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).
- Aerospace Division
Elastic Compensation of Linear Shape Memory Alloy Actuators Using Compliant Mechanisms
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Mammano, GS, & Dragoni, E. "Elastic Compensation of Linear Shape Memory Alloy Actuators Using Compliant Mechanisms." Proceedings of the ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring. Stone Mountain, Georgia, USA. September 19–21, 2012. pp. 237-246. ASME. https://doi.org/10.1115/SMASIS2012-7906
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