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A lean pull system design analysed by value stream mapping and multiple criteria decision-making method under demand uncertainty

机译：基于需求不确定性的价值流映射和多准则决策方法的精益牵引系统设计

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摘要

Lean philosophy is a systematic approach for identifying and eliminating waste through continuous improvement in pursuit of perfection, using a pull-control strategy derived from customers' requirements. However, not all lean implementations have produced such desired results because of not having a clear implementation procedure and execution guide. This article proposes a lean pull system implementation procedure based on combining a supermarket supply with two constant work-in-process (CONWIP) structures that can concurrently consider manufacturing system variability and demand uncertainty in multi-products, multi-stage processes to achieve lean pull system. The study uses a multiple criteria decision-making (MCDM) method, using a hybrid Taguchi technique for order preference by similarity to ideal solution (TOPSIS) method that takes customer demand uncertainty as a noise factor. This allowed identification of the most robust production control strategy to identify an optimal scenario from alternative designs. Value stream mapping (VSM) was applied to visualise what conditions would work when improvements are introduced. Finally, a real-world, thin film transistor-liquid crystal display (TFTLCD) manufacturing case-study under demand uncertainty is used to demonstrate and test findings. After comparing the current-state map and the future-state map of the case-study, the simulation results indicate that the average cycle time reduced from 15.4 days to 4.82 days without any loss of throughput.
机译：精益理念是一种系统的方法，它通过根据客户需求得出的拉动控制策略，通过追求完美的不断改进来识别和消除浪费。但是，由于没有清晰的实施过程和执行指南，并非所有精益实施都产生了这种预期的结果。本文提出了一种将超级市场供应与两个恒定的在制品（CONWIP）结构相结合的精益拉动系统实施程序，该结构可以同时考虑多产品，多阶段过程中制造系统的可变性和需求不确定性，以实现精益拉动系统。这项研究使用了多准则决策（MCDM）方法，使用混合Taguchi技术通过与理想解决方案（TOPSIS）方法相似的方法来优先选择订单，该方法以客户需求不确定性为噪声因素。这样就可以确定最可靠的生产控制策略，从而从替代设计中确定最佳方案。应用了价值流映射（VSM）来可视化在引入改进时将在哪些条件下工作。最后，在需求不确定性下的真实世界薄膜晶体管液晶显示器（TFTLCD）制造案例研究用于演示和测试发现。在比较了案例研究的当前状态图和未来状态图之后，模拟结果表明平均周期时间从15.4天减少到4.82天，而没有任何吞吐量损失。

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