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1、南開大學(xué)碩士學(xué)位論文動(dòng)力學(xué)系統(tǒng)中混沌與間隙混沌的分析和電路實(shí)現(xiàn)姓名:倉詩建申請學(xué)位級(jí)別:碩士專業(yè):模式識(shí)別與智能系統(tǒng)指導(dǎo)教師:陳增強(qiáng)20080501中文摘要由于混沌現(xiàn)象在許多領(lǐng)域被發(fā)現(xiàn),因而混沌成為近來非線性動(dòng)力學(xué)中一個(gè)非常重要的研究課題,本文從Lorenz系統(tǒng)出發(fā),詳細(xì)介紹分析混沌系統(tǒng)的研究方法和混沌系統(tǒng)的電路實(shí)現(xiàn)步驟,并對間隙混沌作了概括和總結(jié)。在Lorenz系統(tǒng)的基礎(chǔ)上設(shè)計(jì)了一個(gè)超混沌系統(tǒng)和一個(gè)非自治超混沌系統(tǒng),通過數(shù)值仿真、分形分析和電路實(shí)驗(yàn)驗(yàn)證混沌和超混沌的存在性,重點(diǎn)給出超混沌電路系統(tǒng)的設(shè)計(jì)方法,深入分析非自治超混沌系統(tǒng)中存在多樣性的間隙混沌。以Chua電路為模型,設(shè)計(jì)了一個(gè)簡單
2、的可靈活調(diào)節(jié)參數(shù)的非自治電路系統(tǒng),從多方位驗(yàn)證存在該系統(tǒng)存在豐富的動(dòng)力學(xué)特性。最后通過一個(gè)級(jí)數(shù)可調(diào)的開關(guān)型間隙混沌系統(tǒng),深入分析產(chǎn)生間隙混沌現(xiàn)象的機(jī)制,給出數(shù)學(xué)模型及其可靠型證明,從統(tǒng)計(jì)學(xué)角度分析其中存在的概率分布,詳細(xì)給出此系統(tǒng)各個(gè)模塊的電路實(shí)現(xiàn)。關(guān)鍵字:混沌,超混沌,間隙混沌,電路實(shí)現(xiàn)AbstractBecausechaosphenomenawereobservedinmanyfields,chaoshasbecomeanimportanttopicinnonlineardynamicsrecentlyThispapergivesadetailedintroductionaboutthe
3、researchmethodsofchaoticsystemanditsstepsofcircuitimplementationbyLorenzsystem,andmakesasummaryofintermittency.BasedonLorenzsystem,anewautonomoushyper-chaoticsytemandanewnon—autonomoushyper-chaoticsystemareproposed.Vianumericalsimulation,bifurcationanalysisandexperimentalcircuit,chaos,hyper-chaosan
4、dsomeotherphenomenaareobtained.Themethodofcircuitdesignisafocusinit.Aprofoundanalysisisgivenaboutmultipleformintermittenyinthenon-autonomoushyper-chaoticsystem.Additionally,asimplenon—autonomouscircuitsytem,whoseoneparermetercanbeadjustedarbitrarily,isdesignedonthebasisoforiginalChuacircuit.Therich
5、dynamicbehaviorsareverifiedbynumericalsimulation,EWBsimulationandexperimentalcircuit.Finnally,inlightofan“on-off'’intermittencysytemwithadjustablelaminarstatelevel,analyzethemechanismofgeneratingmultiplelevelson-offintermittency,andprovethereliabilityofstatelevelcontrolledbyasaturationfunction,andc
6、alculateprobabilitydistributionfromastatisticalpointofview,andrealizethesystembyhardware.Keyword:Chaos,Hyper-chaos,Intermittency,CircuitImplementation圖目錄圖1.1Lorenz系統(tǒng)的混沌吸引子?????????????????..7圖1.2Chen系統(tǒng)的混沌吸引子??????????????????.9圖1.3珊系統(tǒng)的混沌吸引子????????????????????10圖1.4R0sslor系統(tǒng)的混沌吸引子?????????????????.
7、11圖1.5不同初始條件下的狀態(tài)變量x時(shí)間序列???????????12圖1.6Lorenz系統(tǒng)在x一刊舊平面的軌跡??????????????.13圖1.7Lorenz系統(tǒng)隨參數(shù)C變化的分形圖??????????????14圖1.8X=0的龐加萊截面????????????????????..15圖1.9軌道的指數(shù)分離?????????????????????.16圖1.1O參數(shù)C變化時(shí)Lorenz系統(tǒng)的L