The numerical method was adopted to study the sound radiation pressure of an infinitely long cylinder , and the a-chieved results agree well with analytic solutions .Based on the acoustic infinite element method , the stiffened cylindrical shell's vibration and far-field underwater noise characteristics was studied , and the effects of the outer shell and inner shell thickness , plate thickness, profile dimension on the surface of the shell vibration mean-square acceleration level and the far field sound pres-sure level of radiation were discussed .The results showed that the vibration of outer-shell thickness has greatest influence on the shell acceleration mean square parameter on the surface level and the far field radiation sound pressure level .%以无限长圆柱壳体为研究对象，基于声学无限元法利用数值计算方法对其结构外声场进行分析，对加筋圆柱壳的振动和远场水下噪声特性进行研究，讨论外壳厚度、内壳厚度、托板厚度、型材尺寸等结构参数对壳体表面振动均方加速度级及远场辐射声压级的影响。结果表明：改变外壳厚度参数对其表面振动均方加速度级及远场辐射声压级影响最大。
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