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Actuator Failure

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Gang Tao – One of the best experts on this subject based on the ideXlab platform.

  • Adaptive Actuator Failure Compensation Control Schemes for Uncertain Noncanonical Neural-Network Systems.
    IEEE transactions on cybernetics, 2020
    Co-Authors: Guanyu Lai, Gang Tao, Yun Zhang, Zhi Liu, Junwei Wang
    Abstract:

    In this article, direct adaptive Actuator Failure compensation control is investigated for a class of noncanonical neural-network nonlinear systems whose relative degrees are implicit and parameters are unknown. Both the state tracking and output tracking control problems are considered, and their adaptive solutions are developed which have specific mechanisms to accommodate both Actuator Failures and parameter uncertainties to ensure the closed-loop system stability and asymptotic state or output tracking. The adaptive Actuator Failure compensation control schemes are derived for noncanonical nonlinear systems with neural-network approximation, and are also applicable to general parametrizable noncanonical nonlinear systems with both unknown Actuator Failures and unknown parameters, solving some key technical issues, in particular, dealing with the system zero dynamics under uncertain Actuator Failures. The effectiveness of the developed adaptive control schemes is confirmed by simulation results from an application example of speed control of dc motors.

  • ASCC – Adaptive Actuator Failure Compensation for Multivariable Systems Using A Multiple-Model Design *
    , 2019
    Co-Authors: Chang Tan, Gang Tao, Hui Yang, Lu Rongxiu
    Abstract:

    This paper develops a new adaptive compensation control scheme for multivariable systems with some unknown Actuator Failures, based on a multiple-model approach. Such a scheme can handle possible structure changes from Actuator Failures and uncertain parameter changes of multivariable systems. Multiple parametrizations are employed for the system under different Actuator Failure patterns, each for design of an adaptive compensation control signal for individual pattern. Performance indexes are formed based on normalized estimation errors for all Failure patterns and the control signal with best performance is decided to control the system. Such an adaptive multiple-mode design has the potential of fast Failure compensation an uncertainty adaptation. A complete design procedure is presented, with clarification and analysis of some key system properties. Simulation results are used to demonstrate the effectiveness of the designed adaptive Failure compensation control scheme.

  • adaptive Actuator Failure compensation for multivariable systems using a multiple model design
    Asian Control Conference, 2019
    Co-Authors: Chang Tan, Gang Tao, Hui Yang
    Abstract:

    This paper develops a new adaptive compensation control scheme for multivariable systems with some unknown Actuator Failures, based on a multiple-model approach. Such a scheme can handle possible structure changes from Actuator Failures and uncertain parameter changes of multivariable systems. Multiple parametrizations are employed for the system under different Actuator Failure patterns, each for design of an adaptive compensation control signal for individual pattern. Performance indexes are formed based on normalized estimation errors for all Failure patterns and the control signal with best performance is decided to control the system. Such an adaptive multiple-mode design has the potential of fast Failure compensation an uncertainty adaptation. A complete design procedure is presented, with clarification and analysis of some key system properties. Simulation results are used to demonstrate the effectiveness of the designed adaptive Failure compensation control scheme.

S M Joshi – One of the best experts on this subject based on the ideXlab platform.

  • adaptive Actuator Failure compensation for nonlinear mimo systems with an aircraft control application
    Automatica, 2007
    Co-Authors: Xidong Tang, S M Joshi
    Abstract:

    A direct adaptive approach is developed for control of a class of multi-input multi-output (MIMO) nonlinear systems in the presence of uncertain Failures of redundant Actuators. An adaptive Failure compensation controller is designed which is capable of accommodating uncertainties in Actuator Failure time instants, values and patterns. A realistic situation is studied with fixed grouping of Actuators and proportional actuation within Actuator groups. The adaptive control system is analyzed, to show its desired stability and asymptotic tracking properties in the presence of Actuator Failure uncertainties. As an application, such an adaptive controller is used for Actuator Failure compensation of a twin otter aircraft longitudinal model, with design conditions verified and control structure and adaptive laws developed for a nonlinear aircraft dynamic model. The effectiveness of adaptive Failure compensation is demonstrated by simulation results.

