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Acoustic scattering from submerged laminated composite cylindrical shells

机译：浸入式叠层复合圆柱壳的声散射

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The scattering of an oblique plane progressive monochromatic acoustic field upon a laminated composite cylindrical shell is studied based, on the three-dimensional exact equations of anisotropic elasticity. Each layer of laminated structure is made of helically filament wound (fiber reinforced) homogeneous material whose degree of anisotropy is considered as monoclinic type. An approximate laminate model along with the local transfer matrix solution is used to solve the state space governing formulation within each layer. Considering the perfect bonding between the adjacent layers, the global transfer matrix is constructed as the product of the local transfer matrices employed to solve for the unknown scattering coefficients. The so-called back-scattered form function amplitude is evaluated for two cases of (strong anisotropy) Graphite/Epoxy and (weak anisotropy) Glass/Epoxy multilayered cylindrical shells, for different number of layers and different stacking sequence. Furthermore, the axisymmetric and non-axisymmetric dynamic behavior of the composite shells are studied by evaluating the directivity patterns of the far-field form function amplitude at the selected resonance frequency corresponding to the first overtone of n = 2 vibration mode. Some limiting cases are considered and good agreements with the solutions available in the literature are obtained. (C) 2015 Elsevier Ltd. All rights reserved.
机译：基于各向异性弹性的三维精确方程，研究了层状复合圆柱壳上倾斜平面渐进单色声场的散射。层压结构的每一层均由螺旋状缠绕（纤维增强）的均质材料制成，其各向异性程度被视为单斜晶型。近似的层压板模型与局部传递矩阵解一起用于求解控制每一层内状态空间的配方。考虑到相邻层之间的完美结合，将全局传递矩阵构造为用于求解未知散射系数的局部传递矩阵的乘积。对于两种不同的（强各向异性）石墨/环氧树脂和（弱各向异性）玻璃/环氧树脂多层圆柱壳，针对不同的层数和不同的堆叠顺序，对所谓的反向散射形函数振幅进行了评估。此外，通过在与n = 2振动模式的第一个泛音相对应的选定共振频率下评估远场形式函数振幅的方向性图，研究了复合壳的轴对称和非轴对称动力学行为。考虑了一些限制情况，并获得了与文献中可用的解决方案的良好协议。 （C）2015 Elsevier Ltd.保留所有权利。

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