Sonic boom post processing to include atmospheric turbulence effects

Lance L. Locey, Victor W. Sparrow, Andrew A. Piacsek

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

The Nonlinear Progressive wave Equation (NPE) is modified to include a turbulence representation based upon temperature fluctuations. The turbulence is composed of the sum of 600 Fourier modes based on a modified von Kármán spectrum with an outer length scale of 100 m and an inner length scale of .001 m. Variations in temperature induce variations in the local speed of sound. The NPE propagates for several seconds with a propagation time step of 1e-5 s. The resultant 2D waveform is then used to generate filter functions which approximate the effects of propagation through the turbulence. The filter functions can then be used to represent turbulent propagation by convolving the filter with any waveform, assuming it has sufficient high frequency content.

Original languageEnglish (US)
Title of host publication14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)
StatePublished - Dec 1 2008
Event14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference) - Vancouver, BC, Canada
Duration: May 5 2008May 7 2008

Publication series

Name14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)

Other

Other14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)
CountryCanada
CityVancouver, BC
Period5/5/085/7/08

Fingerprint

Atmospheric turbulence
Turbulence
Wave equations
Processing
Acoustic wave velocity
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Locey, L. L., Sparrow, V. W., & Piacsek, A. A. (2008). Sonic boom post processing to include atmospheric turbulence effects. In 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference) [2008-3035] (14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)).
Locey, Lance L. ; Sparrow, Victor W. ; Piacsek, Andrew A. / Sonic boom post processing to include atmospheric turbulence effects. 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). 2008. (14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)).
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title = "Sonic boom post processing to include atmospheric turbulence effects",
abstract = "The Nonlinear Progressive wave Equation (NPE) is modified to include a turbulence representation based upon temperature fluctuations. The turbulence is composed of the sum of 600 Fourier modes based on a modified von K{\'a}rm{\'a}n spectrum with an outer length scale of 100 m and an inner length scale of .001 m. Variations in temperature induce variations in the local speed of sound. The NPE propagates for several seconds with a propagation time step of 1e-5 s. The resultant 2D waveform is then used to generate filter functions which approximate the effects of propagation through the turbulence. The filter functions can then be used to represent turbulent propagation by convolving the filter with any waveform, assuming it has sufficient high frequency content.",
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month = "12",
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Locey, LL, Sparrow, VW & Piacsek, AA 2008, Sonic boom post processing to include atmospheric turbulence effects. in 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)., 2008-3035, 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, BC, Canada, 5/5/08.

Sonic boom post processing to include atmospheric turbulence effects. / Locey, Lance L.; Sparrow, Victor W.; Piacsek, Andrew A.

14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). 2008. 2008-3035 (14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - The Nonlinear Progressive wave Equation (NPE) is modified to include a turbulence representation based upon temperature fluctuations. The turbulence is composed of the sum of 600 Fourier modes based on a modified von Kármán spectrum with an outer length scale of 100 m and an inner length scale of .001 m. Variations in temperature induce variations in the local speed of sound. The NPE propagates for several seconds with a propagation time step of 1e-5 s. The resultant 2D waveform is then used to generate filter functions which approximate the effects of propagation through the turbulence. The filter functions can then be used to represent turbulent propagation by convolving the filter with any waveform, assuming it has sufficient high frequency content.

AB - The Nonlinear Progressive wave Equation (NPE) is modified to include a turbulence representation based upon temperature fluctuations. The turbulence is composed of the sum of 600 Fourier modes based on a modified von Kármán spectrum with an outer length scale of 100 m and an inner length scale of .001 m. Variations in temperature induce variations in the local speed of sound. The NPE propagates for several seconds with a propagation time step of 1e-5 s. The resultant 2D waveform is then used to generate filter functions which approximate the effects of propagation through the turbulence. The filter functions can then be used to represent turbulent propagation by convolving the filter with any waveform, assuming it has sufficient high frequency content.

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Locey LL, Sparrow VW, Piacsek AA. Sonic boom post processing to include atmospheric turbulence effects. In 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). 2008. 2008-3035. (14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference)).