Study on Vibration and Noise Characteristics of Pure Electric Bus

In this paper, an experimental study is carried out on the vibration and noise of a pure electric bus under acceleration and uniform speed conditions. The vibration and noise data in the vehicle are collected by LMS sound and vibration signal acquisition system, and the vibration and noise excitation sources are analyzed by means of frequency spectrum analysis and order tracking, and the vibration and noise characteristics of electric vehicles are summarized. The experimental results show that the vibration in the vehicle at constant speed is mainly the road excitation from the suspension, and the excitation of the motor is more obvious when driving at an accelerated speed, especially the high frequency excitation near the switching frequency of the motor. The study in this paper can provide a basis for the improvement of vibration and noise of electric vehicles in the next step.