基于解域的四位置空间RCCC机构综合
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国家自然科学基金项目(51275034)


Synthesis of RCCC Linkage to Visit Four Given Positions Based on Solution Region
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    摘要:

    将Burmester理论从平面及球面拓展到一般空间领域,给出了空间RCCC机构的一种综合方法。一般情况下,综合RCCC机构最多能给定连杆的3个位置。而4C机构的四位置综合可以得到无穷多解,因此可先建立4C机构无穷多解的解域,再在解域中找到主动杆与机架间C副无滑动位移的点作为R副,从而得到RC连架杆,最终获得RCCC机构。具体方法为:首先根据给定的4个位置的姿态角求解出满足要求的解曲线,并根据解曲线建立球面4R机构解域。其次在球面4R机构解域上选取一点作为RCCC机构运动副轴线方向的矢量,再与给定的4个位置的空间坐标结合求解出满足要求的解直线,进而根据解直线建立空间4C机构的解域。最后在空间4C机构的解域图中找到通过4个位置时主动杆与机架间C副无滑动位移的点作为R副,构成满足要求的空间RCCC机构。本文最后通过给出的数值示例证明了该方法的正确性和有效性。

    Abstract:

    The generalization of spherical rectification theory was considered to spatial RCCC linkages to visit four given positions. The problem of synthesis of spatial four-bar linkages of the RCCC type for rigid-body guidance with four given positions was focused, in which R denoting a revolute, C denoting a cylindrical kinematic pair. While synthesis equations for CC and RC dyads were available in literatures, the synthesis of spatial RCCC four-bar linkages required special attention due to its asymmetric topology. However, infinitely many exact solutions to the problem of CC-dyad synthesis existed for the four-pose rigid-body-guidance problem, the RC-dyad synthesis admitted only approximate solutions, thus the RCCC linkage was capable of visiting four positions. A solution region theory was proposed to synthesis a RCCC linkage which was to visit four positions. Firstly, the expression of spherical Burmester curve and the classification was given to make a solution region. The second solution region (moment solution region) was born follow-up by picking a point on Burmenster curve solution region. Secondly, the second region which also was the spatial 4C linkage solution region, while the linkage was 2-DOF. Through restricting the prismatic joint between drive and ground on spatial 4C linkage solution region, a spatial RCCC linkage which can visit four given positions was got. Finally, two examples were given which proved that the theory was validated and correct.

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曹阳,韩建友.基于解域的四位置空间RCCC机构综合[J].农业机械学报,2016,47(8):399-405.

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  • 收稿日期:2016-01-19
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  • 在线发布日期: 2016-08-10
  • 出版日期: 2016-08-10