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15. Integral Sliding Mode Control

Author

Hamayun, Mirza Tariq, Edwards, Christopher, Alwi, Halim, Kacprzyk, Janusz, Series editor, Hamayun, Mirza Tariq, Edwards, Christopher, and Alwi, Halim

Published
2016
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17. Fault Tolerant Control

Author

Hamayun, Mirza Tariq, Edwards, Christopher, Alwi, Halim, Kacprzyk, Janusz, Series editor, Hamayun, Mirza Tariq, Edwards, Christopher, and Alwi, Halim

Published
2016
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18. Editorial

Author

Chen, Lejun, primary, Alwi, Halim, additional, and Edwards, Christopher, additional

Published
2023
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19. Fault tolerant sliding mode control schemes with aerospace applications

Author

Alwi, Halim and Edwards, Christopher

Subjects
629.13
Abstract

The thesis concerns the theoretical development and implemantation of sliding mode schemes for fault tolerant control. The theoretical ideas developed in the thesis have been applied to aerospace systems. In particular, actuator and sensor fault tolerant control schemes have been developed for a high fidelity full nonlinear model of a Boeing 747 aircraft which is a widely researched testbed in the open literature. A key development in this thesis considers sliding mode control allocation schemes for fault tolerant control based on integral action and a model reference framework. Unlike many control allocation schemes in the literature, one of the main contributions of this thesis is the use of actuator effectiveness levels to redistribute the control signals to the remaining healthy actuators when faults/failures occur. A rigorous stability analysis and design procedure is developed from a theoretical perspective for this scheme. A fixed control allocation structure is also rigorously analyzed in the situation when information on actuator effectiveness level is not available. The proposed scheme shows that faults and even certain total actuator failures can be handled directly without reconfiguring the controller. A design of an adaptive gain for the nonlinear component of the sliding mode controller for handling faults is also described. The later chapters of the thesis present the results obtained from real time hardware implementations of the controllers on the 6-DOF SIMONA flight simulator at Delft University of Technology as part of the GARTEUR AG16 programme. The schemes have been evaluated by experienced pilots and the results have shown good performance in both nominal and failure scenarios. A reconstruction of the Bijlmermeer ELAL 1862 scenario on SIMONA using one of the controllers shows that a safe flight and landing is possible with significant reduction in pilot workload when compared with the classical controller.

Published
2008

30. Introduction

Author

Alwi, Halim, Edwards, Christopher, Tan, Chee Pin, Alwi, Halim, Edwards, Christopher, and Pin Tan, Chee

Published
2011
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34. Sliding mode observers for robust fault estimation in linear parameter varying systems.

Author

Chen, Lejun, Edwards, Christopher, Alwi, Halim, Sato, Masayuki, Nateghi, Shamila, and Shtessel, Yuri

Subjects
LINEAR matrix inequalities, MATRIX inequalities, PARAMETER estimation
Abstract

A linear parameter varying sliding mode fault reconstruction scheme is proposed. Compared with other conventional sliding mode observer designs, the estimate emerges quite naturally from the equations governing the sliding motion, and although the process may be viewed as a filtering of the discontinuous injection, there is no phase lag introduced in the process. A semi‐analytic solution to the proposed linear parameter varying sliding mode observer is first discussed. This motivates the structure of the linear matrix inequality formulation which is proposed, and clarifies the class of systems to which the approach is applicable. The linear matrix inequality problem set up minimizes the induced ℒ2$$ {\mathcal{L}}_2 $$ gain between the fault estimate and external disturbances, whilst ensuring linear quadratic performance of the underpinning sliding motion. The proposed scheme has been validated using the Japan Aerospace Exploration Agency's Multi‐Purpose Aviation Laboratory aircraft‐in‐the‐loop platform to demonstrate the design efficacy. [ABSTRACT FROM AUTHOR]

Published
2023
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37. A Fault Tolerant Direct Control Allocation Scheme with Integral Sliding Modes

Author

Hamayun Mirza Tariq, Edwards Christopher, Alwi Halim, and Bajodah Abdulrahman

Subjects
fault tolerant control, integral sliding mode control, linear matrix inequalities, Mathematics, QA1-939, Electronic computers. Computer science, QA75.5-76.95
Abstract

In this paper, integral sliding mode control ideas are combined with direct control allocation in order to create a fault tolerant control scheme. Traditional integral sliding mode control can directly handle actuator faults; however, it cannot do so with actuator failures. Therefore, a mechanism needs to be adopted to distribute the control effort amongst the remaining functioning actuators in cases of faults or failures, so that an acceptable level of closed-loop performance can be retained. This paper considers the possibility of introducing fault tolerance even if fault or failure information is not provided to the control strategy. To demonstrate the efficacy of the proposed scheme, a high fidelity nonlinear model of a large civil aircraft is considered in the simulations in the presence of wind, gusts and sensor noise.

Published
2015
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