Meteorological effects on long-range nonlinear propagation of jet noise from a static, high-performance military aircraft

2018 ◽  
Vol 144 (3) ◽  
pp. 1672-1672
Author(s):  
Brent O. Reichman ◽  
Kent L. Gee ◽  
Alan T. Wall
Keyword(s):  
Long Range ◽  
High Performance ◽  
Jet Noise ◽  
Nonlinear Propagation ◽  
Military Aircraft ◽  
Meteorological Effects

scholarly journals A vector intensity-based equivalent wavepacket model for high-performance military aircraft jet noise

2015 ◽  
Author(s):  
Eric B. Whiting ◽  
Kent L. Gee ◽  
Trevor A. Stout ◽  
Tracianne B. Neilsen ◽  
Alan T. Wall ◽  
...  
Keyword(s):  
High Performance ◽  
Jet Noise ◽  
Military Aircraft

Wavepacket source modeling of high-performance military aircraft jet noise from cross-beamforming analysis

2016 ◽  
Vol 140 (4) ◽  
pp. 3097-3098
Author(s):  
Blaine M. Harker ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Jet Noise ◽  
Military Aircraft ◽  
Source Modeling

Spatiotemporal correlation of high-performance military aircraft jet noise

2015 ◽  
Vol 138 (3) ◽  
pp. 1892-1892
Author(s):  
Blaine M. Harker ◽  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
Alan T. Wall ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Jet Noise ◽  
Military Aircraft ◽  
Spatiotemporal Correlation

The “sound Of Freedom”: Characterizing Jet Noise From High-Performance Military Aircraft

2013 ◽  
Vol 9 (3) ◽  
pp. 8 ◽  
Author(s):  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Alan T. Wall ◽  
J. Micah Downing ◽  
Michael M. James
Keyword(s):  
High Performance ◽  
Jet Noise ◽  
Military Aircraft

Spatiotemporal-Correlation Analysis of Jet Noise from a High-Performance Military Aircraft

AIAA Journal ◽  
2016 ◽  
Vol 54 (5) ◽  
pp. 1554-1566 ◽  
Author(s):  
Blaine M. Harker ◽  
Tracianne B. Neilsen ◽  
Kent L. Gee ◽  
Alan T. Wall ◽  
Michael M. James
Keyword(s):  
Correlation Analysis ◽  
High Performance ◽  
Jet Noise ◽  
Military Aircraft ◽  
Spatiotemporal Correlation

Stable functionalized graphene oxide–cellulose nanofiber solid electrolytes with long-range 1D/2D ionic nanochannels

2019 ◽  
Vol 7 (36) ◽  
pp. 20871-20877 ◽  
Author(s):  
Wei Jia ◽  
Peiyi Wu
Keyword(s):  
Graphene Oxide ◽  
Fuel Cell ◽  
Long Range ◽  
Solid Electrolytes ◽  
High Performance ◽  
Cellulose Nanofiber ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide

High-performance NPGOM-CNF solid electrolytes with long-range 1D/2D ionic nanochannels for fuel cell applications.

‘Crackle’: an annoying component of jet noise

1975 ◽  
Vol 71 (2) ◽  
pp. 251-271 ◽  
Author(s):  
J. E. Ffowcs Williams ◽  
J. Simson ◽  
V. J. Virchis
Keyword(s):  
High Speed ◽  
Angular Position ◽  
Jet Noise ◽  
Wide Frequency Range ◽  
Nonlinear Propagation ◽  
Wave Form ◽  
Long Term Effects ◽  
Recorded Sound ◽  
Recording Process

The paper describes an investigation of a subjectively distinguishable element of high speed jet noise known as ‘crackle’. ‘Crackle’ cannot be characterized by the normal spectral description of noise. It is shown to be due to intense spasmodic short-duration compressive elements of the wave form. These elements have low energy spread over a wide frequency range. The crackling of a large jet engine is caused by groups of sharp compressions in association with gradual expansions. The groups occur at random and persist for some 10−1s, each group containing about 10 compressions, typically of strength 5 × 10−3 atmos at a distance of 50 m. The skewness of the amplitude probability distribution of the recorded sound quantifies crackle, though the recording process probably changes the skewness level. Skewness values in excess of unity have been measured; noises with skewness less than 0·3 seem to be crackle free. Crackle is uninfluenced by the jet scale, but varies strongly with jet velocity and angular position. The jet temperature does not affect crackle, neither does combustion. Supersonic jets crackle strongly whether or not they are ideally expanded through convergent-divergent nozzles. Crackle is formed (we think) because of local shock formation due to nonlinear wave steepening at the source and not from long-term nonlinear propagation. Such long-term effects are important in flight, where they are additive. Some jet noise suppressors inhibit crackle.

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