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- W4282574928 abstract "Microphone array measurements of the airframe noise from the High-Lift Common Research Model (CRM-HL) in the NASA Langley 14- by 22- Foot Subsonic Tunnel were initially hindered by extraneous noise sources. The steps taken to reduce the background noise in the open-jet test section for the aeroacoustic test are described in this paper. Adhesive-backed felt was used to attenuate noise resulting from the interaction of the test section shear layer with the collector and diffuser surfaces, scrubbing noise from the floor perforated panels, as well as an extraneous noise source produced near the junction of the model and the floor when the model was producing significant lift. The effects of the felt-on noise attenuation and acoustic reflections are discussed. Following the CRM-HL test, scrubbing noise measurements from a floor basket top were acquired in the Quiet Flow Facility to compare the performance of different perforated panel covers and their respective effects on the noise spectra. Aside from a smooth, hard wall, the felt cover was found to produce the minimum scrubbing noise of all the materials tested." @default.
- W4282574928 created "2022-06-14" @default.
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- W4282574928 date "2022-06-13" @default.
- W4282574928 modified "2023-09-27" @default.
- W4282574928 title "On the Alleviation of Background Noise for the High-Lift Common Research Model Aeroacoustic Test" @default.
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- W4282574928 doi "https://doi.org/10.2514/6.2022-2988" @default.
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