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  • Long-term plant-level scheduling with uncertainty in the plywood industry [Elektronski vir]
    Ősz, Olivér ...
    Plywood is a widely used wood-based product. Among others, plywood is used for buildings, furniture, or sports. Plywood is typically made in production plants, where the incoming material is ... processed through several transformation stages to satisfy the needs of the customer. Therefore, the production process is a complex procedure. Furthermore, production scheduling is a difficult and time-consuming task, as multiple orders, different machines, and production lines have to be taken into consideration simultaneously. Scheduling of production systems has been widely studied in the literature but production scheduling in the plywood industry has received little attention. The scheduling problem of a plywood plant has been formulated through careful analysis of the selected problems in order to specify their hard and soft constraints and define their objective functions. In the case of long-term production planning, external aspects should also be taken into consideration. Unforeseen events, e.g., material shortage, changes in demands, disrupted processes, and quality issues can render the production plan infeasible. In such a case, the functionality of the system should be restored quickly, with minimal additional expenses and impact as possible. Recently, material resource availability disruptions have become a frequent issue due to epidemiological and geopolitical events affecting global supply chains. In previous work, the authors formulated Mixed-Integer Linear Programming models to minimize the cost caused by such supply disruptions in a plywood production facility. The results showed limited applicability for planning with long time horizons. Thus, the application of heuristic approaches is preferable. This study presents a Genetic Algorithm-based scheduling procedure for the plywood production process. The aim of the proposed approach is to minimize penalties for order cancellations and deadline modifications. The operator of the facility may change the timing of each production step and swap the deadlines of orders from the same client to achieve this goal. The presented approach has been tested on numerous generated examples based on real-life industrial data from a Central European mill.
    Source: 10th Hardwood conference proceedings [Elektronski vir] : 12-14 October 2022, Sopron (Str. 263-270)
    Type of material - conference contribution
    Publish date - 2022
    Language - english
    COBISS.SI-ID - 127645955

    Link(s):

    http://www.hardwood.uni-sopron.hu/wp-content/uploads/2022/10/Hardwood2022_Proceedings.pdf

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