Preliminary Investigation of Multilobe Fighter Jet Noise Sources Using Acoustical Holography

نویسندگان

  • Alan T. Wall
  • Kevin M. Leete
  • Kent L. Gee
  • Tracianne B. Neilsen
  • Michael M. James
  • Richard L. McKinley
چکیده

An understanding of jet noise source mechanisms can facilitate targeted noise reduction efforts. This understanding has been enhanced with acoustic imaging technologies, such as near-field acoustical holography (NAH). In this study, multisource statistically optimized NAH (M-SONAH) was used to image the sound field near a tethered F-35 aircraft at multiple frequencies. A linear microphone array, placed along the ground, spanned the length of the jet exhaust plume. A multisource model of the sound field was included in the algorithm to incorporate the effects of the ground reflection on the measurement. Narrowband reconstructions elucidated fine details of the radiation patterns, such as multilobe radiation patterns (which may supersede “dual-lobe” patterns shown in previous studies), and broadband shock-associated noise. [Work supported by F-35 JPO.]

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تاریخ انتشار 2017