Observer-Based Mixed $H_2/H_{\infty}$ Control Design for Linear Systems with Time-Varying Delays: An LMI Approach

  • Published : 2008.02.28

Abstract

This paper presents a convex optimization method for observer-based mixed $H_2/H_{\infty}$ control design of linear systems with time-varying state, input and output delays. Delay-dependent sufficient conditions for the design of a desired observer-based control are given in terms of linear matrix inequalities (LMIs). An observer-based controller which guarantees asymptotic stability and a mixed $H_2/H_{\infty}$ performance for the closed-loop system of the linear system with time-varying delays is then developed. A Lyapunov-Krasovskii method underlies the observer-based mixed $H_2/H_{\infty}$ control design. A numerical example with simulation results illustrates the effectiveness of the methodology.

Keywords

References

  1. S. I. Niculescu, E. I. Verriest, L. Dugard, and J. M. Dion, "Stability and robust stability of timedelay systems: A guided tour," Stability and Control of Time-Delay Systems, L. Dugard et al., Eds, Berlin, Springer Germany, vol. 228, pp. 1- 71, 1998
  2. M. Malek-Zavarei and M. Jamshidi, Time-delay Systems: Analysis, Optimisation and Application, North-Holland, Amsterdam, The Netherlands, 1987
  3. S. I. Niculescu, Delay Effects on Stability: A Robust Control Approach, Springer, Berlin, 2001
  4. N. MacDonald, Biological Delay Systems: Linear Stability Theory, Cambridge University Press, Cambridge, 1989
  5. Y. Kuang, Delay Differential Equations with Applications in Population Dynamics, Acadelic Press, Boston, 1993
  6. H. R. Karimi, "A computational method to optimal control problem of time-varying statedelayed systems by Haar wavelets," Int. J. Computer Mathematics, vol. 83, no. 2, pp. 235- 246, February 2006 https://doi.org/10.1080/00207160600659257
  7. N. N. Krasovskii, Stability of Motion, Stanford University Press, Stanford, CA, 1963
  8. K. Gu, "An integral inequality in the stability problem of time-delay systems," Proc. of the 39th IEEE Conference on Decision and Control, vol. 3, pp. 2805-2810, 2000
  9. E. Fridman, "New Lyapunov-Krasovskii functionals for stability of linear retarded and neutral type systems," Systems & Control Letters, vol. 43, pp. 309-319, 2001 https://doi.org/10.1016/S0167-6911(01)00114-1
  10. G. D. Hui and G. D. Hu, "Some simple stability criteria of neutral delay-differential systems," Applied Mathematics and Computation, vol. 80, pp. 257-271, 1996 https://doi.org/10.1016/0096-3003(95)00301-0
  11. H. R. Karimi, "Robust stabilization with $H{\infty}$ performance for a class of parameter-dependent systems," Mathematical Problems in Engineering, Article ID 59867, 15 pages, 2006
  12. H. R. Karimi, P. J. Maralani, and B. Moshiri "Stochastic output feedback control of a class of stochastic uncertain state-delayed systems," ISA Transactions, vol. 45, no. 2, pp. 201-213, April 2006 https://doi.org/10.1016/S0019-0578(07)60190-6
  13. W. H. Chen and W. X. Zheng, "Delay-dependent robust stabilization for uncertain neutral systems with distributed delays," Automatica, vol. 43, pp. 95-104, 2007. https://doi.org/10.1016/j.automatica.2006.07.019
  14. H. R. Karimi and M. J. Yazdanpanah, "Robust control for a class of uncertain state-delayed singularly perturbed systems," Asian Journal of Control, vol. 7, no. 2, pp. 202-208, 2005 https://doi.org/10.1111/j.1934-6093.2005.tb00390.x
  15. S. Xu and J. Lam, "Improved delay-dependent stability criteria for time-delay systems," IEEE Trans. on Automatic Control, vol. 50, no. 3, pp. 384-387, 2005 https://doi.org/10.1109/TAC.2005.843873
  16. E. Fridman and U. Shaked, "An improved stabilization method for linear time-delay Systems," IEEE Trans. on Automatic Control, vol. 47, no. 11, pp. 1931-1937, November 2002 https://doi.org/10.1109/TAC.2002.804462
