摘要海洋平台的振动控制是一个复杂和综合的问题。为了抑制海洋平台振动,本文提出了基于AMD（主动质量阻尼器）的最优反馈和最优前馈反馈控制方法并且研究了控制律中最合适参数的选取问题。首先利用随机波浪理论分析和计算海洋波浪力，以此建立一个动态外系统。随后对海洋平台系统建模并提出最优反馈和最优前馈反馈两种控制律。给出一个数值实例且利用Matlab软件对其最优控制效果进行了仿真。最后研究了实际应用时随参数变化控制效果和能量消耗的关系并且提出了如何在不同海洋环境下选取合适的参数。仿真结果表明,提出的最优控制律是有效的并且其中最优前馈反馈控制律控制效果更好。同时通过仿真结果，分析了该数值实例在不同风浪下选择参数的安全性和经济性。66788

毕业论文关键词  海洋平台  最优控制  Matlab仿真  参数选取

毕业设计说明书（论文）外文摘要

Title  Optimal Vibration Control For Offshore Platforms                                    

Abstract

Vibration control for offshore platforms is a complicated and synthetical problem. This paper focuses on the design of feedback optimal control law and feedforward and feedback optimal control law to suppress vibration of offshore platforms. Also, this paper points out how to choose the most appropriate parameter in the input channel to achieve better system performance. Firstly, based on irregular wave theory, the irregular wave force is formulated by an exosystem, which refers to an external system of the offshore platform. Secondly, the way to model offshore structures is summarized as a functional differential equation. Based on the functional differential equation, feedback control law and feedforward and feedback control law are proposed, respectively. Thirdly, a numerical example for jacket-type offshore platform is simulated by using Matlab software. Finally, by adjusting a free parameter in optimal control law, the relationship between performance of control and energy consumption is investigated and how to assign the adjustable parameter is also developed under different wave environments. The numerical example shows that the proposed optimal control laws are feasible and effective (especially the feedforward and feedback optimal law). Perfecting the balance between safety and economy of the controller design under different wave situations can be achieved by choosing appropriate parameters in the optimal control laws.

Keywords:  Offshore Platforms   Optimal Control   Matlab Simulation  parameter choosing

目  次

说明A:标准数学符号 1

说明B:缩写词含义 2

说明C:全文图表 3

1  绪论 4

1.1  研究背景 4

1.2  国内外发展现状 4

1.2.1  海洋波浪力研究理论成果 4

1.2.2  作用在海洋建筑和平台上的波浪力 4

1.2.3  海洋平台振动控制的主要方法 5

1.2.4  最优控制以及在海洋平台中的应用 6

1.3  本论文设计任务及要求 7

1.3.1  设计任务 7

1.3.2  设计要求 7

1.4  论文结构