Analysis and Improvement on Abnormal Vibration for Power Assembly of Vehicle

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (10) : 64-67.

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Analysis and Improvement on Abnormal Vibration for Power Assembly of Vehicle

Meng Hao-dong1, Li Shun-ming1, L Guo-hua2, Xu Yi2

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Abstract

In the light of an abnormal vibration problem occurred in the Sports Utility Vehicle’s power assembly of diesel engine which resulted in acute vibration of control handle, a study of the dynamic characteristics of power assembly’s vibration which took vibration test and finite element simulation analysis together was carried out. The power assembly system resonance was caused under the excitation of the 2nd order excitation frequency of the diesel engine’s working rotation by vehicle road test and chassis dynamometer test, a kind of finite element model of vibration analysis for the power assembly of diesel engine was set up by means of adopting finite element method, its natural frequencies and modal shapes of the power assembly’s vibration were calculated. It was found that the low stiffness of flywheel shell resulted in the low bending stiffness of the power assembly. On the basis of validating the rational finite element results of simulation model, the inherent frequency of power assembly was improved by the way of improving on the flywheel shell’s structure which was away from resonance frequency range, the abnormal vibration of control handle was finally removed. The test and simulation analysis methods mentioned in this paper which solve the similar engineering problem are advisable to the reference guidance and engineering application.

Key words

Power assembly / Abnormal vibration / Control handle / Simulation analysis / Dynamic characteristics

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Meng Hao-dong; Li Shun-ming; L Guo-hua; Xu Yi. Analysis and Improvement on Abnormal Vibration for Power Assembly of Vehicle[J]. Journal of Vibration and Shock, 2012, 31(10): 64-67