In this paper, an adaptive iterative learningcontrol strategy is proposed for a class of nonlinear strict-feedback systems in the presence of arbitrary initial state error. the presented control algorithm utilizes an...
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ISBN:
(纸本)9781728159225
In this paper, an adaptive iterative learningcontrol strategy is proposed for a class of nonlinear strict-feedback systems in the presence of arbitrary initial state error. the presented control algorithm utilizes an expected error trajectory to resolve the initial condition problem. the controller is designed based on the backstepping technique, and the unknown constant parameters are estimated via differential-difference learning law. A typical series is introduced to solve the influence of external disturbance on tracking performance. theoretical analysis shows that all signals of the closed-loop system are bounded, and the system output perfectly follows the reference signal over the pre-specified interval. Finally, a simulation example is provided to demonstrate the effectiveness of the approach.
In this paper, an improved optimal sliding mode control strategy is proposed for multi-motor driving servo system. Some states of multi-motor drive system are not measurable and there exists unknown nonlinearity. To s...
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ISBN:
(纸本)9781728159225
In this paper, an improved optimal sliding mode control strategy is proposed for multi-motor driving servo system. Some states of multi-motor drive system are not measurable and there exists unknown nonlinearity. To solve this problem, the disturbance observer and extended state observer are both applied to estimate the unknown states and nonlinearity. Based on optimal controltheory, the optimal sliding surface is selected to guarantee the optimal dynamic performance of the sliding mode of the system. the effectiveness of designed control methods is illustrated by simulation results.
this paper mainly develops a robust adaptive tracking control scheme to counter effects caused by load fluctuation and external disturbances. An adaptive controller based on appropriate control strategy and adaptive l...
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ISBN:
(纸本)9781728159225
this paper mainly develops a robust adaptive tracking control scheme to counter effects caused by load fluctuation and external disturbances. An adaptive controller based on appropriate control strategy and adaptive law is presented based on Lyapunov stability theory. the output voltage asymptotic tracking of the buck converters is obtained even under the influence of load fluctuation and external disturbances. Simulation results also reveal the availability of the proposed adaptive control scheme.
Freshwater ecosystems are primarily impacted by climate, land use and land cover changes, and over-abstraction. Satellite Earth observation (SEO) data and technologies are key in environmental modelling and support de...
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In this work, the collaborative output tracking control of a class of nonlinear multi-agent systems is investigated under the framework of adaptive learningcontrol, where a state observer is utilized to estimate the ...
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ISBN:
(纸本)9781728159225
In this work, the collaborative output tracking control of a class of nonlinear multi-agent systems is investigated under the framework of adaptive learningcontrol, where a state observer is utilized to estimate the unmeasurable system states. By updating the individual input of each subsystem simultaneously based on the collaborative tracking error, the convergence of collaborative learning (co-learning) can be guaranteed. It is shown that with an appropriate unity partition on the derivative of desired output, the convergence of individual learning for each agent implies the convergence of co-learning. the rigorous convergence analysis of the co-learning is provided based on the composite energy function (CEF) methodology. In the end, an numerical example is illustrated to present the effectiveness of the proposed controller.
In this paper, an adaptive iterative learningcontrol (AILC) scheme based on high-order internal model (HOIM) is presented for a class of nonlinear continuous-time systems with unknown time-iteration- varying paramete...
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ISBN:
(纸本)9781728159225
In this paper, an adaptive iterative learningcontrol (AILC) scheme based on high-order internal model (HOIM) is presented for a class of nonlinear continuous-time systems with unknown time-iteration- varying parameter. the time-iteration-varying parameter is generated by a general iteration-dependent HOIM with iteration-varying order and coefficients. Compared withthe existing works based on iteration-invariant HOIM with fixed order and coefficients, our work significantly expands the application scope of HOIM-based ILC. Using the designed HOIM-based iterative learningcontroller, the learning convergence along the iteration axis is guaranteed through rigorous theoretical analysis under Lyapunov theory. Furthermore, the effectiveness of the proposed method is demonstrated according to the simulation results.
this paper proposes a finite-time adaptive tracking control scheme for permanent magnet synchronous motors (PMSM) with full state constraints. In order to deal with full state constraints, the nonlinear transformation...
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ISBN:
(纸本)9781728159225
this paper proposes a finite-time adaptive tracking control scheme for permanent magnet synchronous motors (PMSM) with full state constraints. In order to deal with full state constraints, the nonlinear transformation function is first introduced to transform the constraint problem into a non-constraint problem. then, we will provide a tracking differentiator that get the differentiation of the virtual control laws. At the same time, the neural networks (NN) are employed to approximate unknown nonlinearities. Finally, simulation results are given to validate the proposed control scheme.
Recent work has demonstrated the efficiency of deep reinforcement learning (DRL) in making optimization decisions in complex systems. Compared with other DRL algorithms, the proximal policy optimization (PPO) has high...
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ISBN:
(纸本)9781728159225
Recent work has demonstrated the efficiency of deep reinforcement learning (DRL) in making optimization decisions in complex systems. Compared with other DRL algorithms, the proximal policy optimization (PPO) has higher stability and lower complexity. the typical flexible flowshop scheduling problem (FFSP) with identical parallel machines is an NP-hard problem. this paper is the first case to utilize PPO to solve the problem with makespan minimization. the particular state, action and reward function are designed for the FFSP to follow the Markov property. the efficiency of PPO is evaluated on the wafer pickling instance and random instances with different scales. the results show that PPO can always provide satisfactory solutions within a reasonable computational time.
this paper developes iterative learningcontrol scheme and the stability conditions for multiple time-delays discrete system. By formulating the problem over repetitive process form using 2D theory, sufficient stabili...
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ISBN:
(纸本)9781728159225
this paper developes iterative learningcontrol scheme and the stability conditions for multiple time-delays discrete system. By formulating the problem over repetitive process form using 2D theory, sufficient stability conditions for multiple timedelays discrete system are developed along the trial, which guarantees the trial-to-trial error monotonic convergence. Moreover, the generalized Kalman-Yakubovich-Popov (KYP) lemma allows the iterative learningcontrol scheme to develope stability conditions with LMI constraints and analyze in the finite frequency domain. A numerical simulation for multiple time-delays discrete system is given to verify the proposed method.
this paper investigates the datadriven model free adaptive control (MFAC) problem for a class of non-affine nonlinear systems with stochastic fading channels. Firstly, the phenomenon of signal fading is regarded as a...
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ISBN:
(纸本)9781728159225
this paper investigates the datadriven model free adaptive control (MFAC) problem for a class of non-affine nonlinear systems with stochastic fading channels. Firstly, the phenomenon of signal fading is regarded as an independent stochastic process occurring at the output side, which has known mathematical expectations. Using an innovative linearization method, the considered non-affine system is converted into a linear model with a time-varying parameter called PPD and the MFAC controller is redesigned by utilizing the faded outputs. the stability of the system is analyzed rigorously and the influence of incomplete signal transmission on system convergence is explored. Finally, a numerical example shows the validity of the presented strategies.
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