Power assembly suspension system rigid body modal data testing method and device

Abstract

The application relates to the field of automobile NVH performance, and discloses a power assembly suspension system rigid body modal data testing method and device, which comprises the following steps: acquiring frequency response testing data in a specified direction, wherein the frequency response testing data comprises collection data of multiple collection points, and the collection positions of the multiple collection points comprise a driving side and a suspension passive side; selecting several alternative peak frequencies from the frequency response testing data; acquiring phase information of the alternative peak frequencies; determining the alternative peak frequencies in a preset phase position range as modal frequencies; acquiring phase comparison information of each collection point at the modal frequencies; determining a modal direction of the modal frequencies according to the phase comparison information; and generating modal data of the power assembly suspension system at the modal frequencies. The application can exclude the interference of the surrounding environment of the power assembly, and improve the measurement accuracy of the suspension modal data.

Description

Technical Field

[0001] This invention relates to the field of automotive NVH performance, and more particularly to a method and apparatus for testing rigid body modal data of powertrain mounting systems. Background Technology

[0002] The mounting system is used to secure the automotive powertrain, and the rigid body modes of the powertrain mounting system are important reference indicators for automotive NVH performance (Noise, Vibration, and Harshness) design. Obtaining the rigid body modes of the powertrain mounting system requires measuring the powertrain's vibration data. However, the modal decoupling rate, modal frequencies, and frequency misalignment with other systems in the vehicle have a significant impact on the vibration data of the mounting system, thus affecting the accuracy of the powertrain mounting system rigid body modal data. Summary of the Invention

[0003] Therefore, it is necessary to provide a method and apparatus for testing rigid modal data of powertrain mounting system in order to eliminate interference from the surrounding environment of the powertrain and improve the measurement accuracy of rigid modal data of powertrain mounting system.

[0004] A method for testing rigid body modal data of a powertrain mounting system includes:

[0005] Acquire frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0006] Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve.

[0007] The phase information of the candidate peak frequencies is obtained, and the candidate peak frequencies whose phase information is within a preset phase position range are determined as modal frequencies;

[0008] The phase comparison information of each acquisition point at the modal frequency is acquired, the modal direction of the modal frequency is determined based on the phase comparison information, and modal data of the powertrain mounting system at the modal frequency is generated.

[0009] A rigid body modal data testing device for a powertrain mounting system, comprising:

[0010] The frequency response data acquisition module is used to acquire frequency response test data in a specified direction. The frequency response test data includes data acquired from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0011] The peak frequency selection module is used to select several candidate peak frequencies from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve.

[0012] The modal frequency determination module is used to obtain the phase information of the candidate peak frequencies and determine the candidate peak frequencies whose phase information is within a preset phase position range as modal frequencies.

[0013] A modal data generation module is used to acquire phase comparison information of each acquisition point at the modal frequency, determine the modal direction of the modal frequency based on the phase comparison information, and generate modal data of the powertrain mounting system at the modal frequency.

[0014] A vehicle optimization method uses modal data generated by any of the above-mentioned powertrain mounting system rigid body modal data testing methods.

[0015] A car, wherein the car has been optimized by the aforementioned car optimization method.

[0016] The aforementioned powertrain mounting system rigid body modal data testing method, apparatus, vehicle optimization method, and vehicle acquire frequency response test data in a specified direction. This frequency response test data includes data collected from multiple points, with the collection points located on both the active and passive sides of the mounting system. This ensures sufficient test data, including passive side test data, to eliminate passive side interference with the powertrain mounting system's rigid body modes. Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of each candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude on the passive side frequency response curve. By comparing the amplitudes on the active and passive sides, interference from passive side vibrations can be eliminated. The phase information of the candidate peak frequencies is acquired, and candidate peak frequencies whose phase information falls within a preset phase position range are determined as modal frequencies. Here, through phase position analysis, peak frequencies that cause interference can be eliminated. Phase comparison information from each acquisition point at the modal frequency is acquired. The modal direction at the modal frequency is determined based on this phase comparison information, and modal data of the powertrain mounting system at that frequency is generated. Here, by comparing the phases at different acquisition points, the modal direction can be clearly identified, thereby obtaining accurate modal data. This invention can eliminate interference from the surrounding environment of the powertrain mounting system and improve the measurement accuracy of the mounting modal data. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating a method for testing rigid body modal data of a powertrain mounting system according to an embodiment of the present invention;

