Helicopter noise prediction: The current status and future direction

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The current status of helicopter noise prediction is examined in this paper. A brief history is given, followed by a discussion of the status of prediction for each source mechanism. The acoustic analogy approach, and specifically, theories based on the Ffowcs Williams-Hawkings equations are the most widely used for deterministic noise sources. Thickness and loading noise can be routinely predicted given good blade motion and blade loading inputs. Blade-vortex interaction (BVI) noise can also be predicted well with measured input data, but prediction of airloads with the high spatial and temporal resolution required for BVI is still difficult. No efficient prediction method for high speed impulsive noise is currently available, but much progress has been made. The best broadband noise prediction currently depends on semi-empirical methods.

Original languageEnglish (US)
Pages (from-to)79-96
Number of pages18
JournalJournal of Sound and Vibration
Volume170
Issue number1
DOIs
StatePublished - Feb 10 1994

Fingerprint

noise prediction
helicopters
Helicopters
blade-vortex interaction
blades
Ffowcs Williams-Hawkings equation
predictions
Vortex flow
temporal resolution
Impulse noise
spatial resolution
high speed
histories
broadband
Acoustics
acoustics
high resolution

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Helicopter noise prediction: The current status and future direction",
abstract = "The current status of helicopter noise prediction is examined in this paper. A brief history is given, followed by a discussion of the status of prediction for each source mechanism. The acoustic analogy approach, and specifically, theories based on the Ffowcs Williams-Hawkings equations are the most widely used for deterministic noise sources. Thickness and loading noise can be routinely predicted given good blade motion and blade loading inputs. Blade-vortex interaction (BVI) noise can also be predicted well with measured input data, but prediction of airloads with the high spatial and temporal resolution required for BVI is still difficult. No efficient prediction method for high speed impulsive noise is currently available, but much progress has been made. The best broadband noise prediction currently depends on semi-empirical methods.",
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Helicopter noise prediction : The current status and future direction. / Brentner, Kenneth Steven; Farassat, F.

In: Journal of Sound and Vibration, Vol. 170, No. 1, 10.02.1994, p. 79-96.

Research output: Contribution to journalArticle

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