The Research Of Virtual Driving Simulator In Mountainous Region Based On Parallel Mechanism

Driving simulator is a kind of training tool which can improve the level of training as well as lowering the cost of training. At present, the most driving simulators are under urban and rural conditions, where roads are flat and occasionally have a small ramp. However, very little reported research has been found about driving simulating under complicated road conditions, especially, the mountainous region. Because of the particularity of mountain terrain, driving in this environment will cause strong bump, difficult operation and scare, which will increase the operation difficulty and risk coefficient. So, driving in mountainous region is one of the difficult training subjects. If this situation can't be timely resolved, it will have an impact on the quality of training. Therefore, it is very necessary to do some training in mountainous region pointedly.Based on this background, the paper proposes the study of three-degree of freedom driving simulator in mountainous region This simulator combined with virtual reality and parallel mechanism technology can enhance trainees' the feeling of real driving.In the first part, the paper points out the application of virtual reality in driving simulator and the simulator's current research trends home and abroad. The advantages and some design problems of various current driving simulators are pointed out. A desktop virtual reality system is proposed to realize driving simulation in mountainous region.Secondly, the function requirements of the driving simulator in mountainous region are analyzed. Then, the paper puts forward the overall system structure, system components and their partly function. Finally, it's discussed that the hardware and software needed by the system.Then, the analysis and design of the two essential components of the simulator are given in detail: the visual simulation system and the motion simulation system. For the former, the paper mainly studies the vehicle's motion characteristics, three-dimensional vehicle modeling, driving scene constructing, driving intersection test, and natural phenomena simulating. For the latter, based on the requirement of the simulator, the article analyses the mechanism design and degree of freedom, deduces mechanism kinematics equation, and puts forward the three-dimensional model of parallel mechanism as well as its motion simulation.Finally, the system software architecture and implementation are introduced in detail: using VC + + as the main programming language and calling the API functions of OpenGL and Vega to realize the function of the software system. The multi-threading technology is utilized to realize the interaction between the visual simulation system and the motion simulation system, taking the parallel mechanism motion simulation as the main window and the virtual driving simulation as the additional window. By the multi-threading technology, the paper can realize the target of parallel mechanism motion simulation following the changes in visual driving simulation real-timely.