27 July 1998 Shape memory alloy actuators for in-flight tracking of helicopter rotor blades
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Abstract
This paper examines, analytically and experimentally, a shape memory alloy (SMA) wire actuator to be used for in- flight tracking of helicopter rotor blades. The recovery characteristics of SMA's are utilized to detect a trailing edge trim tab. Conceptually, the tab is deflected using SMA wires with initial pre-strains, and any differential recovery displacement due to a thermal field is transformed into an angular motion of the tab. A 1D thermo-mechanical constitutive model is used to predict the constrained recovery characteristics of SMA's and predicted results are validated with measured values. Good correlation between measured and predicted values is obtained.
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Jeanette J. Epps, Jeanette J. Epps, Inderjit Chopra, Inderjit Chopra, } "Shape memory alloy actuators for in-flight tracking of helicopter rotor blades", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); doi: 10.1117/12.316904; https://doi.org/10.1117/12.316904
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