41 10 Vol. 41, No ACTA AUTOMATICA SINICA October, ,, (Least square support vector machines, LS-SVM)., LS-SVM,,,, ;,,, ;,. DOI,,,,,
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1 4 0 Vol. 4, No ACTA AUTOMATICA SINICA October, 05,, Least square support vector machnes, LS-SVM)., LS-SVM,,,, ;,,, ;,. DOI,,,,,.., 05, 40): /j.aas.05.c507 Data-based Approxmate Soluton for a Class of Affne Nonlnear Systems wth Partally Unknown Functons ZHANG Guo-Shan WANG Yan-Hao Abstract A new method named onlne unbased least square support vector machnes LS-SVMs) s proposed by usng onlne samplng data to fnd the approxmate soluton of a class of partally unknown affne nonlnear systems wthn the nfnte nterval. Frstly, we elmnate the bas of LS-SVMs by ntroducng a parameter to avod redundant computaton, meanwhle, we gve the data ponts whch are closer to the current moment more weghts by ntroducng a weght functon to the optmzed target, thus the computatonal accuracy s mproved. Secondly, the method of sldng tme wndow s employed to acheve the approxmate soluton for affne nonlnear systems wthn the nfnte nterval and meet the requrement of real-tme solvng. Fnally, smulatons of numercal examples demonstrate the effcency and superorty of the proposed method. Key words Affne nonlnear system, data-drven control, least square support vector machnes LS-SVM), sldng tme wndow, machne learnng Ctaton Zhang Guo-Shan, Wang Yan-Hao. Data-based approxmate soluton for a class of affne nonlnear systems wth partally unknown functons. Acta Automatca Snca, 05, 40): ,., [ ] [3] [4].. [5] [6], Taylor Runge-Kutta [7].,,.,. [8] Adoman Manuscrpt receved May, 05; accepted July 7, , 64730) Supported by Natonal Natural Scence Foundaton of Chna , 64730) Recommended by Assocate Edtor HOU Zhong-Sheng School of Electrcal Engneerng and Automaton, Tanjn Unversty, Tanjn 30007,,. [9],,,..,.,,, [0], []. [] Least square support vector machnes, LS-SVM),.,.,, [3 4],
2 [5],,,,.,,,.. LS-SVM) SVM),.,. LS-SVM ξ, ) SVM ξ, SVM,,. SVM LS-SVM, SVM,.. LS-SVM,.. LS-SVM. yx) = w T ϕx) + b ), w R h, b R, ϕ ) : R m R h, R m ) R h ). ϕ ),, [],,. {x, y }, =,,, N, x R m, y R, w, b, ).,, LS-SVM : mn Jw, ξ) = wt w + γ ξt ξ s. t. y = w T ϕx ) + b + ξ, =,,, N ), γ R +,, ) mn wt w) mn ξt ξ),., : Lw, b, ξ, α) = Jw, ξ) N [ ] 3) α w T ϕx ) + b + ξ y Karush-Kuhn-Tucker KKT) [6], : = 0 ξ = α ξ γ w = 0 w = N α ϕx ) = 0 N α = 0 b = 0 w T ϕx ) + b + ξ y = 0 α w, ξ : [ ] [ ] [ ] Ω + I N γ N α y = T N 0 b 0 4), N = [,,, ] T R N, α = [α, α,, α N ] T R N, y = [y, y,, y N ] T R N, I N. Ω R N N, j : Ω j = Ω, j) = Kx, y j ) = [ϕx )] T ϕx j ). yx) = N α Kx, x) + b 5), y,. Mercer [6], ϕ ) [7]., [8] : ϕu) T ϕv) = Ku, v), : m n n+m u n v m 6) [ϕ n) u)] T ϕ m) v) = m n [ϕu) T ϕv)] = m n [Ku, v)] = m+n Ku, v) u n v m 7)
