Research on the Vibration and Noise Reduction of Thin-Walled Planetary Gearbox

An effective method of vibration and noise reduction is proposed. Firstly, the vibration acceleration and radiated noise of the thin-walled planetary gearbox was calculated using finite element method/boundary element method. Setting the machine foot with largest vibration acceleration and the field point with the largest sound pressure level of radiated noise as the design target, the design region was determined through the comprehensive screening of vibration response, acoustic transfer vector and modal acoustic contribution. The concepts of vibration isolation structure and vibration damping structure were proposed. Arranging vibration isolation structure and vibration damping structure on the design region, the influence of the parameters of vibration isolation structure on vibration and noise reduction is studied. Finally, the vibration and noise reduction design scheme is identified. The design results show that the design region can be found quickly and exactly using this method. The peak value of the vibration of the machine feet and that of the radiated noise in the sound field are reduced, and the distribution of the vibration in machine feet and that of radiated noise in sound field are more uniform at the same time, which proves the effectiveness of the design method.