Computational aeroacoustics of phonation, Part I: Computational methods and sound generation mechanisms

2002 ◽  
Vol 112 (5) ◽  
pp. 2134-2146 ◽  
Author(s):  
Wei Zhao ◽  
Cheng Zhang ◽  
Steven H. Frankel ◽  
Luc Mongeau
Keyword(s):  
Computational Methods ◽  
Computational Aeroacoustics ◽  
Sound Generation ◽  
Generation Mechanisms

DNS of a plane mixing layer for the investigation of sound generation mechanisms

2008 ◽  
Vol 37 (4) ◽  
pp. 360-368 ◽  
Author(s):  
Andreas Babucke ◽  
Markus Kloker ◽  
Ulrich Rist
Keyword(s):  
Mixing Layer ◽  
Sound Generation ◽  
Plane Mixing Layer ◽  
Generation Mechanisms

scholarly journals Derivation of Lighthill’s Eighth Power Law of an Aeroacoustic Quadrupole in Acoustic Spacetime

Acoustics ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 666-673
Author(s):  
Drasko Masovic ◽  
Ennes Sarradj
Keyword(s):  
Power Law ◽  
Sound Propagation ◽  
Dimensional Manifold ◽  
Sound Waves ◽  
Sound Generation ◽  
Speed Of Light ◽  
Acoustic Analogy ◽  
Analytical Treatment ◽  
Weak Perturbation ◽  
Generation Mechanisms

Acoustic spacetime is a four-dimensional manifold analogue to the relativistic spacetime with the reference speed of light replaced by the speed of sound. It has been established primarily for the indirect studies of relativistic phenomena by means of their better understood acoustic analogues. More recently, it has also been used for the analytical treatment of sound propagation in various uniform and non-uniform flows of the background fluid. In this paper the analogy is extended and utilized to derive Lighthill’s eight power law for sound generation of an aeroacoustic quadrupole. Adding to the existing analogue theory, propagating sound waves are described in terms of a weak perturbation of the background acoustic spacetime metric. The obtained result proves that the acoustic analogy can be extended to cover both weak perturbation of the fluid due to the sound waves and certain sound generation mechanisms, at least in incompressible low Mach number flows.

Gas Turbine Engine Noise

2008 ◽  
Author(s):  
R. Mankbadi
Keyword(s):  
Gas Turbine ◽  
Large Eddy Simulations ◽  
Turbine Engines ◽  
Computational Aeroacoustics ◽  
Gas Turbine Engines ◽  
Sound Generation ◽  
Noise Sources ◽  
Turbine Engine ◽  
Large Eddy ◽  
Radiated Sound

This article discusses the various noise sources associated with gas turbine engines and the computational aeroacoustics techniques used for predicting the aerodynamically-generated sound. Given a sound source, several tools are presented for predicting the corresponding radiated sound. Results for sound-generation mechanism are presented using large- or very-large eddy simulations, as well as other computational means. A brief summary of the main concepts for noise reduction are then presented.

Pile driving noise: Source level and sound generation mechanisms.

2011 ◽  
Vol 129 (4) ◽  
pp. 2461-2461
Author(s):  
Christ A. F. de Jong ◽  
Mario Zampolli ◽  
Michael A. Ainslie ◽  
Erwin W. Jansen ◽  
Laurent Fillinger ◽  
...  
Keyword(s):  
Noise Source ◽  
Pile Driving ◽  
Sound Generation ◽  
Source Level ◽  
Generation Mechanisms

scholarly journals Investigation of the sound generation mechanisms for in-duct orifice plates

2017 ◽  
Vol 142 (2) ◽  
pp. 561-572 ◽  
Author(s):  
Fuyang Tao ◽  
Phillip Joseph ◽  
Xin Zhang ◽  
Oksana Stalnov ◽  
Matthias Siercke ◽  
...  
Keyword(s):  
Sound Generation ◽  
Generation Mechanisms
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