[0019] Figure 2 This is a Bode plot of frequency response test data from four acquisition points on the active side in one embodiment of the present invention;

[0020] Figure 3 This is a Bode plot of frequency response test data from two acquisition points on the active side and two acquisition points on the passive side in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of a rigid body modal data testing device for a powertrain suspension system according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of a computer device according to an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In one embodiment, such as Figure 1 As shown, a method for testing rigid body modal data of a powertrain mounting system is provided, including the following steps S10-S40.

[0025] S10. Obtain frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points. The acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0026] Understandably, the powertrain mounting system rigid body modal data testing method provided in this embodiment can be used to obtain modal data of an automotive powertrain mounting system. The specified direction can refer to the direction of the force applied to the powertrain. Specified directions include, but are not limited to, the X-axis, Y-axis, and Z-axis directions. In one example, using the vehicle coordinate system as a reference: the X-axis points to the rear of the vehicle and is perpendicular to the front axle; the Z-axis is vertically upward; and the Y-axis is determined according to the right-hand rule. In some cases, the specified direction can be defined according to actual needs.

[0027] Frequency response test data is collected from multiple sampling points. These sampling points can be set on the active side (including the powertrain and active suspension side) and the passive suspension side. The active suspension side refers to the side used to mount the powertrain; the passive suspension side refers to the side used to mount the chassis. Frequency response test data can be represented using a Bode plot. Figure 2 As shown, Figure 2 This is a Bode plot of the frequency response test data from four sampling points on the active side. Curve L1 is sampled from the left active suspension side; curve L2 from the right active suspension side; curve L3 from the lower front of the powertrain; and curve L4 from the active control arm (lower rear of the powertrain). Figure 3 As shown, Figure 3 This is a Bode plot of the frequency response test data from two sampling points on the active side and two sampling points on the passive side. Specifically, curve L1 is sampled from the left suspended active side; curve L2 is sampled from the right suspended active side; curve L5 is sampled from the left suspended passive side; and curve L6 is sampled from the right suspended passive side.

[0028] S20. Select several candidate peak frequencies from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve.

[0029] Understandably, several candidate peak frequencies can be selected from the frequency response test data. Here, the first amplitude of the candidate peak frequency on the active-side frequency response curve is greater than twice the second amplitude on the passive-side frequency response curve. That is, if there are significant peaks on both the active and passive sides at a certain frequency, the first peak value on the active-side frequency response curve must be significantly greater than the second peak value on the passive-side frequency response curve. Otherwise, this frequency is not a modal frequency of the powertrain mounting system and needs to be eliminated. Figure 3 As shown, the peak values ​​P0 near 2.5Hz and P1 near 5.20Hz have essentially the same first amplitude on the active-side frequency response curve and second amplitude on the passive-side frequency response curve, therefore they need to be excluded. Figure 3In the example, the selected candidate peak frequencies include the frequencies corresponding to peak values ​​P2 to P5.

[0030] S30. Obtain the phase information of the candidate peak frequency, and determine the candidate peak frequency whose phase information is within a preset phase position range as the modal frequency.

[0031] Understandably, phase information can be used to determine whether a candidate peak frequency is a modal frequency. The preset phase position range is related to the location of the sampling point and the modal direction. In most cases, the preset phase position range can be set so that the phase of the candidate peak frequency is around 90° or -90°. Therefore, for most candidate peak frequencies, if their phase is around 90° or -90°, the candidate peak frequency can be determined to be a modal frequency.

