PREDICTION OF HELICOPTER ROTOR DISCRETE FREQUENCY NOISE: A COMPUTER PROGRAM INCORPORATING REALISTIC BLADE MOTIONS AND ADVANCED ACOUSTIC FORMULATION.

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

26 Citations (Scopus)

Abstract

A computer program has been developed at the NASA Langley Research Center to predict the discrete frequency noise of conventional and advanced helicopter rotors. The program, called WOPWOP, uses the most advanced subsonic formulation of Farassat that is less sensitive to errors and is valid for nearly all helicopter rotor geometries and flight conditions. A brief derivation of the acoustic formulation is presented along with a discussion of the numerical implementation of the formulation. The computer program uses realistic helicopter blade motion and aerodynamic loadings, input by the user, for noise calculation in the time domain. A detailed definition of all the input variables, default values, and output data is included.

Original languageEnglish (US)
Title of host publicationNASA Technical Memorandum
StatePublished - Oct 1986

Fingerprint

acoustics
software
prediction
aerodynamics
flight
geometry
calculation
research centre
programme

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

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title = "PREDICTION OF HELICOPTER ROTOR DISCRETE FREQUENCY NOISE: A COMPUTER PROGRAM INCORPORATING REALISTIC BLADE MOTIONS AND ADVANCED ACOUSTIC FORMULATION.",
abstract = "A computer program has been developed at the NASA Langley Research Center to predict the discrete frequency noise of conventional and advanced helicopter rotors. The program, called WOPWOP, uses the most advanced subsonic formulation of Farassat that is less sensitive to errors and is valid for nearly all helicopter rotor geometries and flight conditions. A brief derivation of the acoustic formulation is presented along with a discussion of the numerical implementation of the formulation. The computer program uses realistic helicopter blade motion and aerodynamic loadings, input by the user, for noise calculation in the time domain. A detailed definition of all the input variables, default values, and output data is included.",
author = "Brentner, {Kenneth Steven}",
year = "1986",
month = "10",
language = "English (US)",
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PREDICTION OF HELICOPTER ROTOR DISCRETE FREQUENCY NOISE : A COMPUTER PROGRAM INCORPORATING REALISTIC BLADE MOTIONS AND ADVANCED ACOUSTIC FORMULATION. / Brentner, Kenneth Steven.

NASA Technical Memorandum. 1986.

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

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