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船舶航向跟踪系统自适应滤波反步终端滑模控制

DOI: 10.15918/j.tbit1001-0645.2015.02.014

Keywords: 船舶航向跟踪 自适应 滤波反步法 终端滑模 模糊系统

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Abstract:

针对船舶航向非线性系统,提出了一种基于自适应滤波反步法的终端滑模控制器. 系统由二阶非线性野本模型和舵机响应模型串联组成,考虑了模型不确定性和外部干扰等未知项,并由模糊系统对未知项进行在线逼近. 首先引入二阶低通滤波器,避免了对虚拟控制律的解析求导,从而简化了反步控制器的设计,而且滤波器的低通特性可大大减小测量噪声的影响;然后利用滤波反步法的结果设计了终端滑模面,并最终得到了使系统跟踪误差有限时间收敛的终端滑模控制器. 根据Lyapunov理论证明了闭环系统所有误差变量均是一致最终有界的. 仿真结果验证了所提方法的有效性

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