A Modal H ∞ Control Methodology for Damage-Tolerant Active Control

Genari, Helói; Mechbal, Nazih; Cofflgnal, Gérard; Nóbrega, Eurípedes Guilherme de Oliveira

doi:10.1016/j.ifacol.2015.09.603

Cited by 4 publications

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“…Performance and robustness of vibration control techniques are dependent on model accuracy [24,25]. Damage produces structural dynamic changes, implying additional model uncertainties [26]. Therefore, most control methods do not guarantee an acceptable performance after a damage occurrence.…”

Section: Introductionmentioning

confidence: 99%

A modal H∞-norm-based performance requirement for damage-tolerant active controller design

Genari

Mechbal

Coffignal

et al. 2017

Journal of Sound and Vibration

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Damage-tolerant active control (DTAC) is a recent research area that encompasses control design methodologies resulting from the application of fault-tolerant control methods to vibration control of structures subject to damage. The possibility of damage occurrence is not usually considered in the active vibration control design requirements. Damage changes the structure dynamics, which may produce unexpected modal behavior of the closed-loop system, usually not anticipated by the controller design approaches. A modal ∞ H norm and a respective robust controller design framework were recently introduced, and this method is here extended to face a new DTAC strategy implementation. Considering that damage affects each vibration mode differently, this paper adopts the modal ∞ H norm to include damage as a design requirement. The basic idea is to create an appropriate energy distribution over the frequency range of interest and respective vibration modes, guaranteeing robustness, damage tolerance, and adequate overall performance, taking into account that it is common to have previous knowledge of the structure regions where damage may occur during its operational life. For this purpose, a structural health monitoring technique is applied to evaluate modal modifications caused by damage. This information is used to create modal weighing matrices, conducting to the modal ∞ H controller design. Finite element models are adopted for a case study structure, including different damage severities, in order to validate the proposed control strategy. Results show the effectiveness of the proposed methodology with respect to damage tolerance.

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Section: Introductionmentioning

confidence: 99%

A modal H∞-norm-based performance requirement for damage-tolerant active controller design

Genari

Mechbal

Coffignal

et al. 2017

Journal of Sound and Vibration

Self Cite

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“…Unfortunately, they are opposite to each other, demanding in general a compromise to balance the design requirements. Considering a flexible structure submitted to a regular active vibration controller, performance degradation may be expected in the case of damage occurrence [36]. Regular controllers are not a good solution for structures subject to damage, for instance, considering to ensure safety in an aircraft or in a civil structure.…”

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confidence: 99%

A reconfigurable damage-tolerant controller based on a modal double-loop framework

Genari

Mechbal

Coffignal

et al. 2017

Mechanical Systems and Signal Processing

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E.G.O. Nóbrega).performance and robustness for controlled systems. However, SHM and AVC methods are independently designed in general, despite the fact that damage may significantly affect the AVC performance. Aiming to overcome the controller performance decline due to damage, this paper presents a framework to design damage-tolerant active controllers for noncollocated flexible structures, based on a novel double-loop modal controller, which may be adaptively reconfigured in real time. The proposed methodology is inserted into a wide multidisciplinary, involving concepts of AVC, modal control, fault-tolerant control, adaptive control, and SHM, in order to mitigate structural damage effects.The integration between SHM and vibration control techniques has been receiving considerable attention in recent decades [10][11][12][13]. Initially, SHM and control techniques were integrated only in the design phase, with the respective strategy consisting in the simultaneous design of the SHM and control modules [14][15][16]. These two subsystems were independently operated in the beginning and then, responding to challenges in the civil engineering area, progress has been made in improving the integration approach. New semi-active controllers have been proposed based on magneto-rheological dampers, using the output of the SHM module to update the respective controller parameters [17][18][19][20]. However, the increasing demands of larger and lightweight structures with high structural performance lead to the evolution of AVC methods and applications. Despite semi-active controllers intrinsic stability, which represents an advantage for several cases, AVC strategies provide better performance than the passive and the semi-active approaches in structural vibration control [21,22]. After almost two decades of research, the integration of the SHM and the AVC approaches is still a challenge, and regular AVC methods rarely consider, as a design requirement, damage effect mitigation in structural vibrations.Damage-tolerant active control (DTAC) is a recent research area that has intersections with both fault-tolerant control (FTC) and AVC areas. Specific fault detection and isolation techniques are used by fault-tolerant controllers to provide online parameter adaptation aiming to maintain an adequate performance for controlled systems [23][24][25]. In the same way, DTAC methods use SHM to design controllers presenting damage-tolerant performance. DTAC methods may be considered an extension of FTC, focusing fundamentally on structural vibration control and aiming to expand the applicability of modern smart structures. However, adapting FTC methods to face damage-induced vibration in flexible structures leads to new challenges. The infinite number of structural vibration modes, which constitutes the beginning of the DTAC research area, demands a controller robustness that is complicated by the dynamic changes due to damage perturbation [3]. The literature regarding vibration control of structures subject to damage is limited. Cha...

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An adaptive framework applied to structural health monitoring and damage-tolerant active control of smart structures

Ortolano

Genari

Nóbrega

2022

J Braz. Soc. Mech. Sci. Eng.

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A Modal H ∞ Control Methodology for Damage-Tolerant Active Control

Cited by 4 publications

References 4 publications

A modal H∞-norm-based performance requirement for damage-tolerant active controller design

A modal H∞-norm-based performance requirement for damage-tolerant active controller design

A reconfigurable damage-tolerant controller based on a modal double-loop framework

An adaptive framework applied to structural health monitoring and damage-tolerant active control of smart structures

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