基于负荷控制原理的DBR改进机制

A Corrected Drum-Buffer-Rope Control Mechanism Based on Workload Control

DBR是约束理论应用于企业生产计划与控制的具体工具,广泛应用于具有明显主工艺流向和瓶颈特征的GFS生产系统。负荷控制被认为是应对MTO背景下GJS生产系统的一种有效生产计划与控制解决方案。通过集成负荷控制的订单投放控制原理和方法,本文提出了一种DBR改进机制C-DBR。利用Simio仿真软件建模,系统比较了DBR与C-DBR机制在不同紧急订单比例、机器故障间隔时间与保护产能水平等参数影响之下的系统绩效。结果显示,C-DBR机制更适合动态环境下GFS系统的生产控制,结合车间瓶颈缓冲的动态控制能够明显改善车间在制品数量、车间通过时间与系统通过时间等绩效指标。

Drum-Buffer-Rope is a specific production application of Theory of Constraints,which is widely used in the GFS production system with obvious main process flow direction and bottlenecks characteristics.Workload Control is considered to be an effective production planning and control solution for GJS production system in the context of Make-To-Order.A Corrected- Drum-Buffer-Rope mechanism is presented in this paper by integrating the principle and method of WLC.The system performance of DBR and C-DBR under different emergency order ratios,machine failure intervals and protection capacity levels is systemati- caUy compared by using Simio ■software.The results show that C-DBR mechanism is more suitable for the production control of GFS system in dynamic environment,and the dynamic control method combined with bottleneck buffer can significantly improve the performance of WIP,shop floor throughput time and gross throughput time.