Influence of unsteady aerodynamics on rotor blade aeroelastic stability and response
The paper describes the incorporation of finite-state, time-domain aerodynamics in a flap-lag-torsional aeroelastic stability and response analysis in forward flight. Improvements to a previous formulation which eliminate spurious singularities are introduced. The methodology for solving the aeroelastic stability and response problems with augmented states, in the time domain, is presented using an implicit formulation. Results illustrating the aeroelastic behaviour of soft and stiff in-plane hingeless rotor blades in forward flight are presented to show the sensitivity of both the stability and response problems to time-domain unsteady aerodynamics.