QFT applied to fault tolerant flight control system design

Keating, M.S.; Pachter, Meir; Houpis, Constantine H.

doi:10.1109/acc.1995.529234

Cited by 9 publications

(7 citation statements)

References 1 publication

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“…The QFT method takes into account quantitative information on the variability of the plant, the robust performance requirements, the tracking performance specifications, the expected disturbance amplitude and its attenuation requirements [358]. The feasibility of utilizing a robust QFT controller that meets flying quality specifications for an aircraft subject to control surface failures has been investigated by [155]. A reconfigurable flight control system that uses the series of a robust QFT controller and an adaptive filter has been presented in [297].…”

Section: Quantitative Feedback Theory (Qft)mentioning

confidence: 99%

Advances in Gain-Scheduling and Fault Tolerant Control Techniques

Rotondo¹

2018

Springer Theses

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This thesis presents some contributions to the state-of-the-art of the fields of gainscheduling and fault tolerant control (FTC).In the area of gain-scheduling, the connections between the linear parameter varying (LPV) and Takagi-Sugeno (TS) paradigms are analyzed, showing that the methods for the automated generation of models by nonlinear embedding and by sector nonlinearity, developed for one class of systems, can be easily extended to deal with the other class. Then, two measures, based on the notions of overboundedness and region of attraction estimates, are proposed in order to compare different models and choose which one can be considered the best one. Later, the problem of designing state-feedback controllers for LPV systems has been considered, providing two main contributions. First, robust LPV controllers that can guarantee some desired performances when applied to uncertain LPV systems are designed, by using a double-layer polytopic description that takes into account both the variability due to the varying parameter vector and the uncertainty. Then, the idea of designing the controller in such a way that the required performances are scheduled by the varying parameters is explored, which provides an elegant way to vary online the behavior of the closed-loop system. In both cases, the problem reduces to finding a solution to a finite number of linear matrix inequalities (LMIs), which can be done efficiently using the available solvers.In the area of fault tolerant control, the thesis first shows that the aforementioned double-layer polytopic framework can be used for FTC, in such a way that different strategies (passive, active and hybrid) are obtained depending on the amount of available information. Later, an FTC strategy for LPV systems that involves a reconfigured reference model and virtual actuators is developed. It is shown that by including the saturations in the reference model equations, it is possible to design a model reference FTC system that automatically retunes the reference states whenever the system is affected by saturation nonlinearities. In this way, a graceful performance degradation in presence of actuator saturations is incorporated in an elegant way. Finally, the problem of FTC of unstable LPV systems subject to actuator saturations is considered. In this case, the design of the virtual actuator is performed in such a way that the convergence of the state trajectory to zero is assured despite the saturations and the appearance of faults. Also, it is shown that it is possible to obtain some guarantees about the tolerated delay between the fault occurrence and its isolation, and that the nominal controller can be designed so as to maximize the tolerated delay.i Resum Aquesta tesi presenta diverses contribucions a l'estat de l'art del control per planificació del guany i del control tolerant a fallades (FTC).Pel que fa al control per planificació del guany, s'analitzen les connexions entre els paradigmes dels sistemes lineals a paràmetres variants en el temps (LPV) i d...

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Section: Quantitative Feedback Theory (Qft)mentioning

confidence: 99%

Advances in Gain-Scheduling and Fault Tolerant Control Techniques

Rotondo¹

2018

Springer Theses

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“…The methods generally used in the design of such control systems are: quantitative feedback theory [56,57], frequency domain H ∞ [58], robust design based on "4 parameter" controller [10], sliding mode control [59,60], and linear matrix inequalities [61]. The application of sliding mode control to reconfigurable flight control problems as with other applications has a tendency to produce severe chattering.…”

Section: Control Reconfigurationmentioning

confidence: 99%

Structural Technology Evaluation and Analysis Program (STEAP). Delivery Order 0037: Prognosis-Based Control Reconfiguration for an Aircraft with Faulty Actuator to Enable Performance in a Degraded State

Mahulkar¹

2010

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“…From an uncertainty viewpoint, the uncertainty range has been increased to 48 structured plant models in the full envelope. The time responses of the original controller, (2), under the 48 flight conditions are depicted in Fig. 9, which reveals even larger and worse variations in the performance.…”

Section: Robust/fault-tolerant Controller Designmentioning

confidence: 99%

“…In the last ten years, the application of QFT in FCS design has been studied extensively [2]- [6]. Much of this flight control research was supported by the Air Force Research Laboratory of Wright-Patterson Air Force Base, Dayton, OH [2]- [5], which has culminated in the design and first successful flight testing of a QFT FCS.…”

Section: Introductionmentioning

confidence: 99%

QFT-based robust/fault-tolerant flight control design for a remote pilotless vehicle

Wu¹,

Grimble²,

Wei³

2000

IEEE Trans. Contr. Syst. Technol.

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Quantitative feedback theory (QFT) was applied successfully to enhance the robust stability and tracking performance of the pitch flight control system for a remote pilotless vehicle (RPV), within its full flight envelope. The influence of control surface loss or damage to the dynamic derivatives of the aircraft model can be treated as an extension of the model uncertainty robustness problem. QFT is applied to the analysis and design of the fault tolerant flight control system allowing for possible control surface damages. Index Terms-Fault tolerance, flight control, quantitative feedback theory (QFT), robustness.

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QFT applied to fault tolerant flight control system design

Cited by 9 publications

References 1 publication

Advances in Gain-Scheduling and Fault Tolerant Control Techniques

Advances in Gain-Scheduling and Fault Tolerant Control Techniques

Structural Technology Evaluation and Analysis Program (STEAP). Delivery Order 0037: Prognosis-Based Control Reconfiguration for an Aircraft with Faulty Actuator to Enable Performance in a Degraded State

QFT-based robust/fault-tolerant flight control design for a remote pilotless vehicle

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