Nonlinear acoustics of an aperture under grazing flow

IF 2.9 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Alexander K. Stoychev, Tiemo Pedergnana, Nicolas Noiray
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引用次数: 0

Abstract

This work presents a mathematical model of a dynamically forced, acoustically compact aperture subject to one-sided mean grazing flow in two or three dimensions. By contrast to other simplified theoretical representations of a grazed aperture, the one proposed in this contribution considers some of the nonlinear effects a reduced order model should naturally inherit from the conservation equations governing the primary system’s dynamics. Furthermore, unlike other nonlinear developments, this one is able to reproduce the acoustic forcing amplitude dependence of the fundamental-frequency-based impedance, measured in recent experiments, without relying on empirical parameters. This nonlinear model offers further insight into the dominant physical mechanisms determining the aforementioned behaviour and allows reasonable a priori estimates of the aeroacoustic dynamics of the aperture. This could be used as a building block of more sophisticated systems or for the derivation of even simpler representations suitable for acoustic network modelling.
放牧流下孔隙的非线性声学特性
这项研究提出了一个在二维或三维空间中受到单侧平均掠流作用的动态受迫声学紧凑孔径的数学模型。与其他放牧光圈的简化理论表述相比,本论文提出的模型考虑了一些非线性效应,这些效应是一个低阶模型应自然地从支配主系统动力学的守恒方程中继承的。此外,与其他非线性模型不同的是,该模型能够再现基频阻抗的声学强迫振幅依赖性,而不依赖于最近的实验所测得的经验参数。这一非线性模型有助于进一步了解决定上述行为的主要物理机制,并可对孔径的气声动力学进行合理的先验估计。它可以作为更复杂系统的构件,或用于推导适合声学网络建模的更简单的表示方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
5.70%
发文量
227
审稿时长
3.0 months
期刊介绍: Proceedings A has an illustrious history of publishing pioneering and influential research articles across the entire range of the physical and mathematical sciences. These have included Maxwell"s electromagnetic theory, the Braggs" first account of X-ray crystallography, Dirac"s relativistic theory of the electron, and Watson and Crick"s detailed description of the structure of DNA.
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