Research On Handling Stability And Riding Comfort Of Trucks Based On Rigid-flexible Coupling Model With Flexible Frame

In recent years,China's industrial economy continues to expand and the automotive market is also heating up,so there is an ever-growing demand for heavy-duty truck.In order to develop automotive products of higher quality in short time,more efficient and accurate tool need to be used to build the truck model and study the handling stability and riding comfort of trucks.In the past,most of the research on heavy-duty truck is based on the multi-rigidbody vehicle model.However,due to the long body,big wheelbase and heavy load of heavy-duty trucks,the flexibility of the vehicle performance is very obvious.Thus,it is quite necessary to investigate the effect of the vehicle frame flexibility on system dynamics.In this dissertation,the 3D flexible frame model is built based on the finite element software ANSYS and the demands of frame strength and rigidity under bending and torsion conditions are obtained through the static analysis.Then the natural frequencies and modes of the frame are analyzed and the.Mnf file of car frame is generated.Based on ADAMS,a multi-rigidbody vehicle model is built first and then the flexible frame file is imported into ADAMS and assembled into other subsystems,so as to establish a rigid-flexible coupling vehicle model.The mass and inertia of the rigid-flexible coupling vehicle model are adjusted according to multi-rigidbody vehicle vehicle.In addition,the correctness of the rigid-flexible coupling vehicle model is verified by the test data on Daguang highway meseared by our research group.According to the national standard of handling stability test,the handling stability of vehicle on step angle,angle pulse and single lane condition are simulated using two vehicle models and the influence of frame flexibility on handling stability is discussed.Secondly,the riding comfort simulation of two vehicle model on random and impulse road are also simulated and the effect of road surface roughness and vehicle speed on vehicle riding performance is studied.Moreover,the continuous deceleration zone is established,and the responses of the rigid flexiblecoupling vehicle model running through the continuous deceleration bump are calculated,including the acceleration of vehicle body and the tire forces.And the effect of the width and height of continuous deceleration ramp on vehicle riding comfort is also researched.Under the condition of achieving good results in the speed limit and ensuring the vehicle driving stability,the results can provide the theoretical basis for the design of the bump.Through modeling and simulation analysis of the model,the vehicle development efficiency is improved and the cost of inputs is reduced.In addition,different road conditions can be established conveniently,and the effects of parameters of vehicle on handling stability and ride comfort can be researched,which will be benefical to vehicle design.