[0032] exist Figure 2 In the example, the phases of peak P3 near 10.7Hz and peak P4 near 12.20Hz are not near 90° or -90°. Therefore, it can be determined that the frequencies corresponding to peaks P3 and P4 are not modal frequencies. By eliminating these possibilities... Figure 2 The modal frequencies in the data include the frequencies corresponding to the peak values ​​P2 and P5.

[0033] In some special cases, the sampling point is set on the axis of the excitation direction. In this case, the phase of the rotational modal frequency obtained from that sampling point is not near 90° or -90°. Therefore, a preset phase position range different from other alternative peak frequencies can be set, such as [-180°, 180°]. Figure 2 As shown, the sampling position of curve L3 is slightly below the front of the powertrain; the sampling position of curve L4 is on the active side of the linkage (slightly below the rear of the powertrain), and the frequency corresponding to the peak value P5 is the rotational mode frequency. Therefore, the phase of L3 and L4 at position P5 is not near 90° or -90°.

[0034] S40. Acquire phase comparison information of each acquisition point at the modal frequency, determine the modal direction of the modal frequency based on the phase comparison information, and generate modal data of the powertrain mounting system at the modal frequency.

[0035] Understandably, after determining the modal frequency, the modal direction of the modal frequency can be determined based on the phase comparison information of each acquisition point at the modal frequency. The phase comparison information includes the phase data of each acquisition point (each acquisition point corresponds to a frequency response curve) at the modal frequency. In one example, the phase comparison information can be represented as: L1: 90°; L2: 90°; L3: 90°; L4: 90°; L5: 90°; L6: 90°.

[0036] Different phase comparison information generally results in different modal directions for the corresponding modal frequencies. For example, in phase comparison information, if the phases of all acquisition points are the same, then the modal direction of that modal frequency is the same as the current excitation direction. Specifically, if the excitation direction is the X-axis direction, then if the phases of all acquisition points are the same, the modal direction of that modal frequency is the X-axis direction.

[0037] After determining the modal orientation of the modal frequency, modal data suspended at the modal frequency can be generated. In some examples, the modal data includes, but is not limited to, the modal frequency and modal orientation, as well as the amplitude data at that modal frequency.

[0038] In steps S10-S40, frequency response test data in a specified direction is acquired. This test data includes data from multiple acquisition points, located on both the active and passive sides of the suspension system, to obtain sufficient test data, including passive side test data. This helps to eliminate passive side interference with the powertrain suspension system modes. Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of each candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude on the passive side frequency response curve. Here, by comparing the amplitudes on the active and passive sides, interference from passive side vibrations can be eliminated. The phase information of the candidate peak frequencies is acquired. Candidate peak frequencies whose phase information falls within a preset phase position range are determined as modal frequencies. Here, by analyzing the phase position, peak frequencies that cause interference can be eliminated. Phase comparison information at each acquisition point at the modal frequency is acquired. The modal direction at the modal frequency is determined based on the phase comparison information, and modal data of the powertrain mounting system at the modal frequency is generated. Here, by comparing the phases at different acquisition points, the direction of the mode can be clearly identified, thereby obtaining accurate modal data. This embodiment can eliminate interference from the surrounding environment of the powertrain mounting system, improving the measurement accuracy of the rigid body modal data of the powertrain mounting system.

[0039] Optionally, the active side includes a powertrain and a suspension active side; wherein the number of collection points set on the active side is not less than 4, and the number of collection points set on the suspension active side is at least 1.

[0040] Understandably, sampling points can be set on both the active side and the passive side of the suspension. The active side includes the powertrain and the active side of the suspension. When an excitation is applied to the powertrain, the powertrain vibrates. This vibration is first transmitted to the active side of the suspension, and then to the passive side of the suspension. Therefore, the powertrain and the active side of the suspension are considered active sides. The number of sampling points set on the active side should be no less than four. Ideally, each sampling point should be located in multiple directions around the powertrain. For example, one sampling point can be set on each side of the powertrain, one slightly below the front of the powertrain (relative to the center of gravity of the powertrain), and one slightly below the rear of the powertrain (relative to the center of gravity of the powertrain).

