Karhunen-Loeve decomposition for non stationary propulsor flow noise.

机译：非平稳推进器流动噪声的Karhunen-Loeve分解。

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The aim of this thesis is to develop a theory for non stationary propulsor flow noise. The model which is proposed is based on Amiet's paper "Acoustic Radiation from an Airfoil in a Turbulent Stream" [1], which describes broad band noise when a simple model of airfoil interacts with a turbulent flow, under the assumption of stationarity. The Karhunen-Loeve method provides a set of modes which describe the turbulent flow without the assumption of stationarity. A method is described to obtain broad band noise calculations when the mean turbulent flow varies with time and produces non stationary turbulence. A comparison of the numerical results obtained with the results from the paper of reference [1] shows the characteristics of time varying sound radiation. The various mathematical formulae will give a starting point to the analysis of real time varying flows, which are not considered in this thesis.

机译：本文的目的是为非平稳推进器流动噪声建立一个理论。提出的模型基于Amiet的论文“湍流中翼型的声辐射” [1]，该模型描述了假设平稳的翼型简单模型与湍流相互作用时的宽带噪声。 Karhunen-Loeve方法提供了一组模式，这些模式描述了湍流而不假定平稳性。描述了一种当平均湍流随时间变化并产生非平稳湍流时获得宽带噪声计算的方法。将数值结果与参考文献[1]的结果进行比较，可以发现时变声辐射的特征。各种数学公式将为实时变化流的分析提供一个起点，本文没有考虑。

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作者
Kersulec, Jean-Luc.;
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作者单位

Florida Atlantic University.;

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授予单位 Florida Atlantic University.;
学科 Engineering Marine and Ocean.; Physics Acoustics.
学位 M.S.
年度 2005
页码 101 p.
总页数 101
原文格式 PDF
正文语种 eng
中图分类海洋工程;声学;
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Karhunen-Loeve decomposition for non stationary propulsor flow noise.

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