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arXiv · 2304.01977

Frequency domain approach for the stability analysis of a fast hyperbolic PDE coupled with a slow ODE

Gonzalo Arias·Swann Marx·Guilherme Mazanti
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Abstract

This paper deals with the exponential stability of systems made of a hyperbolic PDE coupled with an ODE with different time scales, the dynamics of the PDE being much faster than that of the ODE. Such a difference of time scales is modeled though a small parameter $\varepsilon$ multiplying the time derivative in the PDE, and our stability analysis relies on the singular perturbation method. More precisely, we define two subsystems: a reduced order system, representing the dynamics of the full system in the limit $\varepsilon = 0$, and a boundary-layer system, which represents the dynamics of the PDE in the fast time scale. Our main result shows that, if both the reduced order and the boundary-layer systems are exponentially stable, then the full system is also exponentially stable for $\varepsilon$ small enough, and our strategy is based on a spectral analysis of the systems under consideration. Our main result improves a previous result in the literature, which was proved using a Lyapunov approach and required a stronger assumption on the boundary-layer system to obtain the same conclusion.

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Gonzalo Arias, Swann Marx, Guilherme Mazanti. 2023-04-04. Frequency domain approach for the stability analysis of a fast hyperbolic PDE coupled with a slow ODE. https://doi.org/10.1109/cdc49753.2023.10383213

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