Structure Analysis And Optimization Of Rubber Mount For Vehicle Power Train

With the developing of economic, the improvement of road traffic environment, and the energy crisis, pollution increasingly stand out, which make the design of the car develop to the direction of big torsion and light quality. It deteriorates the character of libration and affects the comfort. Researches and experiments indicate that engine noise make up of the main component of vehicle inner noise, whose characteristic is multi-vibration sources, wide range of frequency, and complex modality. Especially domestic cars, mostly use vertical four-stroke engine, and the problem of engine vibration isolation is very serious. The control of vehicle vibration and noise is becoming more and more important for vehicle designers. So the key parts which affect the noise of power train transfer to vehicle—the design demand of engine mount system increasing higher.This paper apply finite analysis to research the design of rubber mount. This paper was based on research of the relationship between the structure design parameter of power train rubber mount and the static stiffness properties, and found a system design procedure. The following are the main achievement.①Discussed the rubber composition. Definirude the basic properties and physical performance of rubber material. Analyzed the design of composition of typical vibration isolation rubber, the physical-mechanical performance and vibration isolation characteristic. Discussed the key technology of finite element analysis and basic procedure.②According to the material property of mount rubber, selected proper materialmodel. Got rubber material parameter by processing mechanic experiment data and finite elements analyzed date with least square method.③According to a real rubber mount part, built a 3D geometry model using UG and meshed the model using ANSA. Built the finite element model of the rubber mount and applied load and other boundary condition. Analyzed the static stiffness of the rubber mount and compared the result with experiment. The comparing result showed that the material parameter of the rubber was reasonable and the finite element model was correct.④According to the structural analysis, confirmed the main geometry structure parameter of the mount, analyzed the sensitivity of the geometry structure parameter. The results showed that the axial thickness of the rubber body effected the physical-mechanical performance most, followed by the width of the rubber body, and the radial thickness effect least.⑤Optimized the structure of rubber mount by using nonlinear finite element, neural network and genetic algorithm with the target of the mount static stiffness. And the compared results between optimization and experiment showed the procedure was feasibility.