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Research Papers

Multiphysics Modeling and Design of Shape Memory Alloy Wave Springs as Linear Actuators

[+] Author and Article Information
Andrea Spaggiari

Eugenio Dragoni

Department of Engineering Sciences and Methods,  University of Modena and Reggio Emilia, 42122 Reggio Emilia, Italyeugenio.dragoni@unimore.it

J. Mech. Des 133(6), 061008 (Jun 16, 2011) (8 pages) doi:10.1115/1.4004196 History: Received October 07, 2010; Accepted May 02, 2011; Published June 16, 2011; Online June 16, 2011

This paper explores the merits of shape memory wave springs as powering elements of solid-state actuators. Advantages and disadvantages of the wave construction in comparison to the traditional helical shape are presented and discussed by means of dimensionless functions. The main assets of the wave springs are the higher electrical resistance (leading to simpler electrical drives) and the lower cooling time (leading to enhanced working frequency). The wave geometry is also superior in purely mechanical terms to the helical counterpart when axial space is at a premium. A step-by-step design procedure is proposed, leading to the optimal wave spring meeting the multiphysics design specifications and constraints. A case study is finally reported, showing the application of shape memory wave springs to the design of a telescopic linear actuator.

FIGURES IN THIS ARTICLE
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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Waves , Springs , Design
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Figures

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Figure 1

Examples of multiturn, crest-to-crest ® wave springs [8]: with end shims (a) and without end shims (b)

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Figure 2

Schematic drawing of the wave spring showing primary design variables

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Figure 3

Dependence of dimensionless geometrical properties Z/n and d/t on the number of waves N

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Figure 4

Dependence of normalized spring wave properties on the number of waves, N

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Figure 5

Scheme of the telescopic actuator powered by SMA wave springs in closed (a) and extended position (b)

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