| With the development of economic and the improvement of road traffic environment, aswell as the problems of energy and pollution becoming increasingly prominent, the designmakes the car toward the big torsion and lightweight direction, which largely deteriorates thevibration characteristics of the car and seriously affects the vehicle’s comfort. Vehiclevibration and noise control are becoming the primary problems to solve by automotivedesigners. Researches and experiments indicate that engine noise make up of the maincomponent of vehicle inner noise, so the design requirements of the key components to isolatethe vibration and noise of powertrain delivered to inner vehicle the engine mount system areincreasingly high. Because of the advantages: low-cost, compact structure, good technology,easy to maintain etc. the rubber mount is still widely used in domestic. In this paper, theresearch object is automotive powertrain rubber engine mount and the calculation method forstatic stiffness properties is studied combining the analytical method and the finite elementmethod.The relationship between the structure design parameters of power train rubber mountand the static stiffness properties is researched, based on which, a systematic design procedureof rubber components is proposed. The final achievements may be able to provide thenecessary reference for development and design on rubber mounts at the primary stage,shorten the research and development time and reduce the production costs.The main research contents are as follows:（1）The developing histories of the engine mounting system and the rubber isolators areillustrated after reading large quantities of papers. The static properties calculation methods ofrubber isolators are summarized. The structure type and applied range of rubber isolators arepresented in this dissertation.（2）The theory of nonlinear finite element software and rubber material properties arelearned. The CAE simulation analysis methods of rubber mounts is researched and theprocedure is summarized.（3）The three-dimensional geometric models of two types of rubber mounts areestablished by UG software and the finite element modes (FEM) are established by HyperMesh. Then the FEMs are imported into ABAQUS software and the force versusdisplacement relations in three vertical directions are calculated after the material properties,constraints and loads are defined.（4）According to the actual working load of rubber isolator, the experimental stiffness iscombined by the testing force and displacement in the MTS833three axial elastomeric testingsystems.（5）The experimental stiffness and the finite element simulation results are compared toanalyze the factors which would affect the accuracy of the estimated stiffness.（6）Based on the accuracy of the simulation analysis of rubber mounts’ three axialstiffness and combining the empirical formulas, several stiffness calculation formulas forcommon rubber mounts are derived.（7）Finally, for making the application more convenient, the interface to calculate theseveral common types of rubber suspension stiffness is designed based on MATLAB/GUIsoftware. |
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