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According to the 3 Dimension model of the side member frame, a finite element analysis (FEA) model of semi-trailer tractor frame was established and the approach of applying loads and constraints was discussed. Then the frame stress was analyzed under four working conditions as well as the eigen frequency was calculated too. It was found that the maximum stress appeared on the rear channel side-rail under the bending and twisting condition, however it still meets the strength requirements. Natural vibration frequency is far away from the exciting force's frequency such as the suspension vibration and the engine incentive. The harmonic analysis results shows that the significant stress appeared on the connection part of the channel side - rail and the second cross beam, the balance beam axis, tubular cross member.

A nonlinear finite element analysis model was established for the rubber boot of shift lever of a vehicle using software MSC.MARC. Then based on the Mooney-Rivli constitutive model of rubber materials, the method for determining the characteristic parameters of the rubber material was obtained. The parameters of the material for the finite element model were obtained from a tensile test for a standard sample. According to the data obtained, the stress and strain relationship of the rubber boot under different conditions was got through calculation based on the finite element analysis. Additionally, it was discovered that the original structure had stress concentration and touch interference. Ten optimization schemes were presented for modifying the structural parameters, and the stresses and strains under different conditions were calculated. Finally, the optimized structural parameters of the boot were determined.

There are three steps to establish the virtual proving ground. First make up the VPG screen with 2D and 3D graphics by using MultiGen Crater™. Then the graphics and model were loaded and the virtual testing ground similar to the real world was created through the OpenGVS software. The vehicle model is disassembled into six parts according to the freedom degrees to ensure its reasonable movement while running in the virtual test ground. Finally the established vehicle model is tested.

This paper presents a visual simulation method for vehicle ride comfort evaluation. First, a 3D vehicle virtual prototyping model is built using ADAMS. With totally 596 degrees of freedom, this model incorporates every major factor that influences the vehicle ride comfort. Based on the virtual model, time domain simulations on random road inputs are further carried out and the vehicle dynamic characteristic parameters are obtained. Then, referencing a real proving ground, a ride comfort testing graphics database that contains road surfaces, rivers, grass, houses, trees, cordilleras and so on, is developed. After setting and programming resources such as graphic frame buffer, channel, scene, light, camera facility, a virtual proving ground that is able to simulate the real world, real color, and light is established. Finally, OpenGVS SDK program tool is used to call virtual proving ground and vehicle model database.