Long-range and nonlinear propagation of helicopter high-speed impulsive noise

Research output: Contribution to journalConference article

Abstract

A Burgers equation model is applied to predict nonlinear propagation of helicopter high-speed impulsive noise. The Burgers equation model is validated against an analytic solution for a sinusoidal wave and then applied to a model-scale rotor noise. The Euler CFD data is used to extract the starting signal and to validate the prediction obtained by the Burgers equation. It is found that the prediction agrees very well with the CFD data. The sensitivity of the starting position in the proximity of the blade tip to the prediction is investigated. In addition, a difference between linear and nonlinear propagations is shown for long distances. The effect of the atmospheric absorption in comparison with the nonlinear propagations is also examined. Finally, the nonlinearity indicator is used to identify the energy transfer in the frequency domain and to explain the SPL distribution.

Original languageEnglish (US)
Pages (from-to)2704-2714
Number of pages11
JournalAnnual Forum Proceedings - AHS International
Volume4
StatePublished - Nov 15 2010
Event66th Forum of the American Helicopter Society: "Rising to New Heights in Vertical Lift Technology", AHS Forum 66 - Phoenix, AZ, United States
Duration: May 11 2010May 13 2010

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Impulse noise
Helicopters
Computational fluid dynamics
Energy transfer
Rotors

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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title = "Long-range and nonlinear propagation of helicopter high-speed impulsive noise",
abstract = "A Burgers equation model is applied to predict nonlinear propagation of helicopter high-speed impulsive noise. The Burgers equation model is validated against an analytic solution for a sinusoidal wave and then applied to a model-scale rotor noise. The Euler CFD data is used to extract the starting signal and to validate the prediction obtained by the Burgers equation. It is found that the prediction agrees very well with the CFD data. The sensitivity of the starting position in the proximity of the blade tip to the prediction is investigated. In addition, a difference between linear and nonlinear propagations is shown for long distances. The effect of the atmospheric absorption in comparison with the nonlinear propagations is also examined. Finally, the nonlinearity indicator is used to identify the energy transfer in the frequency domain and to explain the SPL distribution.",
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Long-range and nonlinear propagation of helicopter high-speed impulsive noise. / Lee, Seongkyu; Brentner, Kenneth Steven; Morris, Philip John.

In: Annual Forum Proceedings - AHS International, Vol. 4, 15.11.2010, p. 2704-2714.

Research output: Contribution to journalConference article

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T1 - Long-range and nonlinear propagation of helicopter high-speed impulsive noise

AU - Lee, Seongkyu

AU - Brentner, Kenneth Steven

AU - Morris, Philip John

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N2 - A Burgers equation model is applied to predict nonlinear propagation of helicopter high-speed impulsive noise. The Burgers equation model is validated against an analytic solution for a sinusoidal wave and then applied to a model-scale rotor noise. The Euler CFD data is used to extract the starting signal and to validate the prediction obtained by the Burgers equation. It is found that the prediction agrees very well with the CFD data. The sensitivity of the starting position in the proximity of the blade tip to the prediction is investigated. In addition, a difference between linear and nonlinear propagations is shown for long distances. The effect of the atmospheric absorption in comparison with the nonlinear propagations is also examined. Finally, the nonlinearity indicator is used to identify the energy transfer in the frequency domain and to explain the SPL distribution.

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