Design of a Family of Ultra-Precision Linear Motion Mechanisms
Design of a Family of Ultra-Precision Linear Motion Mechanisms
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DOI：
10.1115/1.4007491
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Hongzhe Zhao;S. Bi;Jingjun Yu;Guo Jun
中科院分区：
文献类型：
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作者：
Hongzhe Zhao;S. Bi;Jingjun Yu;Guo Jun
并联四杆机构(PFBM)的寄生运动是设计者不希望看到的。本文将PFBM中的刚性关节替换为相应的挠性关节，并充分利用转动挠性支点的中心位移来补偿这种寄生运动。首先，提出了三种方案来设计一类超精密直线运动机构。因此，采用广义交叉弹簧支点作为节点，得到了六种构型。然后，针对这些构型的寄生运动，给出了补偿条件，给出了几何参数的设计空间。此外，还对这些配置的特性进行了评估，并进一步提出了改进其性能的方法。此外，还开发了一个模型来对寄生运动和初级运动进行参数预测。最后，通过有限元分析对分析模型进行了验证，表明这些直线运动机构可以应用于精密工程中。
The parasitic motion of a parallel four-bar mechanism (PFBM) is undesirable for designers. In this paper, the rigid joints in PFBM are replaced with their flexural counterparts, and the center shift of rotational flexural pivots can be made full use of in order to compensate for this parasitic motion. First, three schemes are proposed to design a family of ultraprecision linear-motion mechanisms. Therefore, the generalized cross-spring pivots are utilized as joints, and six configurations are obtained. Then, for parasitic motion of these configurations, the compensation condition is presented, and the design space of geometric parameters is given. Moreover, the characteristic evaluation of these configurations is implemented, and an approach to improve their performances is further proposed. In addition, a model is developed to parametrically predict the parasitic motion and primary motion. Finally, the analytic model is verified by finite element analysis (FEA), so these linear-motion mechanisms can be employed in precision engineering.