Abstract
The increasing use of general aviation aircraft as a major mode of transportation has stimulated interest in interior cabin noise. A program to study this problem has been developed at North Carolina State University. The initial phase of the program entails an experimental investigation of the noise environment of a typical propeller driven, light aircraft powered by a reciprocating engine. Preliminary testing revealed the propeller and engine exhaust to be the dominant noise sources. The major paths by which airborne sound enters the cabin were found to be the windows and the window and door seals. These preliminary studies were used to determine problem areas for further investigation. Further experimentation explored the relative importance of sound transmission through windows, increased sound radiation due to window resonances, and flanking around window and door seals. The investigation concluded that further studies should be devoted to the parameters governing sound transmission through the windows. [This project supported by the NASA Langley Research Center.]
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