Optimization of tooth surface modification based on a two-stage reduction gear system

Abstract

The prominent vibration and noise problems are commonly exist in the initial design stage of gear system. To solve this problem，this paper takes the two-stage reduction gear system carried by an electric drive system as the research object. The minimum fluctuation of transmission error，minimum root mean square value of vibration acceleration in the direction of meshing line，and minimum load density of discrete points on meshing line are taken as optimization objectives. The tooth surface micro modification parameters are taken as design variable，and the algorithm NSGA- Ⅱ is used to conduct multi-objective optimization. The loaded tooth surface contact analysis（LTCA） is carried out based on the software MASTA. The results show that，compared with unmodified stage，the fluctuation of meshing transmission error and system transmission error after micro modification optimization are significantly reduced，the load distribution on the tooth surface is more uniform，the maximum contact stress and the amplitude of vibration acceleration of the bearing seat are greatly decreased，and the overall dynamic performance of gear system is improved. The research ideas and methods in this paper can provide guidance for wider optimization design of gear system.