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- W2086485032 abstract "A continuous source motion model has been developed to represent a cruising aircraft traveling at high altitudes. The numerical implementation is based on the Lorentz transform (LT) and a Fast Field Program (FFP) formulation, which is used to compute the sound fields due to a monopole point source traversing in a horizontally stratified atmosphere parallel to a ground surface. To reduce the computational expenses, a one-dimensional LT-FFP is performed to obtain the pressure time-history for overhead flight conditions. The continuous source motion model is compared against a heuristic model which applies a Doppler shift to the stationary source sound field. A linear sound speed profile was selected to simplify the ray model implementation. A parametric study involving the source Mach number and source emission frequency has been performed in a variety of environmental conditions. The differences in the predicted maximum sound pressure levels between the two models can be as large as 9 dB under certain conditions. Numerical simulations indicate that low source emission frequencies (e.g., 50–300 Hz) combined with high source Mach numbers tend to result in larger discrepancies. The numerical simulations suggest the importance of including the effects of convective source amplification, especially, for turboprop aircraft noise propagation." @default.
- W2086485032 created "2016-06-24" @default.
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- W2086485032 date "2013-11-01" @default.
- W2086485032 modified "2023-09-24" @default.
- W2086485032 title "Source motion modeling for high-speed aircraft noise propagation" @default.
- W2086485032 doi "https://doi.org/10.1121/1.4831246" @default.
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