Lattice flexures: Geometries for stiffness reduction of blade flexures
Lattice flexures: Geometries for stiffness reduction of blade flexures
复制标题
DOI：
10.1016/j.precisioneng.2016.02.007
复制
发表时间：
2016-07-01
影响因子：
3.6
通讯作者：
Howell, Larry L.
中科院分区：
文献类型：
--
作者：
Merriam, Ezekiel G.;Howell, Larry L.
减小柔顺机构的运动方向刚度减少了它们的致动努力并简化了相关的静态平衡机构。这项工作介绍了一种弯曲类型称为晶格弯曲，并评估其一些基本属性。当与类似尺寸的传统矩形截面叶片挠曲件相比时，格状挠曲件具有减小的弯曲刚度。运动方向的弯曲刚度的两个晶格弯曲类型，称为X型和V型，解析推导，与有限元分析证实，并验证与测量的物理原型。晶格弯曲有可能将一些柔顺机构的弯曲刚度降低60- 80%，如使用3D打印技术制造的设备所示。结果表明，一些网格弯曲表现出的扭转/弯曲刚度比高达1.7倍高于相等的纵横比叶片弯曲，和横向弯曲/运动方向的弯曲刚度比高达6.5倍高于相等的纵横比叶片弯曲。(C)2016 Elsevier Inc. All rights reserved.
Reducing the motion-direction stiffness of compliant mechanisms reduces their actuation effort and simplifies associated static balancing mechanisms. This work introduces a flexure type called lattice flexures and evaluates some of their fundamental properties. Lattice flexures have a reduced bending stiffness when compared to traditional rectangular-section blade flexures of similar size. The motion-direction bending stiffness of two lattice flexure types, called X-type and V-type, are analytically derived, corroborated with finite element analysis, and validated with measurements of physical prototypes. The lattice flexure has the potential to reduce the bending stiffness of some compliant mechanisms by 60-80%, as demonstrated in devices manufactured using 3D printing technologies. It is shown that some lattice flexures exhibit a torsional/bending stiffness ratio as much as 1.7 times higher than an equal aspect-ratio blade flexure, and a transverse bending/motion-direction bending stiffness ratio up to 6.5 times higher than an equal aspect-ratio blade flexure. (C) 2016 Elsevier Inc. All rights reserved.