This article 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 1960s, 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 cut-outs of various shapes in the strip, although this method does not allow the Rolamite to be considered a proper actuator, but only a force generator. In this article, 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 analysis, where the martensite–austenite transition is modelled in a simplified way, shows that this application is feasible, mainly thanks to the initial precurvature of the shape-memory alloy strip. The discussion of the results highlights some important merits of this architecture such as long stroke, constant force and compactness.
|Data di pubblicazione:||2017|
|Titolo:||ANALYTICAL MODELLING OF ROLAMITE MECHANISM MADE OF SHAPE MEMORY ALLOY FOR CONSTANT FORCE ACTUATORS|
|Autore/i:||Spaggiari, Andrea; Dragoni, Eugenio|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1177/1045389X16667560|
|Codice identificativo ISI:||WOS:000414133600005|
|Codice identificativo Scopus:||2-s2.0-85029693524|
|Citazione:||ANALYTICAL MODELLING OF ROLAMITE MECHANISM MADE OF SHAPE MEMORY ALLOY FOR CONSTANT FORCE ACTUATORS / Spaggiari, Andrea; Dragoni, Eugenio. - In: JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES. - ISSN 1045-389X. - 28:16(2017), pp. 2208-2221.|
|Tipologia||Articolo su rivista|
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