Single-point nonlinearity indicators for the propagation of high-amplitude jet noise

2008 ◽  
Author(s):  
Lauren E. Falco ◽  
Anthony A. Atchley ◽  
Bengt Enflo ◽  
Claes M. Hedberg ◽  
Leif Kari
Keyword(s):  
Single Point ◽  
Jet Noise ◽  
High Amplitude

Comparison of nonlinear, geometric, and absorptive effects in high-amplitude jet noise propagation

2014 ◽  
Vol 136 (4) ◽  
pp. 2102-2102 ◽  
Author(s):  
Brent O. Reichman ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Joseph J. Thaden ◽  
Michael M. James
Keyword(s):  
Jet Noise ◽  
High Amplitude ◽  
Noise Propagation ◽  
Nonlinear Geometric

On the Prediction of Turbulent Jet Noise Using Traditional Aeroacoustic Methods

2005 ◽  
Vol 4 (3) ◽  
pp. 289-323 ◽  
Author(s):  
K.M. Khritov ◽  
V.Ye. Kozlov ◽  
S.Yu. Krasheninnikov ◽  
A.B. Lebedev ◽  
D.A. Lyubimov ◽  
...  
Keyword(s):  
Single Point ◽  
Jet Noise ◽  
Point Of View ◽  
Turbulent Jet ◽  
Prediction Methods ◽  
Noise Prediction ◽  
Classical Literature ◽  
Boeing Company ◽  
The Many ◽  
Theoretical Results

Several experimental, computational and theoretical results devoted to turbulence jet noise are described. All these results were obtained at CIAM in collaboration with the Boeing Company. The selected topics are combined and described from a single point of view. In spite of the many publications in the classical literature devoted to jet noise, many jet noise problems are not completely solved, and most current jet noise prediction methods are still highly empirical and rely heavily on an existing experimental data base. At the same time, many of the available experimental results are not fully reliable and some are even contradictory. The goal of this paper is, therefore, to explore and discuss some of the possibilities and limitations of classical aeroacoustics methods.

Analysis of high‐amplitude jet noise using nonlinearity indicators

2006 ◽  
Vol 119 (5) ◽  
pp. 3384-3384
Author(s):  
Kent L. Gee ◽  
Micah R. Shepherd ◽  
Lauren E. Falco ◽  
Anthony A. Atchley ◽  
Lawrence S. Ukeiley ◽  
...  
Keyword(s):  
Jet Noise ◽  
High Amplitude

On the Perception of Crackle in High-Amplitude Jet Noise

AIAA Journal ◽  
2007 ◽  
Vol 45 (3) ◽  
pp. 593-598 ◽  
Author(s):  
Kent L. Gee ◽  
Victor W. Sparrow ◽  
Anthony Atchley ◽  
Thomas B. Gabrielson
Keyword(s):  
Jet Noise ◽  
High Amplitude

Bispectral Analysis of High-Amplitude Jet Noise

2005 ◽  
Author(s):  
Kent Gee ◽  
Anthony Atchley ◽  
Lauren Falco ◽  
Thomas Gabrielson ◽  
Victor Sparrow
Keyword(s):  
Jet Noise ◽  
High Amplitude ◽  
Bispectral Analysis

Fine-scale taxonomic and temporal variability in the energy density of invertebrate prey of juvenile Chinook salmon Oncorhynchus tshawytscha

2020 ◽  
Vol 655 ◽  
pp. 185-198
Author(s):  
J Weil ◽  
WDP Duguid ◽  
F Juanes
Keyword(s):  
Energy Density ◽  
Chinook Salmon ◽  
Temporal Variability ◽  
Energy Content ◽  
Single Point ◽  
Single Species ◽  
Fine Scale ◽  
Temporal Differences ◽  
Juvenile Chinook Salmon ◽  
Juvenile Chinook

Variation in the energy content of prey can drive the diet choice, growth and ultimate survival of consumers. In Pacific salmon species, obtaining sufficient energy for rapid growth during early marine residence is hypothesized to reduce the risk of size-selective mortality. In order to determine the energetic benefit of feeding choices for individuals, accurate estimates of energy density (ED) across prey groups are required. Frequently, a single species is assumed to be representative of a larger taxonomic group or related species. Further, single-point estimates are often assumed to be representative of a group across seasons, despite temporal variability. To test the validity of these practices, we sampled zooplankton prey of juvenile Chinook salmon to investigate fine-scale taxonomic and temporal differences in ED. Using a recently developed model to estimate the ED of organisms using percent ash-free dry weight, we compared energy content of several groups that are typically grouped together in growth studies. Decapod megalopae were more energy rich than zoeae and showed family-level variability in ED. Amphipods showed significant species-level variability in ED. Temporal differences were observed, but patterns were not consistent among groups. Bioenergetic model simulations showed that growth rate of juvenile Chinook salmon was almost identical when prey ED values were calculated on a fine scale or on a taxon-averaged coarse scale. However, single-species representative calculations of prey ED yielded highly variable output in growth depending on the representative species used. These results suggest that the latter approach may yield significantly biased results.

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