A modified MRP for a production system with the coexistence of MRP and kanbans
针对工厂中MRP与看板系统共存的情况，提出一种改进的MRP方法处理看板管理零件，并通过仿真比较三种方法，给出两种有效的批量规则。
Abstract This paper deals with MRP treatments of the coexistence of MRP and kanban systems. In practical applications, MRP and kanban can both exist in a factory. When a production system contains parts managed by an MRP system and parts managed by a kanban system, MRP needs to have a special way of dealing with those parts managed by the kanban system in order to provide accurate gross demand data for the MRP system. A modified MRP for treating parts ordered through kanbans with the coexistence of MRP and kanbans is proposed. Along with two other existing methods (one by Karmarkar and another by a major tractor company), three methods are compared in a GPSS simulation study. Empirical results regarding inventory and shortages from the simulation study showed that both the proposed modified MRP and Karmarkar's methods of dealing with parts ordered by kanbans performed quite well. This research study suggests two effective lot‐sizing rules to be used in MRP part explosion for kanban‐controlled stages of a production system in which some stages are controlled by kanbans and other stages by MRP releases. The simulation study established empirical evidence for the effectiveness of these two lot sizing rules.