| Virtual Prototyping (VP) is the technologies of creating the digital model of the physical prototype and further more testing and evaluating the model. Coupled with advanced modeling, collaborative simulation and analysis in various areas, information integration and management, and virtual reality technologies, in our country, many projects for VP granted by the National High Technology Research and Development Program have paved the way for VP research and its applications.Fruit-harvesting robot is the vital important equipment of precision agriculture in the 21st century and future trend of intelligent agricultural machinery. A mobile harvesting robot consists of manipulator, end-effectors, mobile platform, machine vision and control system and so on. Mobile platform is basic parts of harvesting robot. Aim to the problems that exist in traditional design mode of mobile robot, for example the research cycle is long, the cost is high and the performance test is complex etc. Virtual prototype technology is led into study of mobile platform. The following research works are completed:1. The basic feature of virtual prototype technology is introduced, major contents and difficulties are pointed out in the paper. The present research situation of virtual prototyping technology at home and abroad is summarized; the necessity and significance of applying virtual prototyping technology to the study of mobile robot are proved.2. At first, the functional requirements of the mobile platform are analyzed, the scheme of the platform is put forward, then its mechanic transmission system is designed and calculated, the parameters of the key parts of the chain drive is made certain, and furthermore, Usage performance evaluation including steering sensitivity, over-obstacle ability, driving placidity, static stability, terrain-ability etc., is built up and used as evaluation criterion. Then aimed at steering capability, the virtual prototype of the platform is constructed, simulated and optimized using ADAMS.3. The 3D modeling method of mobile platform with Pro/E software is studied, the technology on modeling and virtual assembly is summarized, the 3D model is built and interferential test of assembly in Pro/E environment is completed, including the part is intervene whether or not, the position and reassembled relation is reasonable or not and the overall structure is looked beautiful or not etc.4. The connection technology of Pro/E and ADAMS is studied, the virtual mobile robot prototype is constructed in ADAMS environment, study of the virtual prototype is completed and its working performances are analyzed.5. FEA (Finite Element Analysis) is used to analyze key working parts of the mobile robot, their weak points are found and corresponding improvement method is given.
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