Low-speed instability analysis for hydraulic motor based on nonlinear dynamics

摘要

A nonlinear dynamics model and a mathematical expression were set up to investigate the mechanism and conditions of vibration creep acceleration. The model shows that hydraulic spring and nonlinear friction are major factors that can affect low-speed instability. The mathematic model was established to obtain the change rule of speed and instantaneous acceleration of the hydraulic motor. Then, Matlab was used to simulate the effect of nonlinear friction force and hydraulic motor parameters such as coefficient of leak and compression ratio, etc., under low speed. Finally, some measures were proposed to improve the low-speed stability of the hydraulic motor.