No. 2023.16
Relaxation and asymptotic expansion of controlled stiff differential equations
M. Herty and H. Kouhkouh
Subject: Stiff relaxation system, singular perturbations, asymptotic expansion, Hamilton-Jacobi-Bellman equations, Jin–Xin relaxation

Abstract

The control of relaxation-type systems of ordinary differential equations is investigated using the Hamilton-Jacobi-Bellman equation. First, we recast the model as a singularly perturbed dynamics which we embed in a family of controlled systems. Then we study this dynamics together with the value function of the associated optimal control problem. We provide an asymptotic expansion in the relaxation parameter of the value function. We also show that its solution converges toward the solution of a Hamilton-Jacobi-Bellman equation for a reduced control problem. Such systems are motivated by semi-discretisation of kinetic and hyperbolic partial differential equations. Several examples are presented including Jin-Xin relaxation.

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arXiv:2309.08280
Accepted for publication in International Journal of Control