A Double-Loop Control Approach Applied to Damage-Tolerant Active Control

Helói Genari¹; Nazih Mechbal²; Gérard Coffignal²; Eurípedes Nóbrega¹

¹ UNICAMP; ² Arts et Métiers ParisTech

doi:10.20906/CPS/COB-2015-2294

Resumo

This paper presents a double-loop control technique for vibration control of a smart flexible structure subject to damage. Damage-tolerant active control is an adaptation of fault-tolerant control that includes damage information in the controller design. Controllers are typically designed using damage-free structure models, without considering due changes, despite damage usually implies progressive severity increase and consequent performance deterioration. To overcome this control limitation, an additional adaptive controller is proposed to compose a double-loop control system in order to mitigate damage effects. In this work, a linear-quadratic regulator is designed for a healthy structure, together with an adaptive controller that ensures an acceptable performance level, compensating eventual model changes. An adaptive law updates online the controller parameters, based on state-tracking technique. A tall building model is used as a case study structure, including health and damage conditions, to examine the control strategy. Results show the methodology effectiveness here proposed.

Palavras-chave: damage-tolerant active control; active vibration control; adaptive control; LQR; smart structure