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《Journal of Ship Mechanics》 2009-04
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Acoustic stealth design on the underwater sandwich composite shell structure in oblique incidence

ZHU Xi1,LUO Zhong 1,ZHOU Xin2,MEI Zhi-yuan1,LI Hao1(1 College of Naval Architecture and Power,Naval Univ.of Engineering,Wuhan 430033,China;2 Military Representative Office in Shanghai,Naval Dept.of Equip.,Shanghai 200083,China)  
The acoustic models of sandwich composite structure for underwater acoustic stealth was built in planar space.The corresponding transition matrixes,reflection coefficient and absorption coefficient for oblique incidence at free terminal boundary were deduced from the acoustic wave equation.The acoustic frequency response of stealth shell structure in vertical incidence was measured by experiment,the experimental data were matched to the results of transition matrix method,and the influence of different oblique incidence angle was analyzed.The reflection coefficient and absorption coefficient response of shell structure to the thickness,density,loss factors of absorption layer and the thickness of water were calculated,and the acoustic stealth structure of underwater sandwich composite shell was designed.The gradient impedance of acoustic absorbing sandwich layer was designed in certain thickness,and the effects of acoustic stealth were analyzed by numerical method for different material parameter and different geometrical parameter.The results show that the integration of the weighting and acoustic stealth is achieved by utilizing the sandwich composite shell structure.
【Fund】: 国防重点预研基金资助项目
【CateGory Index】: U668
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