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Polynomial decay rate estimate for bilinear parabolic systems under weak observability condition

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Abstract

In this paper, we shall study the stability for distributed bilinear systems on a Hilbert state space that can be decomposed in two subspaces: unstable finite-dimensional and stable infinite-dimensional with respect to the evolution generator. Then, we shall show under a weaker observability assumption that stabilizing such a system with a feedback control of the form \(p_{r}(t)=-\Vert y(t)\Vert ^{-r}\langle y(t),By(t)\rangle \) for \(r<2\), reduces stabilizing only its projection on the finite-dimension subspace which make the whole system stable. To this end, we shall propose a new family of continuous feedback controls that guarantee the uniform stabilizability with an explicit optimal decay rate estimate of the stabilized state. Two illustrating examples and simulations are provided.

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Acknowledgments

The authors would like to thank the anonymous referee for the very thorough reading of the paper and many helpful and constructive comments.

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Tsouli, A., Boutoulout, A. Polynomial decay rate estimate for bilinear parabolic systems under weak observability condition. Rend. Circ. Mat. Palermo 64, 347–364 (2015). https://doi.org/10.1007/s12215-015-0204-z

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