The Response of a Model Helicopter Rotor Blade to Random Excitation During Forward Flight.
Final rept. 18 May 65-17 Aug 72,
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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The response of a model helicopter rotor blade to random excitation while in simulated forward flight is studied analytically and experimentally by means of an electromechanical apparatus. Complex transfer functions are defined which relate steady-state responses in bending, flapping, and torsion modes to a sine input. Responses occur at the input and side-band frequencies. These transfer functions are then used along with excitation power spectra to predict the nonstationary time-averaged power spectrum of the response. Validity of the transfer function analysis is investigated by means of the electromechanical model which includes analog computer simulation of the interaction of blade deflections and aerodynamic load. Author
- Fluid Mechanics