为开展剪切变形加筋层合板远场声辐射特性研究，首先基于分层位移模型以及声学波动方程，建立声固耦合运动方程；通过傅离叶变换及泊松公式，得到波数域位移解；结合稳相法，给出单位简谐激振力作用下加筋层合板的远场辐射声压表达式；然后以各向同性结构为例，分别与基于经典层合板理论以及一阶剪切变形理论的计算结果相比，验证该理论模型有效性。最后讨论加强筋、激振位置、材料类型以及铺设角度等参数对加筋复合结构远场辐射声压及其指向性的影响。数值结果表明：激励力作用在强筋上能有效降低结构远场辐射声压，并显著改变声压指向性；角铺设方式有利于降低远场辐射声压级，可通过设计铺设角来进一步优化结构的振动噪声水平。
A theoretical model is developed to investigate vibro-acoustic characteristics of periodically stiffened laminated composite plates, based on the layerwise theory. The layerwise displacement model and convected wave equation are used to account for the exact coupling effect between the acoustic field and laminated panel. By employing the Fourier transform method and the Poisson formulas, the transverse displacements in wavenumber domain is obtained. And then far field pressure expressions are presented from the stationary phase approximation to address the acoustic characteristics of the stiffened laminated plate. The model is validated by comparing with results derived by classic laminated plate theory and the first shear deformable theory for the isotropic plate. Numerical calculations are subsequently carried out to explore the influences of the parameters from stiffening members, the load cases and the lamination sequences on the sound radiation. Several key points can be concluded that the sound radiation can be effectively suppressed and the directivity of sound pressure level is significantly changed when the load is applied on the bulkheads. Ply angle of the lamina has a significant effect on sound radiation and an optimization program is required to minimize the far-field pressures.
2022,44(12): 52-58 收稿日期：2022-03-02
DOI：10.3404/j.issn.1672-7649.2022.12.011
分类号：U661.44
作者简介：冯学营(1985−)，男，硕士，高级工程师，研究方向为海装总体结构设计
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