NDLI: A Pseudo-Rigid-Body Model Approach for the Design of Compliant Mechanism Springs for Prescribed Force-Deflections

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Levi, C. Leishman Mark, B. Colton
Copyright Year	2011
Abstract	Compliant mechanism springs offer a variety of benefits for applications where nonlinear force responses are desired. Designing a compliant mechanism spring with a prescribed force response is a unique challenge with many design variables. This paper introduces a method, based on the Pseudo-Rigid-Body Model (PRBM) for large beam deflections, to synthesize three- and four-link compliant mechanisms that exhibit prescribed force-deflection responses. The designer prescribes the target force-deflection curve, the number of links the spring is to have, and bounds for the spring’s link lengths and torsional spring constants. The method uses a genetic algorithm routine to search for promising designs and a direct search method to further refine the configuration to achieve the desired force-deflection curve. Experimental results illustrate the methods ability to generate springs whose force-deflection curves approximate the target curves. The results also suggest that inclusion of more complex configurations may lead to more accurate designs. It is shown how the method can be used to design springs that closely mimic the behavior of zero-free-length springs, and a discussion of how the method can be extended to design springs that behave similarly to pre-tensioned springs is presented.
Sponsorship	Design Engineering Division and Computers and Information in Engineering Division
Starting Page	93
Ending Page	102
Page Count	10
File Format	PDF
ISBN	9780791854839
DOI	10.1115/DETC2011-47590
Volume Number	Volume 6: 35th Mechanisms and Robotics Conference, Parts A and B
Conference Proceedings	ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Language	English
Publisher Date	2011-08-28
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Design Elastic constants Compliant mechanisms Deflection Springs Genetic algorithms
Content Type	Text
Resource Type	Article

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