[0041] A sampling point can be set on the suspended passive side. The frequency response test data collected by the sampling point on the suspended passive side can be used to identify the frequency of spurious modes.

[0042] Optionally, after step S40, i.e., after acquiring the phase comparison information of each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating the modal data of the powertrain mounting system at the modal frequency, the method further includes:

[0043] S50. Generate a specified number of modal data based on frequency response test data from multiple specified directions.

[0044] Understandably, multiple specified directions include, but are not limited to, the X-axis, Y-axis, and Z-axis. Obtaining frequency response test data for each specified direction typically requires multiple tests to obtain multiple sets of test data. In one example, the frequency response test data for a specified direction can be the average of multiple sets of test data, and the number of tests is no less than 5.

[0045] The number of modal data points can be set according to actual needs. In one example, the number of modal data points can be 6, namely X mode, Y mode, Z mode, RX mode, RY mode, and RZ mode.

[0046] Optionally, before step S10, i.e., before acquiring frequency response test data in a specified direction, the frequency response test data including data from multiple acquisition points, the acquisition locations of the multiple acquisition points including the active side and the suspended passive side, further includes:

[0047] S11. Apply the excitation in the specified direction to the powertrain and acquire the collected data through a sensor installed at the acquisition point.

[0048] Understandably, a specified direction of excitation can be applied to the powertrain. This specified direction can be set according to actual needs. In some examples, the specified direction includes, but is not limited to, the X-axis, Y-axis, and Z-axis directions. The sensor can be an acceleration sensor.

[0049] Specifically, an excitation in a specified direction is applied to the powertrain, causing it to vibrate. This vibration is transmitted to various data collection points, where sensors detect the vibration and generate collected data.

[0050] Optionally, the preset phase position range includes and This is the allowable phase deviation.

[0051] Understandably, the preset phase position range includes and That is, the preset phase position range is The allowable phase deviation can be set according to actual needs. In one example, It can be 5°.

[0052] Optionally, step S40, namely acquiring phase comparison information of each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating modal data of the powertrain mounting system at the modal frequency, includes:

[0053] S401. If the phase of each acquisition point at the modal frequency is the same, then the modal direction of the modal frequency is the same as the specified direction.

[0054] S402. If at least two acquisition points set along the first direction have a phase difference at the modal frequency, and at least two acquisition points set along the second direction have the same phase at the modal frequency, then the modal direction of the modal frequency is the rotation direction of the second direction.

[0055] S403. If at least two acquisition points set along the first direction have the same phase at the modal frequency, and at least two acquisition points set along the second direction have a different phase at the modal frequency, then the modal direction of the modal frequency is the rotation direction of the first direction.

[0056] Understandably, when the specified direction is the X-axis, the first direction can refer to the Z-axis, and the second direction can refer to the Y-axis. If the phases of all acquisition points at the modal frequency are the same, then the modal direction of that modal frequency is the X-axis, i.e., that modal frequency is the X-mode. If at least two acquisition points set along the Z-axis have a phase difference at the modal frequency (e.g., the phases of the upper and lower acquisition points are opposite), and at least two acquisition points set along the Y-axis have the same phase at the modal frequency (e.g., the phases of the left and right acquisition points are the same), then the modal direction of that modal frequency is the rotation direction along the Y-axis, i.e., that modal frequency is the RY-mode. If at least two acquisition points set along the Z-axis have the same phase at the modal frequency (e.g., the phases of the upper and lower acquisition points are the same), and at least two acquisition points set along the Y-axis have a phase difference at the modal frequency (e.g., the phases of the left and right acquisition points are opposite), then the modal direction of that modal frequency is the rotation direction along the Z-axis, i.e., that modal frequency is the RZ-mode.

