Source Localization of Crackle-Related Events in Military Aircraft Jet Noise

AIAA Journal ◽  
2021 ◽  
pp. 1-11
Author(s):  
Aaron B. Vaughn ◽  
Kent L. Gee ◽  
S. Hales Swift ◽  
Kevin M. Leete ◽  
Alan T. Wall ◽  
...  
Keyword(s):  
Source Localization ◽  
Jet Noise ◽  
Military Aircraft

scholarly journals Jet-Surface Interaction Test: Phased Array Noise Source Localization Results

2012 ◽  
Author(s):  
Gary G. Podboy
Keyword(s):  
Source Localization ◽  
Phased Array ◽  
Noise Source ◽  
Jet Noise ◽  
Companion Paper ◽  
Far Field ◽  
Sound Waves ◽  
Axial Distribution ◽  
Noise Sources ◽  
Interaction Test

An experiment was conducted to investigate the effect that a planar surface located near a jet flow has on the noise radiated to the far-field. Two different configurations were tested: 1) a shielding configuration in which the surface was located between the jet and the far-field microphones, and 2) a reflecting configuration in which the surface was mounted on the opposite side of the jet, and thus the jet noise was free to reflect off the surface toward the microphones. Both conventional far-field microphone and phased array noise source localization measurements were obtained. This paper discusses phased array results, while a companion paper discusses far-field results. The phased array data show that the axial distribution of noise sources in a jet can vary greatly depending on the jet operating condition and suggests that it would first be necessary to know or be able to predict this distribution in order to be able to predict the amount of noise reduction to expect from a given shielding configuration. The data obtained on both subsonic and supersonic jets show that the noise sources associated with a given frequency of noise tend to move downstream, and therefore, would become more difficult to shield, as jet Mach number increases. The noise source localization data obtained on cold, shock-containing jets suggests that the constructive interference of sound waves that produces noise at a given frequency within a broadband shock noise hump comes primarily from a small number of shocks, rather than from all the shocks at the same time. The reflecting configuration data illustrates that the law of reflection must be satisfied in order for jet noise to reflect off of a surface to an observer, and depending on the relative locations of the jet, the surface, and the observer, only some of the jet noise sources may satisfy this requirement.

Near to far field relationship of crackle-related events in military aircraft jet noise

2020 ◽  
Vol 148 (4) ◽  
pp. 2617-2617
Author(s):  
Aaron B. Vaughn ◽  
Kent L. Gee ◽  
Kevin M. Leete ◽  
J. M. Downing
Keyword(s):  
Jet Noise ◽  
Far Field ◽  
Military Aircraft ◽  
Relationship Of ◽  
Field Relationship

Acoustics measurements of military-style supersonic beveled nozzle jets with interior corrugations

2016 ◽  
Vol 16 (1-2) ◽  
pp. 21-43 ◽  
Author(s):  
Russell W Powers ◽  
Dennis K McLaughlin
Keyword(s):  
Noise Reduction ◽  
Acoustic Field ◽  
High Speed ◽  
Supersonic Jet ◽  
Jet Noise ◽  
Operating Conditions ◽  
Military Aircraft ◽  
Azimuthal Dependence ◽  
Penn State ◽  
Mixing Noise

Increasingly powerful and noisy military aircraft have generated the need for research leading to the development of supersonic jet noise reduction devices. The hot, high speed supersonic jets exhausting from military aircraft during takeoff present a most challenging problem. The present study extends prior research on two methods of noise reduction. The first is the internal nozzle corrugations pioneered by Seiner et al. and the second is the beveled exit plane explored most recently by Viswanathan. A novel research idea of creating fluidic corrugations similar to the nozzle corrugations has been initiated by Penn State. To further the understanding and analysis of the fluidic corrugations, the present study focuses on the flow field and acoustic field of nozzles with two, three, and six conventional, hardwalled corrugations. The effect of the combination of the internal corrugations with a beveled nozzle is explored. The results show that significant noise reductions of over 3 dB of the mixing noise and the broadband shock-associated noise can be achieved. The combination of the beveled nozzle and the internal nozzle corrugations showed that there is less azimuthal dependence of the acoustic field than for the purely beveled nozzle. The combination nozzle was shown to reduce the noise over a wider range of polar angles and operating conditions than either the purely beveled nozzle or the purely corrugated nozzle.

Beamforming Algorithm for Distributed Source Localization and Its Application to Jet Noise

AIAA Journal ◽  
2003 ◽  
Vol 41 (7) ◽  
pp. 1238-1246 ◽  
Author(s):  
Saligrama R. Venkatesh ◽  
David R. Polak ◽  
Satish Narayanan
Keyword(s):  
Source Localization ◽  
Jet Noise ◽  
Distributed Source ◽  
Beamforming Algorithm

Correlation analysis of military aircraft jet noise

2013 ◽  
Vol 134 (5) ◽  
pp. 4094-4094
Author(s):  
Zachary Anderson ◽  
Blaine M. Harker ◽  
Kent L. Gee ◽  
Tracianne B. Neilsen ◽  
Michael M. James
Keyword(s):  
Correlation Analysis ◽  
Jet Noise ◽  
Military Aircraft

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
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