Formulation and validation of high-order linearized models of helicopter flight mechanicsA high-order linearized model of helicopter flight dynamics is extracted from a nonlinear time domain simulation. The model has 29 states that describe the fuselage rigid body degrees of freedom, the flap and lag dynamics in a nonrotating coordinate system, the inflow dynamics, the delayed entry of the horizontal tail into the main rotor wake, and, approximately, the blade torsion dynamics. The nonlinear simulation is obtained by extensively modifying the GENHEL computer program. The results indicate that the agreement between the linearized and the nonlinear model is good for small perturbations, and deteriorates for large amplitude maneuvers.
Document ID
19910032657
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kim, Frederick D. (Maryland Univ. College Park, MD, United States)
Celi, Roberto (Maryland, University College Park, United States)
Tischler, Mark B. (NASA Ames Research Center; U.S. Army, Aeroflightdynamics Directorate, Moffett Field CA, United States)