  17. H. Gao and C. Wan, "Delay-dependent robust $H_{\infty}$ and $L_2 −L_{\infty}$ filtering for a class of uncertain nonlinear time-delay systems," IEEE Trans. on Automatic Control, vol. 48, pp. 1661- 1666, 2003 https://doi.org/10.1109/TAC.2003.817012
  18. H. Gao and C. Wang, "A delay-dependent approach to robust $H{\infty}$ filtering for uncertain discrete-time state-delayed systems," IEEE Trans. on Signal Processing, vol. 52, pp. 1631- 1640, 2004 https://doi.org/10.1109/TSP.2004.827188
  19. E. Frdiman, U. Shaked, and L. Xie, "Robust $H_{\infty}$ filtering of linear systems with time-varying delay," IEEE Trans. on Automatic Control, vol. 48, pp. 159-165, 2003 https://doi.org/10.1109/TAC.2002.806674
  20. E. Fridman and U. Shaked, "A new $H{\infty}$ filter design for linear time delay systems," IEEE Trans. on Signal Processing, vol. 49, no. 11, pp. 2839-2843, 2001 https://doi.org/10.1109/78.960431
  21. S. Xu, J. Lam, T. Chen, and Y. Zou, "A delay-dependent approach to robust $H_{\infty}$ filtering for uncertain distributed delay systems," IEEE Trans. on Signal Processing, vol. 53, no. 10, pp. 3764-3772, 2005 https://doi.org/10.1109/TSP.2005.855109
  22. H. R. Karimi, B. Lohmann, and C. Buskens, "A delay-dependent approach to robust filtering for LPV systems with discrete and distributed delays using PPDQ functions," International Journal of Control, Automation, and Systems, vol. 5, no. 2, pp. 170-183, April 2007
  23. K. M. Grigoriadis and J. T. Watson, "Reduced order $H_{\infty}$ and $L_2 −L_{\infty}$ filtering via linear matrix inequalities," IEEE Trans. Aerosp. Electron. Syst., vol. 33, no. 4, pp. 1326-1338, October 1997 https://doi.org/10.1109/7.625133
  24. H. Gao and C. Wan, "Comments and further results on 'A descriptor system approach to $H{\infty}$ control of linear time-delay systems'," IEEE Trans. on Automatic control, vol. 48, pp. 520- 525, 2003 https://doi.org/10.1109/TAC.2003.809154
  25. Y. S. Lee, Y. S. Moon, W. H. Kwon, and P. G. Park, "Delay-dependent robust $H_{\infty}$ control for uncertain systems with a state-delay," Automatica, vol. 40, pp. 65-72, 2004 https://doi.org/10.1016/j.automatica.2003.07.004
  26. H. R. Karimi, P. J. Maralani, B. Lohmann, and B. Moshiri, "$H_{\infty}control$ of parameter-dependent state-delayed systems using polynomial parameter-dependent quadratic functions," Int. J. Control, vol. 78, no. 4, pp. 254-263, March 2005 https://doi.org/10.1080/00207170500089455
  27. S. Xu, J. Lam, and C. Yan, "$H_{\infty}$ and positivereal control for linear neutral delay systems," IEEE Trans. on Automatic Control, vol. 46, pp. 1321-1326, 2001 https://doi.org/10.1109/9.940943
  28. J. D. Chen, "LMI approach to robust delay-dependent mixed $H_2/H_{\infty}$ controller of uncertain neutral systems with discrete and distributed time-varying delays," J. Optimization Theory and Applications, vol. 131, no. 3, pp. 383-403, 2006 https://doi.org/10.1007/s10957-006-9151-3
  29. S. Xu, J. Lam, and C. Yang, "Robust $H_{\infty}$ control for uncertain linear neutral delay systems," Optimal Control Applications and Methods, vol. 23, pp. 113-123, 2002 https://doi.org/10.1002/oca.705
  30. S. Xu, Y. Chu, J. Lu, and Y. Zou, "Exponential dynamic output feedback controller design for stochastic neutral systems with distributed delays," IEEE Trans. on Systems, Man, and Cybernetics A: Systems and Humans, vol. 36, pp. 540-548, 2006 https://doi.org/10.1109/TSMCA.2006.871648
  31. B. Chen, J. Lam, and S. Xu, "Memory state feedback guaranteed cost control for neutral systems," Int. J. Innovative Computing, Information and Control, vol. 2, no. 2, pp. 293- 303, 2006 https://doi.org/10.1109/ICICIC.2006.329
  32. C. H. Lien, "Guaranteed cost observer-based controls for a class of uncertain neutral time-delay systems," J. Optimization Theory and Applications, vol. 126, no. 1, pp. 137-156, 2005 https://doi.org/10.1007/s10957-005-2665-2
