Parametric Analysis For Aeroelastic Tailoring Stability Of Tiltrotor Aircraft

As a new type of aircraft, tiltrotor aircraft has the advantages of combining with helicopter andpropeller plane. It can implement continuous flight conversion between helicopter mode and propellerplane mode through the pivoting of rotor. Tiltrotor aircraft appeared whirl flutter due to aeroelasticcoupling of elastic wing and rotor, when high speed forward flight in prop-plane.Basing on Hamilton’s principle, an aeroelastically dynamical analysis model of semi-spantiltrotor aircraft was developed by the multi-body method, which considering the complex couplingsrelationships between rotor and wing. In this paper, the model of tiltrotor aircraft was founded withrigid pylon, elastic blade and wing. The beams of elastic blades and wing with composite materialtailored design were applied in this analysis model. In which, the effect of coupling distortions wasretained between the tailored wing and blade.In this paper, the influence of the tailored design of composite material to the statics&dynamiccharacteristics for thin-walled composite box-beams was analyzed. Mastered the action mechanism oftailored composite and verified the effectiveness of the analysis model. The results demonstrated thatcomposite beam could get favorable bending-twist coupling deformation and be applied to wing andblade beam of tiltrotor aircraft, through the effective tailored design of composite material beam.Basing on the aeroelastically dynamic analysis model of semi-span tiltrotor aircraft, theinfluences of parameters on aeroelastic stability of tiltrotor aircraft associated with tailored designwing and blade were analyzed. The research on aeroelastic stability of forward flight tiltrotor aircraftwas compared between tailored design wing or blade and the base wing or blade. A comprehensiveanalysis was implemented, aiming to know the impact of dynamics design parameters of tiltrotoraircraft on stability of whirl flutter. By compared the analysis on the influence of forward flighttiltrotor aircraft stability, verified that the applied of the tailored technology could effectively improvethe boundary velocity of tiltrotor aircraft whirl flutter, delay the unstable phenomenon to appear. Inthe meantime, some significant conclusions had been obtained, which had an important role to guidethe dynamic design of tiltrotor aircraft.