Nonlinear propagation of aircraft noise in the atmosphere
Abstract
Anomalies of several dB in the propagation of aircraft noise have been traced to nonlinear propagation effects. Specifically, over distances of order 500-1000 m the high-frequency components of the noise spectrum exhibit substantially less attenuation than linear theory predicts, even when atmospheric nonuniformity and bandwidth corrections are allowed for. A statistical theory of noise propagation has been formulated, and the spectral transfer term estimated from analyses of noise recordings. For prediction purposes, a computer program has been developed which incorporates the nonlinear theory. Preliminary results show encouraging agreement with the anomalous data.
- Publication:
-
American Institute of Aeronautics and Astronautics Conference
- Pub Date:
- June 1980
- Bibcode:
- 1980aiaa.confV....M
- Keywords:
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- Aircraft Noise;
- Atmospheric Attenuation;
- Noise Prediction (Aircraft);
- Noise Propagation;
- Computer Programs;
- Noise Spectra;
- Nonlinearity;
- Acoustics