Application of sound-absorbent plastic to weak-shock-wave attenuators
作者:
Katsuhisa Ootsuta,
Kei Matsuoka,
Akihiro Sasoh,
Kazuyoshi Takayama,
期刊:
Review of Scientific Instruments
(AIP Available online 1998)
卷期:
Volume 69,
issue 4
页码: 1724-1729
ISSN:0034-6748
年代: 1998
DOI:10.1063/1.1148832
出版商: AIP
数据来源: AIP
摘要:
A device for attenuating weak shock waves propagating in a duct has been developed utilizing sound-absorbent plastic which is usually used for attenuating sound waves. The device has a tube made of the sound-absorbent plastic installed coaxially to a surrounding metal tube with a clearance between them. The clearance acts as an air layer to enhance the performance of the shock wave attenuation. When a weak shock wave propagates through this device, the pressure gradient of the shock wave is gradually smeared and hence its overpressure is decreased. The performance of the device was examined using a1/250-scaled train tunnel simulator which simulated the discharge of weak shock waves created by high-speed entry of trains to tunnels. The overpressure of the shock waves ranged up to 5 kPa. The shock wave overpressure was decreased by 90&percent; with the present attenuator attached. This device can be applied to various industrial noise suppressions which are associated with unsteady compressible flows. ©1998 American Institute of Physics.
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