Using delays for prescribed-time static output feedback stabilization of LTI controllable and observable systems

Kang-Kang Zhang; Emilia Fridman

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arXiv · 2610.38417

Using delays for prescribed-time static output feedback stabilization of LTI controllable and observable systems

Kang-Kang Zhang·Emilia Fridman

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Abstract

This paper addresses a stabilization problem: can every controllable and observable LTI system be stabilized by static output feedback? To the best of our knowledge, we provide, for the first time, a solution to this problem. Furthermore, the proposed design achieves prescribed-time convergence to the origin, with the convergence time arbitrarily assigned a priori and independently of the initial condition. Two static output-feedback methods are developed. The first employs multiple artificial output delays with smooth time-varying gains and provides an explicit gain construction for every controllable and observable LTI system, based on a generalized controllability--observability Gramian introduced in this paper. The second combines constant-gain feedback of the current output with time-varying-gain feedback of a single artificially delayed output and also applies to every controllable and observable LTI system. Its simpler structure requires auxiliary parameters whose existence is guaranteed but whose explicit construction is not provided for general MIMO systems; for SISO systems, the constant current-output gain can be readily selected. The multiple-delay design is further extended to known bounded and fast-varying (without any constraints on the delay derivative) measurement delays, yielding fixed-time stabilization under a corresponding rank condition, with an assignable settling-time bound greater than three times the delay bound. For unknown constant measurement delays, fixed-time stabilization is established for systems with nilpotent state matrices. A numerical implementation is also presented. Numerical examples involving nonminimum-phase, flexible-structure, and cart--pole systems illustrate the effectiveness of the proposed methods.

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BibTeX RIS

Kang-Kang Zhang, Emilia Fridman. 2026-10-28. Using delays for prescribed-time static output feedback stabilization of LTI controllable and observable systems. https://arxiv.org/abs/2610.38417

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