Isolating Performance Analysis And Optimal Design Of Automobile Power-train Mount System

With the developing of science and technology, people's requirement on the riding comfort of automobiles is increasing, and nicer smoothness and low noise are an important symbol of present-day automobiles. Automobile power-train is one of main vibrations which often result in passenger's uncomfortable. The optimal capability of designing a mount system of automobile power-train has directly an influence on automobile's smoothness and reducing noise. In order to improve the isolating performance of power-train mount system of one light truck, a 6-DOF dynamical equation of the power-train mount system is established in the paper. The basic dynamical parameters of the power-train mount system and precision are validated by the vibration experiment on the testing rig and the method of parameter identification on base of the method of least square of power spectrum, which provides a basis for accounting power-train mount system in the theory and optimization. For robust design of the power-train mount system, the main parameter sensitivity relative to isolating performance of the power-train mount system is presented and influences of the parameter sensitivity on isolating performance are discussed by the analysis, numerical simulation and design of orthogonal test(Taguchi Methods). Lastly, a practical optimum design is made by penalty function method and Genetic Algorithm, in which uncoupling of energy and minimum of reactive force at mounts' location and robust design are multi-objective functions. To compare with the original vehicle, the results of the numerical simulation and the experiments in proving ground for one light truck with the optimal design power-train mounts showed that the isolating performance of the power-train mount system has been significantly improved. The results and methods of the study are helpful for the design of automobile power-train mounts or other similar isolating mount systems.