关键词: 车辆工程, 虚拟样机, 悬架, 抗点头性能, 抗抬头性能

Abstract: In the light of the poor antidive and antilift performances of a certain SUV,virtual prototype models of its front and rear suspension systems were built using the virtual prototype technique.Their kinematic and dynamic behaviors were revealed through simulations.The hardpoint of the guide mechanism of the front suspension system in the simulation model was modified under the condition of minimal possible modification of the components.The simulation results show that when the connection point of the lower control arm with the front body is pulled down by 20 mm,the vehicle antidive and antilift performances are improved by 80% and 30% respectively.In order to check the effect of the modification on the vehicle handling and stability,a complete virtual prototype model was built for the vehicle,the virtual prototype and real vehicle tests about the vehicle steadystate circular response were performed according to the China national standard,and both results were in a good agreement,validating the proposed virtual prototype model.Furthermore,the virtual tests of the steer release and step steer were performed on the complete vehicle virtual prototype model before and after the hardpoint modification of the front suspension system,showing that the modification has little effect on these performances.Therefore,the proposed modification on the front suspension hardpoint is acceptable.

Key words: vehicle engineering, virtual prototype, suspension, antidive performance, antilift performance