NDLI: Analytical Modelling of Rolamite Mechanism Made of Shape Memory Alloy for Constant Force Actuators

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Spaggiari, Andrea Dragoni, Eugenio
Copyright Year	2015
Abstract	This paper analyses the Rolamite architecture exploiting shape memory alloys as power element to obtain a solid state actuator. The Rolamite mechanism was discovered in the late sixties, initially as precision and low friction linear bearing. The most common Rolamite configuration consists of a flexible thin metal strip and two rollers mounted between two fixed parallel guide surfaces. The system can roll back and forth without slipping guided by the plates along its so called sensing axis. The system presents another relevant advantage in addition to low friction coefficient, which is the possibility to provide force generation in a quite simple way. In the original literature works the force was provided thanks to cutouts of various shape in the strip, though this method does not allow the Rolamite to be considered a proper actuator, but only a force generator. In this paper we developed the idea of exploiting the shape memory alloy as Rolamite power element and therefore to use the shape memory effect to change the elastic properties of the strip and to provide the actuation force. The mechanical analyses and the equations where the martensite-austenite transition is modelled in a simplified way, show that this application is feasible, mainly thanks to the initial precurvature of the SMA strip. The discussion of the results highlights some important merits of this architecture such as long stroke, constant force and compactness.
Sponsorship	Aerospace Division
File Format	PDF
ISBN	9780791857298
DOI	10.1115/SMASIS2015-8803
Volume Number	Volume 1: Development and Characterization of Multifunctional Materials; Mechanics and Behavior of Active Materials; Modeling, Simulation and Control of Adaptive Systems
Conference Proceedings	ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
Language	English
Publisher Date	2015-09-21
Publisher Place	Colorado Springs, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Actuators Strips Shape memory alloys Rollers Bearings Elasticity Generators Modeling Shape memory effects Friction Plates (structures) Strip metal Shapes
Content Type	Text
Resource Type	Article

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