Hingeless-rotor aeromechanical stability in axial and forward flight with wake dynamics

摘要

A finite-state wake model is used to investigate aeromechanical stability of hingeless-rotor helicopters in the ground-contact, hover and trimmed-flight conditions. The investigation covers three items:(1)the convergence of the damping with increasing number of wake harmonics for the lag regressing, and body pitch and roll modes;(2)a parametric study of the damping over a range of thrust level, advance ratio and number of blades; and(3)correlations, primarily with the damping and frequency measurements of these lag and body modes.