Research on the Reduction of Gearbox Noise based on Modal Acoustic Contributions

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (17) : 50-57.

WANG Jin-peng1, CHANG Shan1,2, LIU Geng1, WU Li-yan1, CHANG Le-hao1

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Abstract

The radiated noise of gearbox with a double helical gear system is calculated using FEM/BEM and the influence of mode shapes on radiated noise is analyzed. The modal participation factors and modal acoustic contributions of each mode are calculated and the mode having maximum contribution to the radiated noise on the input and output field points is found. The reasonable arrangements of ribs and isolate masses are proposed according to the analysis of modal acoustic contributions. The results show that the flexural vibration of gearbox housing has most obvious effect on the radiated noise. When the mode having maximum acoustic contributions is found, the positions on each panel having obvious flexural vibrations can be obtained and the radiated noise on the field points at the same side with the panel can be reduced by adding ribs or isolation massed on these positions.

Key words

gearbox / mode shape / modal participation factors / modal acoustic contributions / noise

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WANG Jin-peng1, CHANG Shan1,2, LIU Geng1, WU Li-yan1, CHANG Le-hao1. Research on the Reduction of Gearbox Noise based on Modal Acoustic Contributions[J]. Journal of Vibration and Shock, 2015, 34(17): 50-57

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