, bandwidth, frequency resolution, average times and other parameters in the parameter setting interface.

[0076] Step 3: Data Collection

[0077] 1. Check whether the sensor is loose before starting the test;

[0078] 2. Check whether there is obvious vibration in the surrounding environment that affects the test;

[0079] 3. Collect data according to working conditions.

[0080] Step 4: Data processing

[0081] Process the collected test data and view the test results, such as Figure 5 shown.

[0082] Step 5: Disassemble the device.

[0083] In summary, the method proposed in this application is designed based on vibration isolation theory and combined with simulation analysis to obtain the first-order elastic body modal frequency, so as to select a suitable rubber pile as a support for testing and ensure high modal test accuracy.

[0084] Furthermore, the present application proposes an example to explain in detail the method proposed in the embodiment of the present application:

[0085] It is known that the weight of the tested vehicle body structure is 8.4t, and the ratio of the vibration isolation frequency of the support to the first-order elastic modal frequency is in the range of 1 / 8 to 1 / 5. The first-order elastic body frequency of the tested structure is 16.1Hz through finite element simulation. The value here is 1 / 5, so the vibration isolation design frequency of the support is calculated to be 1 / 5 of 16.1, which is 3.22Hz, and the support stiffness parameters of the rubber pile are then deduced.

[0086] The proof that the ratio range is approximately free mode in the range of 1 / 8 to 1 / 5 is obtained through finite element simulation calculation. The rule is as follows:

[0087] Table 1 Influence of support stiffness on bending mode of the tested piece

[0088]

[0089] In the above table, the free working condition is the simulation working condition, and the first-order vertical bending modal frequency of the vehicle body is calculated without the rubber pile support. The vibration isolation frequency 1-13Hz is the vibration isolation frequency of the rubber pile used for supporting the vehicle body during the modal test. It is a parameter of the rubber pile, which is converted into stiffness application in the simulation analysis and can be adjusted according to the design requirements. The values ​​in the second row are the first-order vertical bending modal frequencies corresponding to different vibration isolation frequencies. The values ​​in the third row are when the vibration isolation frequency of the rubber pile reaches a certain value, two first-order vertical bending vibration modes appear.

[0090] Specifically, the ideal boundary during modal testing is the free working condition. Considering the actual engineering problems, the stiffness of the supporting rubber pile should be as small as possible, which is closer to the free working condition. However, when the stiffness value is too low, the vertical displacement of the supporting structure will be too large and the test device will be unstable. Therefore, it is more reasonable to select the vibration isolation frequency of 2Hz<<4Hz. As can be seen from the above table, when the rubber pile vibration isolation frequency is selected as 2Hz and 4Hz, the corresponding modal frequencies are 16.14Hz and 16.28Hz respectively, and there will be no two vertical bending frequencies. The error with the free modal frequency 16.10 is within 1%, and the ratio of the vibration isolation frequency to it is rounded to 1 / 8~1 / 5.

[0091] like Figure 6As shown in the figure, when the vibration isolation frequency is less than 4Hz, the first-order bending frequency of the vehicle body is 16.28Hz, which is close to the free working mode of 16.10Hz. Considering that the sound insulation frequency is too low in engineering applications, the rubber structure will produce large deformation, so the ratio of the vibration isolation frequency of the support to the first-order elastic mode frequency is in the range of 1 / 8 to 1 / 5.

[0092] The vehicle body structure is supported by four rubber piles for stability; each rubber pile bears a weight of 8400*9.8 / 4=20580N, and the vibration isolation frequency is 3Hz.

[0093] Given a rubber pile with a mass of 2.1t and f=3Hz, the formula The dynamic stiffness K=746N / mm is obtained.

[0094] The rubber pile structure can be designed according to the dynamic stiffness value of a rubber pile, which includes three variables: the diameter of the rubber pile, the height of the rubber pile, and the hardness of the rubber pile. Among the three parameters, the diameter of the rubber pile is 40 cm considering the minimum contact area of ​​the structure, and the hardness is usually 50 Shore A. The height of the rubber pile is used as a parameter variable, which is a single variable for changing the dynamic stiffness design.

