地震载荷作用下海洋平台振动控制仿真研究

分别以海洋平台的前三阶固有频率作为被控频率，振动控制系统的参数在最优参数区间内取值，应用ANSYS有限元分析软件，对海洋平台在三维地震载荷作用下的振动控制进行仿真研究。结果表明，地震载荷作用下，振动控制系统具有明显的减振效果，减振率都在60％以上。控制平台的第一阶固有频率可以得到很好的振动控制效果。同时控制平台的前二、三阶固有频率，振动控制效果存Y和Z方向有所提高，分别为10％和20％左右。

Simulation of Vibration Control of Offshore Platforms Under Earthquake Loadings

The simulation of vibration control of offshore platforms under earthquake loadings was performed by using the ANSYS, in which the first 3 order natural frequencies of the platform were controlled by the ETMD system where the parameters of the system were taken in the optimal regions. The results showed that the ETMD system can reduce the vibration of the platform effectively under earthquake loadings. Another important conclusion was that reasonable control effects can be obtained by control the first order natural frequency. The control effects increase 10% and 20% in Y and Z directions when the first two and three order natural frequencies are controlled simuhaneously.