Design of compliant mechanisms for practical applications using selection maps

Hegde, S and Ananthasuresh, GK (2020) Design of compliant mechanisms for practical applications using selection maps. In: 14th National Conference on Machines and Mechanisms, NaCoMM 2009, 17-18 December 2009, National Institute of Technology Durgapur; India, pp. 27-36.

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Abstract

We present an interactive map-based technique for designing compliant mechanisms that meet the requirements of a practical application. Our map juxtaposes user-specifications with the attributes of real compliant mechanisms stored in a database so that not only the practical feasibility of specifications can be discerned quickly but also modifications can be done intuitively to the existing compliant mechanisms. The upper and lower bounds on the specification variables entered by a user are used to show a part of the feasible region on a 2D map. The basis to draw the feasible region is the spring-leverage (SL) model, which is used to characterize the kinematic and elastic behavior of single-input-single-output compliant mechanisms for the purpose of static analysis. The SL model consists of three constants: (i) the input spring stiffness, (ii) the output spring stiffness, and (iii) the inherent geometric amplification factor. The three constants are computed a priori for the compliant mechanisms in the database by using the finite element analysis of their beam-based 2D meshed models. This enables us to show compliant mechanisms on the map. If any of them lie within the feasible region and has the appropriate geometric amplification factor, a solution is readily found. If not, a solution is found by modifying the mechanism. The meshed models can be interactively modified to change their attributes such as: (i) overall size in x and y directions, separately and together, (ii) uniform re-sizing of the in-plane widths of all the beam elements, (iii) uniform resizing of the out-of-plane thicknesses of the beam elements, and (iv) material. A case study that describes the design procedure in detail is also presented while additional case studies are posted on the web-site: www.mecheng.iisc.ernet.in/~hegde/paper. © 2009 14th National Conference on Machines and Mechanisms, NaCoMM 2009. All rights reserved.

Item Type:	Conference Paper
Publication:	14th National Conference on Machines and Mechanisms, NaCoMM 2009
Publisher:	NaCoMM 2009
Additional Information:	The copyright of the article belongs to NaCoMM 2009.
Keywords:	Design; Mechanisms; Specifications; Springs (components); Stiffness, Amplification factors; Design procedure; Elastic behavior; Feasible regions; Interactive maps; Single input single output; Spring stiffness; Upper and lower bounds, Compliant mechanisms
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	19 Nov 2020 06:24
Last Modified:	09 Dec 2022 05:12
URI:	https://eprints.iisc.ac.in/id/eprint/66059

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