敷去耦层有限加筋板声辐射近似解析解

本文主要研究了流体负载下敷设去耦阻尼层的加筋板，在外界激励力作用下的振动和声辐射，推导出了敷设去耦层有限长加筋板的振动响应和水下辐射噪声近似解析解。采用弹性理论来描述去耦层，并采用模态迭加理论构造响应函数，将加强筋等效为线力的作用，以复模量形式计及去耦阻尼层损耗因子，建立了敷设去耦阻尼层加筋板的理论解析模型，结合加筋板与去耦层变形连续条件、结构与流体连续性条件组成了声-流体-结构的耦合方程，结合数值计算方法，得到了有限长加筋板结构的振动位移及水下辐射噪声。开展相应数值算例与模型试验结果吻合较好，验证本文方法的正确性。

APPROXIMATE ANALYTIC SOLUTION OF SOUND RADIATION FROM STIFFENED FINITE PLATE COATED WITH DECOUPLING LAYERS

the vibration and sound radiation of finite stiffened plate coated with decoupling layers in semi-infinite water was investigated in this paper. And Approximate analytic solution of the vibration and sound radiation of stiffened plate coated with decoupling layers were derived. Using of elasticity theory to describe the decoupling layer, response function was constructed by mode superposition theory, the material loss factor was considered by the form of complex modulus, the effects of stiffeners was treated as reverse forces, analytic model of stiffened plate with decoupling layer treatment was obtained. Using deformation harmonious conditions of the interface between stiffened plate and decoupling layer and continuity conditions of surface of fluid-structure，the vibration equation coupled by sound-fluid-structure was composed. Combined with numerical methods, the vibration and sound radiation of stiffened plate were received. Carrying out the corresponding numerical results agree well with model test results to verify the correctness of this method.