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SEMINARIO DI EQUAZIONI DIFFERENZIALI E APPLICAZIONI
Mercoledì 2 Aprile 2014 alle 12:15 in aula 1BC50, Thuy T. T. Le, (Università di Padova), terrà un seminario dal titolo "Higher order discrete controllability and the approximation of the minimum time function".
We give sufficient conditions to reach a target for a suitable discretization of a control affine nonlinear dynamics. Such conditions involve higher order Lie brackets of the vector fields driving the state and so the discretization method needs to be of a suitably high order as well. As a result, the discrete minimal time function is bounded by a fractional power of the distance to the target of the initial point. This allows to use methods based on Hamilton-Jacobi theory to prove the convergence of the solution of a fully discrete scheme to the (true) minimum time function, together with error estimates. Finally, we design an approximate suboptimal discrete feedback and provide an error estimate for the time to reach the target through the discrete dynamics generated by this feedback. Our results make use of ideas appearing for the first time in M. Bardi M. Falcone (An approximation scheme for the minimum time function SIAM J. Control Optim. 28 (1990)) and now extensively described in M. Falcone R. Ferretti, (Semi-Lagrangian Approximation Schemes for Linear and Hamilton-Jacobi Equations , SIAM (2014)). Joint work with Giovanni Colombo.
Rif. Int. M. Bardi, E. Feleqi, G. Colombo.