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为了减少不准确数据对模糊系统的影响, 本文利用准均匀B样条小波方法光顺了B样条模糊系统. 首先将B样条模糊系统的多分辨率表示转化为准均匀B样条函数的多分辨率表示, 接着利用准均匀B样条小波分解方法对相应的准均匀B样条函数进行分解就得到了一系列光顺性逐渐增强、规则个数逐渐减少的模糊系统, 即基于小波方法的光顺B样条模糊系统. 最后, 仿真结果表明, 小波方法光顺的B样条模糊系统构造的模糊控制器在改善原来B样条模糊系统构造的模糊控制器性能的同时, 大大提高了原来控制器的运行效率. 相似文献
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两类模糊系统具有插值性的充要条件 总被引:3,自引:0,他引:3
当模糊系统具有插值性时,它必具有泛逼近性.因此,由插值性可以分析模糊系统的逼近能力.本文讨论了由“交”和“并”的方式聚合推理规则所生成的两类模糊系统的插值性问题.首先,通过分析由“单点”模糊化方法、CRI(com positional ru le of inference)算法以及“重心法”构造的模糊系统,指出模糊系统是否具有插值性关键取决于模糊蕴含算子的第二个变量为0和1时的表达式或取值.在此基础上,得到两类模糊系统具有插值性的充要条件.最后给出了满足这两个充要条件的一些常用的蕴涵算子. 相似文献
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用B样条神经网络设计自适应模糊控制器* 总被引:6,自引:1,他引:5
本文提出一种可用于设计自适应模糊控制器的模化B样条神经网络,并给出了合适的训练算法。由于这种网络在每次训练时仅需对少量权重进行调整,因此构成的模糊控制器学习速率快,可应用于过程控制中。本文最后以电厂中过热汽温的控制为例,说明本文的设计方法是有效的。 相似文献
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自适应B样条模糊神经网络控制器的设计 总被引:2,自引:0,他引:2
B样条具有最小局部支撑和易于实现的优点。文章利用多变量B样条网络在运算表达式上与模糊神经网络结构之间的对等关系,并通过对其权值的训练,设计出自适应B样条模糊神经网络控制器。应用于具有严重非线性摩擦力影响的速度跟踪系统的仿真实验表明,所设计的控制器完全等价于模糊神经网络控制器,同时在计算量和实现上具有明显的优势。 相似文献
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模糊B样条基神经网络及其在机器人轨迹跟踪中的应用 总被引:3,自引:0,他引:3
提出一种模糊神经网络控制器并用于机器人轨迹跟踪控制.这种模糊神经网络利用B样条基函数作为隶属函数,可在线根据误差调整隶属函数的形状,使模糊神经网络具有更强的学习和适应能力.仿真与实验结果表明这种网络能很好的用于机器人的轨迹跟踪控制,具有很好的性能. 相似文献
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The normal numbers of the fuzzy systems and their classes 总被引:1,自引:0,他引:1
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广义递阶Mamdani模糊系统及其泛逼近性 总被引:1,自引:1,他引:1
从解决模糊系统的“规则爆炸”问题出发,本文首先给出广义递阶M amdan i模糊系统的定义,然后证明其与具有中间变量的广义M amdan i模糊系统等价,并借助方形分片线性函数构造性的证明了在最大模和积分模意义下该系统是泛逼近器.最后仿真实例证实了该系统的有效性. 相似文献
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Yan-Jun Liu Shao-Cheng Tong Wei Wang Yong-Ming Li 《International Journal of Control, Automation and Systems》2009,7(4):681-690
A direct adaptive fuzzy control algorithm is developed for a class of uncertain SISO nonlinear systems. In this algorithm,
it doesn’t require to assume that the system states are measurable. Therefore, it is needed to design an observer to estimate
the system states. Compared with the numerous alternative approaches with respect to the observer design, the main advantage
of the developed algorithm is that on-line computation burden is alleviated. It is proven that the developed algorithm can
guarantee that all the signals in the closed-loop system are uniformly ultimately bounded and the tracking error converges
to a small neighborhood around zero. The simulation examples validate the feasibility of the developed algorithm.
Recommended by Editorial Board member Zhong Li under the direction of Editor Young-Hoon Joo. This work is supported by National
Natural Science Foundation of China under grant 60674056, 60874056, and the Foundation of Educational Department of Liaoning
Province (2008312).
Yan-Jun Liu received the B.S. degree in Applied Mathematics from Shenyang University of Technology in 2001. He received the M.S. degree
in Control Theory and Control Engineering from Shenyang University of Technology in 2004 and the Ph.D. degree in Control Theory
and Control Engineering from Dalian University of Technology, China, in 2007. His research interests include fuzzy control
theory, nonlinear control and adaptive control.
Shao-Cheng Tong received the B.S. degree in Department of Mathematics from Jinzhou Normal College, China, in 1982. He received the M.S. degree
in Department of Mathematics from Dalian Marine University in 1988 and the Ph.D. degree in Control Theory and Control Engineering
from Northeastern University, China, in 1997. His research interests include fuzzy control theory, nonlinear control, adaptive
control, and system identification etc.
Wei Wang received the B.S. degree in Department of Automation from Northeastern University, China, in 1982. He received the M. S.
degree in Department of Automation from Northeastern University in 1984 and the Ph.D. degree in Department of Automation from
Northeastern University, China, in 1988. His research interests include adaptive predictive control, intelligent control,
and production scheduling method etc.
Yong-Ming Li received the B.S. degree in Applied Mathematics from Liaoning University of Technology in 2004. He received the M.S. degree
in Applied Mathematics from Liaoning University of Technology in 2007. His research interests include fuzzy control theory,
nonlinear control and adaptive control. 相似文献
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张惠艳 《计算机工程与应用》2009,45(26):206-209
针对一类不确定非线性系统,基于backstepping方法提出了一种新的鲁棒自适应模糊控制器设计方案。该方案通过引入最优逼近误差的自适应补偿项和新的鲁棒项,削减建模误差和参数估计误差的影响,从而在稳定性分析中取消了要求逼近误差平方可积或逼近误差的上确界已知的条件。理论分析证明了闭环系统状态有界,跟踪误差收敛到零的较小邻域内。仿真结果表明了该方法的有效性。 相似文献