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- W2052651778 abstract "Abstract A technique of predicting the A-weighted time history of flyover noise making use of directivity patterns is presented. These directivity patterns of aircraft noise radiation are based upon simultaneous recording of the acoustical and geometrical data. The acoustical measurements are performed at various ground positions and synchronized with tracking radar information. In the data processing, the effects of spherical spreading, atmospheric absorption and the delay time between source and receiver are taken into account. The result is a simple analytical description of the directivity pattern of aircraft in flight, in the form of a group of coefficients assigned to each aircraft type. The coefficients are obtained by curve fitting, based on the acoustical and geometrical data. They are applied in a set of polynomials, yielding valid results over a wide range of distances and emission angles. The A-weighted sound level for subsonic aircraft in flight can thus be predicted accurately. Furthermore, the time history of the flyover noise can be simulated for any observer point relative to the flight path." @default.
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- W2052651778 date "1988-01-01" @default.
- W2052651778 modified "2023-09-23" @default.
- W2052651778 title "Prediction of A-weighted aircraft noise based on measured directivity patterns" @default.
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- W2052651778 doi "https://doi.org/10.1016/0003-682x(88)90079-5" @default.
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