Sensitivity of acoustic predictions to variation of input parameters

Kenneth Steven Brentner, Casey L. Burley, Michael A. Marcolini

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Rotor noise prediction codes predict the thickness and loading noise produced by a helicopter rotor, given the blade motion, rotor operating conditions, and fluctuating force distribution over the blade surface. However, the criticality of these various inputs, and their respective effects on the predicted acoustic field, have never been fully addressed. This paper examines the importance of these inputs, and the sensitivity of the acoustic predictions to a variation of each parameter. The effects of collective and cyclic pitch, as well as coning and cyclic flapping, are presented. Blade loading inputs are examined to determine the necessary spatial and temporal resolution, as well as the importance of the chordwise distribution. The acoustic predictions show regions in the acoustic field where significant errors occur when simplified blade motions or blade loadings are used. An assessment of the variation in the predicted acoustic field is balanced by a consideration of CPU time necessary for the various approximations.

Original languageEnglish (US)
Pages (from-to)43-52
Number of pages10
JournalJournal of the American Helicopter Society
Volume39
Issue number3
StatePublished - Jul 1994

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Acoustic fields
Acoustics
Rotors
Helicopter rotors
Acoustic noise
Turbomachine blades
Program processors

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

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title = "Sensitivity of acoustic predictions to variation of input parameters",
abstract = "Rotor noise prediction codes predict the thickness and loading noise produced by a helicopter rotor, given the blade motion, rotor operating conditions, and fluctuating force distribution over the blade surface. However, the criticality of these various inputs, and their respective effects on the predicted acoustic field, have never been fully addressed. This paper examines the importance of these inputs, and the sensitivity of the acoustic predictions to a variation of each parameter. The effects of collective and cyclic pitch, as well as coning and cyclic flapping, are presented. Blade loading inputs are examined to determine the necessary spatial and temporal resolution, as well as the importance of the chordwise distribution. The acoustic predictions show regions in the acoustic field where significant errors occur when simplified blade motions or blade loadings are used. An assessment of the variation in the predicted acoustic field is balanced by a consideration of CPU time necessary for the various approximations.",
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Sensitivity of acoustic predictions to variation of input parameters. / Brentner, Kenneth Steven; Burley, Casey L.; Marcolini, Michael A.

In: Journal of the American Helicopter Society, Vol. 39, No. 3, 07.1994, p. 43-52.

Research output: Contribution to journalArticle

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