CAJ | 학술논문

采用模态展开法建立了水下有限长双层加筋圆柱壳的振动声辐射模型，给出了环肋、实肋板和舷间水的阻抗表达式，分析了实肋板的周向、轴向、径向及弯矩作用力对双层圆柱壳结构振动声辐射的影响，比较了舷间水与实肋板的传递功率，并针对实肋板详细分析了不同作用力的功率传递特征及主要作用频段。结果表明：0.5倍环频以下，双层壳体间功率传递以舷间水为主，0.5倍环频以上，实肋板对声辐射峰值的贡献更为明显；实肋板功率传递的四个分量中，环频以下以切向力和径向力传递为主，环频以上四个分量传递功率量级基本相当，轴向力略低。
채용모태전개법건립료수하유한장쌍층가근원주각적진동성복사모형，급출료배륵、실륵판화현간수적조항표체식，분석료실륵판적주향、축향、경향급만구작용력대쌍층원주각결구진동성복사적영향，비교료현간수여실륵판적전체공솔，병침대실륵판상세분석료불동작용력적공솔전체특정급주요작용빈단。결과표명：0.5배배빈이하，쌍층각체간공솔전체이현간수위주，0.5배배빈이상，실륵판대성복사봉치적공헌경위명현；실륵판공솔전체적사개분량중，배빈이하이절향력화경향력전체위주，배빈이상사개분량전체공솔량급기본상당，축향력략저。
An analytical model describing the under-water vibration and sound radiation of stiffened finite cylindrical double shell is established by means of modal expansion method. The impedance of ring stiffen-ers, connected annular plates and medial water between inner and outside circumferential cylindrical shell is considered. The influence of circumferential force, axial force, radical force and axial bending moment of connected annular plates on vibration and sound radiation is studied, and the sound power transferring by connected plate and medial water is also compared, furthermore, the transmitted power from inner shell to outside shell by circumferential force, axial force, radical force and axial bending moment of connected plate is analyzed in detail. The results show that the transmitted sound power is dominated by medial water be-tween shells below the half ring frequency, while above the half ring frequency, the resonant peak of sound power is attributed to annular plates. Among the 4 types of forces and moment, the radial and circumferen-tial force transmit the main part of the power below the ring frequency, while the 4 types of force just share the power above the ring frequency except for the axial force.