【摘要】 通过在海洋平台顶部安装主动调谐质量阻尼器(AMD),研究了平台在冰荷载作用下的主导模态H∞控制.首先采用H∞方法与模态空间的平衡降阶法进行控制设计,然后基于虚拟激励法得到了系统冰致振动的解答,并应用此解答进行了广泛的参数研究,确定了平台减振效果最佳时的H∞控制器最优参数.通过该应用特例,以评价H∞控制器的有效性.结果表明如果H∞控制器的参数选择合适,则可以显著减小平台的冰致振动响应.更多还原

【Abstract】 H∞ control of the critical modes of vibration of an offshore platform under ice loads was studied.The control was applied to a platform via an active tuned mass damper (AMD) located at the top of the platform. An algorithm combining the H∞ method together with balanced reduction scheme in modal space was used for control design. The solution for ice-induced vibration response of the system was derived in terms of pseudo-excitation method. With the derived solution, extensive parametric studies can be carried out. The optimal parameters of H∞ controllers for achieving the maximum vibration response reduction of the platform can be identified. The effectiveness of H∞ controllers for this particular application is evaluated.The results show that the ice-induced vibration response of the platform can be considerably reduced if the parameters of H∞ controllers are selected appropriately.更多还原