关键词: 振动；故障诊断；悬置系统；优化

Abstract: Powertrain excitation is one of the main sources of vehicle vibration and noise, and the problems associated with it are often characterized by low frequency vibration and booming. In order to diagnosis the problem and solve the low-frequency vibration and booming problems of a vehicle under development, firstly, through the vehicle vibration test and analysis, it is determined that the resonance of the powertrain system due to the irrational mode distribution is the source of the problem. Using the genetic algorithm, the mount system is optimized. According to the engine excitation frequency, the rigid body modes of the powertrain are designed to avoid the frequency, which effectively solves the resonance problem. Finally, the mount system is calibrated for decoupling rate, static equilibrium and limiting working condition, and the vehicle vibration test is carried out to verify the effectiveness of the powertrain mounts optimization design method.

Key words: vibration; diagnosis; powertrain mounts; optimize