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There are a total of 26 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Spectral Characteristics of Wake Vortex Sound During Roll-Up
Author(s): Zhang, Yan; Wang, Frank Y.; Hardin, Jay C.
Abstract: This report presents an analysis of the sound spectra generated by a trailing aircraft vortex during its rolling-up process. The study demonstrates that a rolling-up vortex could produce low frequency (less than 100 Hz) ...
NASA Center: Langley Research Center
Publication Year: 2003
Added to NTRS: 2005-10-13
Document ID: 20040013294; Report Number: NASA/CR-2003-212673
Sound Generation by Aircraft Wake Vortices
Author(s): Hardin, Jay C.; Wang, Frank Y.
Abstract: This report provides an extensive analysis of potential wake vortex noise sources that might be utilized to aid in their tracking. Several possible mechanisms of aircraft vortex sound generation are examined on the basis of ...
NASA Center: Langley Research Center
Publication Year: 2003
Added to NTRS: 2005-08-25
Document ID: 20040006312; Report Number: NASA/CR-2003-212674
Reynolds number influences in aeronautics
Author(s): Bushnell, Dennis M.; Yip, Long P.; Yao, Chung-Sheng; Lin, John C.; Lawing, Pierce L.; Batina, John T.; Hardin, Jay C.; Horvath, Thomas J.; Fenbert, James W.; Domack, Christopher S.
Abstract: Reynolds number, a measure of the ratio of inertia to viscous forces, is a fundamental similarity parameter for fluid flows and therefore, would be expected to have a major influence in aerodynamics and aeronautics. Reynolds ...
NASA Center: Langley Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 93N31732; Document ID: 19930022543; Report Number: NAS 1.15:107730, NASA-TM-107730
A new class of random processes with application to helicopter noise
Author(s): Hardin, Jay C.; Miamee, A. G.
Abstract: The concept of dividing random processes into classes (e.g., stationary, locally stationary, periodically correlated, and harmonizable) has long been employed. A new class of random processes is introduced which includes ...
NASA Center: Langley Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N26679; Document ID: 19890017308; Report Number: NAS 1.26:185037, NASA-CR-185037
On a class of nonstationary stochastic processes
Author(s): Miamee, A. G.; Hardin, Jay C.
Abstract: A new class of nonstationary stochastic processes is introduced and some of the essential properties of its members are investigated. This class is richer than the class of stationary processes and has the potential of ...
NASA Center: Langley Research Center
Publication Year: 1989
Added to NTRS: 2005-08-25
Accession Number: 89N17448; Document ID: 19890008077; Report Number: NAS 1.15:101195, NASA-TM-101195
Computational aeroacoustics applied to active noise control
Author(s): Hardin, Jay C.
Abstract: Computational Aeroacoustics (CAA) is a rapidly developing new technology that allows computation of the generation and propagation of sound from first principle governing equations. This paper discusses the application of ...
NASA Center: Langley Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Accession Number: 96N23673; Document ID: 19960018346; Report Number: NAS 1.15:111338, NASA-TM-111338, SAE-TP-951645
A new class of random processes with application to helicopter noise
Author(s): Hardin, Jay C.; Miamee, A. G.
Abstract: The concept of dividing random processes into classes (e.g., stationary, locally stationary, periodically correlated, and harmonizable) has long been employed. A new class of random processes is introduced which includes ...
NASA Center: Langley Research Center
Publication Year: 1989
Added to NTRS: 2004-11-03
Accession Number: 90A42874; Document ID: 19900055819
Numerical predictions in acoustics
Author(s): Hardin, Jay C.
Abstract: Computational Aeroacoustics (CAA) involves the calculation of the sound produced by a flow as well as the underlying flowfield itself from first principles. This paper describes the numerical challenges of CAA and recent ...
NASA Center: Langley Research Center
Publication Year: 1992
Added to NTRS: 2004-11-03
Accession Number: 93A55854; Document ID: 19930071857
Ring vortex/cylinder sound production revisited
Author(s): Hardin, Jay C.; Pope, D. S.
Abstract: The acoustic radiation produced by the passage of a vortex ring near a circular cylinder is calculated utilizing the Coriolis acceleration of the vortex as the source term and the low frequency Green's function approach. ...
NASA Center: Langley Research Center
Publication Year: 1987
Added to NTRS: 2004-11-03
Accession Number: 88A16535; Document ID: 19880029308; Report Number: AIAA PAPER 87-2671
Application of computational aero-acoustics to real world problems
Author(s): Hardin, Jay C.
Abstract: The application of computational aeroacoustics (CAA) to real problems is discussed in relation to the analysis performed with the aim of assessing the application of the various techniques. It is considered that the ...
NASA Center: Langley Research Center
Publication Year: 1996
Added to NTRS: 2004-11-03
Accession Number: 96N36003; Document ID: 19960053070
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