Adaptive control of systems with actuator failures pdf

Adaptive flight control systems hold tremendous promise for maintaining the safety of a damaged aircraft and its passengers. By introducing a smooth function, an integrable auxiliary signal, and a bound estimation approach, the. Jul 05, 2012 robust adaptive faulttolerant control for uncertain linear systems with actuator failures. An adaptive control technology for flight safety in the. Focus on the adaptive compensation control for systems with actuator failures, the systems under consideration are from linear systems tao, 2008. Adaptive integraltype sliding mode control for spacecraft.

Neural adaptive compensation control for a class of mimo. Direct adaptive state feedback control schemes are developed for linear timeinvariant plants with actuator failures with characterizations that some of the plant inputs are stuck at some fixed or varying values which cannot be influenced by control action. This paper proposes a control allocation framework where a feedback adaptive signal is designed for a group of redundant actuators and then it is adaptively allocated among all group members. Adaptive tracking control for a class of uncertain. Her research interests include adaptive control of uncertain systems, distributed cooperative control of multiagent systems, fault tolerant control and secure control of cyberphysical systems. In order to enlarge the set of compensable actuator failures, an actuator grouping scheme based on multiple. Researches have also been focused on the combination of smc and adaptive control to develop simple and adaptive robust spacecraft controllers that work for a wide range of practical systems1114. Adaptive control of systems with actuator failures springerlink. The problem of actuator failure compensation is of both practical and. By employing the approximation ability of fuzzy logic systems, an integrated adaptive controller is constructed, which accommodates for both system uncertainties and unknown actuator failures.

Outputfeedback model reference adaptive control of linear continuous state delayed systems in the presence of actuator failures. In this paper, an adaptive faulttolerant control scheme is extended to largescale interconnected systems with actuator failures and external disturbances. A state feedback adaptive control signal is designed for the equivalent effector and adaptively allocated to the member actuators. However, most currently proposed adaptive control methodologies rely on online learning neural networks olnns, which necessarily have the property that the controller is changing during the flight. Adaptive actuator failure compensation control of uncertain nonlinear systems with guaranteed transient performance wei wang, changyun wen school of. Wei wang was the receipt of zhang siying outstanding youth paper award in 20 25 th chinese control and decision conference. This article investigates an asynchronous adaptive faulttolerant control problem for markov jump systems mjss with actuator failures and absolutely unknown nonlinear disturbances. Adaptive state feedback and tracking control of systems with. A state feedback adaptive control signal is designed for the equivalent. The proposed control strategy is feasible under the presupposition that the systems have a nonstrictfeedback structure. Robust adaptive faulttolerant control of stochastic systems with modeling uncertainties and actuator failures wenchuancai, 1 linglingfan, 1 andyongduansong 1,2 school of electronic and information engineering, beijing jiaotong university, beijing, china school of automation, chongqing university, chongqing, china.

Adaptive fuzzy finitetime faulttolerant funnel control. We have developed an adaptive control scheme for systems with unknown actuator failures. Adaptive fuzzy finitetime faulttolerant funnel control of. Multiple model adaptive algorithms for detecting and. This study is concerned with the robust adaptive faulttolerant compensation control problem for linear systems with parameter uncertainty, disturbance and actuator faults including outage, loss. Actuator failure compensation is an important research topic of both theoretical and practical significance. Pdf this paper proposes a control allocation framework where a feedback. Research article robust adaptive faulttolerant control of. Both allocations gains adapt immediately after the failure occurs and settle to a new combination of steadystate values that, together with 2 and 1, guarantee state. Adaptive finite time control of nonlinear systems under. Wei wang was the receipt of zhang siying outstanding youth paper award in. An adaptive actuator failure compensation controller.

In this paper, a robust adaptive actuator failure compensation control scheme is proposed for a class of multi input multi output linear systems with unknown timevarying state delay and in the presence of unknown actuator failures and external disturbance. Adaptive actuator failure compensation control of uncertain. An adaptive control architecture for mitigating sensor and. A new neural adaptive compensation control approach for a class of multiinput multioutput mimo uncertain nonlinear systems with actuator failures is proposed in this paper.

Adaptive tracking control for a class of uncertain nonlinear. Adaptive control of systems with actuator failures. Adaptive control of nonlinear systems in the presence of. Multiple model adaptive estimation mmae methods have been incorporated into the design of a flight control system for the variable in.

