固定式海洋平台系统的网络化模糊减振控制方法

Network-based fuzzy damping control for offshore platform systems

目的:研究受非线性自激波浪力影响下的海洋平台网络化模糊系统建模和控制问题。方法:针对一类含有主动质量阻尼器的导管架海洋平台,采用Takagi-Sugeno(T-S)模糊方法模糊化平台振动模态固有频率建立海洋平台系统的模糊动力学模型;然后,通过构造Lyapunov-Krasovskii泛函并采用积分不等式方法研究海洋平台闭环系统的稳定性条件。结果:给出了海洋平台系统在网络控制环境下的T-S模糊动力学模型以及闭环系统渐近稳定的充分条件,从而提出了海洋平台网络化模糊控制器的设计方法。结论:仿真结果表明,本文提出的网络化模糊控制方法能够有效地降低平台的振动幅值,提高平台的安全性。

Aims:This paper deals with the network-based fuzzy damping control problem for offshore platforms subject to the nonlinear self-excited wave force.Methods:Firstly,we established a fuzzy dynamic model of the platform system with an active tuned mass damper mechanism after fuzzifying natural frequencies of the offshore platform by using Takagi-Sugeno(T-S)fuzzy schemes.Then,a Lyapunov-Krasovskii functional approach and an integral inequality method were used to analyze the stability of the closed-loop system.Results:A networked T-S fuzzy model was provided for the offshore platform;and a sufficient condition of the asymptotic stability of the closed-loop system was derived.A networked fuzzy controller design method was presented for the jacket platform.Conclusions:Simulation results show that the designed network-based fuzzy controller can effectively reduce the vibration amplitudes of the offshore platform and thereby improve the security of the platform.