[0057] When the specified direction is the Y-axis, the first direction can refer to the Z-axis, and the second direction can refer to the X-axis. If the phases of all acquisition points at the modal frequency are the same, then the modal direction of that modal frequency is the Y-axis, meaning that the modal frequency is the Y-mode. If at least two acquisition points set along the Z-axis have a phase difference at the modal frequency (e.g., the phases of upper and lower acquisition points are opposite), and at least two acquisition points set along the X-axis have the same phase at the modal frequency (e.g., the phases of front and rear acquisition points are the same), then the modal direction of that modal frequency is the rotation direction along the X-axis, meaning that the modal frequency is the RX mode. If at least two acquisition points set along the Z-axis have the same phase at the modal frequency (e.g., the phases of upper and lower acquisition points are the same), and at least two acquisition points set along the X-axis have a phase difference at the modal frequency (e.g., the phases of front and rear acquisition points are opposite), then the modal direction of that modal frequency is the rotation direction along the Z-axis, meaning that the modal frequency is the RZ mode.

[0058] When the specified direction is the Z-axis, the first direction can refer to the X-axis, and the second direction can refer to the Y-axis. If the phases of all acquisition points at the modal frequency are the same, then the modal direction of that modal frequency is the Z-axis, meaning that the modal frequency is the Z-mode. If at least two acquisition points set along the X-axis have a phase difference at the modal frequency (e.g., the phases of front and rear acquisition points are opposite), and at least two acquisition points set along the Y-axis have the same phase at the modal frequency (e.g., the phases of left and right acquisition points are the same), then the modal direction of that modal frequency is the rotation direction along the Y-axis, meaning that the modal frequency is the RY-mode. If at least two acquisition points set along the X-axis have the same phase at the modal frequency (e.g., the phases of front and rear acquisition points are the same), and at least two acquisition points set along the Y-axis have a phase difference at the modal frequency (e.g., the phases of left and right acquisition points are opposite), then the modal direction of that modal frequency is the rotation direction along the X-axis, meaning that the modal frequency is the RX-mode.

[0059] Optionally, step S40, namely acquiring phase comparison information of each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating modal data of the powertrain mounting system at the modal frequency, includes:

[0060] S404. Calculate the dynamic image of each modal frequency and generate the mode shape of the modal frequency;

[0061] S405. Generate the modal data based on the modal frequency, the modal direction, and the modal shape.

[0062] Understandably, after determining the modal frequencies and their modal directions, a dynamic image of the modal frequencies can be calculated, the morphology of the modal vibration can be analyzed, and the corresponding mode shapes can be obtained. A mode shape can refer to the morphology of each modal vibration. The modal data of the powertrain mounting system at the modal frequencies can include the modal frequency, modal direction, and mode shape. The modal data of the powertrain mounting system can include modal data for each specified direction. In one example, the modal data of the powertrain mounting system includes the X mode, Y mode, Z mode, RX mode, RY mode, and RZ mode.

[0063] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0064] In one embodiment, a powertrain mounting system rigid body modal data testing device is provided, which corresponds one-to-one with the powertrain modal data testing method described in the above embodiments. For example... Figure 4As shown, the powertrain suspension system rigid body modal data testing device includes a frequency response data acquisition module 10, a peak frequency selection module 20, a modal frequency determination module 30, and a modal data generation module 40. Detailed descriptions of each functional module are as follows:

[0065] The frequency response data acquisition module 10 is used to acquire frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0066] Peak frequency selection module 20 is used to select a number of candidate peak frequencies from the frequency response test data, wherein the first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve;

[0067] The modal frequency determination module 30 is used to obtain the phase information of the candidate peak frequencies and determine the candidate peak frequencies whose phase information is within a preset phase position range as modal frequencies.