Request pdf adaptive control of systems with actuator failures using an adaptive reference model this paper considers model reference adaptive control. Decentralized adaptive faulttolerant control for complex systems with actuator faults adel tellili research unit macs, university of gabes higher institute of technological studies at djerba, tunisia b. However, it is possible that some actuator failures occur intermittently in practice. Pdf adaptive control allocation in the presence of actuator failures. In the adaptive control allocation structure, cooperative actuators are grouped and treated as an equivalent control effector. Hamid reza karimi introduction in industrial applications, actuator or sensor failures usually. Two adaptive control allocation algorithms, guaranteeing closedloop stability and asymptotic state tracking when partial and total loss of control effectiveness occur, are developed. Direct adaptivestate feedback control schemes are developed for linear timeinvariant plants with actuator failures with characterizations that some of the plant inputs are stuck at some fixed or varying values which cannot be influenced by control action. Adaptive control of systems with actuator failures gang. Finally, we provide a numerical example to illustrate the ef.

The actuator gain fault and deviation fault is considered. Robust adaptive faulttolerant control for uncertain linear. We can see that 2 also plays an important role in the compensation of actuator failures. Index termsactuator attacks, adaptive control, cyberphysical systems, partial asymptotic stability, sensor attacks, uniform ultimate boundedness. An adaptive controller is designed for multiinputmultioutput mimo state delay systems in 23 for known state delay and in 24 for unknown time varying state delay. Although the unparameterisable timevarying stuck faults and the upper bounds of disturbances are unknown, the adaptive laws are proposed to.

Introduction actuator failures often cause undesired system behavior and sometimes lead to instability or even catastrophic accidents. Adaptive control schemes are developed for linear timeinvariant plants with actuator failures with characterizations that some of the plant inputs are stuck at some fixed or varying values which. Adaptive backstepping control of uncertain systems with actuator failures, subsystem interactions, and nonsmooth nonlinearities wang, wei, wen, changyun, zhou, jing year. Adaptive control of systems with actuator failures g.

Adaptive control allocation in the presence of actuator. The main contributions are summarized in the following two parts. In this study, a direct adaptive control scheme is developed to solve the robust faulttolerant control problem for linear systems with mismatched parameter uncertainties, disturbances and actuator faults including loss of effectiveness, outage and stuck. The adaptive allocation gains are shown in figure 5. Adaptive backstepping control of uncertain systems with actuator failures, subsystem interactions, and nonsmooth nonlinearities crc press book in practice, actuators often undergo failures and various factors influence its effectiveness. Yangand ye, 2010, multipleinput singleoutput miso nonlinear systems to mimo nonlinear systems with the further research. This article investigates adaptive fuzzy finitetime faulttolerant funnel control of nonlinear systems with actuators failures, which contain outage, loss of effectiveness and stuck modes. Adaptive controls ability to seamlessly compensate for actuator failures. Asynchronous adaptive faulttolerant control for markov jump. Adaptive control of systems with actuator failures using an adaptive reference model article in journal of guidance control and dynamics 353. Gang taos adaptive control books university of virginia. Moreover, by using the designed adaptive law, the values of actuator. Adaptive type2 fuzzy sliding mode controller for siso nonlinear systems subject to actuator faults, international journal of automation and computing, 20, pp. Adaptive control of systems with actuator failures using.

Adaptive control of systems with actuator failures springer. The simplest example is the control of a plant having the form y w,s, 0u 1. Adaptive control for nonlinear uncertain systems with actuator amplitude and rate saturation constraints alexander leonessa dep. Adaptive backstepping control of uncertain systems with actuator failures, subsystem interactions, and nonsmooth nonlinearities wang, wei, wen, changyun, zhou, jing on. Decentralized adaptive faulttolerant control for complex systems with actuator faults. Adaptive control logic and stability proof the adaptive control logic of the actual spacecraft system is stated as. Direct adaptive control of systems with actuator failures. Research article robust adaptive faulttolerant control of stochastic systems with modeling uncertainties and actuator failures wenchuancai, 1 linglingfan, 1 andyongduansong 1,2 school of electronic and information engineering, beijing jiaotong university, beijing, china.

Adaptive control schemes are developed for linear timeinvariant plants with actuator failures with characterizations that some of the plant inputs are stuck at some fixed or varying values which cannot be influenced by control action. The multiple inputs are the outputs of an actuator group that may act either on one control surface or on multiple control surfaces and may fail during operation. An adaptive control scheme for systems with unknown. This study is concerned with the robust adaptive faulttolerant compensation control problem for linear systems with parameter uncertainty, disturbance and actuator faults including outage, loss of effectiveness and stuck. Aiaa guidance, navigation, and control conference january 2017 adaptive control of systems with actuator failures using an adaptive reference model suresh m. Crespo in this paper, a novel adaptive control allocation framework is proposed. Joshi nasa langley research center, hampton, va, 23681, usa the problem of controlling a system in the presence of unknown actuator and sensor faults is addressed.

