关键词: 生产计划, 预防性维护, 非固定提前期, 联合优化

Abstract: In serial manufacturing systems with re-entrant flows such as semiconductor wafer manufacturing system,there is a strong non-linear dependency between lead times and workload.Also,maintenance activities have a great interruption in the execution of production plans.Therefore,the preventive maintenance was introduced into the non-fixed lead time function to reflect the interaction between production planning and preventive maintenance.The function was proposed to describe the relationship between the workload and preventive maintenance on the lead time in production planning.Based on the non-fixed lead time function,a joint optimization model of the production planning and preventive maintenance was established.This model's object was to minimize the total production and maintenance cost of the system.Impact of maintenance on the execution of the production planning was considered by comparing with existing production planning models.Numerical tests under production lines with different complexity and degradation levels verified that the joint optimization model had lower total cost.

Key words: production planning, preventive maintenance, non-fixed lead time, joint optimization