关键词: 卡车；启停振动；路径分析；悬置优化

Abstract: This paper analyzes the problem of cab vibration caused by the starting and stopping of trucks. When the engine starts and stops, the change of engine rotation causes the change of excitation frequency. When the excitation frequency is coupled with the rigid body mode of the powertrain, resonance vibration occurs. Based on this, the design method of engine torque shaft and elastic shaft, as well as the longitudinal stiffness adjustment method of the mounting system are proposed. Through these two methods, the decoupling rate of the powertrain is improved, and the displacement of the powertrain when the engine starts and stops is reduced, so that the vibration of the powertrain is reduced. According to the theoretical calculation results, a sample is made and verified on the real vehicle. From the actual test results, the effect is obvious, which has guiding significance for solving practical engineering problems.

Key words: Truck; Start and stop vibration; Path analysis; Mount optimization