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Freeform Skeletal Shape Optimization of Compliant Mechanisms

Xu, Dong and Ananthasuresh, GK (2003) Freeform Skeletal Shape Optimization of Compliant Mechanisms. In: jounal of Mechanical Design, 125 (2). pp. 253-261.

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Official URL: http://dx.doi.org/10.1115/1.1563634#

Abstract

Compliant mechanisms are elastic continua used to transmit or transform force and motion mechanically. The topology optimization methods developed for compliant mechanisms also give the shape for a chosen parameterization of the design domain with a fixed mesh. However, in these methods, the shapes of the flexible segments in the resulting optimal solutions are restricted either by the type or the resolution of the design parameterization. This limitation is overcome in this paper by focusing on optimizing the skeletal shape of the compliant segments in a given topology. It is accomplished by identifying such segments in the topology and representing them using Bezier curves. The vertices of the Bezier control polygon are used to parameterize the shape-design space. Uniform parameter steps of the Bezier curves naturally enable adaptive finite element discretization of the segments as their shapes change. Practical constraints such as avoiding intersections with other segments, self-intersections, and restrictions on the available space and material, are incorporated into the formulation. A multi-criteria function from our prior work is used as the objective. Analytical sensitivity analysis for the objective and constraints is presented and is used in the numerical optimization. Examples are included to illustrate the shape optimization method.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ASME
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Mr NAGARJUNA PITTY
Date Deposited: 30 Jun 2014 09:43
Last Modified: 30 Jun 2014 09:43
URI: http://eprints.iisc.ac.in/id/eprint/49392

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