Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 81, Issue -, Pages 207-220Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2023.01.006
Keywords
Flexure; Design methodology; Stiffness and compliance matrices; Screw theory; Compliant mechanism library
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This paper presents a new design method called Compliant Building Elements (CBE) for generating practical flexure designs in compliant mechanisms. The CBE encodes quantitative information of a compliant system in a parametric matrix and uses the screw theory to guide the design and synthesis process. The synthesis procedure is a top-down and iterative process, starting from stage layout to optimizing the compliant connection elements and types.
In this paper, we present a new design method and principle, i.e., Compliant Building Elements (CBE), for compliant mechanisms that adopts a systematic and synthetic approach to generate practicable flexure designs. The CBE is unique in that it encodes a compliant system's quantitative information, including elasticity, geometry, location, and orientation, in a parametric matrix. Based on the matrix, a degree-of-freedom (DOF) concept is defined to describe permitted motions of a flexure; next, the screw theory is used to guide the design and synthesis of compliant mechanisms from DOF decomposition to actuator layout selection. In CBE, a compliant system consists of three types of compliant elements, i.e., compliant elements formed by serial or parallel connections and basic compliant elements. The synthesis procedure is a top-down and iterative process, starting from laying out the stage topology to finally optimizing the compliant connection elements and types (i. e., serial or parallel), where the iteration stops when the stage characteristics meet the design requirements. A library of various compliant elements is provided to help the designers quickly generate the initial stage topological designs and optimize the performance with reduced design iterations. The matrix-based design method for compliant mechanisms, i.e., CBE, which is analogous to the screw-based type synthesis for rigid parallel mechanisms, enables early-stage flexure system design via building compliant blocks just like building LEGO & REG; bricks.
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