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Robustness of constant-delay predictor feedback for in-domain stabilization of reaction-diffusion PDEs with time- and spatially-varying input delays

Abstract : This paper discusses the in-domain feedback stabilization of reaction-diffusion PDEs with Robin boundary conditions in the presence of an uncertain time-and spatially-varying delay in the distributed actuation. The proposed control design strategy consists of a constant-delay predictor feedback designed based on the known nominal value of the control input delay and is synthesized on a finite-dimensional truncated model capturing the unstable modes of the original infinite-dimensional system. By using a small-gain argument, we show that the resulting closed-loop system is exponentially stable provided that the variations of the delay around its nominal value are small enough. The proposed proof actually applies to any distributed-parameter system associated with an unbounded operator that 1) generates a $C_0$-semigroup on a weighted space of square integrable functions over a compact interval; and 2) is self-adjoint with compact resolvent.
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Submitted on : Wednesday, November 11, 2020 - 11:28:10 AM
Last modification on : Thursday, October 21, 2021 - 3:12:42 AM
Long-term archiving on: : Friday, February 12, 2021 - 6:21:58 PM

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Hugo Lhachemi, Christophe Prieur, Robert Shorten. Robustness of constant-delay predictor feedback for in-domain stabilization of reaction-diffusion PDEs with time- and spatially-varying input delays. Automatica, Elsevier, 2021, 123, pp.109347. ⟨10.1016/j.automatica.2020.109347⟩. ⟨hal-02999899⟩

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