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Method for lowering low-frequency noise of rear torsion beam automobile model braking

A low-frequency noise and torsion beam technology, applied in the field of automobile braking, can solve the problems of uneasiness of pedestrians and surrounding residents, affecting NVH performance, etc., and achieve good economic benefits, low cost, and increased manufacturing costs.

Inactive Publication Date: 2019-01-18
CHERY COMML VEHICLE ANHUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the full popularity of rear disc brakes, some models with rear suspension types of torsion beams emit a low-frequency braking noise similar to cows under certain environmental conditions, that is, Moan noise, and the sound intensity ranges from 10DB to 100DB Seriously affect NVH performance, causing unnecessary anxiety to road pedestrians and surrounding residents

Method used

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  • Method for lowering low-frequency noise of rear torsion beam automobile model braking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Example 1: 1) A low-frequency noise evaluation test is carried out for a certain type of passenger car, and the temperature of the environment where the passenger car is located is controlled at -5°C to 0°C, the humidity is 95%rh to 100%rh, and the initial velocity is 0 to 100%. 5km / h, deceleration 0 ~ 0.1g, and test with the forward and backward combination of the whole vehicle respectively. The noise frequency under this working condition is obtained by the noise detector as 100Hz ~ 300HZ, which is within the frequency range of low frequency Moan noise, and Determine the above-mentioned operating conditions that produce the low-frequency Moan noise;

[0035] 2) Install the rear suspension system on the brake inertia bench test machine. The rear suspension system includes the rear disc brake 1, the torsion beam 3 and the hydraulic system that controls the movement of the rear disc brake 1. According to the working conditions that generate the above-mentioned low-frequenc...

Embodiment 2

[0038] Example 2: 1) The low-frequency noise evaluation test is carried out for the same passenger car, and the temperature of the environment where the passenger car is located is changed to 0°C-5°C, the humidity is 90%rh-95%rh, and the initial speed is 0-5km / h h. The deceleration is 0~0.1g, and it is tested with the combination of forward and backward of the whole vehicle respectively. The noise frequency under this working condition is obtained by the noise detector as 300Hz~800HZ, which is within the frequency range of low frequency noise, and it is confirmed that the noise is generated. The above working conditions of low frequency noise;

[0039] 2) Install the rear suspension system on the brake inertia bench test machine. According to the working conditions that generate the above-mentioned low-frequency noise, drive the brake disc to rotate on the inertia bench through the motor on it, and simulate the initial velocity and deceleration in the above range. Speed, simul...

Embodiment 3

[0042] Example 3: 1) The low-frequency noise evaluation test is carried out for the same passenger car, and the temperature of the environment where the passenger car is located is changed to 5°C-10°C, the humidity is 80%rh-90%rh, and the initial speed is 0-5km / h h. The deceleration is 0 ~ 0.1g, and the combination of forward and backward of the whole vehicle is tested respectively. The noise frequency under this working condition is obtained by the noise detector as 800Hz ~ 1000HZ, which is within the frequency range of low frequency noise. The above working conditions of low frequency noise;

[0043] 2) Install the rear suspension system on the brake inertia bench test machine. According to the working conditions that generate the above-mentioned low-frequency noise, drive the brake disc to rotate on the inertia bench through the motor on it, and simulate the initial velocity and deceleration in the above range. Speed, simulate and reproduce the low-frequency noise, and then...

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Abstract

The invention discloses a method for lowering the low-frequency noise of rear torsion beam automobile model braking, and belongs to the technical field of automobile braking. The method comprises thefollowing steps that: carrying out a noise detection experiment on a finished automobile when a rear-disk type brake works under different working conditions, and determining a working condition whichgenerates low-frequency noise; according to the working condition, simulating and reproducing low-frequency noise, meanwhile, carrying out a vibration frequency test, and determining a low-frequencynoise transferring path; carrying out modality analysis on parts, comparing with an experiment result, and identifying parts subjected to modality coupling with the low-frequency noise; and changing the modality of the modality coupling parts, and cutting off the noise transferring path. The method has the beneficial effects that a low-frequency noise generation mechanism is combined to determinethe noise transferring path, and the modality of the parts subjected to modality coupling with the low-frequency noise is changed to cut off the noise transferring path to inhibit the low-frequency noise. The method is simple and effective, is low in cost, is high in universality and has good economic benefit, and low-frequency noise under different working conditions can be further lowered and eliminated.

Description

technical field [0001] The invention relates to the technical field of automobile braking, in particular to a method for reducing low-frequency braking noise of rear torsion beam vehicles. Background technique [0002] The brake noise generated when the car brakes is currently part of the environmental noise. With the enhancement of people's awareness of environmental protection, the problem of automobile brake noise has been paid more and more attention by people, especially in densely populated downtown areas, the brake squeal pollutes people's hearing and causes great pollution to the environment. Reducing brake noise is an important task for improving vehicle comfort and urban environments. [0003] The frequency range of brake noise ranges from tens of hertz to tens of thousands of hertz. Generally, according to the frequency band of vibration frequency, it can be divided into low-frequency vibration noise below 1000Hz and medium-high frequency vibration noise above 10...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G10K11/16
CPCG01M17/007G10K11/16
Inventor 孟令云鲍思语代立宏黄峻朱亚伟李虎本
Owner CHERY COMML VEHICLE ANHUI
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