Noise Source Localization and Optimization of Phased-Array Results

AIAA Journal ◽  
2009 ◽  
Vol 47 (11) ◽  
pp. 2520-2533 ◽  
Author(s):  
Patricio A. Ravetta ◽  
Ricardo A. Burdisso ◽  
Wing F. Ng
Keyword(s):  
Source Localization ◽  
Phased Array ◽  
Noise Source

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.

scholarly journals Phased Array Noise Source Localization Measurements of an F404 Nozzle Plume at Both Full and Model Scale

2010 ◽  
Author(s):  
Gary G. Podboy ◽  
James E. Bridges ◽  
Brenda S. Henderson
Keyword(s):  
Source Localization ◽  
High Performance ◽  
Phased Array ◽  
Noise Source ◽  
Jet Noise ◽  
Full Scale ◽  
Lessons Learned ◽  
Scale Model ◽  
Model Scale ◽  
Localization Data

A 48-microphone planar phased array system was used to acquire jet noise source localization data on both a full-scale F404-GE-F400 engine and on a 1/4th scale model of a F400 series nozzle. The full-scale engine test data show the location of the dominant noise sources in the jet plume as a function of frequency for the engine in both baseline (no chevron) and chevron configurations. Data are presented for the engine operating both with and without afterburners. Based on lessons learned during this test, a set of recommendations are provided regarding how the phased array measurement system could be modified in order to obtain more useful acoustic source localization data on high-performance military engines in the future. The data obtained on the 1/4th scale F400 series nozzle provide useful insights regarding the full-scale engine jet noise source mechanisms, and document some of the differences associated with testing at model-scale versus full-scale.

Acoustic beamforming for noise source localization – Reviews, methodology and applications

2019 ◽  
Vol 120 ◽  
pp. 422-448 ◽  
Author(s):  
Paolo Chiariotti ◽  
Milena Martarelli ◽  
Paolo Castellini
Keyword(s):  
Source Localization ◽  
Noise Source

Inverse methods in aeroacoustic three-dimensional volumetric noise source localization and quantification

2020 ◽  
Vol 473 ◽  
pp. 115208 ◽  
Author(s):  
G. Battista ◽  
P. Chiariotti ◽  
M. Martarelli ◽  
P. Castellini
Keyword(s):  
Source Localization ◽  
Noise Source ◽  
Three Dimensional ◽  
Inverse Methods
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