CN-122016346-A - Wheel center force test method

CN122016346ACN 122016346 ACN122016346 ACN 122016346ACN-122016346-A

Abstract

The application provides a test method for wheel center force of a wheel, and belongs to the technical field of vehicle test. The method comprises the steps of arranging a plurality of excitation points around a wheel center virtual point on a wheel, sequentially exciting the wheel by using an excitation device, synchronously collecting excitation force, steering knuckle vibration response and in-vehicle noise response signals to obtain a vibration transfer function matrix and a noise transfer function matrix, constructing a conversion matrix according to the spatial coordinate relation between the wheel center virtual point and the excitation point, and converting the actually measured transfer function matrix into a transfer function matrix from the wheel center virtual point to each response point. And collecting vibration response data and noise response data of the vehicle under a preset working condition. And obtaining the wheel center force acting on the wheel center virtual point based on the converted transfer function matrix and response data of the preset working condition. According to the application, through the combination of multi-point excitation, virtual point conversion and indoor controlled working condition test, the test precision of a transfer function is effectively improved, the environmental interference of outdoor real-way test is eliminated, and the data precision of the wheel center is remarkably improved.

Inventors

ZHANG GUIHAO
JI HAO
QIN JUNXU
QIN TAO
WANG YULEI
ZHAO LONGJUN
WEI JIANG
LUO JISHAN

Assignees

上汽通用五菱汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (10)

1. A method of testing the wheel heart rate of a wheel, the method comprising: A plurality of actual excitation points are arranged around a wheel center virtual point in a brake disc or wheel hub mounting area of the wheel; Exciting each actual excitation point sequentially by using an excitation device, and collecting excitation force signals, vibration response signals of each response point on a vehicle suspension knuckle and noise response signals of noise measuring points in a vehicle cabin; Based on the excitation force signal and the noise response signal, a noise transfer function matrix from each actual excitation point to a noise measuring point in a vehicle cabin is obtained; Constructing a conversion matrix according to the space coordinate relation between the wheel center virtual point and each actual excitation point, and converting the vibration transfer function matrix and the noise transfer function matrix into a vibration transfer function matrix from the wheel center virtual point to the response point and a noise transfer function matrix from the wheel center virtual point to a noise measurement point in a vehicle room by utilizing the conversion matrix; Carrying out a preset working condition test on the vehicle on a test bed, and collecting vibration response data of the response points and noise response data of noise measuring points in the vehicle room under the preset working condition; And obtaining the wheel center force acting on the wheel center virtual point through an inverse matrix method according to the vibration transfer function matrix from the wheel center virtual point to the response point and the vibration response data under the preset working condition.
2. A method of testing the wheel hub force of a vehicle wheel according to claim 1, wherein a plurality of actual excitation points are arranged around a virtual point of the hub in a brake disc or hub mounting area of the vehicle wheel, comprising: a plurality of excitation tools are designed and mounted on the wheel mounting screw of the brake disc, and each excitation tool is defined with excitation positions in a plurality of directions, and the plurality of directions correspond to three orthogonal axial directions of the vehicle.
3. The method for testing the wheel hub force according to claim 2, wherein the number of the excitation tools is five, three excitation positions are defined on each excitation tool, and fifteen actual excitation points are formed.
4. The method for testing the wheel hub force according to claim 1, wherein the excitation device is a miniature vibration exciter.
5. The method according to claim 1, wherein the transformation matrix is constructed based on a coordinate transformation and a modal coordinate transformation method, and is used for establishing a mathematical mapping relationship between the excitation force at the wheel center virtual point and the excitation force at each of the actual excitation points.
6. The method for testing the wheel hub force according to claim 1, wherein the step of testing the vehicle under the preset working condition on the test stand, collecting vibration response data of the response point under the preset working condition and noise response data of the noise measuring point in the vehicle room, includes: Placing the vehicle on a whole vehicle drum test bed, and simulating the excitation of the road surface to the vehicle by using the rough road surface of the drum; and controlling the vehicle to perform uniform acceleration and uniform deceleration circulation running, and collecting vibration response data of the response points and noise response data of noise measuring points in the vehicle room in the circulation process.
7. The method according to claim 6, wherein the cycle of uniform acceleration and uniform deceleration is performed by uniformly accelerating and uniformly decelerating the vehicle within a preset range above and below a reference vehicle speed value and cycling a plurality of times.
8. The method for testing the wheel hub force according to claim 7, wherein the reference vehicle speed value is 60km/h, the range is 5% above and below the reference vehicle speed value, and the number of cycles is 2 to 3.
9. The method of testing the wheel hub force according to claim 1, further comprising: synthesizing theoretical response data of noise in the vehicle room by using the calculated wheel center force and a noise transfer function matrix from the wheel center virtual point to the noise measuring point in the vehicle room; And comparing the theoretical response data with the actually measured noise response data, and evaluating the accuracy of the wheel center force according to the consistency of the theoretical response data and the actually measured noise response data.
10. The method according to claim 1, wherein the number of the response points arranged on the suspension knuckle is five or more, and the positions of the response points are not coplanar with each other.

