CN-116067674-B - Method for simulating braking noise of rack

CN116067674BCN 116067674 BCN116067674 BCN 116067674BCN-116067674-B

Abstract

The invention discloses a method for simulating a rack brake noise, which comprises the steps of collecting objective data of brake noise of a whole car as a brake working condition and a brake noise working condition, taking the percentage of the brake noise working condition and the brake working condition as a reference value of the rack simulation, extracting the working condition of the brake noise generated by the rack in the test process to obtain an actual brake noise working condition, extracting the actual brake working condition consistent with the actual brake noise working condition in the whole test process to obtain an actual brake noise ratio, and comparing and evaluating the actual brake noise ratio of the whole car obtained by the test with the reference value of the rack simulation to realize the rack brake noise simulation.

Inventors

ZHANG YONG
HUANG PING
XUE ZHIXIANG
LIU QUAN

Assignees

奇瑞汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230129

Claims (10)

1. A method for simulating the braking noise of a rack is characterized by comprising the following steps of, S1, collecting objective data of the whole vehicle braking noise as a braking working condition, wherein the objective data capable of giving out noise is used as a braking noise working condition; S2, taking the percentage of the braking noise working condition and the braking working condition as a reference value of the bench simulation; S3, in the test process, extracting the working condition of the whole vehicle with brake noise to obtain an actual brake noise working condition, and extracting the actual brake working condition consistent with the actual brake noise working condition in the whole test process to obtain an actual brake noise ratio; s4, comparing and evaluating the actual brake noise ratio of the whole vehicle obtained through the test with a reference value of the bench simulation, and realizing the bench brake noise simulation.
2. A method of modeling braking noise in a skid as defined in claim 1, wherein said braking conditions include friction plate temperature, braking deceleration, initial braking speed, final braking speed, brake pipe pressure, ambient temperature and ambient humidity.
3. A method of modeling braking noise for a truck as claimed in claim 1 wherein the truck is operated in accordance with braking conditions and the resulting actual braking noise ratio is close to a reference value for the truck modeling to account for the effectiveness of the truck braking noise modeling.
4. The method for simulating braking noise of a stand according to claim 1, wherein the extracting of the working condition in which the braking noise occurs includes extracting a noise road spectrum and extracting a braking road spectrum, wherein the noise road spectrum is the number of times the stand is subjected to noise during a test, and the braking road spectrum is the number of times the stand is braked during the test.
5. A method of gantry braking noise simulation according to claim 1, characterized in that the method of gantry braking noise simulation is adapted to high frequency braking noise with a braking noise frequency of more than 3000 Hz.
6. The method for simulating the braking noise of the stand according to claim 1, wherein the noise decibel value and the noise frequency are used as the basis for judging the noise, and the noise occurs once according to the record that the decibel value is more than or equal to 50 dB.
7. The method for simulating the braking noise of the bench according to claim 1, wherein the specific process of extracting the actual braking noise working condition is that in the test process, according to the braking working condition, the noise decibel value and the noise frequency, all parameters of the braking noise of one cycle working condition after the braking noise of the bench occurs are extracted according to the working condition of the braking noise of the bench, the parameters are taken as reference points, and the parameters of the whole cycle working condition are extracted again, so that the actual braking noise working condition is obtained.
8. The method of claim 7, wherein the cycle conditions include mountain road conditions, city conditions, suburban conditions, high speed conditions, reverse garage conditions, and forward garage conditions.
9. The method of claim 7, wherein the noise occurrence/braking count is compared with a reference value for the gantry simulation, and the verification is considered to be valid if the similarity is greater than or equal to 70%.
10. The method of claim 1, wherein the range of reference values for the bench simulation is 22% -26%.

Description

Method for simulating braking noise of rack Technical Field The invention belongs to the technical field of automobile engineering, and relates to a method for simulating braking noise of a rack. Background The functions of the sample vehicle are required to be tested in the vehicle design and braking process, so that the occurrence of dangers caused by faults of the vehicle after leaving the factory is avoided. Research shows that the braking noise is closely related to the braking working condition, such as the initial braking speed, the braking pressure, the humidity, the temperature and other factors. It is simple to use the plane contact of two blocks to simulate the braking action for the braking friction noise test device, so in the prior art, the technician often places the sample vehicle on a bench after the sample vehicle is arranged, and then tests various performances of the vehicle. However, the problem of braking noise is in the problem of after-sales hot spot in a host factory for a long time, and the existing whole car and bench test method cannot be well correlated. The result of the brake noise bench verification is often greatly different from the whole vehicle, and in the present stage, the capability of the bench is required to be used for verifying the brake road spectrum of the whole vehicle on the bench, and verification iterations are performed for a plurality of times, so that the bench verification result is as close as possible to the whole vehicle result. Disclosure of Invention Aiming at the problems in the prior art, the invention provides a method for simulating the braking noise of the stand, which can simulate the braking noise of the stand, can realize the association of the whole stand and the stand, and has a result similar to that of the whole stand. The invention is realized by the following technical scheme: a method for simulating the noise of a bench brake includes, S1, collecting objective data of the whole vehicle braking noise as a braking working condition, wherein the objective data capable of giving out noise is used as a braking noise working condition; S2, taking the percentage of the braking noise working condition and the braking working condition as a reference value of the bench simulation; S3, in the test process, extracting the working condition of the whole vehicle with brake noise to obtain an actual brake noise working condition, and extracting the actual brake working condition consistent with the actual brake noise working condition in the whole test process to obtain an actual brake noise ratio; s4, comparing and evaluating the actual brake noise ratio of the whole vehicle obtained through the test with a reference value of the bench simulation, and realizing the bench brake noise simulation. Preferably, the braking conditions include friction plate temperature, braking deceleration, initial braking speed, final braking speed, brake pipe pressure, ambient temperature and ambient humidity. Preferably, the stand operates according to the braking condition requirement, and if the obtained actual braking noise ratio is close to the reference value of the stand simulation, the method is effective for the stand braking noise simulation. Preferably, the extracting of the working condition of the brake noise comprises extracting of a noise road spectrum and extracting of a brake road spectrum, wherein the noise road spectrum is the number of times of noise occurrence of the stand in the test process, and the brake road spectrum is the number of times of brake of the stand in the test process. Preferably, the method of the bench brake noise simulation is adapted to high frequency brake noise with a brake noise frequency greater than 3000 Hz. Preferably, the noise decibel value and the noise frequency are used as the basis for judging the noise, and the noise is generated once according to the record that the decibel value is more than or equal to 50 dB. Preferably, the specific process of extracting the actual braking noise working condition is that in the test process, according to the braking working condition, the noise decibel value and the noise frequency, the parameters of the braking noise of one cycle working condition after the braking noise of the bench occurs are extracted according to the working condition of the braking noise of the bench, the parameters are taken as reference points, and the parameters of the whole cycle working condition are extracted again, so that the actual braking noise working condition is obtained. Preferably, the circulation working condition comprises mountain road working condition, city working condition, suburban road condition, high-speed working condition, reversing and moving garage working condition and advancing and moving garage working condition. Preferably, the calculated result of the noise occurrence times/braking times is compared with the reference value of the bench simulation, and if the similarity