柔性铰链的转动精度改进法  

Improved Method for Rotational Accuracy of Flexure Hinges

作　　者：裴旭[1] 宗光华[1] 于靖军[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《中北大学学报（自然科学版）》2013年第2期120-123,133,共5页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50905005;51275552)

摘　　要：传统切口型铰链在转动时存在转动中心的漂移,如果柔性铰链转动角度不是很大,铰链的转动中心在沿轴向的位移远小于在垂直轴线方向的位移时,则可对柔性铰链转动中心漂移模型进行简化.提出了将连接两刚体的两个切口型铰链正交放置且让转动中心轴线重合,以便抑制柔性铰链转动中心漂移的设计方法.引入了平面虚拟转动中心运动机构,实现了铰链之间的虚拟交叉约束.使用此方法可以对不同切口形状的铰链进行改进,以提高铰链的转动精度.设计了圆弧切口和直角切口的组合铰链,通过有限元仿真与传统形式的铰链进行了比较,仿真结果证明了这种方法的有效性.The traditional incision type hinge’s rotation pivot had center-shift,when it rotated.When the rotation angle of a flexure hinge was small,the axial displacement of the hinge’s rotation pivot was far less than the perpendicular displacement.The model of center-shift of flexure hinges was simplified.A way that cross two hinges which connect two rigid body and put the hinges’ rotation center on a common axis to restrain the center-shift was brought forward.The planar VCM（Virtual Center of Motion） mechanism was utilized to realize a virtual cross restriction of hinges.By this way,different hinges could be improved,to improve the rotation accuracy.Two flexure structures which respectively consist of leaf and circle hinges were constructed,and compared with traditional flexure hinges by the finite element analysis software.The analysis results show that the method can improve the rotation accuracy.

关 键 词：柔性铰链 转动精度 轴漂 虚拟转动中心 

分 类 号：TH112[机械工程—机械设计及理论]