• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2021, Vol. 57 ›› Issue (19): 113-127.doi: 10.3901/JME.2021.19.011

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Research on the Nonlinear Dynamics of Micro-segment Gear System with Time-Varying Friction Coefficient

XIONG Yangshou1, HAN Guangzhi2, HUANG Kang2, ZHAO Han2   

  1. 1. Anhui Province Key Lab of Aerospace Structural Parts Forming Technology and Equipment, Hefei 230009;
    2. School of Mechanical Engineering, Hefei University of Technology, Hefei 230009
  • Received:2020-12-31 Revised:2021-03-08 Online:2021-10-05 Published:2021-12-13

Abstract: A systematic dynamic analysis of a micro-segment gear system with time-varying friction coefficient, time-varying base circle, and time-varying stiffness is made. A six-degree-of freedom nonlinear dynamic model of a micro-segment gear is established by discretizing the meshing process. The numerical integration method is used to study the dynamic response of the micro-segment gear and involute gear under different operating conditions. The effects of different parameters on radial vibration are investigated from the amplitude–frequency response and bifurcation diagram. Through the experiment, the micro-segment gear and the involute gear are compared during the actual operation. The results reveal that compared with involute gear, micro-segment gear has smaller vibration and better system stability, especially in the case of medium-high speed and heavy load. The common amplitude value can be effectively reduced by increasing the support stiffness and the support damping, but the change in the support stiffness changes the position of the resonance region. The friction coefficient has little effect on the amplitude of the micro-segment gear, but increasing the friction coefficient causes the system to end the chaotic response ahead of time. The error and vibration of the micro-segment gearbox during actual operation are smaller and the performance is better.

Key words: nonlinear dynamics, microsegment gear, time-varying friction coefficient, time-varying base circle, vibration

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