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The bearing transmits the transmission system's vibration to the box when the reducer is in operation, not only impacting the stability of the system but also creating noise pollution. Therefore, the accurate prediction of the vibration and noise of the reducer is particularly important. A presentation of a novel main reducer with double planetary gear is made, and the essential parameters influencing the reducer's vibration and radiated noise are systematically scrutinized and appraised. The stress analysis of the two-stage planetary gear system was conducted in the vibration analysis process, followed by the mesh stiffness and supporting stiffness of the shaft, the classification of the coupling system's modal and vibration mode, and the analysis of the dynamic load factor and uniform loading situation, statics, dynamics performance of the gear train of the simulation test in various working conditions. The finite element and concentrated parameter methods were utilized to determine the meshing stiffness of the gear, the supporting stiffness of the bearing, and the planetary pin in a two-stage planetary gear system. The results demonstrate that the maximum stress of each component of the gear reducer is below the yield limit of 20CrMnTi, leaving sufficient allowance. By employing the 45-order Runge-Kutta technique, the dynamic equation was solved, yielding the dynamic load factor under rated torque and peak condition. Utilizing Matlab eig function, the simplified undamped free vibration equation was then solved, yielding the mode natural frequency and mode shape. It is found that the vibration amplitude of the first planetary gear train is large under low frequency. This paper can be used to further refine the design of electric vehicle vibration noise
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