6 April 2009 A bistable mechanism for chord extension morphing rotors
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Abstract
Research efforts have shown that helicopter rotor blade morphing is an effective means to improve flight performance. Previous example of rotor blade morphing include using smart-materials for trailing deflection and rotor blade twist and tip twist, the development of a comfortable airfoil using compliant mechanisms, the use of a Gurney flap for air-flow deflection and centrifugal force actuated device to increase the span of the blade. In this paper we explore the use of a bistable mechanism for rotor morphing, specifically, blade chord extension using a bistable arc. Increasing the chord of the rotor blade is expected to generate more lift-load and improve helicopter performance. Bistable or "snap through" mechanisms have multiple stable equilibrium states and are a novel way to achieve large actuation output stroke. Bistable mechanisms do not require energy input to maintain a stable equilibrium state as both states do not require locking. In this work, we introduce a methodology for the design of bistable arcs for chord morphing using the finite element analysis and pseudo-rigid body model, to study the effect of different arc types, applied loads and rigidity on arc performance.
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Terrence Johnson, Terrence Johnson, Mary Frecker, Mary Frecker, Farhan Gandhi, Farhan Gandhi, } "A bistable mechanism for chord extension morphing rotors", Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 72881C (6 April 2009); doi: 10.1117/12.815472; https://doi.org/10.1117/12.815472
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