舷间液舱模型声振耦合特性及声辐射控制

Sound and vibration coupling characteristic and acoustic radiation control of water cabin

水下航行体内部设备产生的振动能量通过舷间液舱侧板和舱内水介质两个途径的耦合和传递,在外场产生辐射噪声,成为机械噪声控制的一个短板。文中以舷间液舱外场声辐射控制为背景,采用解析方法建立了液舱结构振动与内外声场的声振耦合模型,计算分析了液舱侧板及液舱内部介质对振动传递和外场声辐射的影响,结果认为敷设声学覆盖层并减小液舱侧板材料刚度能够有效控制外场辐射声功率。文章为舷间液舱的"声短路"控制提供了新的思路。

The vibration energy generated by the internal equipment of the underwater vehicle is coupled and transmitted by side panel and internal medium of the water cabin,and generates radiation noise in the external field,which becomes a weakness of ship mechanical noise control.In this paper,an analytical coupled model of sound and structre vibration is established for the challenge of water cabin external acoustic radiation control.Both the internal and external sound field influence is considered.The vibration and acoustic power transmitted by side panel and internal medium is calculated,the influence of both transmitt paths is given.An effective reduction of external acoustic radiation can be achieved by lining acoustic coating and reducing the stiffness of side panel,providing a new idea for the control of acoustic power transmitting through water cabin.