Abstract
The JZ20-2NW offshore platform located in Bohai Gulf of China is the first offshore platform structure incorporating MR dampers in the world. The isolation layer consisting of rubber bearings and MR dampers was installed between the platform deck and supporting jacket to reduce the vibration caused by sea ice in winter as well as earthquake. For the semi-active control of MR dampers, the Kalman filter was used to estimate the system state of the platform structure based on the measurements of main deck acceleration and isolation layer deformation. Although the accuracy of the state estimation without any information of external force is not as good as that with the knowledge of its mean value in the case of ice excitation, this has little influence on the control effects. The real-time hybrid test (RHT) method was employed to investigate the dynamic performance of the platform. The results of RHTs show that the ice- and earthquake-induced vibrations can be effectively suppressed by the isolation layer with MR dampers. Copyright © 2010 John Wiley & Sons, Ltd.
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