Multibody Dynamics Simulation Of Suspension Considering Nonlinear Constitutive Characterizations Of Bushing

Rubber bushing in automobile chassis system is very important, its mechanicalproperties have a great influence on vehicle dynamic performance. Distributed drive electricvehicle is powered by electric in-wheel motors, different from the traditional arrangement ofmotor vehicles, the factors that high frequency vibration brought by the electric motors andthe increase of unsprung mass, make a very significant impact to the performance ofsuspension system. In the process of analyzing distributed drive electric vehicle suspensionsperformance, dynamic simulation software ADAMS characteristics linear bushing modelhave been unable to meet design needs. Therefore, building a considering nonlinearity ofrubber bushing suspension multibody dynamics model is essential.This article built a model and simulated for the distributed drive electric vehiclesuspension system. Main contents include the following aspects:First of all, on the mechanical properties of rubber materials and rubber bushingprovides an overview, explained the rubber materials and rubber bushing relevance offrequency, amplitude and temperature influence on the mechanical properties. Then brieflydescribed the current developments in the study of the theoretical model of rubber bushing.Secondly, take a experimental study on the vulcanizate bushing, test the mechanicalcapabilities of rubber materials in static and dynamic. Set up the temperature control ofrubber materials under uniaxial tensile test-bed for the static tensile test. Under differenttemperatures, perform uniaxial tensile test to the rubber samples, and acquire experimentaldata of hyper-elastic rubber materials. Take dynamic mechanics experiment for thevisco-elasticity of vulcanizate, get the response of temporal correlation and temperaturedependece of vulcanizate. Then, a static and dynamic mechanical properties of rubberbushing is performed, obtained rubber bushing stiffness experimental data and dynamic stiffness experimental data.Thirdly, according to the experimental data of rubber materials, fitting the experimentalcurves and get hyper-elastic and viscoelastic parameters of rubber materials. Establish thefinite element model of a rubber bushing in finite element simulation software ABSQUS, bycontrasting the consequence of simulation with the experimental data of bushing, to verifythe accuracy of finite element model. Further simulation on the finite element model, got arubber bushing stiffness data in six directions.Then, study on theoretical model of rubber bushings, according to the practical needs ofthis project has selected a theoretical model of rubber bushing which consist of ahyper-elastic unit, a visco-elastic unit and a friction unit, called as the three-componentmodel. Using the bushing stiffness data from simulation and analysis, based on thethree-component model of rubber bushing, make parameters identification in the sixdirections of rubber bushing, get rubber bushing parameter data in different directions underdifferent temperatures.Finally, using ADAMS/Car, simulation analysis of control modules, build adouble-wishbone front suspension model which towards distributed drive electric vehicle.Developed by ADAMS for the second, the GFOSUB program of ADAMS software wasused to construct the three-component model. Expressed the mechanical properties of rubberbushings precisely in the suspension. Then, performed the static K&C test to verify thecorrectness of the established suspension model. Simulated the suspension model underdynamic vibration, validated models can truly reflect the rubber dynamic characteristics. Inaddition, got the changing curves under different temperature of rubber bushing throughsimulation, verified the rubber bushing stiffness under different temperature make a obviouseffect on the character of suspension. It could provide a guidance for optimization design ofrubber bushings.