毛北行,王戰(zhàn)偉
鄭州航空工業(yè)管理學(xué)院數(shù)理系,河南鄭州 450015
?
Received:2015-05-17;Accepted:2015-09-23
Foundation:National Natural Science Foundation of China(11404291); Key Scientific Research Project of Colleges and Universities of Henan Province(15B110011)
? Corresponding author:Associate professor Mao Beixing. E-mail: bxmao329@163.com
Citation:Mao Beixing, Wang Zhanwei. Finite-time synchronization control of a class of fractional-order complex network systems[J]. Journal of Shenzhen University Science and Engineering, 2016, 33(1): 96-101.(in Chinese)
【應(yīng)用數(shù)學(xué) / Applied Mathematics】
一類分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng)的有限時(shí)間同步控制
毛北行,王戰(zhàn)偉
鄭州航空工業(yè)管理學(xué)院數(shù)理系,河南鄭州 450015
摘要:研究一類分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng)的有限時(shí)間混沌同步問題,基于Lyapunov穩(wěn)定性理論和分?jǐn)?shù)階微積分的相關(guān)理論,給出控制律的設(shè)計(jì),得到了系統(tǒng)取得有限時(shí)間同步的充分條件,估算了系統(tǒng)取得同步所需的時(shí)間.研究結(jié)果表明,一定條件下分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)混沌系統(tǒng)是有限時(shí)間同步的,仿真結(jié)果驗(yàn)證了方法的可行性.
關(guān)鍵詞:分?jǐn)?shù)階系統(tǒng);有限時(shí)間;混沌同步;復(fù)雜網(wǎng)絡(luò);誤差系統(tǒng);控制
自Pecora提出驅(qū)動(dòng)—響應(yīng)同步方法以來,混沌控制與混沌同步及其應(yīng)用已逐漸成為研究熱點(diǎn)[1-5].在實(shí)際應(yīng)用中,有時(shí)希望同步過程在有限時(shí)間內(nèi)完成,達(dá)到所謂“有限時(shí)間同步”[6-8].采用不同的控制方法可達(dá)到混沌系統(tǒng)的有限時(shí)間同步.文獻(xiàn)[9]研究Lurie混沌系統(tǒng)的有限時(shí)間同步,給出系統(tǒng)實(shí)現(xiàn)快速同步的充分條件;文獻(xiàn)[10]研究一類分?jǐn)?shù)階不確定系統(tǒng)的有限時(shí)間魯棒混沌同步,給出控制律的設(shè)計(jì)和實(shí)現(xiàn)快速同步的條件.本文研究一類分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng)的有限時(shí)間混沌同步問題,基于Lyapunov穩(wěn)定性理論及分?jǐn)?shù)階微積分的相關(guān)理論,給出實(shí)現(xiàn)有限時(shí)間同步的充分條件,仿真結(jié)果驗(yàn)證該方法是可行的.
1預(yù)備知識(shí)
定義1[11]Caputo分?jǐn)?shù)階導(dǎo)數(shù)定義為
n-1<α 考慮如下分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng) (1) 其中, i表示系統(tǒng)節(jié)點(diǎn), 1≤i≤N, N為網(wǎng)絡(luò)的節(jié)點(diǎn)連接個(gè)數(shù); j表示系統(tǒng)連接節(jié)點(diǎn); f(·)是連續(xù)可微的非線性函數(shù); xi(t)=[xi1(t),xi2(t),…,xin(t)]T∈Rn是節(jié)點(diǎn)i的狀態(tài)變量; xi1(t),xi2(t),…,xin(t)是狀態(tài)變量 xi(t)的各個(gè)分量, n為狀態(tài)變量的維數(shù); C=(cij)N×N為N×N階的耦合配置矩陣, cij為耦合配置矩陣的耦合矩陣元素; A為內(nèi)部耦合矩陣,反映了網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)和節(jié)點(diǎn)的耦合強(qiáng)度. 以系統(tǒng)(1)作為驅(qū)動(dòng)系統(tǒng),設(shè)計(jì)響應(yīng)系統(tǒng)為 Dαyi(t)=f(yi(t))+ (2) 其中, yi和yj為響應(yīng)系統(tǒng)狀態(tài)變量;ui(t)為控制器. 定義系統(tǒng)誤差ei(t)=yi(t)-xi(t), 上述兩式相減得誤差系統(tǒng)方程為 Dαei(t)=f(yi)-f(xi)+ (3) 2主要結(jié)果 根據(jù)引理1得 (4) 其中, ρ=min{ki(i=1,2,…,n)}, v=min{li(i=1,2,…,n)}. 根據(jù)不等式(4)得 因此 (5) 對(duì)式(5)兩邊從0到T積分, e(T)=0, T=max{ti(i=1,2,…,n)}, 得 考慮如下分?jǐn)?shù)階不確定復(fù)雜網(wǎng)絡(luò)系統(tǒng) Dαxi(t)=f(xi(t))+Δf(xi(t))+ (6) 其中,Δf(xi(t))表示來自驅(qū)動(dòng)系統(tǒng)的不確定項(xiàng). 以系統(tǒng)(5)作為驅(qū)動(dòng)系統(tǒng),設(shè)計(jì)響應(yīng)系統(tǒng) Dαyi(t)=f(yi(t))+Δf(yi(t))+ (7) 其中,Δf(yi(t))表示來自響應(yīng)系統(tǒng)的不確定項(xiàng). 定義系統(tǒng)誤差ei=yi-xi, 則得到誤差系統(tǒng)為 Dαei(t)=f(yi)-f(xi)+Δf(yi)-Δf(xi)+ (8) 定理2選取系統(tǒng)的控制器為 Dα-1[kiei(t)+(γ+ Δf(yi(t))-Δf(xi(t))+ 根據(jù)引理1得 以下證明同定理1,在此從略. 3數(shù)值仿真 為方便,取含3個(gè)節(jié)點(diǎn)的網(wǎng)絡(luò)進(jìn)行仿真. 選取分?jǐn)?shù)階Lorenz系統(tǒng)為例,驅(qū)動(dòng)系統(tǒng)描述為 響應(yīng)系統(tǒng)設(shè)計(jì)為 誤差系統(tǒng)為 其中, a、b和c為系統(tǒng)參數(shù).