Experimental/numerical acoustic correlation of helicopter unsteady manoeuvres

Abstract

One of the main factors that limit public acceptance of rotorcraft is the noise emitted over densely populated areas, which prevents a wider diffusion of these vehicles capable of performing flight operations otherwise unattainable. It is the result of complex phenomena generated aerodynamically, through the main and tail rotors, as well as mechanically, by the engine and transmission system. Significant research effort is currently made for reducing rotorcraft acoustic impact, both by helicopter manufacturers and by research institutes and academia.