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基于解域的四位置空間RCCC機構(gòu)綜合
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國家自然科學基金項目(51275034)


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

    將Burmester理論從平面及球面拓展到一般空間領(lǐng)域,,給出了空間RCCC機構(gòu)的一種綜合方法,。一般情況下,,綜合RCCC機構(gòu)最多能給定連桿的3個位置,。而4C機構(gòu)的四位置綜合可以得到無窮多解,,因此可先建立4C機構(gòu)無窮多解的解域,再在解域中找到主動桿與機架間C副無滑動位移的點作為R副,,從而得到RC連架桿,,最終獲得RCCC機構(gòu)。具體方法為:首先根據(jù)給定的4個位置的姿態(tài)角求解出滿足要求的解曲線,,并根據(jù)解曲線建立球面4R機構(gòu)解域,。其次在球面4R機構(gòu)解域上選取一點作為RCCC機構(gòu)運動副軸線方向的矢量,再與給定的4個位置的空間坐標結(jié)合求解出滿足要求的解直線,,進而根據(jù)解直線建立空間4C機構(gòu)的解域,。最后在空間4C機構(gòu)的解域圖中找到通過4個位置時主動桿與機架間C副無滑動位移的點作為R副,構(gòu)成滿足要求的空間RCCC機構(gòu),。本文最后通過給出的數(shù)值示例證明了該方法的正確性和有效性,。

    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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曹陽,韓建友.基于解域的四位置空間RCCC機構(gòu)綜合[J].農(nóng)業(yè)機械學報,2016,47(8):399-405. Cao Yang, Han Jianyou. Synthesis of RCCC Linkage to Visit Four Given Positions Based on Solution Region[J]. Transactions of the Chinese Society for Agricultural Machinery,2016,47(8):399-405.

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  • 收稿日期:2016-01-19
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  • 在線發(fā)布日期: 2016-08-10
  • 出版日期: 2016-08-10
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