Experiments and analyses of ice-induced vibration control of offshore jacket platform structure
This paper proposes a semi-active control system to reduce ice-induced motions in the offshore jacket platform structure subjected to ice-induced vibration. Magnetorheological (MR) dampers are applied as semi-active control devices and the control input determination is based on a clipped-optimal control algorithm which uses absolute displacement and acceleration feedback. The performance of this method is studied experimentally by means of an offshore jacket platform model. The damping isolation layer with rubber supports and MR dampers is designed for 1:10 scale model of JZ20-2MUQ platform structure. Ice-induced vibration control tests have been performed on three models,i.e. The original structure, the structure with rubber bearings and the structure with rubber bearings and MRdampers using one in-situ bending ice and one in-situ compression ice loads. The MR damping control schemes include Passive On, Passive Off and Semi-active controls. The experimental results indicate that both the pure isolation and MR damping isolation schemes can significantly reduce the response ofdisplacement of the jacket cap and the acceleration of the deck. The MR semi-active control is better than other two passive controls. The experimental structural responses have been compared with the predictions of numerical analysis as well.
Jigang Zhang Bin Wu Jinping Ou S. Gao
School of Civil Engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong, 26 School of Civil Engineering,Harbin Institute of Technology,202 Haihe Road,Harbin,Heilongjiang,150090 School of Civil & Hydraulic Engineering,Dalian University of Technology,Dalian,116024,China School of Civil Engineering,Qingdao University of Technology,Fushun Road 11,Qingdao,Shandong,266033,
国际会议
第六届国际振动工程会议(The 6th International Conference on Vibration Engineering)(ICVE’ 2008)
大连
英文
2008-06-04（万方平台首次上网日期，不代表论文的发表时间）