Jet-noise control by fluidic injection from a rotating plug: linear and non-linear sound source mechanisms

2013 ◽  
Author(s):  
Maxime Koenig ◽  
André V. Cavalieri ◽  
Peter Jordan ◽  
Yves Gervais
Keyword(s):  
Sound Source ◽  
Noise Control ◽  
Jet Noise ◽  
Non Linear ◽  
Source Mechanisms

scholarly journals Prediction of installed jet noise

2016 ◽  
Vol 811 ◽  
pp. 234-268 ◽  
Author(s):  
B. Lyu ◽  
A. P. Dowling ◽  
I. Naqavi
Keyword(s):  
Sound Source ◽  
Near Field ◽  
Jet Noise ◽  
Frequency Noise ◽  
Acoustic Analogy ◽  
Mean Flow ◽  
Trailing Edge ◽  
Surface Reflection ◽  
Edge Scattering ◽  
Source Mechanisms

A semianalytical model for installed jet noise is proposed in this paper. We argue and conclude that there exist two distinct sound source mechanisms for installed jet noise, and the model is therefore composed of two parts to account for these different sound source mechanisms. Lighthill’s acoustic analogy and a fourth-order space–time correlation model for the Lighthill stress tensor are used to model the sound induced by the equivalent turbulent quadrupole sources, while the trailing-edge scattering of near-field evanescent instability waves is modelled using Amiet’s approach. A non-zero ambient mean flow is taken into account. It is found that, when the rigid surface is not so close to the jet as to affect the turbulent flow field, the trailing-edge scattering of near-field evanescent waves dominates the low-frequency amplification of installed jet noise in the far-field. The high-frequency noise enhancement on the reflected side is due to the surface reflection effect. The model agrees well with experimental results at different observer angles, apart from deviations caused by the mean-flow refraction effect at high frequencies at low observer angles.

scholarly journals A Double Wall Noise Control Enclosure for an Impulsive Sound Source

1961 ◽  
Vol 33 (6) ◽  
pp. 834-834
Author(s):  
Robert M. Hoover ◽  
Lloyd J. Williams
Keyword(s):  
Sound Source ◽  
Noise Control ◽  
Double Wall

A new sub-bottom profiling sonar using a non-linear sound source

1977 ◽  
Vol 47 (3) ◽  
pp. 105 ◽  
Author(s):  
P. Pettersen ◽  
J.M. Hovem ◽  
A. Lo̸vik ◽  
T. Knudsen
Keyword(s):  
Sound Source ◽  
Non Linear

Supersonic jet noise control via trailing edge modifications

2001 ◽  
Vol 15 (8) ◽  
pp. 1174-1180
Author(s):  
Jin-Hwa Kim ◽  
Seungbae Lee
Keyword(s):  
Noise Control ◽  
Supersonic Jet ◽  
Jet Noise ◽  
Trailing Edge ◽  
Supersonic Jet Noise

Study on Noise Control Effect of Secondary Sound Source Distribution in Vehicle Interior

電腦學刊 ◽  
2021 ◽  
Vol 32 (6) ◽  
pp. 248-253
Author(s):  
Chaofeng Lan Chaofeng Lan ◽  
Lei Zhang Chaofeng Lan ◽  
Shou Lv Lei Zhang ◽  
Rongrong Han Shou Lv
Keyword(s):  
Sound Source ◽  
Noise Control ◽  
Source Distribution ◽  
Control Effect ◽  
Vehicle Interior

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