抄録
This paper deals with nonlinear vibration caused by parametric excitation in gears, namely, the gear rattle of helical gear system and the parametric excitation of multi-step gear system. These systems are studied by approximate method and the numerical analysis which is called shooting method. As a result, the followings were made clear. (1) In the gear rattle, because of the interaction of the torque variation, the tooth profile error, and the mesh stiffness variation, large amplitude vibrations occur in low frequency region and the higher-harmonic resonances also generate. (2) In multi-step gear system, not only primary and secondary parametric excitation but also many types of parametric excitations such as combination parametric excitation generate, because of the characteristic of multi-degree-of-freedom system with the mesh stiffness variations.