[0068] The modal data generation module 40 is used to acquire phase comparison information of each acquisition point at the modal frequency, determine the modal direction of the modal frequency based on the phase comparison information, and generate modal data of the powertrain mounting system at the modal frequency.

[0069] Optionally, the active side includes a powertrain and a suspension active side; wherein the number of collection points set on the active side is not less than 4, and the number of collection points set on the suspension active side is at least 1.

[0070] Optionally, the suspension modal data testing device also includes:

[0071] The multimodal data module is used to generate a specified number of modal data based on frequency response test data from multiple specified directions.

[0072] Optionally, the suspension modal data testing device also includes:

[0073] The excitation module is used to apply excitation in the specified direction to the powertrain and acquire the collected data through sensors set at the acquisition point.

[0074] Optionally, the preset phase position range includes and This is the allowable phase deviation.

[0075] Optionally, the modal data generation module 40 includes:

[0076] The first mode determination unit is configured to determine the mode direction of the mode frequency if the phase of each acquisition point is the same at the mode frequency, and the mode direction of the mode frequency is the same as the specified direction.

[0077] The second mode determination unit is configured to determine the mode direction of the modal frequency as the rotation direction of the second direction if at least two acquisition points set along the first direction have a phase difference at the modal frequency and at least two acquisition points set along the second direction have the same phase at the modal frequency.

[0078] The third mode determination unit is configured to determine the mode direction of the modal frequency as the rotation direction of the first direction if at least two acquisition points set along the first direction have the same phase at the modal frequency, and at least two acquisition points set along the second direction have a different phase at the modal frequency.

[0079] Optionally, the modal data generation module 40 includes:

[0080] The modal shape calculation unit is used to calculate the dynamic image of each modal frequency and generate the modal shape of the modal frequency;

[0081] A modal data generation unit is used to generate the modal data based on the modal frequency, the modal direction, and the modal shape.

[0082] Specific limitations regarding the powertrain mounting system rigid modal data testing device can be found in the above-mentioned limitations on the powertrain mounting system rigid modal data testing method, and will not be repeated here. Each module in the aforementioned powertrain mounting system rigid modal data testing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0083] This invention also provides a vehicle optimization method that uses modal data generated by any of the above-mentioned powertrain mounting system rigid body modal data testing methods.

[0084] This invention also provides a vehicle optimized by the aforementioned vehicle optimization method.

[0085] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 5As shown, the computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computational and control capabilities. The memory includes a readable storage medium and internal memory. The readable storage medium stores an operating system, computer-readable instructions, and a database. The internal memory provides an environment for the operation of the operating system and computer-readable instructions in the readable storage medium. The database stores data related to the powertrain mounting system rigid body modal data testing method. The network interface communicates with external terminals via a network connection. When the computer-readable instructions are executed by the processor, they implement a powertrain mounting system rigid body modal data testing method. The readable storage medium provided in this embodiment includes both non-volatile and volatile readable storage media.

[0086] In one embodiment, a computer device is provided, including a memory, a processor, and computer-readable instructions stored in the memory and executable on the processor, wherein the processor performs the following steps when executing the computer-readable instructions:

[0087] Acquire frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0088] Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve.

[0089] The phase information of the candidate peak frequencies is obtained, and the candidate peak frequencies whose phase information is within a preset phase position range are determined as modal frequencies;

[0090] The phase comparison information of each acquisition point at the modal frequency is acquired, the modal direction of the modal frequency is determined based on the phase comparison information, and modal data of the powertrain mounting system at the modal frequency is generated.

[0091] In one embodiment, one or more computer-readable storage media storing computer-readable instructions are provided. The readable storage media provided in this embodiment include non-volatile readable storage media and volatile readable storage media. The readable storage media stores computer-readable instructions, which, when executed by one or more processors, perform the following steps:

[0092] Acquire frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side.

[0093] Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve.

