• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2023, Vol. 59 ›› Issue (13): 246-259.doi: 10.3901/JME.2023.13.246

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An Improved Q Learning Algorithm to Optimize Green Dynamic Scheduling Problem in a Reentrant Hybrid Flow Shop

WU Xiuli, YAN Xiaoyan   

  1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083
  • Received:2022-07-09 Revised:2022-12-19 Online:2023-07-05 Published:2023-08-15

Abstract: Energy conservation and emission reduction are of great significance to achieve sustainable development. This study considers the influence of dynamic disturbance events on production and studies the reentrant hybrid flow shop green dynamic scheduling problem (RHFS-GD). An improved Q learning algorithm (IQL) is proposed to solve the RHFS-GD problem. In a reentrant hybrid flow shop, each stage is abstracted as an agent, and a multi-agent reinforcement learning model is established. The mean shift algorithm is used to cluster the historical states. To achieve global optimization, an experience sharing strategy is designed to realize the experience interaction among agents, and an adaptive greedy strategy is proposed to select actions. Finally, numerical experiments are carried out, and the experimental results show that the IQL algorithm is superior to single scheduling rules, which can improve production efficiency while ensuring low energy consumption, can quickly respond to dynamic disturbance events in the actual production, and can effectively solve practical problems.

Key words: energy conservation and emission reduction, reentrant hybrid flow shop, green dynamic scheduling, improved Q learning algorithm

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