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Type Synthesis, Kinematic Analysis, and Optimal Design of a Novel Class of Sch?nflies-Motion Parallel Manipulators

机译:一类新型Schnflies-Motion并联机械手的类型综合,运动学分析和优化设计

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A novel class of spatial four degree-of-freedom Sch?nflies-motion parallel manipulators with four identical subchains is presented. Their features are that each serial subchain undergoes the pure Sch?nflies motion without redundant joints. The parallel mechanisms possess the simplest topology and are suitable for pick-and-place operations. Kinematic analysis of the 4-${{rm PRP}_{rm a}{rm R}}$ parallel manipulator, including its inverse and forward kinematics, singularity, and workspace, is discussed in detail. The analysis shows that the moving platform and the base must be in dissimilar dimension for good manipulability performance. The optimal design of the parallel manipulator is formulated as a multiobjective optimization problem. A novel performance index characterizing the approximation of the generated workspace to the prescribed regular workspace, the regular workspace share, is proposed to serve as one of the design objectives. The other objective is the global condition index, which measures the manipulability. The multiobjective optimization problem provides multiple optimal solutions for choice. Simulation verifies that the designed parallel manipulator can approximate the prescribed regular workspace with good condition index.
机译:提出了一种新型的具有四个相同子链的空间四自由度摆动运动并联操纵器。它们的特征是,每个串行子链都经过纯链状运动,而没有多余的关节。并行机制具有最简单的拓扑结构,适用于拾取和放置操作。对4- $ {{rm PRP} _ {rm a} {rm R}} $ 并联操纵器的运动分析,详细讨论了它的逆向和正向运动学,奇点和工作空间。分析表明,移动平台和基座的尺寸必须不同,以实现良好的可操纵性。并联机械手的优化设计被表述为一个多目标优化问题。提出了一种新颖的性能指标,该指标表征了所生成的工作空间与规定的常规工作空间(即常规工作空间份额)之间的近似性,以此作为设计目标之一。另一个目标是全局条件指数,该指数衡量可操作性。多目标优化问题为选择提供了多个最佳解决方案。仿真验证了所设计的并联机械手能够以良好的条件指数近似规定的常规工作空间。

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