3 0 : 747, 7). : 0 [Ku, v)] = ϕu)t ϕv)) u 0[Ku, v)] = ϕu)t ϕv)) v 0 [Ku, v)] = ϕu)t ϕv)) u. = ϕ u) T ϕv) = ϕu) T ϕ v) = ϕ u) T ϕv) b, 4). [5] λ, ω, b,,. : [ ϖ T = w T, b ] [ ] ϕx), φx) = 8) λ λ ) ) mn yx) = ϖ T φx) 9) Jϖ, e) = ϖt ϖ + et e s. t. y = ϖ T φx ) + e, =,,, N 0).3 [],.,,...3. [3 4],. : K N + K, N, {x, y } R m R, = K N + ), K N + ),, K.,. x K+, y K+ ), x K N+, y K N+ ). {x, y } R m R, = K N +), K N +3),, K +,, K +.,,,,,.. 4) Ω + I ) N α = y ) γ yx) = N α Kx, x) ), Ω R N N, Ω j = Kx, x j ) = φx ) T φx j ) = ϕx ) T ϕx j ) + λ. 7) : Ω m n x, y) = m+n Kx, y) n x m y : = [φ n) x)] T φ m) y) Ω 0 0x, y) = [φx)] T φy) = [ϕx)] T ϕy) + λ Ω 0x, y) = [φx)] T φ y) = [ϕx)] T ϕ y) Ω x, y) = [φ x)] T φ y) = [ϕ x)] T ϕ y) 3) Fg..3. Schematc of the sldng tme wndow.,,.., 0 40,, 0 Hz, 0. ;,
4 748 4 LS-SVM ;,.. : {ẋx = fx) + gx)ut) y = hx) 4), x = [x, x,, x m ] T R m, ut) R p. : fx), gx)ut). : f x) u t) fx) =., ut) =. f m x) u p t) g x) g p x) gx) =..... g m x) g mp x) ˆxt), gx)ut)., fx),. gx)ut) = gux, t) = gu.. LS-SVM K, x t [t nf, t sup ],, xt ) = [x t ), x t ),, x m t )] T, = K N + ), K N + ),, K, N., fx), gx)ut)., LS-SVM. ˆx l t) = w T l φt) + b l = w T l Φt) 5) [ ], φt) w T l = [w T l, b l /λ], Φt) =, l = λ,,, m. fx) gx)ut) : ϕx w T w T ) b m ˆfx) =. ϕx.... ) w T m w T. + b. = mm ϕx m ) b m [w T, b ] λm [wt m, b ] λm..... [w T m, bm ] λm [wt mm, bm [ϕx ), λ] T. = [ w T lk] m m [Ψx)] m, [ϕx m ), λ] T λm ] l =,,, m; k =,,, m 6) ĝx)ûut) = ĝûux, t) = ˆx ˆfˆx) 7) [t nf, t sup ], w l,. : mn N [ ˆx ˆfx) ] ) gux, t) t ) s. t. ˆxt ) = xt ) + et ) 8), N, ˆxt ), xt ), ˆfx), gux, t), et ).,. θ 0 < θ ), [3] h) = θ + ) θ, =,,, N 9) N, N., θ = 0.. ˆxt ) ˆfx) 5) 6), gux, t)., h = h K + N), K, N
5 0 : 749. : mn s. t. w T l w l + c l= k= l= w T lk w lk + ε =K N+ l= h e l) + =K N+ l= h ξl) + gu T l gu l + τ h e l) l= =K N+ l= w T l Φ t ) = w T lkψx k) + gu l x, t ) + e l k= w T l Φt ) = x l + ξ l f l x ) = w T lkψx k) + e l k= 0), ξ l, e l ˆx l t ) x l t ), ˆft ) f l t ) ), c, ε, τ. : L w l, w lk, e l, e l, ξl, αl, β l, γ l, gu l ) = w T l w l + c h e l) + l= k= l= w T lk w lk + ε =K N+ l= =K N+ l= h ξ l + gu T l gu l + τ h e l) l= =K N+ l= ) f l x ) e l w lk Ψx k) l= =K N+ l= =K N+ l= =K N+ γ l β l w T l Φt ) α l k= x l ξl) + αlgu l x, t )) ) w T l Φ t ) e l w lk Ψx k) k= ), α l, β l, γ l, = K N + ), K N +),, K; l =,,, m. KKT,, : = 0 e e l = α l l c h = 0 ξ ξl l = β l ε h = 0 e e l = γ l l τ h = 0 w l = αl + γl ) Ψx w k) l =K N+ = 0 gux, t ) = αl gu l = 0 w lk = αl + γl ) Ψx w k) lk =K N+ = 0 w T l Φt ) x l ξl = 0 β l γ l = 0 f l x ) = m w l kψx k) + e l k= = 0 w T αl l Φ t ) e l Ψx k) gu l x, t ) = 0, k= l, k =,,, m; = K N + ), K N + ),, K ) w l, w lk, e l, e l, ξl, : R H S α l 0 H T 0 γ l = f l 3) S 0 Q β l, l =,, m, α l = [αl, αl,, αl N ] T, γ l = [γl, γl,, γl N ] T, β l = [βl, βl,, βl N ] T, j = Ω t, t j ) + m Ω 0 k= 0 x k, xk) j, j = Ω 0 t, t j ),κ j = Ω 0 0t, t j ), Λ = m ) Ω 0 0 x k, x j k : R = k= x l + h c N..... N NN + h c Λ Λ N H =..... Λ N Λ NN N S =..... N NN
