关键词: 电动微卡；高速抖动；簧下偏频；车架模态

Abstract: To solve the problem of high speed vibration of the electric truck, the mechanism and transmission path of the high-speed vibration are introduced. At the same time, investigations from the excitation source to the transmission path and response point are proposed. The results from analysis is that the cause of the vibration problem is the vibration of the front spring system caused by the excitation of the tire, which resonated with the frame, than cause forced vibration in the cab. The solutions are proposed that to reduce the vibration of the excitation source, the dynamic balance, end jump, and radial jump of the tire are needed to improve, to avoid the resonation, the stiffness of the tire is needed to increase. From the test results, the effect is obvious, which has significance for the solution of engineering problems.

Key words: Electric truck; High speed vibration; Spring frequency; Frame model