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http://dx.doi.org/10.3795/KSME-B.2003.27.3.294

Radiated Sound from Compliant and Viscoelastic Plates in a Turbulent Boundary Layer  

Lee, Chang-Jun (인하대학교 대학원 기계공학과)
Lee, Seung-Bae (인하대학교 기계공학과)
Kwon, O-Sup (인하대학교 대학원 기계공학과)
Jun, Woo-Pyung (서울대학교 난류제어연구단)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.3, 2003 , pp. 294-301 More about this Journal
Abstract
We examine a problem in which porous/viscoelastic compliant thin plates are subject to pressure fluctuations under transitional or turbulent boundary layer. Measurements are presented of the frequency spectra of the near-field pressure and radiated sound by compliant surface. A porous plate consisting of 5mm thick. open-cell foam with fabric covering and a viscoelastic-painted plate of 1mm thick over an acoustic board of 4mm thick were placed over a rigid surface in an anechoic wind tunnel. Streamwise velocity and wall pressure measurements were shown to highly attenuate the convective wall pressure energy when the convective wavenumber (k$_{c}$h) was 3.0 or more. The sound source localization on the compliant walls is applied to the measurement of radiated sound by using an acoustic mirror system.
Keywords
Compliant Surface; Turbulent Boundary Layer; Radiated Sound; Wall Pressure Spectrum;
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Times Cited By KSCI : 3  (Citation Analysis)
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