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To determine workspace and relationship between the workspace and geometry of parallel manipulator is important for optimum design of parallel manipulators. In this paper, the workspace and the relationship between the workspace and the geometry of 3-UPU parallel manipulators with pure translation axe investigated. Geometric and non-geometric constraints are defined and taken account of in determining the workspace of the translation 3-UPU manipulators. A direct average condition number is used as the global performance index of the workspace. This research shows that there exists an optimal value of the direct average condition number favorable for a good design of parallel mechanisms. The results presented in this paper are useful for the optimum design of 3-UPU parallel manipulators.  相似文献   
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着底式深海天然气水合物钻采工具的科学问题与开发战略   总被引:2,自引:0,他引:2  
简述了DSDP、ODP科学钻探计划在深海钻、采方面的成功实践及不足 ,提出了直接固定在深海海底的天然气水合物钻采工具的基础科学问题及其开发战略。  相似文献   
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