Abstract

A shipyard’s production plan has a hierarchical structure comprising a long-term plan and a mid-term or short-term plan. The mid-term schedule is established based on the major schedules of the long-term plan. However, in the long-term planning stage, the mid-term schedule is not considered owing to timing discrepancies and the lack of data. Therefore, even if a major schedule is changed to achieve production goals – such as workload balancing in the mid-term scheduling process – this is not reflected in the long-term plan. To solve these discrepancy challenges in conventional production planning, the problems of an existing shipbuilding production planning process were derived, and an algorithm to optimize the berth schedule by reflecting the mid-term schedule when establishing a long-term plan was developed. The developed methodology and algorithm were installed in an existing planning system and applied to an actual shipyard production planning process. Results showed improvements in long-term and mid-term scheduling.

摘要

造船厂的生产计划具有层次结构，包括长期计划和中期或短期计划。中期计划是在长期计划的主要计划的基础上制定的。但在长期规划阶段，由于时间上的差异和数据的缺乏，并未考虑中期时间表。因此，即使更改主要计划以实现生产目标（例如中期计划过程中的工作负载平衡），也不会反映在长期计划中。为了解决常规生产计划中的这些差异挑战，导出了现有造船生产计划过程中的问题，并开发了一种通过在建立长期计划时反映中期计划来优化泊位计划的算法。开发的方法和算法安装在现有的规划系统中，并应用于实际的造船厂生产规划流程。结果显示长期和中期调度有所改进。