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Inverse optimal design of input-to-state stabilizing nonlinear controllers

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2 Author(s)
M. Krstic ; Dept. of Mech. Eng., Maryland Univ., MD, USA ; Zhong-Hua Li

We show that input-to-state stabilizability (as defined by Sontag,1989, 1995) is both necessary and sufficient for the solvability of a Hamilton-Jacobi-Isaacs equation associated with a meaningful differential game problem similar to, but more general than, the “nonlinear H” problem. The significance of the result stems from the fact that constructive solutions to the input-to-state stabilization problem are available (presented in the paper) and that, as shown here, inverse optimal controllers possess margins on input-to-state stability against a certain class of input unmodeled dynamics. Rather than completion of squares, the main tools in our analysis are Legendre-Fenchel transformations and the general form of Young's inequality

Published in:

IEEE Transactions on Automatic Control  (Volume:43 ,  Issue: 3 )