降噪系数
阀体孔板
材料科学
声学
衰减系数
噪音(视频)
吸收(声学)
声阻抗
光学
复合材料
物理
工程类
多孔性
机械工程
计算机科学
图像(数学)
人工智能
超声波传感器
作者
Hiromitsu HAMAKAWA,Hayato KOCHYO,Souma ISHIKAWA,Hiroki HARADA,Eru Kurihara
出处
期刊:Nenji Taikai
[The Japan Society of Mechanical Engineers]
日期:2021-01-01
卷期号:2021: S091-01
标识
DOI:10.1299/jsmemecj.2021.s091-01
摘要
Noise pollution is one of the problems associated with factory noise because of its harmful impact on human health and well-being. Noise is a factor in sustainability that must be considered. The present paper focuses on effect of tapered orifices on acoustic absorption performance of perforated plate with background air space. The taper angle was 60 degree. We experimentally measured the flow rate, acoustic pressure, and transfer function using the improved acoustic impedance tube. The normal incidence absorption coefficient was calculated from the measured transfer function using transfer function methods. As the bias flow velocity passing through the orifices increased, the peak level of the acoustic absorption coefficient increased. The acoustic absorption performance has improved using taper orifices of perforated plate. The peak frequency of the acoustic absorption coefficient depended on the cross-sectional shape of hole of perforated plate.
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