Simulation And Analysis Of The Application Effect Of Mechanical Elimination Torsion Suspension

For those high off-road vehicle that mostly work on specially rugged and complex road , dynamic loads rised by uneven ground will cause the torsion of the body and lead to the early fatigue wreck of vehicles' components,even the rupture of the body .Furthermore for the high mobility wheeled vehicles that are requested to have high off-road ability, dynamic loads rised by uneven ground will damage the performance of the contact between wheel and the ground,then directly influence vehicles' running and high-speed cross-country performance. In this situation , it's necessary to study how to avoid the deteriorate of vechile performance and the damage of vehicles' components caused by dynamic loads of uneven ground .In order to avoid the deteriorate of vechile performance and the asymmetrical distribution of wheel load caused by dynamic loads of uneven ground , lighten the torsion and dynamic loads received by the body of the vehicle , enhance the the contact between wheel and the ground, Prof. Konghui Guo invented a new kind of mechanical suspension system.Baseing on the elimination torsion principle developped by Prof. Konghui Guo, the paper researches high off-road vehicles' whole-coupling suspensionsystem of eliminating redundant constraint combining with the subproject of National Natural Science Foundation of China—"Study on whole-coupling mechanical elimination torsion suspension system". The purpose of the dissertation is to validate that , with the precondition of not reducing of controllability and stability of the vehicle ,to greatly reduce the shock stress and torsion of the body , improve the evenness of wheel loads and enhance wheel ground adhesion.The main work and advancement of this dissertation are as following:Firstly,introduce the concept of elimination torsion mechanical suspension system,and analyse its function and working theory.According to the existing condition,select the BJ2020s as prototype vehicle. With the reference of diferrent kinds of mechanical elimination torsion suspension system design proposal designed by Prof. Konghui Guo,design the joints of the mechanical elimination torsion suspension and so on, lay the mechanical elimination torsion suspension to the selected vehicle .Test the static and dynamic application effect of the mechanical elimination torsion suspension ,and analyse the movement and force of mechanical elimination torsion suspension with those four kinds of specialy road inputs.Secondly, build the virtual prototype of the BJ2020s and the BJ2020s with mechanical elimination torsion suspension with ADAMS/View .To validate the influence of handling and stability for off-road vehicles equipped with elimination torsion suspension, fulfill the Open-Loop test simulation of steady state steering and steering angle step input experment. It's easy to find through the results of simulations that the steady and instantaneous steering performances on uneven road were not damaged. IVThen, to look into the p application effect of the mechanical elimination torsion suspension ,analyze the road to several types, anylse the application effect of the mechanical elimination torsion suspension on those different road types one by one. Find out that the mechanical elimination torsion suspension works only when the inputs on the cross are not the same.the application effect of the mechanical elimination torsion suspension is,greatly reduce the shock stress of the road and the height of the body, and torsion of the body, equilibrate the wheel loads and greatly reduce the torsion of the body, enhance the contact of the wheel and the ground.Designed the road with ten pairs of symmetry heaves ,according to the GB/T12543-90,do the accelerating and braking simulation under the fixed gear .the simulation result show that performance of wheel ground adhesion of the elimination torsion mechanical suspension vehicle is better than that without mechanical elimination torsion suspension, the power of the vehicle is also enhanced.At last ,study the factors which infect the performance of the mechanical elimination torsion suspension-- speed and the friction of the joint .Those will help to the practical production of the mechanical elimination torsion suspension vehicle.