Adaptive proprotors as applied to convertible MAVs

摘要: A passive twist control is considered as an adaptive way to maximize the overall efficiency of a proprotor developed for convertible Micro Air Vehicles (MAV). Incorporated into database airfoil characteristics, Blade Element Momentum Theory (BEMT) implemented predict performance proprotors at low Reynolds numbers. Using this model, it found that allows efficient hovering while high helps forward flight. The Centrifugal Force Induced Twist (CFIT) concept proposed realize required torsion between hover and Tip mass used provide nose-down twisting moment by centrifugal force stabilize flexible blade. Classical Lamination (CLT) employed estimate behavior glass/epoxy laminate blade study feasibility CFIT concept. results indicate predicted same level with deformation. blades were tested in flight modes, deformations measured Laser Displacement Sensor (LDS). In rotor mode, can generate approximately -9◦ tip rotating 1,300 RPM. By contrast, 800 RPM inflow velocity 8m/s, capable providing around -5◦ propeller mode.