Abstract：A translational-rotational coupling dynamic model of 3-stage planetary gears train was established, including complicated factors, such as, time-varying mesh stiffness, time-varying phase angles of planetary position, mesh synthetic errors and damping. Based on the eigenvalue problem, the natural frequencies were calculated. The vibration modes were classified into three types: rotational coupling modes, translational coupling modes and planet modes and the unique properties of each type were examined. The natural frequency sensitivities to system parameters were investigated. The results show that, for some sensitive regions of the parameters, the micro-changes of system parameters can cause great variation of the natural frequency sensitivities and the modal strain energy, the energy transfer between stages, as result, the vibration characteristic worsen.
2013, Vol. 32 
