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Design method for rear drive axle of micro-surface automobile with low noise

A technology of rear drive axle and design method, which is applied in vehicle suspension/shock absorbing mechanism testing, measurement of ultrasonic/sonic wave/infrasonic wave, measuring device, etc. It can solve the problems of large vibration and noise of rear drive axle and affect automobile NVH, and achieve vibration Effects of speed reduction and noise reduction

Inactive Publication Date: 2011-10-19
BEIJING INSTITUTE OF TECHNOLOGYGY +2
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Problems solved by technology

[0003] In view of this, the present invention provides a method for designing a rear drive axle of an automobile, which can reduce the noise of the rear drive axle of a micro-face automobile by using the structural dynamics modification technology, and solve the problem that the vibration noise of the rear drive axle of a micro-face automobile is too large and affects the NVH of the automobile. question

Method used

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  • Design method for rear drive axle of micro-surface automobile with low noise
  • Design method for rear drive axle of micro-surface automobile with low noise
  • Design method for rear drive axle of micro-surface automobile with low noise

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Embodiment Construction

[0017] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0018] The invention provides a method for designing a rear drive axle of a low-noise micro-surface automobile, comprising the steps of:

[0019] Step 1. Set 80 vibration measuring points on the rear axle housing. These 80 vibration measuring points are evenly arranged on the rear axle housing. The specific vibration measuring points are as follows: figure 1 As shown; each vibration measuring point is equipped with a vibration sensor. Before carrying out the experiment, each sensor should be calibrated. For example, set the filtering frequency to 2000Hz, the sampling frequency to 5000Hz, the number of data sampling blocks to 4, and the program-controlled magnification factor to 4.

[0020] Step 2. Set the hammer excitation point directly above the main reduction part of the rear axle, that is, near the 40th vibration measurement point, apply percussion a...

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Abstract

The invention discloses a design method for the rear drive axle of a micro-surface automobile with low noise, wherein 80 vibration measuring points are uniformly arranged on the shell of the rear axle; each vibration measuring point is provided with a vibration sensor which is forcefully beaten at the right upper part of the main reduction part of the rear axle to apply excitation; the vibration data of each vibration measuring point are obtained by utilizing the vibration sensors; the transfer functions between the vibration response and knocking force signals of each vibration measuring point are solved, thereby obtaining the total transfer functions of the rear drive axle; the modal fitting and the mass unification are carried out by utilizing the total transfer functions and combiningthe structural model of the rear drive axle, thereby identifying the modal parameters of the rear drive axle; the sensitivity data of the natural frequency of each vibration measuring point on rigidness corresponding to the selected order are drawn by utilizing a test modal analysis technique; and a welding metal block with the multiple vibration measuring points is selected according to the sensitivity curve, thereby finishing the noise reduction optimization of the rear drive axle. The design method disclosed by the invention can solve the problem that the vibration noise of the rear drive axle of the micro-surface automobile is overlarge to influence the NVH (noise, vibration and harshness) of the automobile.

Description

technical field [0001] The invention relates to the technical field of micro-surface automobile chassis drive axle design, in particular to a design method for a low-noise micro-surface automobile rear drive axle. Background technique [0002] The rear drive axles of micro-faced cars sold on the existing market generally have large vibrations and high noises, which affect the ride comfort in the car. Structural dynamic design concept. At present, there is not a kind of automobile rear drive axle design method that can reduce noise in the open documents. It is an urgent problem to be solved to provide a design method for the rear drive axle of an automobile which reduces noise. Contents of the invention [0003] In view of this, the present invention provides a method for designing a rear drive axle of an automobile, which can reduce the noise of the rear drive axle of a micro-face automobile by using the structural dynamics modification technology, and solve the problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01M17/04
Inventor 李惠彬余波宋金响孙振莲周江伟蒋碌权
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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