平面3- RPR并联机器人正运动学的退化研究
Degeneracy study of the forward kinematics of planar 3-RPR parallel manipulators
摘要：
研究了平面3-RPR并联机器人正运动学退化的两种情况。这些情况以前没有处理过。当三个输入关节变量r1、r2和r3满足一定关系时，出现第一退化。这种简并性产生t中特征多项式的二重根，这可能被错误地解释为两种聚结组装模式。但是，与非退化情况不同的是，这个二重根产生平台位置坐标（x，y）的两组解。在第二种情况下，我们表明，正运动学退化在整个关节空间，如果基地和平台三角形是全等的和平台三角形旋转180度左右的一个方面。对于这些“退化”的机械手，这是第一次定义，正运动学减少到解决一个三次多项式和二次方程的顺序。这样的机械手构成，反过来，一个新的家庭的分析平面机械手，将更适合于工业应用。
英文摘要：
This paper investigates two situations in which the forward kinematics of planar 3-RPR parallel manipulators degenerates. These situations have not been addressed before. The first degeneracy arises when the three input joint variables r1, r2 and r3 satisfy a certain relationship. This degeneracy yields a double root of the characteristic polynomial in t, which could be erroneously interpreted as two coalesce assembly modes. But, unlike what arises in non-degenerate cases, this double root yields two sets of solutions for the position coordinates (x, y) of the platform. In the second situation, we show that the forward kinematics degenerates over the whole joint space if the base and platform triangles are congruent and the platform triangle is rotated by 180 deg about one of its sides. For these "degenerate" manipulators, which are defined here for the first time, the forward kinematics is reduced to the solution of a 3rd-degree polynomial and a quadratics in sequence. Such manipulators constitute, in turn, a new family of analytic planar manipulators that would be more suitable for industrial applications.
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