Simulation-based Real-time Production Control with Different Classes of Residence Time Constraints
Simulation-based Real-time Production Control with Different Classes of Residence Time Constraints
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DOI：
10.1109/case49997.2022.9926676
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
Feifan Wang;Feng Ju
中科院分区：
文献类型：
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作者：
Feifan Wang;Feng Ju
停留时间约束在生产系统中被广泛观察到，例如半导体制造、食品工业和电池生产，其中部件在一个或多个连续缓冲器中花费的时间受到限制。当零件的停留时间超过一定水平时，零件可能会出现质量问题，需要立即进行进一步处理或报废。为了优化生产率和报废率等生产性能，需要根据实时系统状态适当管理所有机器的行为，以防止生产过多的中间件，从而避免报废风险。为了解决这个问题，提出了一种基于仿真的实时控制方法来进行生产控制，在面对四个基本类的停留时间的约束，广泛地看到在半导体制造。首先建立了马尔可夫决策过程（MDP）模型，并提出了一种特征提取方法和基于特征的近似结构来处理维数灾难。在训练过程中，通过仿真来估计基于特征的近似结构的参数，从而近似地得到MDP模型中的前瞻函数。仿真实验表明，这种方法导致显着的系统性能改善与低的计算开销，这使得实时生产控制可行的较长的串行线与不同类别的停留时间的限制。
Residence time constraints are widely observed in production systems, such as semiconductor manufacturing, food industry and battery production, where the time that a part spends in one or several consecutive buffers is restricted. When the residence time of a part is beyond a certain level, the part might face quality problems and need to be further treated or scrapped immediately. To optimize the production performance such as production rate and scrap rate, one needs to properly manage all machines’ behavior according to real-time system states to prevent from producing too many inter-mediate parts with high risk of scrap. To solve this problem, a simulation-based real-time control method is proposed to perform production control in face of four basic classes of residence time constraints that are widely seen in semiconductor manufacturing. A Markov Decision Process (MDP) model is first built, and a feature extraction method and a feature-based approximate architecture are proposed to deal with the curse of dimensionality. Simulation is applied in the training to estimate parameters of the feature-based approximate architecture, so the lookahead function in the MDP model can be approximately obtained. Simulation experiments suggest that such a method leads to significant system performance improvement with low computation overhead, which makes real-time production control feasible for longer serial lines with different classes of residence time constraints.