The paper presents a modular architecture for SMA actuators elastically compensated by thin beams loaded axially beyond their buckling limit. Starting from the exact equations for the elastic curve of the beams, an approximate procedure is developed for the engineering design of the entire compensating system. The theory of the compensator is validated successfully against a finite element model and experimental results. The experimental characterization of a complete prototype actuator shows that the forces generated by the compensated actuator are constant for both instroke and outstroke over the full range of displacements. The actuator concept proposed lends itself to modular assembly to multiply either the stroke covered (series combination) or the force generated (parallel combination). Copyright © 2012 by ASME.
Elastic compensation of linear shape memory alloy actuators using compliant mechanisms / Mammano, G. S.; Dragoni, E.. - 1:(2012), pp. 237-246. (Intervento presentato al convegno ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012 tenutosi a Stone Mountain, GA, usa nel SEP 19-21, 2012) [10.1115/SMASIS2012-7906].
Elastic compensation of linear shape memory alloy actuators using compliant mechanisms
Dragoni E.
2012
Abstract
The paper presents a modular architecture for SMA actuators elastically compensated by thin beams loaded axially beyond their buckling limit. Starting from the exact equations for the elastic curve of the beams, an approximate procedure is developed for the engineering design of the entire compensating system. The theory of the compensator is validated successfully against a finite element model and experimental results. The experimental characterization of a complete prototype actuator shows that the forces generated by the compensated actuator are constant for both instroke and outstroke over the full range of displacements. The actuator concept proposed lends itself to modular assembly to multiply either the stroke covered (series combination) or the force generated (parallel combination). Copyright © 2012 by ASME.
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