An analytic investigation was made to determine the dynamic properties of a two-bladed rigid fully gimballed helicopter rotor incorporating circulation control airfoils and tip jet propulsion. A time domain analysis was developed which provided the capability of using nonlinear airfoil aerodynamics and arbitrary rotor physical characteristics. The effects of feather principal axis of inertia location, horizontal gust disturbances, and feedback control on rotor stability were assessed. Results of the investigation indicate that the subject helicopter rotors are unstable in forward flight without feedback control. With feedback, the rotors are stable and controllable. (Author)
Time Domain Analysis of a Rigid Two-Bladed Fully Gimballed Helicopter Rotor with Circulation Control
1983
88 pages
Report
Keine Angabe
Englisch
Aerodynamics , Aircraft , Rotor blades(Rotary wings) , Helicopter rotors , Feedback , Gimbals , Aerodynamic stability , Time series analysis , Aerodynamic slots , Jet propulsion , Airfoils , Circulation , Control systems , Stabilization systems , Rigidity , Inertia , High lift , Gusts , Horizontal orientation , Hovering , Level flight , Equations of motion , Computerized simulation , Circulation control rotors , Gimballed rotors , Tip jet propulsion , Heavy lift helicopters , Blade tips , Time domain analysis , Horizontal gusts , Blowing slots , GIMSTAB computer program
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