On space-time FEM for time-optimal control problems governed by parabolic equations with mixed and endpoints constraints

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In this paper, we consider a class of time-optimal control problems governed by linear parabolic equations with mixed control-state constraints and end-point constraints, and without Tikhonov regularization term in the objective function. By the finite element method, we discretize the optimal control problem to obtain a sequence of mathematical programming problems in finite-dimensional spaces. Under certain conditions, we show that the optimal solutions of the discrete problems converge to an optimal solution of the original problem. Besides, we show that if the second-order sufficient condition is satisfied, then some error estimates of approximate solutions are obtained.

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