Conceptual Design of an Edgewise Mission Adaptive Rotor

摘要

As part of the Defense Advanced Research Projects Agency (DARPA) sponsored Mission Adaptive Rotor (MAR)rnPhase I program, Boeing developed conceptual designs of demonstration and objective edgewise MissionrnAdaptive Rotor (eMAR) systems that help meet DARPA goals for improved payload, range, noise and vibrations.rnBoeing has chosen the state-of-the art Apache CMRB (Composite Main Rotor Blade) rotor for the demonstrationrnrotor and a scaled up version of the CMRB rotor together with a new-design low drag airframe for the objectivernrotorcraft. Preliminary conceptual designs of nine, blade installed adaptive devices were developed. Thesernincluded four trailing edge flap, two leading edge droop, extended chord, Gurney flap, blade twist concepts.rnComputational Fluid Dynamics (CFD) and comprehensive analyses were used to guide the effort and evaluate thernhover, forward flight, acoustic, and vibration benefits of the on-blade devices, active pitch links, and variable rotorrnspeed. Trade studies and evaluation of the adaptive concepts, and blade integration and system integration studiesrnwere performed. Together with consideration of the aeromechanical benefits, they provided the basis for therndownselect of adaptive concepts that were then used in the adaptive rotor conceptual design. Mission performancernanalysis was performed to evaluate the payload and range benefits. For both the demonstration and objective rotorrnconfigurations adaptation provides significant improvements in capability.