Kevlar风洞壁的声传输损耗和噪声

IF 1.2 4区工程技术 Q3 ACOUSTICS

International Journal of Aeroacoustics Pub Date : 2022-07-11 DOI:10.1177/1475472X221107497

S. Glegg, Máté Szőke, W. Devenport

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引用次数: 0

摘要

本文将建立凯夫拉纤维风洞壁的声传输损失和自噪声模型。实验结果表明，织物的孔隙率是影响织物传输损失的最重要因素，而风洞流速对织物传输损失的影响是增大的。此外，建立了凯夫拉纤维风洞壁面产生的编织噪声模型，发现这种噪声是由流体通过凯夫拉纤维孔隙的泵送引起的，并且取决于它们的开面积比。这种声音产生的机制类似于湍流边界层的粗糙度噪声机制，即孔隙间距与边界层中的小波长扰动耦合，在和频和差频处产生声辐射。

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Acoustic transmission loss and noise from Kevlar wind tunnel walls

In this paper we will develop a model for the acoustic transmission loss and self-noise generated by a Kevlar wind tunnel wall. It is shown that the porosity of the fabric is the most important controlling factor of the transmission loss, and the effect of wind tunnel flow speed is to increase the losses, as observed in experiments. In addition, a model is developed for the weave noise generated by a Kevlar wind tunnel wall, which is found to be caused by the pumping of the fluid through the pores in the Kevlar and depends on their open area ratio. The mechanism for this sound generation is similar to the roughness noise mechanism for a turbulent boundary layer in that the pore spacing couples with the small wavelength disturbances in the boundary layer to cause acoustic radiation at the sum and difference frequencies.

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来源期刊

International Journal of Aeroacoustics ACOUSTICS-ENGINEERING, AEROSPACE

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Aeroacoustics is a peer-reviewed journal publishing developments in all areas of fundamental and applied aeroacoustics. Fundamental topics include advances in understanding aeroacoustics phenomena; applied topics include all aspects of civil and military aircraft, automobile and high speed train aeroacoustics, and the impact of acoustics on structures. As well as original contributions, state of the art reviews and surveys will be published. Subtopics include, among others, jet mixing noise; screech tones; broadband shock associated noise and methods for suppression; the near-ground acoustic environment of Short Take-Off and Vertical Landing (STOVL) aircraft; weapons bay aeroacoustics, cavity acoustics, closed-loop feedback control of aeroacoustic phenomena; computational aeroacoustics including high fidelity numerical simulations, and analytical acoustics.