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A computer program to predict rotor rotational noise of a stationary rotor from blade loading coefficientThe programing language used is FORTRAN IV. A description of all main and subprograms is provided so that any user possessing a FORTRAN compiler and random access capability can adapt the program to his facility. Rotor blade surface-pressure spectra can be used by the program to calculate: (1) blade station loading spectra, (2) chordwise and/or spanwise integrated blade-loading spectra, and (3) far-field rotational noise spectra. Any of five standard inline functions describing the chordwise distribution of the blade loading can be chosen in order to study parametrically the acoustic predictions. The program output consists of both printed and graphic descriptions of the blade-loading coefficient spectra and far-field acoustic spectrum. The results may also be written on binary file for future processing. Examples of the application of the program along with a description of the rotational noise prediction theory on which the program is based are also provided.
Document ID
19760011801
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Ramakrishnan, R.
(George Washington Univ. Hampton, VA, United States)
Randall, D.
(Computer Sci. Corp.)
Hosier, R. N.
(NASA Langley Research Center)
Date Acquired
September 3, 2013
Publication Date
February 1, 1976
Subject Category
Acoustics
Report/Patent Number
L-9796
NASA-TM-X-3281
Accession Number
76N18889
Funding Number(s)
PROJECT: RTOP 505-10-26-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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