Interior noise considerations for advanced high-speed turboprop aircraftThis paper describes recent research on noise generated by high-speed propellers, on noise transmission through acoustically treated aircraft sidewalls and on subjective response to simulated turboprop noise. Propeller noise discussion focuses on theoretical prediction methods for complex blade shapes designed for low noise at Mach = 0.8 flight and on comparisons with experimental test results. Noise transmission experiments using a 168 cm. diameter aircraft fuselage model and scaled heavy-double-wall treatments indicate that the treatments perform well and that the predictions are usually conservative. Studies of subjective comfort response in an anechoic environment are described for noise signatures having combinations of broadband and propeller-type tone components.
Document ID
19820051483
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mixson, J. S. (NASA Langley Research Center Hampton, VA, United States)
Farassat, F. (NASA Langley Research Center Hampton, VA, United States)
Leatherwood, J. D. (NASA Langley Research Center Hampton, VA, United States)
Prydz, R. (NASA Langley Research Center Hampton, VA, United States)
Revell, J. D. (Lockheed-California Co. Burbank, CA, United States)