NDLI: The absorption characteristics of anechoic coating embedding mixed-cavity structure with single or double shell backing

Content Provider	IEEE Xplore Digital Library
Author	Chao Shang Ying-jie Wei Jia-zhong Zhang
Copyright Year	2010
Description	Author affiliation: School of Astronautics, Harbin Institute of Technology, 150001, China (Chao Shang; Ying-jie Wei; Jia-zhong Zhang)
Abstract	Rubber sheets embedding air cavities are wide used as anechoic coatings to reduce the energy of sound waves reflected by underwater structures, with a great military and use benefit to underwater vehicle sound stealth. According to the backing type, it can be divided into two kinds, namely rubber sheets-steel-air and rubber sheets-steel-water-steel-air, called the single and double shell backing coatings respectively. The most remarkable absorption characteristics of double shell backing coating is that its sound reflection coefficient frequency response curve increased on a series of sharp formants maxima, correspondingly, absorption coefficient curve appear a series of sharp minimum. This phenomenon is caused by the standing wave resonant which is formed in water interlayer between the double shells. Based on the finite element method, a non-rotating symmetrical numerical simulation model of coating embedding mixed-cavity, four small cavities around a big cavity, is established. Absorption characteristics of coating with single and double shell backing were studied. The results show that the sound absorption characteristics of mixed-cavity structure are significantly better than single-cavity structure's under the condition of same perforation rate. The absorption coefficient peak can be improved 0.2.
Starting Page	497
Ending Page	500
File Size	279107
Page Count	4
File Format	PDF
ISBN	9781424498222
e-ISBN	9781424498215
DOI	10.1109/SPAWDA.2010.5744363
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-12-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Double shell mixed-cavity Absorption finite element method anechoic coating Cavity resonators Coatings Finite element methods System-on-a-chip Rubber Periodic structures
Content Type	Text
Resource Type	Article

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