【作者】 孙磊；

【导师】 李琪；

【作者基本信息】 哈尔滨工程大学 ， 水声工程， 2007， 硕士

【摘要】 潜艇的最大特点就是机动性和隐身性，并由此决定了其在海战中的突袭优势和威慑作用，可见潜艇良好的声隐身性能是保证其战斗力的关键所在。结构的振动和声辐射对潜艇的隐身性有着非常重要的影响，降低潜艇的振动与辐射噪声不仅可以提高自身的隐蔽性，而且还可以增大自身声纳系统的作用距离，从而大大提高其水下对抗能力。因此，对潜艇典型结构的水下单双层结构壳体振动与声辐射的研究有重要的意义。本文在研究结构振动声辐射的理论基础上，讨论了圆柱壳体、圆锥加帽壳体、椭球壳体三组单双层壳体结构在流场中振动声辐射的数值计算方法，并建立了其有限元和边界元分析模型。根据有限元软件ANSYS和边界元软件SYSNOISE的特点，将两者有机结合起来，数值计算研究了三组壳体结构模型的声辐射问题。先利用有限元软件ANSYS计算潜艇结构和外部流体介质的耦合振动，得到耦合振动的节点位移响应值。再利用边界元软件SYSNOISE计算了壳体结构的辐射声功率和辐射效率等声学量。借助这两个软件计算得出壳体在流场中的振动声辐射特性，分析了轻外壳对壳体振动声辐射的影响。本文分析计算了不同形状壳体结构在单点简谐激振力作用下产生的结构振动和声辐射特性。通过比对单双层壳体结构以及改变双壳结构外壳、肋骨厚度情况的振动声辐射特性，综合分析后得出轻外壳对双层壳体结构水下辐射声的影响。本文给出的结论对于潜艇噪声预报，降低潜艇的噪声及其研制和开发有着一定的借鉴意义。更多还原

【Abstract】 The uppermost character of submarine is the flexibility and the stealth, which have decided its advantage of sudden strike and its effects of terrorizing. So that it is the key point of reducing submarine’s acoustic for hiding its body in naval battle to ensure the combat effectiveness. The vibration and the sound radiation from the structure have important effect on the stealth of submarine. Reducing the vibration and the sound radiation of a submarine can not only improve its conceal, but also can enhance its sonar properties, improve its undersea antagonism ability thereby greatly. Therefore, the theoretical research of underwater monolayer or bilayer shell structure is very valuable.Based on the sound-vibration radiation theories, numerical analysis of vibration and sound radiation efficiency about three groups including the cylinder, the cone with cap, the ellipsoid of monolayer and bilayer shell structures in the fluid are disused and the FEM(Finite Element Method) and BEM(Boundary Element Method) analysis models are built. The numerical analyses of vibration and acoustic radiation from the three groups of monolayer and bilayer shell structure models are carried out by using FEM software ANSYS and BEM software SYSNOISE. First, the coupled-vibration of the shell and water is calculated and the normal displacement of the nodes is obtained. Then, by transferring the mesh of the shells and the displacement values on the nodes into software SYSNOISE, the sound pressure, the radiated sound power and the radiant efficiency are carried out by SYSNOISE. By use of the two softwares, the response of the sound and vibration of shells are computed, the influence of the light outer covering to the sound radiation are analyzed.In this dissertation, the characteristics of vibration and acoustic radiation from kinds of shell structures are analyzed. The effect of the light outer covering upon the acoustic radiation of bilayer shell structure is also analyzed by comparing the characteristics of vibration and acoustic radiation from monolayer and bilayer shell structures with conditions of changing the outer covering and ribs’ thickness.The conclusion of the paper can be useful to predict the acoustic radiation of the submarine, reduce its sound pressure, and also for its development and exploitation.更多还原