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- W2087515770 abstract "The rotating microphone measurement technique and data analysis procedures are documented which are used to determine circumferential and radial acoustic mode content in the inlet of the Advanced Ducted Propeller (ADP) model. Circumferential acoustic mode levels were measured at a series of radial locations using the Doppler frequency shift produced by a rotating inlet microphone probe. Radial mode content was then computed using a least squares curve fit with the measured radial distribution for each circumferential mode. The rotating microphone technique is superior to fixed-probe techniques because it results in minimal interference with the acoustic modes generated by rotor-stator interaction. This effort represents the first experimental implementation of a measuring technique developed by T. G. Sofrin. Testing was performed in the NASA Lewis Low Speed Anechoic Wind Tunnel at a simulated takeoff condition of Mach 0.2. The design is included of the data analysis software and the performance of the rotating rake apparatus. The effect of experiment errors is also discussed." @default.
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- W2087515770 date "1993-01-11" @default.
- W2087515770 modified "2023-10-16" @default.
- W2087515770 title "Acoustic mode measurements in the inlet of a model turbofan using a continuously rotating rake - Data collection/analysis techniques" @default.
- W2087515770 cites W2039736405 @default.
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- W2087515770 doi "https://doi.org/10.2514/6.1993-599" @default.
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