Decentralised vibration control

Abstract

The decentralised robust reliable saturation controller is designed using the state-space Riccati-based approach to achieve closed-loop controlled system stability, robustness against system uncertainties, reliability against partial actuator failures and optimality by minimisation of user-defined performance index for the controlled linear uncertain faulty systems under seismic excitations. System uncertainties due to variations in damping and stiffness, as well as actuator failures within a predefined set are considered. Using state-space approach, the global system is state-decentralised into inter-connected local subsystems for local decentralised controls. The decentralised controllers use only local information for independent local control of subsystems. The results show decentralised robust reliable controls perform much better than decentralised nominal controls, with comparable performance to central robust reliable controls, even when system uncertainties and/or device failures do occur. Robust reliable controls consistently perform better than nominal controls for both linear nominal and uncertain systems under both central and decentralised control systems.