激励位置对加肋圆柱壳振声特性影响研究

水下结构内部设备从不同位置作用于壳体结构,会对结构的振声特性产生影响,研究激励位置对结构振声特性的影响规律,有助于内部设备的优化布置。为此,基于有限长加肋圆柱壳结构的近似解析解,导出点激励和线激励在不同位置、不同角度的振动和辐射噪声的近似解析解,研究激励位置对其的影响规律。结果表明:激励力向圆柱壳的边界靠近时,结构的辐射声功率和均方速度都会显著降低;对称力作用在适当的角度时可以有效的降低结构的均方速度;与点激励相比,线激励可以明显降低圆柱壳结构辐射声功率和均方法向速度,作用范围越长,减振降噪的效果越好。研究结果可为水下结构内部设备的布置和安装提供一定的指导意义。

Influence of driving force location on vibro-acoustic characteristics of stiffened cylindrical shells

The internal equipment of the underwater structure acts on the shell structure from different positions,which will affect the vibrating characteristics of the structure.Therefore,studying the influence of the excitation position on the vibrating characteristics of the structure contributes to the optimal arrangement of the internal equipment.Based on the approximate analytical solution of ribbed cylindrical shell structure,the approximate analytical solutions of the vibration and radiation noise of point excitation and line excitation at different positions and different angles are derived,and the influence of the excitation position is studied.The results show that when the point force approaches the boundary of the cylindrical shell,the radiated sound power and the mean square velocity of the structure will be significantly reduced.When the symmetrical force acts at a proper angle,the structure can be effectively reduced mean square velocity;Compared with point excitation,line excitation can significantly reduce the radiated sound power and the uniform method velocity of the cylindrical shell structure,and the longer the incentive ranged,the better the effect of vibration reduction and noise reduced.The results can provide some guiding significance for the layout and installation of underwater structure equipment.