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基于辐射噪声线谱削峰的双层加肋圆柱壳结构声学设计

Keywords: 双层加肋圆柱壳,振声性能,线谱削峰,阻抗增强,阻波,结构声学设计

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Abstract:

为降低水下航行器辐射噪声线谱,提出了一种弱辐射双层加肋圆柱壳结构.采用机械阻抗理论分析了环肋圆柱壳模态响应幅值控制机理;引入圆截面内运动假设,利用模态展开法推导了环肋径向机械阻抗表达式;基于阻抗失配、波形转换原理,设计了阻抗加强环肋模型,并利用波动理论分析了其隔振性能;考虑壳间托板的强耦合作用,对托板进行了阻波设计.将阻抗增强肋骨和复合阻波托板联合应用到双层壳结构声学设计中,数值分析了设计前后双层壳振动与声辐射性能.结果表明:提出的新型双层加肋圆柱壳能有效实现辐射噪声线谱削峰,振动均方速度、辐射声功率和辐射声压大幅降低,具有显著的减振降噪效果.

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