摘要
为提高精密定位系统的行程,以椭圆形柔性铰链为基本变形单元提出一种大行程串联柔性机构。使用伪刚体模型法对串联柔性机构的运动过程进行了分析,进而建立了串联柔性机构的刚度和最大应力理论模型。采用超声波直线电机作为驱动元件,以单向2.5 mm行程作为设计目标,确定了串联柔性机构的结构参数,有限元分析结果与理论计算结果误差小于5%,证明设计的正确性。在此基础之上,构建了具有毫米行程的定位系统,进行了连续步进实验,实验结果证明使用串联柔性机构可以实现大行程精密定位。
To increase the stroke of precision positioning system,a large stroke series flexure mechanism based on elliptical flexure hinge is presented.The method of pseudo-rigid-body model is applied to analyze the motion process of the series flexure mechanism,and the theoretical model of stiffness and maximum stress is established.Taking the ultrasonic linear motor as the driving element,a unidirectional 2.5 mm stroke as design objectives,the structural parameters of the series flexure mechanism are achieved,the result error between finite element analysis and theoretical calculation is less than 5%,which proved the correctness of the design.A positioning system which having millimeter stroke is built,and a continuous stepping experiment is carried out,the experimental results proved that the system which could realize the precise positioning and has large stroke.
出处
《机械传动》
CSCD
北大核心
2017年第2期161-164,共4页
Journal of Mechanical Transmission
基金
河北省高等学校科学技术研究青年基金项目(QN20131048)
关键词
串联柔性机构
精密定位
刚度
最大应力
有限元
Series flexure mechanism
Precision positioning
Stiffness
Maximum stress
Finite element
