NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsLateral Cutoff Analysis and Results from NASA's Farfield Investigation of No-Boom ThresholdsIn support of the ongoing effort by the National Aeronautics and Space Administration (NASA) to bring supersonic commercial travel to the public, the NASA Armstrong Flight Research Center (AFRC) and the NASA Langley Research Center (LaRC), in partnership with other industry organizations and academia, conducted a flight research experiment to analyze acoustic propagation at the lateral edge of the sonic boom carpet. The name of the effort was the Farfield Investigation of No-boom Thresholds (FaINT). The test helped to build a dataset that will go toward further understanding of the unique acoustic propagation characteristics near the sonic boom carpet extremity. The FaINT was an effort that collected finely-space sonic boom data across the entire lateral cutoff transition region. A major objective of the effort was to investigate the acoustic phenomena that occur at the audible edge of a sonic boom carpet, including the transition and shadow zones. A NASA F-18B aircraft made supersonic passes such that its sonic boom carpet transition zone would intersect a linear 60-microphone, 7500-ft long array. A TG-14 motor glider equipped with a microphone on its wing also attempted to capture the same sonic boom rays that were measured on the ground, at altitudes of 3000 - 6000 ft above ground level. This paper determined an appropriate metric for sonic boom waveforms in the transition and shadow zones called Perceived Sound Exposure Level, and established a value of 65 dB as a limit for the acoustic levels defining the lateral extent of a sonic boom's noise region; analyzed the change in sonic boom levels as a function of distance from flight path both on the ground and 4500 ft above the ground; and compared between sonic boom measurements and numerical predictions.Document ID20160003115Acquisition SourceArmstrong Flight Research CenterDocument TypeTechnical Memorandum (TM)AuthorsCliatt, Larry J., II*(NASA Armstrong Flight Research Center Edwards, CA, United States)*Haering, Edward A., Jr.*(NASA Armstrong Flight Research Center Edwards, CA, United States)*Arnac, Sarah R.*(NASA Armstrong Flight Research Center Edwards, CA, United States)*Hill, Michael A.*(NASA Armstrong Flight Research Center Edwards, CA, United States)*Date AcquiredMarch 8, 2016Publication DateFebruary 1, 2016Subject CategoryAcousticsReport/Patent NumberNASA/TM-2016-218850DFRC-E-DAA-TN25061Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Keywordsacousticssonic boomsflight researchAvailable DownloadsNameType20160003115.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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