Undesirable vibrations in offshore platforms due to ocean loadings may reduce platform productivity and increase the fatigue failure. This study proposes a magnetorheological elastomer (MRE) based isolation system to control the jacket platform oscillations and its effectiveness is numerically evaluated. The working principle and design method of MRE-based isolation system are proposed, and MRE materials with high magnetorheological effects are conceptually designed. Practical jacket offshore platforms are selected for case studies. Semi-active fuzzy controller (SFC) is utilized to achieve real-time non-resonance vibration control. The proposed fuzzy core is constructed conceptually by the dynamic analysis of object structure. Numerical results demonstrate that MRE isolation system with SFC significantly reduces the maximum, minimum and RMS of the deck displacement and acceleration under realistic irregular waves at different sea states. MRE system could also reduce the response spectrum peaks and present robustness under various deck's mass. The present study proves the feasibility of MRE isolation systems in the application of vibration control for marine structures.

由于海洋载荷在海上平台中产生的不良振动可能会降低平台生产力并增加疲劳失效。本研究提出了一种基于磁流变弹性体 (MRE) 的隔离系统来控制导管架平台振荡，并对其有效性进行了数值评估。提出了基于MRE的隔离系统的工作原理和设计方法，并对具有高磁流变效应的MRE材料进行了概念设计。案例研究选择了实用的导管架海上平台。利用半主动模糊控制器（SFC）实现实时非共振振动控制。所提出的模糊核心是通过对象结构的动态分析在概念上构建的。数值结果表明，带有 SFC 的 MRE 隔离系统显着降低了最大值，不同海况下真实不规则波浪下甲板位移和加速度的最小值和RMS。MRE 系统还可以减少响应谱峰值，并在各种甲板质量下表现出稳健性。本研究证明了 MRE 隔离系统在海洋结构振动控制应用中的可行性。