Research on the vibration characteristics and optimization of heavy truck transmission housing under complex environment

Aiming at the excessive vibration and noise of the transmission in the test process of a heavy truck, a research programme on the vibration characteristics of the transmission case is formulated with comprehensive consideration of the operating conditions and intrinsic properties. Through the theoretical research of vibration characteristics, a complete housing vibration simulation system is constructed: firstly, the intrinsic frequency and vibration pattern are determined by modal analysis, and then the internal and external excitation sources and excitation frequency are determined on the basis of analysing the operating conditions of the transmission housing, the vibration response points are selected according to the results of the modal analysis, and frequency response analysis is carried out by combining with the excitation frequency, so as to obtain the vibration response curve of displacement. Aiming at the phenomenon of vibration response peak, multi-objective optimisation of the housing is carried out by using the compromise programming approach, and the optimisation scheme is proposed and the optimisation effect is verified. The results show that the peak vibration response is reduced after optimisation, and the problem of large vibration noise is mitigated. Meanwhile, it is verified that the research scheme has certain effect on improving the vibration characteristics of the housing, which is of some reference significance for the research and optimisation of the vibration characteristics of other structures.