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第1期 王飞等:基于积分型Lyapunov函数的随机非线性系统的自适应控制 ·25· a1=-k11-m,(元), 参考文献 1 u=-4-府p:), [Pan Z C,Basar T.Backstepping controller design for nonlinear stochastic systems under a risksensitive cost criterion//Proceed- ings of American Control Conference,1997:1278 W,=r(e,()-om,),i=1,2 2]Pan Z C,Basar T.Adaptive controller design for tracking and dis- 式中,a1=x1-ya2=x2-a,1=(x1ya少)T, turbance attenuation in parametric strict-feedback nonlinear sys- tems.IEEE Trans Autom Control,1998,43(8):1066 =4尝a)八g0+ B]Liu Y G,Shi S J,Pan Z G.Backstepping robust adaptive feed- back control design for stochastic nonlinear systems.Acta Autom 心4+01,神经网络节点数4=50,h=60,基 Sin,2001,27(5):613 (刘允刚,施颂椒,潘子刚.随机非线性系统鲁棒自适应反馈 函数的宽度u1:=0.02(i-25),i=1,2,…,50,2:= 控制器的积分反推方法设计.自动化学报,2001,27(5): 613) 0.03(i-30),i=1,2,…,60,中心7:=72=1.初 [4]Deng H,Krstic M.Stochastic nonlinear stabilization:I.A back- 始条件为(x1(0),2(0)T=(0.1,-0.2)T, stepping design.Syst Control Lett,1997,32(3):143 ((0),d(0))T=(0,0)T,设计参数为k=k2= 5] Deng H,Krstic M.Output-feedback stochastic nonlinear stabiliza- 40,T1=T2=diag(10,10),o1=o2=0.01.仿真结 tion.IEEE Trans Autom Control,1999,44(2):328 果如图1和图2所示. [6]Deng H,Krstic M,Williams R J.Stabilization of stochastic non- linear systems driven by noise of unknown covariance.IEEE Trans 一输出y Autom Control,2001,46(8):1237 跟踪期望的 [7]Liu S J.Zhang J F.Output-feedback control of a class of stochas- 轨迹ya tic nonlinear systems with linearly bounded unmeasurable states. Int J Robust Nonlinear Control,2008,18(6):665 [8]Liu SJ.Ge SS,Zhang J F.Adaptive output-feedback control for a class of uncertain stochastic non-inear systems with time delays Int J Control,2008,81(8):1210 10 20 时间s Chen W S,Jiao LC,Li J,et al.Adaptive NN backstepping out- 图1输出y跟踪期望的轨迹y put-feedback control for stochastic nonlinear strict-feedback sys- Fig.1 Output y following the desired trajectory ya tems with timevarying delays.IEEE Trans Syst Man Cybern Part B,2010,40(3):939 [10]Li J,Li J M,Chen W S.Adaptive neural network output-feed- back stabilization for a class of stochastic nonlinear strict-feedback systems.Acta Autom Sin,2010,36(3):450 (李靖,李俊民,陈为胜。随机非线性严格反馈系统的自适 -100 应神经网络输出反馈镇定.自动化学报,2010,36(3):450) [11]Yu Z X,Du H B.Neural-network-based bounded adaptive stabi- -200 lization uncertain stochastic nonlinear systems with time-delay. 300% 10 15 20 Control Theory Appl,2010,27(7):855 时间/s (余昭旭,杜红彬.基于神经网络的不确定随机非线性时滞 系统自适应有界镇定.控制理论与应用,2010,27(7):855) 图2控制信号” Psillakis HE.Alexandridis AT.NN-based adaptive tracking control Fig.2 Control signal u of uncertain nonlinear systems disturbed by unknown covariance noise.IEEE Trans Neural Netuorks,2007,18(6):1830 4结论 [13]Zhang T P,Zhang H Y,Gu H J.Direct adaptive fuzzy control based on backstepping technique.Control Decis,2004,19(1) 讨论了一类随机严格反馈非线性系统的自适应 (张天平,张惠艳,顾海军.基于后推设计的直接自适应模糊 跟踪控制问题.通过引入积分型Lyapunov函数,并 控制.控制与决策,2004,19(1):22) 基于后推设计、Young's不等式以及径向基函数神 04] Wang Y C.Zhang H G,Wang Y Z.Fuzzy adaptive control of 经网络的逼近性质,提出了一种自适应神经网络跟 stochastic nonlinear systems with unknown virtual control gain function.Acta Autom Sin,2006,32 (2):170 踪控制策略.根据Lyapunov方法,在后推设计的每 [15]Liu S J,Zhang J F,Jiang Z P.A notion of stochastic input-to- 步确定了可调参数的自适应律.理论分析证明了 state stability and its application to stability of cascaded stochastic 闭环系统的所有信号依概率有界 nonlinear systems.Acta Math Appl Sin,2008,24(1):141第 1 期 王 飞等: 基于积分型 Lyapunov 函数的随机非线性系统的自适应控制 α1 = - k1 z1 - W^ T 1φ1 ( z1 ) , u = - k2 z2 - 1 4λ4 1 z2 - W^ T 2φ2 ( z2 ) , W^ · i = Γi ( z 3 i φi ( zi ) - σiW^ i ) , i = 1,2. 