A METHODICAL APPROACH TO THE DESIGN OF COMPLIANT MICROMECHANISMS

Abstract

At micro level, compliant mechanisms-flexible structures that generate desired motions through elastic deformation-provide a superior alternative to simple cantilever and diaphragm based flexible micromechanisms and rigid body mechanisms. The attractive features of compliant micromechanisms include joint-less, single-piece construction that is amenable for easy fabrication, and minimal detrimental effects due to friction, wear and backlash. The deformation capability of compliant micromechanisms is attributed to the topology, shape and size of their structure. In this research, we formulate a systematic method to the design of such mechanisms using the structural optimization approach. An emerging topology optimization technique, called homogenization method, is used to solve the synthesis problem with least dependence on designer's intervention. The proposed method is thus a valuable synthesis tool for automating the design of optimal micromechanical devices. The concept of compliant mechanisms and the proposed design methodology are both illustrated with a microcompliant crimping mechanism that has been fabricated and tested.