For The Development Of New Type Of Three Degrees Of Freedom Dynamic Simulation Platform

Parallel mechanism has been the focus of research at home and abroad，anddynamic simulation platform is a kind of it, mainly used in the field of motionsimulation. Zhao Dingxuan professor at Jilin university in China has beencommitted to the development of the parallel motion platform with three degreesof freedom and six degrees of freedom，whose hydraulic system is based on theservo valve.Its system performance is higher, and it is mainly applied in thedynamic simulation for aerospace flight simulator, but the cost is higher. LiQibai professor at South China university of technology has developed a motionplatform with three degrees of freedom in which electro-hydraulic proportionalcontrol system is used. But its dynamic performance has not been done furtheranalysis and demonstration.The new-type dynamic simulation platform with three degrees of freedomwhich is studied in this paper is derived from BONAKIA Co., Ltd in Beijing.There is a problem for a type of dynamic seat with three degrees of freedom ofthe company that authenticity of experience is decreased since interferenceoccurs when mechanisms are moving and switch valve is used in the hydraulicsystem. In order to solve this problem, a new kind of Electro-hydraulicproportional parallel platform with three degrees of freedom were developed bydrawing lessons from domestic related research and development experienceand considering two aspects factors about the cost and performance of thedynamic simulation platform in paper, which can solve the problem ofmechanism interferenceeffectivelyand reduce the development costs under thepremise of satisfying the working condition.Aiming at the new-typemechanism, a real-time control software isdeveloped，which makes Visual C++and OpenGL as his developing softwareand makes Windows operating system as developing platform. This3danimation simulation and real-time monitoring softwarefor movementsimulation platform with three degrees of freedom, which is based on OpenGL3d animation technology, can be used for three dimensional animation demonstration, simulation and real-time monitoring of the platform with threedegrees of freedom. It can observe interference points in real time to provide thebasis for improving control program, solving the problem of mechanisminterferenceeffectively.In order to realize3d dynamic simulation based on Visual c++andOpenGL, control program must be added to3d model. But the premise ofcontrol is the kinematics theory analysis to the mechanism, so in this paper, it isgiven theoretical analysis that kinematics inverse solution of new-typemechanism platform. At the same time furthermore position inverse solutionalgorithm is developed and a C program based on v c++platform is written.Trajectory planning is carried on the basis of position inverse solution algorithm,and the corresponding program is developed. Secondly, the necessary controlmodule is added for3d dynamic simulation software. New electro-hydraulicproportional hydraulic system and computer control system are designed.Inaddition, a PID controller is designed for electro-hydraulic proportionalhydraulic system, and dynamic performance of system containing controller isanalyzed in detail.