當(dāng)α=0.93, a=10, b=28, c=8/3時(shí)系統(tǒng)處于混沌狀態(tài). 為了方便,取含3個(gè)節(jié)點(diǎn)的網(wǎng)絡(luò)進(jìn)行仿真. 定理1中選取控制器 其中, A=I3; li=1; ki=1; γ=0.5; μ=0.95. 系統(tǒng)初始值(x1(0), x2(0), x3(0))=(1,2,-1), 選取步長(zhǎng)為0.01 s,所得誤差曲線如圖1.可見,當(dāng)T>0.043 s后,系統(tǒng)取得同步. 圖1 定理1的系統(tǒng)誤差曲線(N=3)Fig.1 The system error curves of theorem 1 (N=3) 定理2以下述系統(tǒng)為例: 其誤差系統(tǒng)為 Δf(x1)+u1(t) Δf2(y2)-Δf2(x2)+u2(t) Δf3(y3)-Δf3(x3)+u3(t) 其中,Δf1=-0.1sin(4t)x1;Δf2=0.1sin(3t)x2; Δf3=0.15sin(t)x3; A=I3; li=1; ki=1; γ=0.5; μ=0.95. 系統(tǒng)初始值(x1(0), x2(0), x3(0))=(1,1,-1), 選取步長(zhǎng)為0.01 s,誤差曲線如圖2.可見,當(dāng)T>0.046 s后,系統(tǒng)取得同步. 圖2 定理2的系統(tǒng)誤差曲線(N=3)Fig.2 The system error curves of theorem 2 (N=3) 增加結(jié)點(diǎn)的數(shù)量,當(dāng)N=6時(shí),系統(tǒng)誤差曲線如圖3.可見,當(dāng)T>0.056 s以后,系統(tǒng)取得同步,表明隨著結(jié)點(diǎn)的增加,要求系統(tǒng)取得同步所需時(shí)間更長(zhǎng). 以下考慮系統(tǒng)有不同結(jié)點(diǎn)情形,以N=3為例,單個(gè)結(jié)點(diǎn)為分?jǐn)?shù)階Liu系統(tǒng): Dαy1=-y1-y22 Dαy2=2.5y2-4y1y3 Dαy3=-5y3+4y1y2 網(wǎng)絡(luò)節(jié)點(diǎn)為分?jǐn)?shù)階Chen系統(tǒng): Dαx1=35(x2-x1) Dαx2=-7x1-x1x2+28x2 Dαx3=-3x3+x1x2 圖3 N=6時(shí)的系統(tǒng)誤差曲線Fig.3 The system error curves with N=6 圖4 不同結(jié)點(diǎn)系統(tǒng)的誤差曲線(N=3)Fig.4 The error curves of systems with different nodes (N=3) 圖5 選取不同Lyapunov函數(shù)時(shí)的誤差曲線Fig.5 The error curves for different Lyapunov functions 結(jié)語(yǔ) 基于Lyapunov穩(wěn)定性理論和分?jǐn)?shù)階微積分的相關(guān)理論,研究一類分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng)的有限時(shí)間混沌同步問題,給出控制器的設(shè)計(jì),并估計(jì)系統(tǒng)取得同步所需的時(shí)間,使系統(tǒng)能夠在有限時(shí)間內(nèi)實(shí)現(xiàn)快速同步. 引文:毛北行,王戰(zhàn)偉. 一類分?jǐn)?shù)階復(fù)雜網(wǎng)絡(luò)系統(tǒng)的有限時(shí)間同步控制[J]. 深圳大學(xué)學(xué)報(bào)理工版,2016,33(1):96-101. 參考文獻(xiàn)/ References: [1] 余明哲,張友安. 一類不確定分?jǐn)?shù)階混沌系統(tǒng)的滑模自適應(yīng)同步[J]. 北京航空航天大學(xué)學(xué)報(bào),2014,40(9):1276-1280. 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Journal of Computation and Nonlinear Dynamics, 2012, 7(2): 021010. 【中文責(zé)編:方圓;英文責(zé)編:木南】 Finite-time synchronization control of a class of fractional-order complex network systems Mao Beixing?and Wang Zhanwei Department of Mathematics and Physics, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, Henan Province, P.R.China Abstract:Based on the Lyapunov stability theory and fractional order system theory, we investigate the finite-time chaos synchronization problem of a class of fractional order complex network systems, propose a control law and the sufficient conditions for the synchronization of systems, and estimate the time for the synchronization of systems. It is shown that the fractional order complex network systems are finite-time synchronized under a certain condition. Numerical simulations are performed to verify the effectiveness of the proposed method. Key words:fractional order systems; finite-time; chaos synchronization; complex network; error system; control 作者簡(jiǎn)介:毛北行 (1976—),男,鄭州航空工業(yè)管理學(xué)院副教授. 研究方向:復(fù)雜網(wǎng)絡(luò)與混沌同步. E-mail: bxmao329@163.com 基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(11404291);河南省高等學(xué)校重點(diǎn)科研資助項(xiàng)目(15B110011) 中圖分類號(hào):O 482.4 文獻(xiàn)標(biāo)志碼:A doi:10.3724/SP.J.1249.2016.01096