  • Adaptive output feedback Actuator Failure compensation for a class of non-linear systems
    International Journal of Adaptive Control and Signal Processing, 2005
    Co-Authors: Xidong Tang, Gang Tao, S M Joshi
    Abstract:

    An adaptive compensation control scheme using output feedback is designed and analysed for a class of non-linear systems with state-dependent non-linearities in the presence of unknown Actuator Failures. For a linearly parameterized model of Actuator Failures with unknown Failure values, time instants and pattern, a robust backstepping-based adaptive non-linear controller is employed to handle the system Failure, parameter and dynamics uncertainties. Robust adaptive parameter update laws are derived to ensure closed-loop signal boundedness and small tracking errors, in general, and asymptotic regulation, in particular. An application to controlling the angle of attack of a non-linear hypersonic aircraft dynamic model in the presence of elevator segment Failures is studied and simulation results show that the developed adaptive control scheme has desired Actuator Failure compensation performance. Copyright © 2004 John Wiley & Sons, Ltd.

  • adaptive Actuator Failure compensation control for mimo systems
    International Journal of Control, 2004
    Co-Authors: Shuhao Chen, Gang Tao, S M Joshi
    Abstract:

    Two adaptive Failure compensation control schemes based on MRAC are developed for a class of MIMO LTI systems with unknown Actuator Failures. An effective controller structure is proposed to achieve the desired plant-model output matching when implemented with matching parameters. Design conditions are specified for such nominal plant-model output matching. Two adaptive versions of the nominal controller are proposed and stable adaptive laws are derived for updating the controller parameters when plant parameters and Failure parameters are unknown. All closed-loop signals are bounded and the plant outputs track the given reference outputs asymptotically, despite the uncertainties in Actuator Failures and plant parameters. Simulation results for an aircraft lateral dynamic model verify the desired adaptive control system performance in the presence of unknown rudder and aileron Failures.

Xidong Tang – One of the best experts on this subject based on the ideXlab platform.

  • adaptive Actuator Failure compensation for nonlinear mimo systems with an aircraft control application
    Automatica, 2007
    Co-Authors: Xidong Tang, S M Joshi
    Abstract:

    A direct adaptive approach is developed for control of a class of multi-input multi-output (MIMO) nonlinear systems in the presence of uncertain Failures of redundant Actuators. An adaptive Failure compensation controller is designed which is capable of accommodating uncertainties in Actuator Failure time instants, values and patterns. A realistic situation is studied with fixed grouping of Actuators and proportional actuation within Actuator groups. The adaptive control system is analyzed, to show its desired stability and asymptotic tracking properties in the presence of Actuator Failure uncertainties. As an application, such an adaptive controller is used for Actuator Failure compensation of a twin otter aircraft longitudinal model, with design conditions verified and control structure and adaptive laws developed for a nonlinear aircraft dynamic model. The effectiveness of adaptive Failure compensation is demonstrated by simulation results.

  • Adaptive output feedback Actuator Failure compensation for a class of non-linear systems
    International Journal of Adaptive Control and Signal Processing, 2005
    Co-Authors: Xidong Tang, Gang Tao, S M Joshi
    Abstract:

    An adaptive compensation control scheme using output feedback is designed and analysed for a class of non-linear systems with state-dependent non-linearities in the presence of unknown Actuator Failures. For a linearly parameterized model of Actuator Failures with unknown Failure values, time instants and pattern, a robust backstepping-based adaptive non-linear controller is employed to handle the system Failure, parameter and dynamics uncertainties. Robust adaptive parameter update laws are derived to ensure closed-loop signal boundedness and small tracking errors, in general, and asymptotic regulation, in particular. An application to controlling the angle of attack of a non-linear hypersonic aircraft dynamic model in the presence of elevator segment Failures is studied and simulation results show that the developed adaptive control scheme has desired Actuator Failure compensation performance. Copyright © 2004 John Wiley & Sons, Ltd.

  • robust and adaptive Actuator Failure compensation designs for a rocket fairing structural acoustic model
    IEEE Transactions on Aerospace and Electronic Systems, 2004
    Co-Authors: Xidong Tang, Gang Tao, Lingfeng Wang, John A. Stankovic
    Abstract:

    The Actuator Failure compensation problem is formulated for active vibration control of a rocket fairing structural-acoustic model with unknown Actuator Failures. Performance of a nominal optimal control scheme in the presence of Actuator Failures is studied to show the need of effective Failure compensation. A robust control scheme and two adaptive control schemes are developed, which are able to ensure the closed-loop system signal boundedness in the presence of Actuator Failures whose Failure pattern and values are unknown. The adaptive scheme for parameterizable Failures ensures asymptotic stability despite Failure uncertainties. Simulation results verified their Failure compensation effectiveness.