固定式导管架平台的H_2振动控制技术研究

Studies on H_2 Vibration Control Strategy for Offshore Jacket Platforms

基于H2控制原理,研究了在无法获得海洋平台精确数学模型时仍能实施有效控制的振动控制技术。通过采用一滤波器来近似随机波浪力的设计方法,解决了将H2控制原理应用于海洋平台振动控制中非高斯白噪声的输入问题。此外,为了更清晰地描述海洋平台所具有的不确定性,在建立其数学模型时,将模拟随机波浪力的噪声与模型噪声分开表示。以一典型的固定式导管架平台为数值算例,研究了该控制方法对固定式导管架平台振动的控制效果,并对系统的不确定性进行了敏感性分析。仿真结果表明,该控制方法对固定式导管架平台在随机波浪荷载作用下出现超大振动的控制是有效的,并具有一定的鲁棒性能。

Base on H2control theory, a vibration control strategy for jacket platforms is studied in this paper, which is effective even in the case of accurate numerical model of platform being not available. By adopting an analog filter to approximately represent the wave force spectrum, this paper deals with no-Gaussi n-white noise input problem, when H2 control strategy is applied to control the vibration of offshore platform. In addition, in order to describe more clearly the model uncertainty of offshore platform, noise terms for generating filtered wave load and accounting for model uncertainty are separated in the present study. A numerical example applied to a typical jacket platform is presented to investigate the control effect and study sensitivity of system uncertainties. The results demonstrate that H2 control method is very effective for controlling the vibration of offshore jacket platform, and also robust.