We consider adaptive compensation for infinite number of actuator failures in the tracking control of uncertain nonlinear systems. The field of adaptive control has addressed the problem of control of dynamic systems with parametric uncertainty 15,17. Adaptive control of systems with actuator failures when an actuator fails chaos or calamity can often ensue it is because the actuator is the final step in the control ean. Asynchronous adaptive eventtriggered tracking control for. Adaptive control allocation in the presence of actuator failures yu liu. Adaptive control for nonlinear uncertain systems with. The adaptive controller is given by u ckt, y, 6, 1. The normal operation case and different failure cases of actuators are unified through a time. Isbn 1852337885 corrections, remarks and references on page 22, 2. Robust adaptive actuator failure compensation of mimo. This scheme, when implemented with true parameters, ensures desired plantmodel matching in the presence of actuator failures, and, when implemented with adaptive parameter estimates, ensures asymptotic output tracking in the presence of unknown plant. Both lockinplace and varyingvalue failures are dealt with.

Adaptive control of systems with actuator failures, aimed at compensating such uncertainties with adaptive tuning of controller parameters based on system. Adaptive control of nonlinear systems in the presence of actuator failures, pp. Adaptive control of systems with actuator failures request pdf. Jun 26, 2012 aiaa guidance, navigation, and control conference january 2017 adaptive control of systems with actuator failures using an adaptive reference model suresh m.

Asynchronous adaptive faulttolerant control for markov. In this paper, a robust adaptive actuator failure compensation controller is designed for a certain type of. Thus the actuators may unawarely change from a failure mode to a normally working mode. Pdf outputfeedback model reference adaptive control of. A robust adaptive faulttolerant controller design method based on stochastic lyapunov theory is developed to accommodate the negative impact on system performance arising from uncertain. Adaptive actuator failure compensation since the actuators redundant for one another may not necessarily share similar. Adaptive control allocation in the presence of actuator failures. Robust adaptive faulttolerant control for linear systems. This section presents an adaptive faulttolerant control logic that incorporates actuator faults and uncertainties. The hidden markov model hmm is used to describe the asynchronization phenomenon between the controller and the modes of the original system. We construct an adaptive controller by combining the common lyapunov function approach and the structural characteristic of neural networks. Adaptive state feedback and tracking control of systems. In most of the existing results on adaptive control of systems with actuator failures, only the cases with. Based on lyapunov stability theory, a state feedback.

Robust adaptive faulttolerant control for uncertain. Adaptive actuator failure compensation actuator failures may cause severe problems in control systems, such as flight control, process control, and power systems. It is assumed that the lower and upper bounds of actuator efficiency factor, the upper bounds of disturbance and the unparametrisable timevarying stuck fault, are unknown. Adaptive control of systems with actuator failures using an. The presented control scheme is not dependent on the exact model of system and actuation failures. Adaptive control of systems with actuator failures gang tao. Pdf robust adaptive fault control for uncertain linear.

An indirect adaptive control scheme in the presence of. Adaptive control of systems with actuator failures centers on counteracting situations in which unknown control inputs become indeterminately unresponsive over an uncertain period of time by adapting the responses of remaining functional actuators. Adaptive compensation for infinite number of actuator. Adaptive state feedback and tracking control of systems with actuator failures abstract. Nov 10, 2010 adaptive control of systems with actuator failures will be of significance to control engineers generally and especially to both academics and industrial practitioners working on safetycritical systems or those in which fullblown fault identification and diagnosis is either too time consuming or too expensive. Summary in this paper, a new adaptive compensation control scheme is proposed for a class of nonlinear systems with unknown parameters and unknown actuator failures. An adaptive control scheme for systems with unknown actuator. Finitetime control, faulttolerant control, funnel control, fuzzy logic systems, adaptive control date received. Cooperative adaptive faulttolerant tracking control for a class of multiagent systems with actuator failures and mismatched parameter uncertainties iet control theory appl.

This paper deals with the problem of faulttolerant control ftc of uncertain stochastic systems subject to modeling uncertainties and actuator failures. Adaptive backstepping control of uncertain systems with. Adaptive faulttolerant control of spacecraft attitude. In the adaptive control allocation structure, cooperative actuators are grouped and treated as an equivalent control e. Robust adaptive actuator failure compensation of mimo systems.

Request pdf direct adaptive control of systems with actuator failures. State of the art and continuing challenges in this paper, the problem of controlling systems with failures and faults is. Adaptive backstepping control of uncertain systems with actuator failures, subsystem interactions, and nonsmooth nonlinearities. An adaptive control technology for flight safety in the presence of actuator anomalies and damage research and teaching output of the mit community. Adaptive type2 fuzzy sliding mode controller for siso. Adaptive control, which can accommodate uncertainties in system parameters, system structure, and environment, is a promising approach to the problem of actuator failure compensation. An indirect adaptive control scheme in the presence of actuator and sensor failures joy z. Decentralized adaptive faulttolerant control for complex. An adaptive control scheme to achieve stability and output tracking is presented for the outputfeedback nonlinear plant with unknown actuator failures.