层间流体和肋骨对双层壳体辐射声场作用分析

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1、哈尔滨工程大学硕士学位论文摘要结构流固耦合辐射声场问题涉及多个学科，长期以来一直是结构声分析和控制领域的前沿性问题。双层圆柱壳体是工程领域中普遍应用的基本构件，研究此类壳体结构水下声—振特性，对工程结构的噪声控制和优化设计等都具有重要的理论价值和现实意义。水中弹性结构声一振特性分析的数值方法具有适应各种复杂模型的优点。本文利用有限元加边界元方法计算了两端带固定障板的双层带肋圆柱壳体模型的声—振特性参数。通过分类对比各工况模型声—振参数的特征，得到了该模型受激水下声—振特性随内壳厚度、肋厚度、壳间介质是否连续、肋的数量等因素变化的规律。其中壳间充

2、水有肋、壳问充水无肋、壳间水层有空气层且有肋三种工况的振动与声辐射特性表明：低频范围内模型主要是通过壳间水层传递能量的；随着频率的增加，肋的能量传递作用增强。减振降噪在低频时是比较困难的。本文的研究结果表明在低频时只要把水的传递能量作用抑制就能有效地降低结构的辐射噪声。本文对今后工程中具有类似壳体结构的设备或部件的低噪声优化设计以及噪声控制提供一定的理论依据。关键词：有限元；边界元：双层圆柱壳；声辐射哈尔滨工程大学硕士学位论文ABSTRACTTheproblemofsoundradiationfromshellsoffluid-structur

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