Ground and air resonance of bearingless rotors in hoverA finite element formulation is used to investigate ground and air resistence in hover for a bearingless rotor. Aerodynamic forces are studied using quasi-steady strip theory, and unsteady aerodynamic effects are introduced through an inflow dynamics model. Reasonable correlation was found between predicted ground and air resonance results and data obtained from measurements using a 1/8th Froude-scaled dynamic model. Systematic parametric studies of the effects of various design parameters were performed, and lag frequency was found to significantly influence ground resonance stability, whereas pitch-lag coupling, blade sweep and pitch link stiffness had powerful effects on air resonance stability.
Document ID
19870046485
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jang, Jinseok (Maryland Univ. College Park, MD, United States)
Chopra, Inderjit (Maryland, University College Park, United States)