式中,z1 = x1 - yd,z2 = x2 - α1,z1 = ( x1,yd,y · d ) T , z2 = ( x1,x2,α1,α1 x1 , 2 α1 x 2 1 ,β1 ) T ,β1 = α1 yd y · d + α1 y · d y ·· d + α1 w^ 1 w^ · 1,神经网络节点数 l1 = 50,l2 = 60,基 函数的宽度 μ1i = 0. 02( i - 25) ,i = 1,2,…,50,μ2i = 0. 03( i - 30) ,i = 1,2,…,60,中心 η1i = η2i = 1. 初 始条 件 为 ( x1 ( 0 ) ,x2 ( 0 ) ) T = ( 0. 1,- 0. 2 ) T , ( w^ T 1 ( 0) ,w^ T 2 ( 0) ) T = ( 0,0) T ,设计参数为 k1 = k2 = 40,Γ1 = Γ2 = diag( 10,10) ,σ1 = σ2 = 0. 01. 仿真结 果如图 1 和图 2 所示. 图 1 输出 y 跟踪期望的轨迹 yd Fig. 1 Output y following the desired trajectory yd 图 2 控制信号 u Fig. 2 Control signal u 4 结论 讨论了一类随机严格反馈非线性系统的自适应 跟踪控制问题. 通过引入积分型 Lyapunov 函数,并 基于后推设计、Young’s 不等式以及径向基函数神 经网络的逼近性质,提出了一种自适应神经网络跟 踪控制策略. 根据 Lyapunov 方法,在后推设计的每 一步确定了可调参数的自适应律. 理论分析证明了 闭环系统的所有信号依概率有界. 参 考 文 献 [1] Pan Z G,Basar T. Backstepping controller design for nonlinear stochastic systems under a risk-sensitive cost criterion / / Proceed￾ings of American Control Conference,1997: 1278 [2] Pan Z G,Basar T. Adaptive controller design for tracking and dis￾turbance attenuation in parametric strict-feedback nonlinear sys￾tems. IEEE Trans Autom Control,1998,43( 8) : 1066 [3] Liu Y G,Shi S J,Pan Z G. Backstepping robust adaptive feed￾back control design for stochastic nonlinear systems. Acta Autom Sin,2001,27( 5) : 613 ( 刘允刚,施颂椒,潘子刚. 随机非线性系统鲁棒自适应反馈 控制器的积分反推方 法 设 计. 自 动 化 学 报,2001,27 ( 5 ) : 613) [4] Deng H,Krstic' M. Stochastic nonlinear stabilization: Ⅰ. A back￾stepping design. Syst Control Lett,1997,32( 3) : 143 [5] Deng H,Krstic' M. Output-feedback stochastic nonlinear stabiliza￾tion. IEEE Trans Autom Control,1999,44( 2) : 328 [6] Deng H,Krstic' M,Williams R J. Stabilization of stochastic non￾linear systems driven by noise of unknown covariance. IEEE Trans Autom Control,2001,46( 8) : 1237 [7] Liu S J,Zhang J F. Output-feedback control of a class of stochas￾tic nonlinear systems with linearly bounded unmeasurable states. Int J Robust Nonlinear Control,2008,18( 6) : 665 [8] Liu S J,Ge S S,Zhang J F. Adaptive output-feedback control for a class of uncertain stochastic non-linear systems with time delays. Int J Control,2008,81( 8) : 1210 [9] Chen W S,Jiao L C,Li J,et al. Adaptive NN backstepping out￾put-feedback control for stochastic nonlinear strict-feedback sys￾tems with time-varying delays. IEEE Trans Syst Man Cybern Part B,2010,40( 3) : 939 [10] Li J,Li J M,Chen W S. Adaptive neural network output-feed￾back stabilization for a class of stochastic nonlinear strict-feedback systems. Acta Autom Sin,2010,36( 3) : 450 ( 李靖,李俊民,陈为胜. 随机非线性严格反馈系统的自适 应神经网络输出反馈镇定. 自动化学报,2010,36( 3) : 450) [11] Yu Z X,Du H B. Neural-network-based bounded adaptive stabi￾lization uncertain stochastic nonlinear systems with time-delay. Control Theory Appl,2010,27( 7) : 855 ( 余昭旭,杜红彬. 基于神经网络的不确定随机非线性时滞 系统自适应有界镇定. 控制理论与应用,2010,27( 7) : 855) [12] Psillakis H E,Alexandridis A T. NN-based adaptive tracking control of uncertain nonlinear systems disturbed by unknown covariance noise. IEEE Trans Neural Networks,2007,18( 6) : 1830 [13] Zhang T P,Zhang H Y,Gu H J. Direct adaptive fuzzy control based on backstepping technique. Control Decis,2004,19( 1) : 22 ( 张天平,张惠艳,顾海军. 基于后推设计的直接自适应模糊 控制. 控制与决策,2004,19( 1) : 22) [14] Wang Y C,Zhang H G,Wang Y Z. Fuzzy adaptive control of stochastic nonlinear systems with unknown virtual control gain function. Acta Autom Sin,2006,32( 2) : 170 [15] Liu S J,Zhang J F,Jiang Z P. A notion of stochastic input-to￾state stability and its application to stability of cascaded stochastic nonlinear systems. Acta Math Appl Sin,2008,24( 1) : 141 ·25·
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