结构型式对双层壳声辐射特性影响研究

基于有限元及边界元法，运用有限元计算软件ANSYS和声学软件SYSNOISE，通过对圆柱壳体结构形式（耐压壳板的厚度、肋骨的布置）的改变，分析了结构形式对水下结构辐射噪声的影响，找到了结构型式改变对其结构辐射噪声的影响规律。同时研究了圆柱壳不圆度对结构振动和声辐射的影响，结果表明圆柱壳不圆度的存在，一定程度上加强了水下结构的振动，且壳体截面的不圆度越大，结构的辐射声功率越大。这对降低水下航行体的噪声具有重要研究价值。

Effect of Structure Types on Underwater Sound Radiation from Double Cylindrical Shell

The different structure types of double cylindrical shell, i.e. variable thickness of pressure hull plate and frame configuration, were studied to analyze the effects of structure types on the sound radiation by applying ANSYS and SYSNOISE software based on the finite element and boundary element methods. The effects relating to variable structure types on the sound radiation were observed, the non-circularity of double cylindrical shell was also investigated on vibration and sound radiation from underwater structure. It is found that the non-circularity of double cylindrical shell may intensify the vibration of underwater structure, and that the non-circularity of shell section is bigger the radiation sound power is greater. This implies an important value for noise reduction of underwater vehicles.