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Abstract
^anson, D. B., Helicoidal Surface Theory for Propeller Aerodynamics and AIAA Journal, Vol. 21, June 1983, pp. 881-889. Long, L. N., ''The Compressible Aerodynamics of Rotating Blades Using an Acoustic Formulation, Ph.D. Dissertation, School of Engineering and Applied Science, George Washington University, Washington, D.C., April 1983. Long, L. N., Aerodynamics of Propellers and Rotors Using an Acoustic Formulation in the Time Domain, AIAA Paper 831821, 1983. Farassat, F., Prediction of the Noise of Supersonic Propellers in Time Domain—New Theoretical Results, AIAA Paper 83-0743, April 1983. Ffowcs Williams, J. E. and Hawkings, D. L., Generated by Turbulence and Surfaces in Arbitrary Motion, Philosophical Transactions of the Royal Society of London, Vol. A264, 1969, pp. 321-342. Isom, M. P., Theory of Sound Radiated by a Hovering Transonic Helicopter Blade, Polytechnic Institute of New York, Rept. Poly-AE/AM 75-4, 1975. Farassat, F., Advanced Theoretical Treatment of Propeller Propeller Performance and Noise, von Karmn Institute for Fluid Dynamics, Lecture Series 1982-08, 1982. function, and tf the duration of the pulse within a period. The periodic pulse excitation F( t) is shown in Fig. 1. Assuming that steady-state conditions are obtained after sufficiently large n = N, the system response will satisfy the following conditions:
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