Spatial<i>H</i><sub>∞</sub>approach to damage-tolerant active control

Mechbal, Nazih; Nóbrega, Eurípedes Guilherme de Oliveira

doi:10.1002/stc.1729

Cited by 9 publications

(11 citation statements)

References 43 publications

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“…The difference between the newly selected output, (7), and the output widely used in other studies, (4), is that the output of (7) has a direct-feedthrough term, D. The structure of the EID-based control system is modified to be the one shown in Fig. 3 so as to make it easy to implement an EID estimate for a plant with a direct-feedthrough term.…”

Section: Structural Model and Modified-eid-based Asc Systemmentioning

confidence: 99%

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Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

Miyamoto

She

2018

2018 IEEE 27th International Symposium on Industrial Electronics (ISIE)

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This paper presents a new control system that suppresses not only the relative displacement, but also the absolute acceleration of a structure. It uses the modifiedequivalent-input-disturbance (MEID) approach to design a control system. The control of the absolute acceleration is very important to protect properties and people from a large earthquake, and has been considered to be a difficult problem. To deal with this problem, this study constructed a modified EID control system to achieve satisfactory control performance. Index Terms-active structural control, equivalent input disturbance (EID), absolute acceleration

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Section: Structural Model and Modified-eid-based Asc Systemmentioning

confidence: 99%

“…Many methods have been used to design an ASC system, for example, the modern control theory [3], the H∞ control [4], and preview control [5]. Most of the control systems use the structure of one degree of freedom (DOF).…”

Section: Introductionmentioning

confidence: 99%

Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

Miyamoto

She

2018

2018 IEEE 27th International Symposium on Industrial Electronics (ISIE)

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“…This constitutes a multidisciplinary methodology, merging concepts of vibration control, modal control, fault-tolerant control, and structural health monitoring in order to cope with structural damage effects. Damage-tolerant active control (DTAC) is a research area arisen from intense investigation to bring more secure and efficient operation to flexible structures, aiming for extension of their life cycle as well [8]. DTAC strategies were recently proposed by Mechbal and Nóbrega [9], merging concepts of vibration control and fault-tolerant control areas.…”

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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“…In particular, structural damage mitigation is prone to take advantage of the smart trend. Current smart structures may embed sensors, actuators, and even digital processors, which can be used to diagnose and to act in order to detect and compensate possible damage effects [1][2][3]. These structures may indeed present a sophisticated computational level, allowing real-time functions like structural health monitoring (SHM) and active vibration control (AVC).…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

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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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SpatialH_∞approach to damage-tolerant active control

Cited by 9 publications

References 43 publications

Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

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

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SpatialH∞approach to damage-tolerant active control

Cited by 9 publications

References 43 publications

Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

Active Structural Control with Suppression of Absolute Acceleration Using Equivalent-Input-Disturbance Approach

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

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SpatialH_∞approach to damage-tolerant active control