Research On Ride Comfort Of A Passenger Car

With the improvement of people's living standard,the demand of consumers for cars is no longer just to meet the functional requirements,the comfort requirements are getting higher and higher.At present,the application of virtual prototype technology in vehicle enterprises is not mature,and it is still in a stage of continuous exploration the development of vehicle ride comfort is basically accomplished by means of the chassis debugging engineer's multi-round matching debugging.This process not only wastes a lot of time and money,but also does not necessarily achieve satisfactory results.The difficulty of applying virtual prototyping technology to vehicle ride comfort is to establish a high-precision vehicle dynamics simulation model.Therefore,combining the theory with the experience of engineering development,this paper establishes a set of methods to realize the development goal of vehicle ride comfort quickly and effectively by using the virtual prototype technology in the process of new vehicle development the problem of smoothness not satisfying design in new project development is solved.At present,the virtual prototype used in the study of vehicle ride comfort is basically a multi-rigid model based on Adams,and its simulation accuracy is poor,because the actual automotive parts have a certain flexibility,the flexibility of some key parts,such as torsion beam,subframe and white body,has a great influence on the ride comfort.In this paper,a rigid-flexible coupling virtual prototype is established,which considers the flexibility of the key components,so that the simulation results are more consistent with the test results,and the simulation accuracy of vehicle ride comfort is improved.Firstly,this paper briefly discusses the development trend of automobile ride comfort and the status quo of automobile ride comfort research at home and abroad.Secondly,it studies the basic theory of vehicle ride comfort,compares and analyzes the evaluation methods of vehicle ride comfort in common use in the world and in our country,and determines that the evaluation standard of vehicle ride comfort test in our country is adopted in this paper.The modeling theory and steps of adams software,the obtaining method of parameters and variables needed for modeling and the handling method of neutral file of flexible body mode are described.The stiffness and modal of body-in-white,subframe,torsion beam and stabilizer bar are considered comprehensively.The Performance of suspension K & C of rigid-flexible coupling virtual prototype is simulated and verified by experiments.Using Ftire model with measured tire data and referring to GB / T 4970-2009,Adams / Car is used to simulate the pulse input and random input The joint simulation and optimization design of suspension stiffness and shock absorber damping is carried out by means of Isight Platform Integrated Adams / Car and Matlab.Finally,in order to test the optimization results,the ride comfort test of the prototype car is carried out,and the floor of the driver's seat and the seat of the rear seat are selected as measuring points.The test results show that the maximum acceleration response and weighted root-mean-square acceleration at the floor of the driver and the rear passenger increase with the increase of vehicle speed.The simulation results agree with the test results it is concluded that the rigid-flexible coupling virtual prototype has good precision,and the feasibility of the vehicle ride comfort analysis and optimization design method is verified.