Prediction of acoustic absorption performance of a perforated plate with air jets
| Autor: | Hiromitsu Hamakawa, Yuta Asai, Hidechito Hayashi, Masanori Miyazaki, Eiichi Nishida, Eru Kurihara |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Aperture Acoustics Internal pressure 02 engineering and technology Condensed Matter Physics behavioral disciplines and activities 01 natural sciences Transfer function Volumetric flow rate 020303 mechanical engineering & transports 0203 mechanical engineering Flow velocity Attenuation coefficient 0103 physical sciences otorhinolaryngologic diseases sense organs Sound pressure Acoustic impedance 010301 acoustics psychological phenomena and processes |
| Zdroj: | Journal of Thermal Science. 26:378-384 |
| ISSN: | 1993-033X 1003-2169 |
| DOI: | 10.1007/s11630-017-0952-5 |
| Popis: | The present study focuses on the prediction of acoustic absorption performance of a perforated plate with air jets by theoretical calculations. In addition, we experimentally measured the flow rate, internal pressure, acoustic pressure, and transfer function using an acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. We investigated the influences of background air space, flow velocity, thickness, aperture rate, and aperture diameter of a perforated plate on the acoustic absorption characteristics. The frequency characteristics of the acoustic absorption coefficient showed a maximum value at a local frequency. As the background air space increased, the peak frequency of acoustic absorption characteristics decreased. As the flow velocity passing through the apertures increased, the peak level of the acoustic absorption coefficient also increased. The theoretical results agreed well with the experimental ones qualitatively. |
| Databáze: | OpenAIRE |
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