Control Architecture Stability: Admissibility in Engineered Control Systems

Control systems regulate the behaviour of engineered processes across domains including robotics, industrial automation, aerospace systems, and infrastructure management. These systems maintain operational stability by coordinating feedback mechanisms that regulate system behaviour under changing conditions. This paper interprets control architecture stability within the Paton System framework as an admissibility condition governing the persistence of engineered control systems. Control architectures remain stable when feedback processes maintain compatibility between system behaviour and operational constraints. When control mechanisms fail to maintain this compatibility, instability may propagate through the system, producing oscillation, runaway behaviour, or systemic failure. Understanding control architecture stability through admissibility boundaries provides a structural interpretation of stability and failure in engineered control systems.