圆柱及其组合体水动力与涡激振动计算

本文对圆柱及其组合体在海洋中运动所受定常阻力、振动附加阻力、波激力和涡激力等给出了经验公式，特别对于组合体涡激共振情况，给出了振幅估算方法。根据文中公式和计算方法，对一水下装置进行了自由振动、涡激振动和各种流体作用力与结构应力的计算，发现该装置可能在1．5m／s的低速发生强烈的涡激振动，导致装置疲劳损坏或不能正常使用，而高速下流体阻力和波浪力则是结构破坏的主要原因。

Hydrodynamic forces and vortex-induced vibration calculation for a cylinder and its combination

This paper presents the empirical formulations for steady drag, additional drag due to vibration , wave-excited force and vortex-excited force acting on a cylinder or its combination; particularly for the case of vortex-induced vibration of the combination, the vibrational amplitude is assessed. According to the formulations, for a given combination set the calculation of the vortex-induced vibration, the applied fluid forces and structural stresses are carried out. It is found that strong vortex-excit ed resonance could occur at a speed of 1. 5m/s, which would lead to fatigue damage or unsafe use, while at higher speed, flow resistance and wave -excited force would become the main cause of structural damage.