Abstract
Automobile transmission gearbox, as one of the major components, which will inevitably bring about the vibration and noise of automobile vehicle. The objective of this study to reduce the noise and vibration of automobile transmission by structural optimization of the gearbox in order to better control its functional operation and improve its performance. For this purpose, based on the working characteristics of the gearbox, modal analysis of automobile transmission gearbox is formulated using 3D graphics software Pro/E together with Finite Element Method. In addition, the modal test of gearbox is conducted also. Through comparing model analysis results to test results, test results verify the correctness of the finite element analysis results, thus provide the theoretic basis to analyze its dynamic characteristics of the gearbox structure as well as its improvement to reduce vibration and noise.
Highlights
Automobile gearbox is a multiple degree of freedom vibration system
A variety of exciting force acting on this system is the power and source to make the gearbox produce complex vibration
The dynamic design of gearbox requires that the gearbox body has certain inherent frequency and modal shapes, which should avoid meshing frequency from internal gear of gearbox; only in this way can we ensure the gearbox assembly has good dynamic characteristics
Summary
Automobile gearbox is a multiple degree of freedom vibration system. A variety of exciting force acting on this system is the power and source to make the gearbox produce complex vibration. If the excited frequencies of these exciting forces correspond to or are similar to a certain order natural frequency of automobile gearbox, it will cause resonance, generate large-scale resonant dynamic load on certain parts of the box body and produce strong noise (Cai et al, 2011; Huang et al, 2011; Rook, 1996).
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