Abstract
The theory is developed in terms of the velocity potential rather than the acceleration potential, and a brief outline is given of the simple numerical technique used. The effects of varying airfoil spacing, frequency, Mach number, stagger angle, and phase difference between adjacent airfoils are discussed. Particular attention is given to variations in the aerodynamic damping for pure vertical translational and pitching motions. It is shown that the translational damping can become zero at certain discrete frequencies but that it never becomes negative. The pitching moment damping, however, can become negative over a wide range of frequencies of practical interest. The airfoils are assumed to be at zero mean incidence.
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