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Integral reinforcement learning-based guaranteed cost control for unknown nonlinear systems subject to input constraints and uncertainties

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  • Liang, Yuling
  • Zhang, Huaguang
  • Zhang, Juan
  • Luo, Yanhong

Abstract

This paper investigates guaranteed cost control (GCC) problem for nonlinear systems subject to input constraints and disturbances by utilizing the reinforcement-learning (RL) algorithm. Firstly, by establishing a modified Hamilton–Jacobi–Bellman (HJI) equation, which is difficult to be solved, a model-based policy iteration (PI) GCC algorithm is designed for input-constrained nonlinear systems with disturbances. Moreover, without requiring any knowledge of system dynamics, by designing an auxiliary system with a control law and an auxiliary disturbance policy, an online model-free GCC approach is developed by utilizing integral reinforcement learning (IRL) algorithm. To implement the proposed control algorithm, the actor and disturbance NNs are constructed to approximate the optimal control input and worst-case disturbance policy, while the critic NN is utilized to approximate optimal value function. Further, a synchronization weight update law is developed to minimize the NN approximation residual errors. The asymptotic stability of controlled systems is analyzed by applying the Lyapunov’s method. Finally, the effectiveness and feasibility of the proposed control method are verified by two nonlinear simulation examples.

Suggested Citation

  • Liang, Yuling & Zhang, Huaguang & Zhang, Juan & Luo, Yanhong, 2021. "Integral reinforcement learning-based guaranteed cost control for unknown nonlinear systems subject to input constraints and uncertainties," Applied Mathematics and Computation, Elsevier, vol. 408(C).
  • Handle: RePEc:eee:apmaco:v:408:y:2021:i:c:s0096300321004252
    DOI: 10.1016/j.amc.2021.126336
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    References listed on IDEAS

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    1. Wang, Xia & Shen, Mingwang & Xiao, Yanni & Rong, Libin, 2019. "Optimal control and cost-effectiveness analysis of a Zika virus infection model with comprehensive interventions," Applied Mathematics and Computation, Elsevier, vol. 359(C), pages 165-185.
    2. Weihai Zhang & Guiling Li, 2014. "Discrete-Time Indefinite Stochastic Linear Quadratic Optimal Control with Second Moment Constraints," Mathematical Problems in Engineering, Hindawi, vol. 2014, pages 1-9, May.
    3. Alt, Walter & Schneider, Christopher & Seydenschwanz, Martin, 2016. "Regularization and implicit Euler discretization of linear-quadratic optimal control problems with bang-bang solutions," Applied Mathematics and Computation, Elsevier, vol. 287, pages 104-124.
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    Cited by:

    1. Wang, Yun & Fang, Tian & Kong, Qingkai & Li, Feng, 2024. "Zero-sum game-based optimal control for discrete-time Markov jump systems: A parallel off-policy Q-learning method," Applied Mathematics and Computation, Elsevier, vol. 467(C).

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