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There are a total of 17 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Inlet Shape Effects on the Far-Field Sound of a Model Fan
Author(s): Clark, L. R.; Thomas, R. H.; Dougherty, R. P.; Farassat, F.; Gerhold, C. H.
Abstract: A wind tunnel test was conducted to determine the effects of inlet shape on fan radiated noise. Four inlet geometries, which included a long standard flight type inlet, a short, aggressive flight inlet a scarf inlet, and an ...
NASA Center: Langley Research Center
Publication Year: 1997
Added to NTRS: 2005-08-25
Accession Number: 97N22853; Document ID: 19970022279; Report Number: AIAA Paper 97-1589, NAS 1.15:112838, NASA-TM-112838
Azimuthal Patterns of the Radiated Sound Field from a Turbofan Model
Author(s): Thomas, R. H.; Farassat, F.; Clark, L. R.; Gerhold, C. H.
Abstract: The azimuthal directivity of a scale fan model was measured extensively. The model is a 12 inch diameter fan with 16 rotors and 40 stator vanes and tests were done at a tip speed of 905 ft/sec. Tests were conducted in an ...
NASA Center: Langley Research Center
Publication Year: 1997
Added to NTRS: 2005-08-25
Accession Number: 97N21019; Document ID: 19970019255; Report Number: AIAA Paper 97-1588, NAS 1.15:112833, NASA-TM-112833
Analytical study of twin-jet shielding
Author(s): Gerhold, C. H.
Abstract: An analytical model a three-dimensional model, of twin-jet shielding, consisting of a point noise source impinging on a cylinder of heated flow in which the temperature and flow velocity are uniform across the cross-section ...
NASA Center: NASA (non Center Specific)
Publication Year: 1980
Added to NTRS: 2004-11-03
Accession Number: 82N16803; Document ID: 19820008929; Report Number: NASA-CR-165104
Modified jet noise source model for twin-jet shielding analysis
Author(s): Gerhold, C. H.; Kim, C.
Abstract: An analytical method to estimate the influence that a jet of heated flow has on the noise emission from a parallel jet is presented. The shielding jet is modelled as a cylinder of constant cross-section in which the flow ...
NASA Center: NASA (non Center Specific)
Publication Year: 1983
Added to NTRS: 2004-11-03
Accession Number: 83A25960; Document ID: 19830044742; Report Number: AIAA PAPER 83-0776
Analytical model of jet shielding
Author(s): Gerhold, C. H.
Abstract: An analytical model of the shielding of a stationary point noise source by a cylindrical jet is developed. The directivity function is derived which estimates the normalized sound pressure level at a far field receiver. The ...
NASA Center: NASA (non Center Specific)
Publication Year: 1982
Added to NTRS: 2004-11-03
Accession Number: 82A17754; Document ID: 19820034219; Report Number: AIAA PAPER 82-0051
Analytical study of twin-jet shielding
Author(s): Gerhold, C. H.
Abstract: Development of jet noise source model, and comparison to experiments with a point noise source are summarized. The refinement of the noise source is expected to resolve discrepancies noted between previous analytical results ...
NASA Center: NASA (non Center Specific)
Publication Year: 1981
Added to NTRS: 2004-11-03
Accession Number: 82N16802; Document ID: 19820008928; Report Number: NASA-CR-165103
Analytical study of twin-jet shielding development of a 3-dimensional model
Author(s): Gerhold, C. H.
Abstract: The solution for a point source impinging on a cylinder of heated flow is presented. The indefinite integral is solved approximately using a saddle of point method. Comparison of the three-dimensional model to a previously ...
NASA Center: NASA (non Center Specific)
Publication Year: 1980
Added to NTRS: 2004-11-03
Accession Number: 82N16805; Document ID: 19820008931; Report Number: NASA-CR-165106
Active vibration control in microgravity environment
Author(s): Gerhold, C. H.; Rocha, R.
Abstract: An active control process to reduce vibration transmitted from the Space Station structure to the vibration sensitive payload is evaluated. A low-friction air-bearing table is used to approximate zero gravity in the ...
NASA Center: Johnson Space Center
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 88A31565; Document ID: 19880044338
Analytical study of twin-jet shielding
Author(s): Gerhold, C. H.
Abstract: The development of an analytical model, an aircraft noise prediction computer program, to estimate the shielding of one jet by an adjacent jet in a twin jet configuration, is discussed. Noise estimations included ...
NASA Center: NASA (non Center Specific)
Publication Year: 1980
Added to NTRS: 2004-11-03
Accession Number: 82N16804; Document ID: 19820008930; Report Number: NASA-CR-165105
Modified shielding jet model for twin-jet shielding analysis
Author(s): Gerhold, C. H.; Gilbride, J.
Abstract: An analytical model to estimate the shielding of noise emitted from a point noise source has been developed assuming the shielding jet to be a cylinder of constant radius with uniform flow across the cross section. ...
NASA Center: NASA (non Center Specific)
Publication Year: 1983
Added to NTRS: 2004-11-03
Accession Number: 84A30648; Document ID: 19840047861; Report Number: ASME PAPER 83-WA/NCA-2
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