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- W2319927373 abstract "A mode measurement array of 119 Kulite transducers was installed in an inlet duct section and tested with a Honeywell Tech977 turbofan engine. 2D mode analysis was performed using conventional beamforming and CLEAN-SC. The modes were determined in terms of sound power level. In-duct spatial source imaging was also performed using free space steering vectors and an annular duct Green’s function. CLEAN-SC is found to be a powerful enhancement for mode measurements, completely removing several types of array artifacts and facilitating reliable sound power estimates. An interesting feature of CLEANSC is that the resulting mode map potentially combines the powers of several modes into a single spot. Applying CLEAN-SC to the spatial imaging results in a confusing distribution of apparent point sources. A need to improve the way CLEAN-SC represents extended sources has been identified." @default.
- W2319927373 created "2016-06-24" @default.
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- W2319927373 date "2008-05-05" @default.
- W2319927373 modified "2023-09-27" @default.
- W2319927373 title "Nacelle In-Duct Beamforming Using Modal Steering Vectors" @default.
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- W2319927373 doi "https://doi.org/10.2514/6.2008-2812" @default.
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