[0095] Both dynamic stiffness and static stiffness are linearly related to displacement

[0096] Stiffness is the relationship between force and deformation. When a fixed load is loaded slowly, the relationship between the force and deformation of the rubber pile is measured as static stiffness. When an alternating load is loaded at a certain frequency, the relationship between the force and deformation of the rubber pile is measured as dynamic stiffness. The two are different.

[0097] K d Represents dynamic stiffness, K s represents the static stiffness, It’s called the static-dynamic ratio, and is one of the properties of a rubber pile.

[0098] Stress tensor invariant C in finite element simulation 10 and C 01 The rubber parameters are predicted by the Mooney-Rivlin model, such as Figure 7 shown.

[0099] Finite element simulation obtains displacement, and then derives static stiffness value, and designs corresponding parameters and structures, such as Figure 8 , as shown in Table 2.

[0100] Table 2 Design parameters corresponding to the rubber pier structure

[0101]

[0102] In the above table, when the first-order vertical bending modal frequency of the test vehicle body is known, the vibration isolation frequency is first selected according to the relationship of 1 / 8 to 1 / 5. The derivation process has been explained above. The vibration isolation frequency is the formula The value in is, m is the mass of the vehicle body used, 2.1t is taken in this case, and K obtained by the formula is the dynamic stiffness value.

[0103] The dynamic-static ratio is a property of the rubber pile, and the cylindrical shape can usually be selected from 1.2 to 1.8.

[0104] The static stiffness can be obtained according to the static-dynamic ratio. With the static stiffness and the static-dynamic ratio, the rubber pile can be made.

[0105] The rubber pile diameter D, height H, and steel plate thickness T can be designed according to the actual engineering application. They cannot be too high or too thin, which will affect the test safety. In this case, only the height is used as a variable. Then the upper platen area is

[0106] The mass of the vehicle body is multiplied by the gravitational acceleration g to get the weight G, which is evenly loaded on four rubber piles. Each rubber pile bears a load of G / 4. The load is divided by the above pressure plate area to get the pressure, in MPa.

[0107] When establishing a simulation verification model for a rubber pile, the rubber parameters corresponding to the diameter, stiffness, steel plate thickness, hardness, and dynamic stiffness are required as inputs. The upper pressure plate applies force to check the displacement results of the rubber pile, which must be within a reasonable range.

[0108] Taking the safety of the test into consideration, the rubber pile cannot be too high or too thin, and the deformation cannot be too large. Therefore, the diameter and hardness of the rubber pile are specified, and the height is used as the only adjustable variable to affect the displacement, that is, the deformation of the rubber pile. The displacement is not a rigid requirement and can be within a reasonable range.

[0109] According to the first-order vertical bending vibration frequency range of the existing car body and bogie, rubber piles with different vertical static stiffness parameters are designed, which allows each object to select appropriate supports and ensure the accuracy of the test results. The optional range of the rubber pile is designed according to the existing modal database. When it exceeds the optional range of the rubber pile, it can be used in series to meet the testing requirements of all vehicle models.

[0110] For the 8.4t aluminum alloy body, a 4-point support structure can be selected, with a rubber pile height of 30cm (upper and lower steel plates of 10mm) and a rubber hardness of 50 Shore A. The series structure of the rubber pile can be selected for different test parts.

[0111] The test device includes a vehicle body structure (tested vehicle), an elastic support structure, an accelerometer, an exciter, a power amplifier, data acquisition software, and a computer workstation. The simulation results are compared with the laboratory test results. Fig. 9 The results are basically consistent

[0112] It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0113] See also Fig.10 An embodiment of the present application provides a vehicle modal test system, which includes a parameter calculation module 10, a device configuration module 20 and a modal test module 30; wherein,

[0114] The parameter calculation module 10 is used to calculate the vibration isolation frequency of the rubber pile required to support the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtain the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile that meets the support stiffness;

[0115] The device configuration module 20 is used to determine the test section of the vehicle under test, arrange the measuring points and determine the positions of the excitation points on the test section, and configure the vibration exciter and the acceleration sensor according to the measuring points and the excitation points;

[0116] The modal test module 30 is used to record the time domain data of the force signal of each excitation point and the acceleration signal of each measurement point to complete the modal test of the vehicle under test.

