共查询到20条相似文献，搜索用时 58 毫秒
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汪昭 《常熟理工学院学报》2011,25(10):80-84
研究了超混沌Chen系统的广义同步化问题.基于Lyapunov稳定性理论,提出了混沌系统在周期性映射下的广义同步方法.用理论和数值计算验证了该方法.最后讨论了各参数对同步的影响. 相似文献
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针对一类新构造的三维混沌系统,对系统平衡点的稳定性进行分析,并利用分岔图与Lyapunov指数等进行数值仿真.同时运用Multisim软件设计此类系统的混沌电路,最后基于Lyapunov稳定性理论,设计自适应控制器,实现系统的混沌同步.仿真结果验证所提出同步方法的有效性和可实现性.以及对研究该系统应用提供了理论参考. 相似文献
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对一类超Lorenz混沌系统的特性进行深入的研究,以确定参数调节自适应同步为核心内容.根据Lyapunov稳定性理论,给出理论证明,并使用计算机仿真模拟,采用4阶龙格-库塔方法,进行迭代计算,对驱动-响应系统的混沌同步进行仿真模拟,实现对超混沌系统现象和确定参数调节自适应同步的研究. 相似文献
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黄娟娟 《湖州师范学院学报》2008,30(2)
基于自通适应控制策略和Lyapunov稳定性理论,在参数未知的情况下,讨论了超混沌Qi系统与趟混沌Chen系统的异结构同步、设计控制器和参数估计率,实现了两个具有不同结构的超混沌系统的同步,方法简单有效,易于实现,理论分析和数值仿真的结果均证明了该方法的可行性,且该办法可以用来实现其他的超混沌系统的同步. 相似文献
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根据一类混沌系统的结构和Lyapunov稳定性理论，讨论一类混沌系统在有参数和外部扰动情况下的同步问题．在驱动系统参数已知和未知两种不同的情况下，分别设计了适当的控制器以及参数自适应律实现了一类混沌系统的同步．以Arneod。系统为例进行了数值仿真，结果表明这些控制器及参数自适应律是有效的和可行的． 相似文献
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蒋楠 《山西广播电视大学学报》2013,(4):50-52
超混沌系统的异结构同步是非线性科学领域研究的一项重要内容。基于Lyapunov稳定性理论,在参数全部未知的情况下,分别实现了超混沌Lorenz系统与超混沌Rossler系统的主动和自适应同步,并且利用数值模拟来阐释理论的有效性。 相似文献
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《河南职业技术师范学院学报(职业教育版)》2017,(6)
研究两个线性参数不确定的Liu混沌系统的自适应同步现象,找出了自适应的控制器和参数辨识结构,借助Lyapunov稳定性理论,探讨了线性参数不确定的混沌系统产生自适应同步所需的充分条件,数值仿真结果表明提出的控制方案是可行的,且同步的连度好. 相似文献
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研究了异结构混沌系统的自适应函数投影同步及未知参数的辨识问题.基于Lyapunov稳定性定理和自适应控制技术,构造了自适应控制器和系统未知参数的辨识法则,实现了异结构混沌系统的自适应函数投影同步.以著名的Lorenz系统和Lü系统为例进行了数值仿真,仿真的结果表明所构造的自适应控制器的有效性和系统未知参数辨识法则的正确性. 相似文献
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《河南职业技术师范学院学报(职业教育版)》2017,(2)
以Liu系统的混沌现象为例,画出一个混沌吸引子相图,讨论Liu混沌系统自同步的问题.研究Liu混沌系统的自适应同步和响应系统参数识别,利用参数识别自适应控制技术,设计非线性控制器,找出参数自适应律、控制器系数的范围,同时提出了控制增益.借助Lyapunov稳定性理论及La Salle不变集原理,给出了响应系统参数识别的充分条件,并通过数值仿真验证了所给方法的真实有效性. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献