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The numerical simulation of propagation of intensive acoustic noise
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
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2013 (English)Conference paper (Refereed)
Abstract [en]

The propagation of intensive acoustic noise is of fundamental interest in nonlinear acoustics. Some of the simplest models describing such phenomena are generalized Burgers’ equations for finite amplitude sound waves. An important problem in this field is to find the wave’s behavior far from the emitting source for stochastic initial waveforms. The method of numerical solution of generalized Burgers equation proposed is step-by-step calculation supported on using Fast Fourier Transform of the considered signal. The general idea is to keep only Fourier image of concerned signal and update it recursively (in space). For simulating the wave evolution we used 4096 (212) point realizations and took averaging over 1000 realizations. Also the object of the present study is a numerical analysis of the spectral and bispectral functions of the intense random signals propagating in nondispersive nonlinear media. The possibility of recovering the input spectrum from the measured spectrum and bispectrum at the output of the nonlinear medium is discusses. The analytical estimations are supported by numerical simulation. For two different types of primary spectrum evolution of jet noise were numerically simulates at a short distance and assayed bispectrum and a spectrum analysis of the signals.

Place, publisher, year, edition, pages
San Francisco, 2013.
National Category
Mathematical Analysis Fluid Mechanics and Acoustics Applied Mechanics
URN: urn:nbn:se:bth-6493DOI: 10.1121/1.4800940Local ID: diva2:834011
Acoustical Society of America Meeting
Available from: 2014-12-05 Created: 2014-12-05 Last updated: 2016-09-08Bibliographically approved

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Rudenko, Oleg
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Department of Mechanical Engineering
Mathematical AnalysisFluid Mechanics and AcousticsApplied Mechanics

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