In this paper, a data-based fault tolerant control(FTC) scheme is investigated for unknown continuous-time(CT)affine nonlinear systems with actuator faults. First, a neural network(NN) identifier based on particle swa...In this paper, a data-based fault tolerant control(FTC) scheme is investigated for unknown continuous-time(CT)affine nonlinear systems with actuator faults. First, a neural network(NN) identifier based on particle swarm optimization(PSO) is constructed to model the unknown system dynamics. By utilizing the estimated system states, the particle swarm optimized critic neural network(PSOCNN) is employed to solve the Hamilton-Jacobi-Bellman equation(HJBE) more efficiently.Then, a data-based FTC scheme, which consists of the NN identifier and the fault compensator, is proposed to achieve actuator fault tolerance. The stability of the closed-loop system under actuator faults is guaranteed by the Lyapunov stability theorem. Finally, simulations are provided to demonstrate the effectiveness of the developed method.展开更多
We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit differen...We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit different shapes by rotating the fast axis of the fiber optical pigtail of a dispersive dielectric mirror.The oscillator provides a series of laser performance,such as a threshold pump power for continuous wave laser oscillation of 3.1 mW,an optical-to-optical efficiency for modelocking of 29%,and an integrated relative intensity noise of 0.08%.To the best of our knowledge,this is the first report of>1 GHz ultrafast all-fiber YDFL with PM architecture.展开更多
基金supported in part by the National Natural ScienceFoundation of China(61533017,61973330,61773075,61603387)the Early Career Development Award of SKLMCCS(20180201)the State Key Laboratory of Synthetical Automation for Process Industries(2019-KF-23-03)。
文摘In this paper, a data-based fault tolerant control(FTC) scheme is investigated for unknown continuous-time(CT)affine nonlinear systems with actuator faults. First, a neural network(NN) identifier based on particle swarm optimization(PSO) is constructed to model the unknown system dynamics. By utilizing the estimated system states, the particle swarm optimized critic neural network(PSOCNN) is employed to solve the Hamilton-Jacobi-Bellman equation(HJBE) more efficiently.Then, a data-based FTC scheme, which consists of the NN identifier and the fault compensator, is proposed to achieve actuator fault tolerance. The stability of the closed-loop system under actuator faults is guaranteed by the Lyapunov stability theorem. Finally, simulations are provided to demonstrate the effectiveness of the developed method.
基金supported by the National Natural Science Foundation of China(No.61905205)。
文摘We demonstrate an all-polarization-maintaining[PM]passively mode-locked Yb^(3+)-doped fiber laser[YDFL]with a fundamental repetition rate of 1.3 GHz.The optical spectra of a linearly polarized soliton exhibit different shapes by rotating the fast axis of the fiber optical pigtail of a dispersive dielectric mirror.The oscillator provides a series of laser performance,such as a threshold pump power for continuous wave laser oscillation of 3.1 mW,an optical-to-optical efficiency for modelocking of 29%,and an integrated relative intensity noise of 0.08%.To the best of our knowledge,this is the first report of>1 GHz ultrafast all-fiber YDFL with PM architecture.
