基于虚拟样机技术的故障行星齿轮系统接触力仿真

Simulation of Contact Force of Fault Planetary Gear System based on Virtual Prototype Technology

为了获得故障行星齿轮系统的接触力变化规律,建立故障行星齿轮系统的动力学模型,结合基于Hertz接触理论的齿轮啮合传动的计算方法,对含有断齿故障的行星齿轮系统进行动力学仿真。结果表明,与正常行星齿轮系统的接触力相比,断齿故障的行星齿轮系统的接触力在时域中含有明显的周期性冲击;在频域中,不仅出现了故障频率,而且在啮合频率及其倍频处还出现了以故障频率为边频带的故障特征。通过对故障行星齿轮系统动力学研究,可以为行星齿轮系统故障诊断提供参考和依据。

In order to obtain the changing pattern of contact force of fault planetary gear system, a dynamics model of fault planetary gear system is established and the computation method for contact force of gear meshing based on Hertz theory is also introduced, with the dynamics model, the fault planetary gear system is simulated. The results show that compared with the normal contact force of planetary gear system, the contact force of snaggletooth of planetary gear system contains obvious cy- clical impact in time domain. In the frequency domain, not only the failure frequency is found, but also fault characteristic that failure frequency stands for side band in meshing frequency and the frequency doubling is appeared. Through the research of dynamics of fault planetary gear system, the reference and basis are provided for planetary gear system fault diagnosis.