含裂纹的人字齿轮行星系统均载分析OA

To investigate the influence of root cracks on the load-sharing characteristics of herringbone planetary gear system,a 23-degree-of-freedom bending-torsional-axial coupled dynamic model was established,considering the effects of crack length,mesh stiffness,and damping.The time-varying mesh stiffness(TVMS)of the cracked system was derived using the potential energy method,and the system's nonlinear dynamic equations were solved by the Runge-Kutta method to obtain the dynamic meshing force and load-sharing coefficient.The results indicate that the presence of gear cracks reduces the system's TVMS and induces obvious excitations in the load-sharing curve.As the crack propagates,the load-sharing coefficient first decreases and then increases,showing a gradual deterioration of the load-sharing performance.Under constant manufacturing errors,the load-sharing coefficient of both internal and external meshing pairs increases with crack severity,indicating degraded load-sharing capability.Conversely,when the crack size remains unchanged,increasing manufacturing errors also cause the load-sharing coefficient to rise,further confirming that the load-sharing performance deteriorates with larger errors.