An adaptive actuator failure compensation scheme is proposed for attitude tracking control of spacecraft with unknown disturbances and uncertain actuator failures. A new feature of this adaptive control scheme is the ...An adaptive actuator failure compensation scheme is proposed for attitude tracking control of spacecraft with unknown disturbances and uncertain actuator failures. A new feature of this adaptive control scheme is the adaptation of the failure pattern parameter estimates, as well as the failure signal parameter estimates, for direct adaptive actuator failure compensation. Based on an adaptive backstepping control design, the estimates of the disturbance parameters are used to solve the disturbance rejection problem. The unknown disturbances are compensated completely with the stability of the whole closed-loop system. The scheme is not only able to accommodate uncertain actuator failures, but also robust against unknown external disturbances. Simulation results verify the desired adaptive actuator failure compensation performance.展开更多
Numerous complex nonlinear systems in the real-world constantly suffer from random noises,which contribute to the enormous challenge of system control.Additionally,unknown powers in nonlinear systems always lead to th...Numerous complex nonlinear systems in the real-world constantly suffer from random noises,which contribute to the enormous challenge of system control.Additionally,unknown powers in nonlinear systems always lead to the inapplicability of many reported control methods.This article investigates the control issue of stochastic systems which contain complicated nonlinearities and unknown system powers.With the newly constructed Lyapunov function,as well as the control algorithm presented in this work,the authors successfully obtain a controller so that the closed-loop system is semiglobally finite-time stable in probability(SGFSP).Besides,the system output can trackthe reference signal fast.The presented method significantly enlarges the range of application for nonlinear systems.The presented strategy is successfully applied to the liquid-level system.展开更多
An adaptive actuator failure compensation control scheme is developed using an indirect adaptive control method,by calculating the controller parameters from adaptive estimates of system parameters and actuator failur...An adaptive actuator failure compensation control scheme is developed using an indirect adaptive control method,by calculating the controller parameters from adaptive estimates of system parameters and actuator failure parameters.A key technical issue is how to deal with the actuator failure uncertainties such as failure pattern,time and values.A complete parametrization covering all possible failures is used to solve this issue for adaptive parameter estimation.A simultaneous mapping from the estimated system/failure parameters to the controller parameters is employed to make the control system capable of ensuring the desired system performance under failures,which is verified by simulation results.展开更多
基金supported by the National Natural Science Foundation of China(6137413061374116)+2 种基金the Nanjing University of Aeronautics and Astronautics Research Foundation(NP2013303)the Funding of Jiangsu Innovation Program for Graduate(CXLX13 157)the Fundamental Research Funds for the Central Universities
文摘An adaptive actuator failure compensation scheme is proposed for attitude tracking control of spacecraft with unknown disturbances and uncertain actuator failures. A new feature of this adaptive control scheme is the adaptation of the failure pattern parameter estimates, as well as the failure signal parameter estimates, for direct adaptive actuator failure compensation. Based on an adaptive backstepping control design, the estimates of the disturbance parameters are used to solve the disturbance rejection problem. The unknown disturbances are compensated completely with the stability of the whole closed-loop system. The scheme is not only able to accommodate uncertain actuator failures, but also robust against unknown external disturbances. Simulation results verify the desired adaptive actuator failure compensation performance.
基金supported by the Fundamental Research Program of Shanxi Province under Grant Nos.202203021221004 and 202303021221185。
文摘Numerous complex nonlinear systems in the real-world constantly suffer from random noises,which contribute to the enormous challenge of system control.Additionally,unknown powers in nonlinear systems always lead to the inapplicability of many reported control methods.This article investigates the control issue of stochastic systems which contain complicated nonlinearities and unknown system powers.With the newly constructed Lyapunov function,as well as the control algorithm presented in this work,the authors successfully obtain a controller so that the closed-loop system is semiglobally finite-time stable in probability(SGFSP).Besides,the system output can trackthe reference signal fast.The presented method significantly enlarges the range of application for nonlinear systems.The presented strategy is successfully applied to the liquid-level system.
基金supported by the US National Science Foundation (ECS0601475)the National Natural Science Foundation of China (60904042)
文摘An adaptive actuator failure compensation control scheme is developed using an indirect adaptive control method,by calculating the controller parameters from adaptive estimates of system parameters and actuator failure parameters.A key technical issue is how to deal with the actuator failure uncertainties such as failure pattern,time and values.A complete parametrization covering all possible failures is used to solve this issue for adaptive parameter estimation.A simultaneous mapping from the estimated system/failure parameters to the controller parameters is employed to make the control system capable of ensuring the desired system performance under failures,which is verified by simulation results.
