Abstract
Rotating blade noise is a topic of wide concern because it is the source of a variety of noise problems. These concerns range from safety, on the one hand, to community acceptability on the other. The purpose of this paper is to provide a general technical background for the problems of noise due to rotating blades. The topics to be covered are the following: the vehicles and components for which these problems are pertinent, the nature of the noise produced, the sources of the noise, concepts of noise generation, identification of the significant parameters in noise generation and reduction, and the methods of noise prediction. Both free rotors and ducted rotors are considered. In addition to the references cited in the text, this paper presents a bibliography of some of the more recent work (since 1968) in the areas of rotor and propeller noise, compressor and fan noise, and duct acoustics.
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