Shape memory alloy active spars for blade twist

摘要

SHAPE MEMORY ALLOY ACTIVE SPARS FOR BLADE TWIST A system for changing a shape a structural spar (44) includes, in an exemplary embodiment, a plurality of adjoining structural strips (52) axially aligned to form the structural spar (44). At least one of the structural strips (54) is formed from a shape memory alloy. The system also includes a temperature control system (56) to control a temperature of the at least one shape memory alloy strip (54). Heat applied to the at least one shape memory alloy strip (54) causes the structural spar (44) to twist or bend. 7142905vl:PRW 0 Q) r-4 (%,j r-4 -c co. coL C3hJ co ac r-