[0117] In some embodiments of the present application, the parameter calculation module further includes: a ratio of the vibration isolation frequency to the first-order elastic modal frequency is in the range of 0.125-0.2.

[0118] For the specific definition of the above-mentioned vehicle modal test system, please refer to the definition of the vehicle modal test method above, which will not be repeated here. Each module in the above-mentioned vehicle modal test system can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0119] In one embodiment, a computer device is provided, the internal structure diagram of which can be as follows: Fig.11As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above vehicle modal test method is implemented. It includes: a memory and a processor, the memory stores a computer program, and the processor implements the above vehicle modal test method when executing the computer program.

[0120] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above vehicle modal testing method can be implemented.

[0121] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, C language, VHDL language, Verilog language, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of the systems and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0125] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0126] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A vehicle modal testing method, characterized in that: include: Calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile that meets the support stiffness; Determine the test section of the vehicle under test, arrange the measuring points and determine the positions of the excitation points on the test section, and configure the vibration exciter and the acceleration sensor according to the measuring points and the excitation points; The force signal of each of the excitation points and the time domain data of the acceleration signal of each of the measuring points are recorded to complete the modal test of the vehicle under test.

2. The vehicle modal testing method according to claim 1, characterized in that: The step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile satisfying the support stiffness, further includes: The ratio of the vibration isolation frequency to the first-order elastic modal frequency is in the range of 0.125-0.

2.

3. The vehicle modal testing method according to claim 1 or 2, characterized in that: The step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile satisfying the support stiffness, further includes: The structural contact area and hardness of the rubber pile are fixed, and the dynamic stiffness and static stiffness of the rubber pile are correspondingly adjusted by adjusting the height of the rubber pile, and a modal test is performed on the vehicle under different dynamic stiffness conditions of the rubber pile.

4. The vehicle modal testing method according to claim 3, characterized in that: The step of calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile satisfying the support stiffness, further includes: The rubber stacks are configured as a stacked series structure.

5. The vehicle modal testing method according to claim 1, characterized in that: The step of recording the time domain data of the force signal of each of the excitation points and the acceleration signal of each of the measurement points to complete the modal test of the vehicle under test also includes: The modal calculation of the vehicle modal test is performed by a multi-point excitation and multi-point measurement method.

6. The vehicle modal testing method according to claim 5, characterized in that: The step of recording the time domain data of the force signal of each of the excitation points and the acceleration signal of each of the measurement points to complete the modal test of the vehicle under test also includes: The modal frequency calculation of the vehicle modal test is performed using a multi-reference least squares complex frequency domain method.

7. A vehicle modal testing system, characterized in that: include: Parameter calculation module, device configuration module and modal test module; among them, a parameter calculation module, for calculating the vibration isolation frequency of the rubber pile required for supporting the vehicle under test according to the mass of the vehicle under test and the first-order elastic modal frequency, and obtaining the support stiffness required by the rubber pile according to the vibration isolation frequency, so as to support the vehicle under test by the rubber pile that meets the support stiffness; A device configuration module, used to determine a test section of the vehicle under test, arrange measuring points and determine the positions of excitation points on the test section, and configure a vibration exciter and an acceleration sensor according to the measuring points and the excitation points; The modal test module is used to record the time domain data of the force signal of each excitation point and the acceleration signal of each measurement point to complete the modal test of the vehicle under test.

8. The vehicle modal testing system according to claim 7, characterized in that: The parameter calculation module also includes: The ratio of the vibration isolation frequency to the first-order elastic modal frequency is in the range of 0.125-0.

2.

9. A computer device, characterized in that: include: Memory; processor; as well as Computer programs; The computer program is stored in the memory and is configured to be executed by the processor to implement the vehicle modal testing method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon; the computer program is executed by a processor to implement the vehicle modal testing method according to any one of claims 1 to 6.

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