Simulation Analysis And Improvement Of Car Ride Based On Virtual Prototype

NVH (Noise, Vibration and Harshness) is a comprehensive issue reflecting the vehicle dynamics. As one of the evaluation indexes of NVH, car ride mainly concerns the uncomfortable feeling of passenger caused by vibration. In order to improve the ride comfort of a car, the virtual prototype in ADAMS/Car and the pavement model are built for simulation analysis of car ride. Simulation is carried out based on the standards related and the results are discussed in depth, and several solutions about improving car ride are proposed based on the analysis.Firstly, based on the analysis on the international standard ISO2631 and the national standards on ride evaluation, the evaluation indexes used in this thesis are chosen as uncomfortable parameter, suspension working space and dynamic tire load.Secondly, the virtual prototype of the car is built in ADAMS/Car for simulation analysis. To assure that the virtual prototype shows the dynamics of the physical prototype, several key parameters are reset,especially the characteristic curves of the suspension springs and dampers, and wheel alignment parameters. The model proved to be correct through the static equilibrium test.Moreover, ride simulation is carried out under different speeds and pavement conditions, and uncomfortable parameter, suspension working space and dynamic tire load are obtained, and their weighted RMS can also be calculated for ride comfort analysis. The simulation results are compared with the evaluation standard, and the ride performance of the car can be acquired.At last, from the aspect of suspension parameter matching, several solutions about improving the ride comfort performance are presented, and the feasibility of each solution is analyzed, respectively.To sum up, this thesis practiced the method of car ride evaluation based on the virtual prototype technology, and the car ride is evaluated by simulation, and further, the solutions of improving the car ride is discussed in depth. The evaluation results shows that the car has a good ride comfort at low and middle speed, the ride performance at high speed needs to be improved, which is in accordance with the fact. The results about ride-improving solution indicate that air suspension improve car ride performance essentially.