The Study Of Vehicle Handling-Stability Virtual Experiment System

With the development of virtual prototyping and virtual reality technology, the vehicle virtual experiment system is put forward. With virtual environment simulate complicate real environment, in virtual environment, users can control the vehicle and do experiment, experience vehicle performance and acquire the subjective response. Vehicle parameters are modified and the vehicle performance is optimized. Compared to the traditional vehicle experiment, the virtual experiment can be easily repeat and no risk. It has time-saving, cost-cutting and quality-improving advantages. In this paper, the vehicle virtual experiment system is designed, virtual environment is created, the handling-stability virtual experiment is realized and the comparison between virtual experiment and real experiment is carried out. The main research achievements are as follows:First, the virtual vehicle experiment system is designed using advanced technology, which is openness, extendable and reusable. Two different immerse systems are analyzed, with the help of hardware (Graphics Workstation, Stereo Vision Glasses, Control device) and software (WorldTooIKit, Visual C++6.0), a Desktop handling-stability virtual experiment system has been success developed.Second, Based on the characteristic of handling-stability performance and the Santana structure. The parameter 3D model of vehicle is success created, which includes suspension, steering, tire etc. according to the mechanism of ADAMS closed-loop control, the Closed-loop experiments are designed. Dynamic simulation is realized and the simulate data is used to realize virtual experiment.Third, In order to solve complicate control of the vehicle movement and the separation between the vehicle movement and model, the hierarchical structure of virtual environment is created and the data process module is developed using object-orientated programming method. In order to improve the realistic of scene and not to affect the real-time performance, the methods of texture, LOD (Level of Detail), Instance are adopted.Fourth, In order to analyze vehicle performance better, the vehicle 3D model, parameters meter and virtual scene are combined. Viewpoint change, interactive behavior, collision detection are made. During the process of simulation, users can observe the vehicle in different direction, obtain the accurate parameters of the motion vehicle, Using AGC-ViewerG stereo vision system, users can immerse in the virtual experiment and experience the vehicle performance.Finally, the real experiments of Handling-stability (such as the Double Lane Change, the Pylon course Slalom) are carried out. Compared with the virtual experiment, the result shows that the virtual experiment is consistent to real experiment. Therefore, the virtual experiment can reflect real experiment.Since the development of vehicle virtual experiment system is a long-term project. The work in this thesis explores the project feasibility. With the development of computer, sensor technology, virtual technology, virtual vehicle experiment will play more and more important role in the vehicle development and have a good development sight.