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Aeroacoustic Codes for Rotor Harmonic and BVI Noise. CAMRAD.Mod1/HIRES: Methodology and Users' ManualThis document details the methodology and use of the CAMRAD.Mod1/HIRES codes, which were developed at NASA Langley Research Center for the prediction of helicopter harmonic and Blade-Vortex Interaction (BVI) noise. CANMAD.Mod1 is a substantially modified version of the performance/trim/wake code CANMAD. High resolution blade loading is determined in post-processing by HIRES and an associated indicial aerodynamics code. Extensive capabilities of importance to noise prediction accuracy are documented, including a new multi-core tip vortex roll-up wake model, higher harmonic and individual blade control, tunnel and fuselage correction input, diagnostic blade motion input, and interfaces for acoustic and CFD aerodynamics codes. Modifications and new code capabilities are documented with examples. A users' job preparation guide and listings of variables and namelists are given.
Document ID
19980148012
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Boyd, D. Douglas, Jr.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Brooks, Thomas F.
(NASA Langley Research Center Hampton, VA United States)
Burley, Casey L.
(NASA Langley Research Center Hampton, VA United States)
Jolly, J. Ralph, Jr.
(Jolly Development Corp. Birmingham, AL United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1998
Subject Category
Acoustics
Report/Patent Number
NAS 1.26:207640
NASA/TM-1998-207640
L-17697
Funding Number(s)
PROJECT: RTOP 581-20-21-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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