内部声源激励加筋双层圆柱壳声振计算方法

Calculation of vibration and sound radiation from double stiffened cylindrical shells excited by interior source

提出了一种计算内部声源激励下水下加筋双层圆柱壳声振的方法.由Flügge薄壳理论、内部声腔声压满足有源波动方程、外流场声压满足无源波动方程,建立耦合运动方程,利用内、外流固交界面连续条件,采用模态叠加法求解方程.数值计算比较了在点力与内部点声源激励下单、双层圆柱壳的振动和声辐射性能,研究结果表明:不论是点力激励还是点声源激励,双层圆柱壳对振动和声辐射均有屏蔽作用;点力激励下的能量传递损失较点声源激励下的小.

A method to calculate the sound radiation from stiffened cylindrical shells excited by interior source was given. A coupling equation was presented for evaluating the vibration and sound radiation characteristics of a submerged stiffened double cylindrical shell excited by harmonious airborne sound pressure, based on Flugge shell theory, Helmholtz equation and continuous boundary condition on fluid-structure interface. The coupling equation was solved by mode superposition. The comparisons of underwater sound radiation properties of single cylindrical shell and double cylindrical shell by exciting force and sound source are carried out by calculation and analysis. Some conclusions were ob rained： compared with single shell, the double shell has shield action on vibration and sound radiation no matter what the shell is excited by forces or sources. The transfer loss of energy of the shell excited by force is bigger than excited by source.