Coupling Vibration Analysis for Planetary Gear System Considering Flexible Structure

doi:10.3901/JME.2017.01.001

Abstract

Abstract: Aimed at the problems of lower calculation accuracy of lumped mass method and large-scale computing, difficult post processing of finite element model, a novel coupling vibration analysis method for multistage planetary gear system is presented. The various components in planetary gear system are divided into three shaft models, which are simple shaft unit, planet carrier shaft unit and ring gear shaft unit, according to the structure characteristics of planetary gear system. Different types coupling dynamics model are established for planetary gear system. The results indicate that, the dynamic meshing force deviations obtained by shafting element method are almost same as that by the lumped mass method under the circumstance of lower rotation speed. But the dynamic meshing force and the resonance frequencies are both slightly lower with the increasing of speed. For a same input speed, the dynamic meshing force deviation is increasing with the thickness of ring gear, but the change tendency of the quantity is gradually decreasing. In all flexible structures, flexible shaft has a largest influence and planet carrier has a minimal impact to the vibration of the system. The gear meshing frequency in multi-stage planetary gear system are coupled with each other and become the excitation frequency of the system, and the mesh frequency of high speed stage is main excitation frequency of system. The vibration energy of the system is not only transmitted along the power flow direction but also reverse the direction of power flow transmission.

Key words: coupling vibration analysis, dynamic mesh force, planetary gear system, flexible structure

WEI Jing, ZHANG Aiqiang, QIN Datong, SHU Ruizhi. Coupling Vibration Analysis for Planetary Gear System Considering Flexible Structure[J]. Journal of Mechanical Engineering, 2017, 53(1): 1-12.

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