Bicoherence analysis of model-scale jet noise

Kent L. Gee; Anthony A. Atchley; Lauren E. Falco; Micah R. Shepherd; Lawrence S. Ukeiley; Bernard J. Jansen; John M. Seiner

doi:10.1121/1.3484492

Bicoherence analysis of model-scale jet noise

Kent L. Gee, Anthony A. Atchley, Lauren E. Falco, Micah R. Shepherd, Lawrence S. Ukeiley, Bernard J. Jansen, John M. Seiner

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29 Scopus citations

Abstract

Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.

Original language	English (US)
Pages (from-to)	EL211-EL216
Journal	Journal of the Acoustical Society of America
Volume	128
Issue number	5
DOIs	https://doi.org/10.1121/1.3484492
State	Published - Nov 2010

All Science Journal Classification (ASJC) codes

Arts and Humanities (miscellaneous)
Acoustics and Ultrasonics

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title = "Bicoherence analysis of model-scale jet noise",

abstract = "Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.",

author = "Gee, {Kent L.} and Atchley, {Anthony A.} and Falco, {Lauren E.} and Shepherd, {Micah R.} and Ukeiley, {Lawrence S.} and Jansen, {Bernard J.} and Seiner, {John M.}",

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AU - Gee, Kent L.

AU - Atchley, Anthony A.

AU - Falco, Lauren E.

AU - Shepherd, Micah R.

AU - Ukeiley, Lawrence S.

AU - Jansen, Bernard J.

AU - Seiner, John M.

N1 - Funding Information: This work was supported in part by the Office of Naval Research.

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Y1 - 2010/11

N2 - Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.

AB - Bicoherence analysis has been used to characterize nonlinear effects in the propagation of noise from a model-scale, Mach-2.0, unheated jet. Nonlinear propagation effects are predominantly limited to regions near the peak directivity angle for this jet source and propagation range. The analysis also examines the practice of identifying nonlinear propagation by comparing spectra measured at two different distances and assuming far-field, linear propagation between them. This spectral comparison method can lead to erroneous conclusions regarding the role of nonlinearity when the observations are made in the geometric near field of an extended, directional radiator, such as a jet.

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Bicoherence analysis of model-scale jet noise

Abstract

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