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

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 ...

AI Technical Summary

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

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