静水压力对水下环肋圆柱壳输入功率流的影响(英文)

Effect of Hydrostatic Pressure on Input Power Flow in Submerged Ring-stiffened Cylindrical Shells

研究了考虑静水压力时水下环肋圆柱壳在周向余弦线分布力激励下的输入功率流特性。圆柱壳体和外流场的振动分别由Flügge壳体方程和Helmholtz波动方程描述,静水压力的影响以额外应力的形式计入壳体振动方程当中。探讨了静水压力对输入功率流的影响。结果表明外部静水压力使输入功率流曲线沿频率轴往左移动,即往低频方向移动。静水压力越大,影响越大;周向模态数越大,影响越大。文中结果对水下环肋圆柱壳的振动与噪声控制有一定的指导意义。

The input power flow for an infinite ring-stiffened cylindrical shell submerged in fluid induced by a cosine harmonic circumferential line force under conditions of a uniform external hydrostatic pressure field is investigated in this paper.The motion of the shell and the pressure field of the external fluid are described by the Flügge＇s thin shell theory and the Helmholtz equation respectively.The effect of the external pressure field is modeled by including static prestress terms in the shell equations of motion.The effects of hydrostatic pressure on the input power flow are examined.The results show that the external pressure shifts the curves of input power flow to left along the frequency axis.The effect is more obvious with higher external pressure and circumferential mode.It will give some guidelines for vibration and noise control of this kind of shell.