Abstract
Induced velocity fields around a rotor which is subjected to uniform velocity with arbitrary attitude angles are estimated using measured blade flapping motion and system identification technique. The blade flapping motions are detected by blade mounted accelerometers and potentiometer so that blade flexibility effects on its aero-mechanical behavior could be captured. The measured data reconstructed by the sensor equation are fed into the kinematic observer for flapping rate estimation and then parameters which describe induced velocity distribution are identified by the recursive least-square method. Induced velocity distributions for a tilting rotor are modeled by interpolating these identified parameters. Comparisons between calculated and measured blade flapping responses for a tilting rotor are made. It is understood that identification processes are quite smooth and usefulness of the proposed identification procedure are ascertained.