[0094] The phase information of the candidate peak frequencies is obtained, and the candidate peak frequencies whose phase information is within a preset phase position range are determined as modal frequencies;

[0095] The phase comparison information of each acquisition point at the modal frequency is acquired, the modal direction of the modal frequency is determined based on the phase comparison information, and modal data of the powertrain mounting system at the modal frequency is generated.

[0096] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware with computer-readable instructions. These computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When executed, these computer-readable instructions can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0097] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0098] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for testing rigid body modal data of a powertrain suspension system, characterized in that, include: Acquire frequency response test data in a specified direction. The frequency response test data includes data collected from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side. Several candidate peak frequencies are selected from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve. The phase information of the candidate peak frequencies is obtained, and the candidate peak frequencies whose phase information is within a preset phase position range are determined as modal frequencies; The phase comparison information of each acquisition point at the modal frequency is acquired, the modal direction of the modal frequency is determined based on the phase comparison information, and modal data of the powertrain mounting system at the modal frequency is generated.

2. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, The active side includes the powertrain and the active suspension side; wherein, the number of collection points set on the active side is not less than 4, and the number of collection points set on the active suspension side is at least 1.

3. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, After acquiring phase comparison information of each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating modal data of the powertrain mounting system at the modal frequency, the method further includes: Generate a specified number of mode shape data based on frequency response test data from multiple specified directions.

4. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, The step of acquiring frequency response test data in a specified direction, wherein the frequency response test data includes data collected from multiple acquisition points, and the acquisition locations of the multiple acquisition points include the active side and the suspended passive side, further includes: An excitation in the specified direction is applied to the powertrain, and the collected data is acquired by a sensor located at the acquisition point.

5. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, The preset phase position range includes [ and This is the allowable phase deviation.

6. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, The process of acquiring phase comparison information at each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating modal data of the powertrain mounting system at the modal frequency includes: If the phase of each acquisition point is the same at the modal frequency, then the modal direction of the modal frequency is the same as the specified direction; If at least two acquisition points set along the first direction have a phase difference at the modal frequency, and at least two acquisition points set along the second direction have the same phase at the modal frequency, then the modal direction of the modal frequency is the rotation direction of the second direction; If at least two acquisition points set along the first direction have the same phase at the modal frequency, and at least two acquisition points set along the second direction have a different phase at the modal frequency, then the modal direction of the modal frequency is the rotation direction of the first direction.

7. The method for testing rigid body modal data of a powertrain mounting system as described in claim 1, characterized in that, The process of acquiring phase comparison information at each acquisition point at the modal frequency, determining the modal direction of the modal frequency based on the phase comparison information, and generating modal data of the powertrain mounting system at the modal frequency includes: Calculate the dynamic images of each modal frequency and generate the mode shapes of the said modal frequencies; The modal data is generated based on the modal frequency, the modal direction, and the modal shape.

8. A device for testing rigid body modal data of a powertrain suspension system, characterized in that, include: The frequency response data acquisition module is used to acquire frequency response test data in a specified direction. The frequency response test data includes data acquired from multiple acquisition points, and the acquisition positions of the multiple acquisition points include the active side and the suspended passive side. The peak frequency selection module is used to select several candidate peak frequencies from the frequency response test data. The first amplitude of the candidate peak frequency on the active side frequency response curve is greater than twice the second amplitude of the candidate peak frequency on the passive side frequency response curve. The modal frequency determination module is used to obtain the phase information of the candidate peak frequencies and determine the candidate peak frequencies whose phase information is within a preset phase position range as modal frequencies. A modal data generation module is used to acquire phase comparison information of each acquisition point at the modal frequency, determine the modal direction of the modal frequency based on the phase comparison information, and generate modal data of the powertrain mounting system at the modal frequency.

9. A method for optimizing a vehicle, characterized in that, Modal data generated using the powertrain mounting system rigid body modal data testing method according to any one of claims 1 to 7.

10. A car, characterized in that, The vehicle is optimized using the vehicle optimization method described in claim 9.

Images