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| 1 | Symmetric Equations for Evaluating Maximum Torsion Stress of Rectangular Beams in Compliant Mechanisms显示文摘There are several design equations available for calculating the torsional compliance and the maximum torsion stress of a rectangular cross-section beam, but most depend on the relative magnitude of the two dimensions of the crosssection(i.e., the thickness and the width). After reviewing the available equations, two thickness-to-width ratio Independent equations that are symmetric with respect to the two dimensions are obtained for evaluating the maximum torsion stress of rectangular cross-section beams. Based on the resulting equations, outside lamina emergent torsional joints are analyzed and some useful design Insights are obtained. These equations, together with the previous work on symmetric equations for calculating torsional compliance, provide a convenient and effective way for designing and optimizing torsional beams in compliant mechanisms. | Gui-Min Chen Larry L.Howell | 2018 | Chinese Journal of Mechanical Engineering2018，31，1： | 3 |
| 2 | 柔顺杆件固定-导向1P2R伪刚体模型显示文摘针对固定-导向模式的伪刚体模型模拟柔顺杆件末端位置精度不高且无法表现轴向变形的问题,基于伪刚体模型的原理提出了一种高精度的固定-导向1P2R伪刚体模型。首先综合考虑柔顺杆件各个方向的变形,构建了包含两个转动副和一个移动副的固定-导向1P2R伪刚体模型;其次建立了该模型的运动学方程,并根据优化算法求解了伪刚体模型的最优特征半径系数,利用一元线性回归方法得到了该模型的弹簧和扭簧刚度系数;最后通过数值算例模拟固定-导向1P2R模型末端的动作路径,并将其与固定-导向伪刚体模型及柔顺杆件的末端路径进行对比。结果表明,固定-导向1P2R伪刚体模型完全能够模拟相应柔顺杆件的末端动作过程,且模拟精度高于固定-导向伪刚体模型。研究证明了该模型的优越性,对柔顺机构的变形分析亦有重要参考意义。 | 刘凯 曹毅 葛姝翌 丁锐 | 2018 | 机械设计2018，35，2： | 0 |
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