THE EFFECT OF SMALL DELAYS IN THE FEEDBACK LOOP ON THE STABILITY OF NEUTRAL SYSTEMS

摘要

It is well-known that exponential stabilization of a neutral system with unstable difference operator is only possible by allowing for control laws containing derivative feedback. We show that closed-loop stability of a neutral system with unstable open-loop difference operator obtained by applying a derivative feedback scheme is extremely sensitive to arbitrarily small time delays in the feedback loop. [References: 25]