Description

Wheel center force test method Technical Field The application belongs to the technical field of vehicle testing, and particularly relates to a method for testing the wheel center force of a wheel. Background The wheel center force is a key input excitation load in the road noise simulation of the whole vehicle, is also an important parameter basis for tire selection in road noise development, and has great influence on the development of the road noise performance of the whole vehicle due to the test precision. The existing method for acquiring the wheel center force generally adopts a traditional wheel center force transmission path analysis (TRANSFER PATH ANALYSIS, TPA) test, and indirectly acquires the wheel center force through an inverse matrix method. The test is mainly divided into two stages, namely a transfer function test stage and a working condition test stage. The transfer function test stage is to arrange acceleration vibration sensors at positions which are not on the same plane of the suspension knuckle, arrange microphones at positions beside ears of a driver and a passenger in the vehicle, arrange clamps at the positions of rims and strike the clamps with a hammer, and acquire and obtain a vibration transfer frequency response function from an excitation point to the suspension knuckle and a noise transfer function from the excitation point to the positions of the microphones in the vehicle; the working condition test stage is to start the vehicle to a rough road surface of a test field for working condition test, and collect the vibration response of an acceleration vibration sensor on a steering knuckle and the noise response of a microphone in the vehicle under the corresponding working conditions. In the process, the excitation force and the direction of the knocking force of the hammer are difficult to be consistent, extra human errors and random errors are introduced, and the accuracy of response data is affected due to the fact that external interference factors are more when working condition tests are carried out on an actual road surface. The calculation and verification process of the wheel center force comprises the steps of reversely solving the wheel center force of four wheels through a transfer function from an excitation point to a vibration sensor on a suspension knuckle and acceleration vibration response data on the knuckle according to an inverse matrix method, multiplying the wheel center force of the four wheels and noise transfer function data from the wheel center to the position of a microphone in a vehicle according to a linear time-invariant system assumption and a superposition principle, linearly superposing and fitting the noise response of the position of the microphone in the vehicle in a frequency domain, and judging the acquisition accuracy of the wheel center force by comparing the consistency degree of the fitted noise response in the vehicle with the noise response in a vehicle tested under actual working conditions according to a linear time-invariant system assumption. The method for acquiring the transfer function by carrying out single-point force hammer knocking on the rim is difficult to accurately and comprehensively characterize the vibration transfer characteristic from the wheel center to the complex suspension system, so that the test precision of the transfer function is limited, the acquired wheel center force precision is lower, and the requirement of high-precision development is difficult to meet. A comparison curve of the noise response in the vehicle, which is tested and fitted in the prior art, and the noise response in the vehicle, which is tested in the actual working condition, is shown in fig. 1, wherein a red curve in fig. 1 is an actual measurement response value, and a blue curve is a fitting value. The fact that the consistency difference of the two curves in the low-frequency band is large can be seen from fig. 1, which indirectly shows that the accuracy of the wheel center force obtained by the prior test technology is not high. In summary, how to solve the problem of low wheel center force testing precision caused by single excitation mode, incomplete transfer function characterization and large interference of working condition testing environment in the traditional testing method, so as to obtain high-precision wheel center force data of the wheel has become a technical problem to be solved in the field. Disclosure of Invention The application aims to solve the problems in the prior art, and provides a wheel center test method, which effectively solves the problem of low wheel center test precision caused by single excitation mode, incomplete transfer function characterization, large interference of working condition test environment and the like in the traditional test method, thereby obtaining high-precision wheel center data. The application is realized by the following technical scheme: The application provides a te