Experimental Study on Underwater Acoustical Properties of Sound Absorption Structure of Light Sandwich Composite
LI Hao; MEI Zhi-yuan;ZHU Xi
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College of Naval Architecture and Power, Naval Univ. of Engineering, Hubei Wuhan 430033, China
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History+
Received
Revised
Published
2009-12-15
2010-04-19
2011-04-25
Issue Date
2011-04-25
Abstract
Abstract: Sound absorption structure of sandwich composite had been extensively applied because it was designable. In this paper, in order to solving this problem that the density of sound absorption core material of previous sandwich composite structure was larger, a kind of sound absorption structure of light sandwich composite was designed. The surface material of this structure is GFRP, and the core material is polymer sound absorption material synthesized from a variety of hollow glass microsphere, epoxy resin and polyurethane- modified epoxy resin. The thickness of surface GERP material was study and determined. The underwater acoustical properties of specimen were measured in the sound pulse tube. The synthetic formula of core material was determined based the test results of pulse tube specimen. The sample was prepared for anechoic tank test. The sound reflection coefficient and sound absorption coefficient of this sample was measured in the anechoic tank. Then, the sound absorption mechanism of sound absorption structure of sandwich composite was analyzed. The research results showed that polymer sound absorption material synthesized from a variety of hollow glass microsphere, epoxy resin and polyurethane-modified epoxy resin has a low density(relative density 0.8±0.05). Sound absorption structure of sandwich composite has an excellent underwater sound absorption property using this core material. This light sandwich structure must be more conducive to engineering applications because of its low density and excellent sound stealth properties.
LI Hao;MEI Zhi-yuan;ZHU Xi.
Experimental Study on Underwater Acoustical Properties of Sound Absorption Structure of Light Sandwich Composite[J]. Journal of Vibration and Shock, 2011, 30(4): 51-54