6 750 4 κ + κ N ε h Q =..... κ N κ NN + ε h Λ + Λ N τ h T =..... Λ N Λ NN + τ h, f l = [f l x ), f l x ),, f l x N )] T, x l = [x l, x l,, x N l ] T., : ˆx l t) = =K N+ α l Ω 0 t, t) + β l Ω 0 0 t, t) ), l =,, m 4), Ω. fx) gx)ut) : ˆf l x) = ĝû l x, t) = k= =K N+ k= =K N+ =K N+ ) ) α l + γ l Ω0 0 x k, x k α l Ω t, t) + β l Ω 0 t, t) ) + ) ) α l + γ l Ω0 0 x k, x k, l =,,, m 5) Radal bass functon, RBF),, : Kx, y) = exp ). x y) LS-SVM σ c, τ, ε σ., [9]. K +, K N +, K +, LS-SVM,.,,..3 : ) ; ) LS-SVM ; 3) ; 4) ), ; 5)., ;,, ; 6) 4)..4,,.,,,., LS-SVM., E,,. E,, ;,.,,.. Fg. 3 Flow chart of the algorthm,., 60, 3 8., E 0 4., 0 Hz,.
7 0 : 75, fx), gx)ut).. MSE = N xt ) ˆxt )) N 6), N, xt ), ˆxt ). [] : ) LS-SVM,, ; ),, ; 3),. [],, 3.. [, 0] : 5 6. [] 3. f t), gu x, t) f t), gu x, t) Fg. 3 3 Comparson of the system s approxmate soluton and exact soluton ẋt) = xt) x t) + xt) = + tanh )) t + log +, fx) = x, gx)ut) = x +. xt) 3,,. []. gx)ut) fx) ,,.. [, ]. ẋxt) = fx) + gx)ut) ) x + x, fx) = x x ) cost) sn t) t gx)ut) = t snt) t snt) x0) = [0 ] T. x t) = snt), x t) = + t. x t), x t) Fg. 4 Table 4 ft), gux, t) Comparson of ft), gux, t) approxmate soluton and exact soluton t [0, ] xt) MSE of xt) n terms of dfferent numbers of tranng ponts N) [] 0.69E 07.5E E 4.4E E E E E
8 75 4 Table t [0, 3] x t) MSE of x t) n terms of dfferent numbers of tranng ponts N) [] 0.057E 08.84E E E E.49E E E 4 3 Table 3 t [0, 3] x t) MSE of x t) n terms of dfferent numbers of tranng ponts 7 f t), gu x, t) Fg. 7 Comparson of f t), gu x, t) approxmate soluton and exact soluton N) [] E 3 5.9E E E E E E E 4 8 f t), gu x, t) Fg. 8 Comparson of f t), gu x, t) approxmate soluton and exact soluton 5 x t) E t) Fg. 5 Comparson of x t) approxmate soluton, exact soluton and error E t)., ẋx = fx, t) ẋx = fx, t) + gx, t)u,. 4 6 x t) E t) Fg. 6 Comparson of x t) approxmate soluton, exact soluton and error E t),,. 4 : ),,,.,,,. ),
9 0 : 753,,,. 3).,. 4),. References Mohaqeq M, Kargah M, Dehghan M. Adaptve schedulng of real-tme systems cosuppled by renewable and nonrenewable energy sources. ACM Transactons on Embedded Computng Systems TECS), 03, 3s): Artcle No. 36 Yao W, Jang L, Fang J K, Wen J Y, Cheng S J. Decentralzed nonlnear optmal predctve exctaton control for mult-machne power systems. Internatonal Journal of Electrcal Power & Energy Systems, 04, 55: Q G Y, Chen Z Q, Yuan Z Z. Adaptve hgh order dfferental feedback control for affne nonlnear system. Chaos, Soltons & Fractals, 008, 37): Khan Z H, Gu I Y H. Nonlnear dynamc model for vsual object trackng on Grassmann manfolds wth partal occluson handlng. IEEE Transactons on Cybernetcs, 03, 436): Ramos J I. Lnearzaton technques for sngular ntal-value problems of ordnary dfferental equatons. Appled Mathematcs and Computaton, 005, 6): Odbat, Moman S. Applcaton of varatonal teraton method to nonlnear dfferental equatons of fractonal order. Internatonal Journal of Nonlnear Scences and Numercal Smulaton, 006, 7): Johnson C. Numercal Soluton of Partal Dfferental Equatons by the Fnte Element Method. Courer Corporaton, 0. 