海洋平台磁流变阻尼器半主动控制技术研究-港口、海岸及近海工程专业论文.docxVIP

摘要海洋平台磁流变阻尼器半主动控制技术研究 摘要 海洋平台磁流变阻尼器半主动控制技术研究 摘 要 本文在总结了国内外对海洋平台振动控制研究现状的基础上，研究了在 随机波浪荷载作用下采用磁流变(MR)阻尼器对海洋平台进行半主动振动控 制的可行性和有效性，内容包括： 夺对随机波浪谱和随机波浪力进行了数值模拟，采用白噪声过程通过 滤波器来近似随机波浪力谱。 夺建立了MR阻尼器的力学模型，采用多项式拟合得到磁场强度与屈 服应力的关系曲线，对MR阻尼器进行了参数设计。 夺建立海洋平台MR半主动控制系统的数学模型，提出了基于现代最 优控制理论的半主动控制策略。 夺以某典型的固定式导管架平台为算例，编制了相应的计算程序，数 值分析了海洋平台MR半主动控制系统的振动响应，比较了在MR 被动控制和MR半主动控制下的平台减振效果 仿真结果表明，采用MR阻尼器对海洋平台进行被动控制和半主动控制 都是实现对海洋平台振动控制的有效手段，基于两种主动控制算法所提出半 主动控制律是非常有效的。 (综上所述，MR阻尼控制装置具有体积小、能耗低、可连续调节等优点， 是对海洋平台结构实施半主动控制的理想控制装置。∥ 关键词： 磁流变阻尼器：海洋平台：半主动控制：半主动控制律 Studi Studi es on Semi—Active Vi bratjon Oont r0 J of Offshore P l atforms by MR Dampe r Abst ract This paper focus on the feasibility and the effectiveness of semi—active control for offshore platforms by magneto—rheological(MR)damper under wave loading based on the present situation ofthe vibration contr01 for offshore platforms． 夺Wjve force and its spectrum form are numerically simulated．In this paper an analog filter used to approximately represent the wave force spectrum in order to satisry the random optimal control conditions， 夺The mechanical model of MR damper is established In this paper a polynomial used to approximately the magnetic field intensity—yield stress curve．The parameters of MR damper are designed． 夺The mathematical model of the MR semi．active control for the vibration of offshore platformS and the semi．active control algorithm are established based on the theory of modem optimal contr01． 夺A numerical example is presented to illustrate the developed design procedure． By numerical studies．the contr01 efficiency iS compared between the MR passive control and the MR semi-active contr01．Summarized advantage and characteristic of stmctural magneto．rheological semi—active vibration control for offsbore platforms． The study show that MR passive controI and MR semi—active control are all efficient methods to suppress the vibration of offshore platforms．The results illustrate that the semi．active control strategy based on two methods o