NASA NTRS · 19720009069
The NASA quiet engine program
Abstract
Initial studies on the design and testing of the quiet engine are described. The principal noise sources considered in the engine selection were the fan machinery noise and the fan and core jet noise. Nacelle acoustic linings are also mentioned. Fan and engine tests are discussed briefly and results indicate that it is possible to achieve or exceed noise reduction objectives of 15 to 20 PNdb below the levels of 707/DC-8 long-range transport aircraft.
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Kramer, J. J., Montegani, F. J.. 1972-01-01. The NASA quiet engine program. https://ntrs.nasa.gov/citations/19720009069
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