Year: 2026
Type: preprint
Abstract: We derive an explicit bound for the L2-L2-gain of linear time-invariant systems whose output is a quadratic function of the state and the input. Such systems appear naturally in many areas, for example for port-Hamiltonian systems, optimal-control, and stochastic problems. In case the output is purely quadratic in the state, the bound is determined by the supremum over $ω\in\mathbb R$ of the L2-norms of the bivariate transfer function restricted to the anti-diagonals $\{(s,\, iω-s)\mid s\in i\mathbb R\}$ of the frequency domain $i\mathbb R\times i\mathbb R $. Further, we show how the bound can be computed by solving linear matrix equations. This result provides a practical tool for assessing and reducing quadratic-output models.
Source: arXiv (Cornell University)
Author: Hillebrecht, Birgit
Institution: Karlsruhe Institute of Technology
Language: English
Subfield: Control and Systems Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7167022678