  33. W. H. Chen, Z. H. Guan, and X. Lu, "Delay-dependent guaranteed cost control for uncertain discrete-time systems with both state and input delays," J. the Franklin Institute, vol. 341, pp. 419-430, 2004 https://doi.org/10.1016/j.jfranklin.2004.04.003
  34. Z. Wang and B. Huang, "Robust $H_2/H_{\infty}$ filtering for linear systems with error variance constraints," IEEE Trans. on Signal Processing, vol. 48, no. 8, pp. 2463-2467, August 2000 https://doi.org/10.1109/78.852028
  35. H. Gao, J. Lam, L. Xie, and C. Wang, "New approach to mixed $H_2/H_{\infty}$ filtering for polytopic discrete-time systems," IEEE Trans. on Signal Processing, vol. 53, no. 8, pp. 3183-3192, August 2005 https://doi.org/10.1109/TSP.2005.851116
  36. H. Gao, J. Lam, and C. Wang, "Mixed $H_2/H_{\infty}$ filtering for continuous-time polytopic systems: A parameter-dependent approach," Circuits, Systems and Signal Processing, vol. 24, no. 6, pp. 689-702, 2005 https://doi.org/10.1007/s00034-005-0612-y
  37. E. N. Gonçalves, R. M. Palhares, and R. H. C. Takahashi, "$H_2/H_{\infty}$ filter design for systems with polytope-bounded uncertainty," IEEE Trans. on Signal Processing, vol. 54, no. 9, pp. 3620-3626, 2002 https://doi.org/10.1109/TSP.2006.877668
  38. Z. Wang, H. Zeng, D. W. C. Ho, and H. Unbehauen, "Multiobjective control of a four-link flexible manipulator: A robust $H_{\infty}$ approach," IEEE Trans. on Control Systems Technology, vol. 10, no. 6, pp. 866-875, November 2002 https://doi.org/10.1109/TCST.2002.804132
  39. H. R. Karimi, "Robust mixed $H_2/H_{\infty}$ delayed state-feedback control of uncertain neutral systems with time-varying delays," Asian Journal of Control, vol. 10, no. 5, 2008 (to appear)
  40. F. E. Thau, "Observing the state of nonlinear dynamic systems," Int. J. Control, vol. 17, pp. 471-479, 1973 https://doi.org/10.1080/00207177308932395
  41. H. Trinh, T. Fernando, and S. Nahavandi, "Partial-state observers for nonlinear systems," IEEE Trans. on Automatic Control, vol. 51, no. 11, pp. 1808-1812, 2006 https://doi.org/10.1109/TAC.2006.884997
  42. K. K. Busawon and M. Saif, "A state observer for nonlinear systems," IEEE Trans. on Automatic Control, vol. 44, pp. 2098-2103, 1999 https://doi.org/10.1109/9.802924
  43. P. Zitek, "Anisochronic state observers for hereditary systems," Int. J. Control, vol. 71, pp. 581-599, 1998 https://doi.org/10.1080/002071798221687
  44. D. W. Gu and F. W. Poon, "A robust state observer scheme," IEEE Trans. on Automatic Control, vol. 46, pp. 1958-1963, 2001 https://doi.org/10.1109/9.975500
  45. P. P. Khargonekar, M. A. Rotea, and E. Baeyens, "Mixed $H_2/H_{\infty}$ filtering," Int. J. Robust Nonlinear Control, vol. 6, no. 6, pp. 313-330, 1996 https://doi.org/10.1002/(SICI)1099-1239(199605)6:4<313::AID-RNC235>3.0.CO;2-8
  46. C. H. Lien, "Robust observer-based control of systems with state perturbations via LMI approach," IEEE Trans. on Automatic Control, vol. 49, no. 8, pp. 1365-1370, 2004 https://doi.org/10.1109/TAC.2004.832660
  47. Y. He, Q. G. Wang, C. Lin, and M. Wu, "Delay-range-dependent stability for systems with timevarying delay," Automatica, vol. 43, pp. 371-376, 2007 https://doi.org/10.1016/j.automatica.2006.08.015
  48. X. Jiang and Q. L. Han, "Delay-dependent robust stability for uncertain linear systems with interval time-varying delay," Automatica, vol. 42, pp. 1059-1065, 2006 https://doi.org/10.1016/j.automatica.2006.02.019
  49. P. Park, "A delay-dependent stability criterion for systems with uncertain time-invariant delays," IEEE Trans. on Automatic Control, vol. 44, pp. 876-877, 1999 https://doi.org/10.1109/9.754838
  50. J. Hale and S. M. Verduyn Lunel, Introduction to Functional Differential Equations, Springer Verlag, New York, NY, 1993
  51. M. G. Safonov, K. C. Goh, and J. H. Ly, "Control system synthesis via bilinear matrix inequalities," Proc. ACC., vol. 1, pp. 45-49, 1994
  52. P. Gahinet, A. Nemirovsky, A. J. Laub, and M. Chilali, LMI Control Toolbox: For Use with Matlab, The MATH Works, Inc., Natik, MA, 1995