Exterior noise was measured on the fuselage of a twin-engine, light aircraft at four values of engine rpm in ground static tests and at forward speeds up to 36 m/s in taxi tests. Propeller noise levels, spectra, and correlations were determined using a horizontal array of seven flush-mounted microphones and a vertical array of four flush-mounted microphones in the propeller plane. The measured levels and spectra are compared with predictions based on empirical and analytical methods for static and taxi conditions. Trace wavelengths of the propeller noise field, obtained from point-to-point correlations, are compared with the aircraft sidewall structural dimensions, and some analytical results are presented that suggest the sensitivity of interior noise transmission to variations of the propeller noise characteristics.
Characteristics of propeller noise on an aircraft fuselage related to interior noise transmission
American Institute of Aeronautics and Astronautics, Aeroacoustics Conference ; 1979 ; Seattle, WA
1979-03-01
Conference paper
No indication
English
Propeller aircraft interior noise model
NTRS | 1984
|Propeller Aircraft Interior Noise Model
NTIS | 1984
|