Analysis And Optimization Of All - Terrain Vehicle Frame And Front Suspension System

In recent years, as a emerging industry, all terrain vehicle(ATV) has sustained its development in our country. With the growth of life level and enterprise competition both domestic and overseas, the requirements of the structure and performance are also getting higher and higher. The frame, as an important part and the main supporting part of all-terrain vehicles, its structure performance is directly related to the safety performance of the vehicle. And the frame lightweight design has an important research significance and practical utility for saving materials, reducing cost, improving the performance and competitiveness of products of ATV. ATV drive working conditions are complex, it has a higher request on steering stability and straight driving performance when driving. Therefore, to do the simulation analysis and related optimization on front suspension system of ATV to ensure the performance parameters of the front suspension comply with the design requirements, improved the performance of suspension and met the demands of ATV driving.This paper selected a type of multifunctional ATV as the research object. First of all, according to the FEM method to do the modal analysis and the structural analysis under typical working conditions. Built a3D model of the vehicle frame by using software CATIA, And then using the software Hypermesh to import the model to clean-up geometry, mesh to build the FEA model. Used RADIOSS solver to calculate the free modal of the frame, analyzed the inherent frequencies and vibration mode and authenticate that the frame resonance phenomenon will not occur. Analyzed the stress and strain of the ATV under the typical working conditions (bending of full load condition, torsion of full load condition), get the distribution of stress and strain of the frame. The checked performance of the vehicle frame’s structure basically met the design requirements.Secondly, based on the result of vehicle frame structure analysis, choose the thickness of the parts of relatively lower frame structure stress as design variables. Set up permissible stress of vehicle frame material for the boundary constraints, confirmed the volume of the optimized target is minimize. Used the method of size optimization to optimize the frame in OptiStruct. The total weight of the frame is reduced, and provide a feasible lightweight design scheme for the company.Finally, built the model of ATV front suspension system by using the software ADAMS/Car, analyzed the performance parameter of the front suspension and obtained kinematics variation law in travel of the wheel alignment parameters along with wheel beating in the parallel wheel. Knew that the variation range of the wheel camber angle is relatively larger and must be optimized. Then, combined with the sensitivity analysis of the front suspension performance parameters by using module ADAMS/Insight to optimize them. After the optimization, the wheel camber change interval is largely decreased and met the requirements of the design of the suspension and improved the performance of the suspension.The results proved that:through the lightweight design, the total weight of the frame reduced from172.85kg to118.62kg, And31.4percent is totally reduced, changed the interval of camber angle from-1.60°-1.64～to-0.51°～-0.42°after optimization. The research of this paper improved the dynamic performance, straight line driving stability and operation stability of ATV.