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Optimal parameters for a damped sine-Gordon equation

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In this paper a parameter identification problem for a damped sine-Gordon equation is studied from the theoretical and numerical perspectives. A spectral method is developed for the solution of the state and the adjoint equations. The Powell's minimization method is used for the numerical parameter identification. The necessary conditions for the optimization problem are shown to yield the bang-bang control law. Numerical results are discussed and the applicability of the necessary conditions is examined.

Abstract

In this paper a parameter identification problem for a damped sine-Gordon equation is studied from the theoretical and numerical perspectives. A spectral method is developed for the solution of the state and the adjoint equations. The Powell's minimization method is used for the numerical parameter identification. The necessary conditions for the optimization problem are shown to yield the bang-bang control law. Numerical results are discussed and the applicability of the necessary conditions is examined.

참고문헌 (11)

  1. A. R. Bishop, "Influence of solitons in the initial state on chaos in the driven damped sine-Gordon system", Phys. D, 7(1), pp.259~279 (1983)
  2. R. Dautary, "Mathematical Analysis and Numerical Methods for Science and Technology", Evolution Problems I, 5 (1992), Springer-Verlag
  3. S. Gutman, "Identification of piecewise-constant potentials by fixed-energy phase shifts", Appl. Math. Optim., 44(1), pp.49~65 (2001)
  4. J. Ha, "Existence and regularity of weak solutions for semilinear second order evolution equations", Funkcial. Ekvac., 41(1), pp.1~24 (1998)
  5. Junhong Ha, "Identification problems of damped sine-Gordon equations with constant parameters", 대한수학회지, 39(4), pp.509~524 (2002), 대한수학회
  6. Junhong Ha, "Identification problems for the system governed by abstract nonlinea damped second order evolutione quations", 대한수학회지, 41(3), pp.435~459 (2004), 대한수학회
  7. 하준홍, "Identification of constant parameters in perturbed sine-Gordon equations", 대한수학회지, 43(5), pp.931~950 (2006), 대한수학회
  8. M. Levi, "Beating modes in the Josephson junction, Chaos in nonlinear dynamical systems", pp.56~73 (1984), SIAM
  9. B. Mercier, "An Introdution to the Numerical Analysis of Spectral Methods", Lecture Notes in Physis, 318 (1989)
  10. W. H. Press, "Numerical Recepies in FORTRAN(2nd Ed.)", Cambridge University Press
  11. R. Temam, "Infinite-Dimensional Dynamical Systems in Mechanics and Physics, 2nd ed.", Applied Mathematical Sciences, 68 (1997), Springer-Verlag

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