8 Duan J S, Rach R, Baleanu D, Wazwaz A M. A revew of the Adoman decomposton method and ts applcatons to fractonal dfferental equatons. Communcatons n Fractonal Calculus, 0, 3): Mall S, Chakraverty S. Numercal soluton of nonlnear sngular ntal value problems of Emden-Fowler type usng Chebyshev neural network method. Neurocomputng, 05, 49: Hou Zhong-Sheng, Xu Jan-Xn. On data-drven control theory: the state of the art and perspectve. Acta Automatca Snca, 009, 356): ,.., 009, 356): ) Suykens J A K, Vandewalle J. Least squares support vector machne classfers. Neural Processng Letters, 999, 93): Zhang G S, Wang S W, Wang Y M, Lu W Q. LS-SVM approxmate soluton for affne nonlnear systems wth partally unknown functons. Journal of Industral and Management Optmzaton, 04, 0): Yan We-Wu, Chang Jun-Ln, Shao Hu-He. Least square SVM regresson method based on sldng tme wndow and ts smulaton. Journal of Shangha Jaotong Unversty, 004, 384): 54 56, 53,,.., 004, 384): 54 56, 53) 4 Zhou Xn-Ran, Teng Zhao-Sheng. An onlne sparse LSSVM and ts applcaton n system modelng. Journal of Hunan Unversty Natural Scences), 00, 374): 37 4,. LSSVM. ), 00, 374): 37 4) 5 Ca Yan-Nng, Hu Chang-Hua. Dynamc non-bas LS-SVM learnng algorthm based on Cholesky factorzaton. Control and Decson, 008, 3): ,. Cholesky LS-SVM., 008, 3): ) 6 Vapnk V. The Nature of Statstcal Learnng Theory nd edton). New York: Sprnger Scence & Busness Meda, Lázaro M, Santamaría I, Pérez-Cruz F, Artés-Rodríguez A. Support vector regresson for the smultaneous learnng of a multvarate functon and ts dervatves. Neurocomputng, 005, 69 3): Mehrkanoon S, Falck T, Suykens J A K. Approxmate solutons to ordnary dfferental equatons usng least squares support vector machnes. IEEE Transactons on Neural Networks and Learnng Systems, 0, 39): Cawley G C, Talbot N L C. Fast exact leave-one-out crossvaldaton of sparse least-squares support vector machnes. Neural Networks, 004, 70): El-Tawl M A, Bahnasaw A A, Abdel-Naby A. Solvng Rccat dfferental equaton usng Adoman s decomposton method. Appled Mathematcs and Computaton, 004, 57): Lagars I E, Lkas A, Fotads D I. Artfcal neural networks for solvng ordnary and partal dfferental equatons. IEEE Transactons on Neural Networks, 998, 95): ,.. E-mal: zhanggs@tju.edu.cn ZHANG Guo-Shan Professor at the School of Electrcal Engneerng and Automaton, Tanjn Unversty. Hs research nterest covers lnear and nonlnear system control, ntellgent controls, Chaos control and applcaton. Correspondng author of ths paper.).,. E-mal: hhsnh03@tju.edu.cn WANG Yan-Hao Master student at the School of Electrcal Engneerng and Automaton, Tanjn Unversty. Hs research nterest covers machne learnng and data-drven control.)
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