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Scheduling of generalized Cambridge rings.

机译：广义剑桥环的调度。

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摘要

A Generalized Cambridge Ring is a queueing system that can be used as an approximate model of some material handling systems used in modern factories. It consists of one or more vehicles that carry cargo from origins to destinations around a loop, with queues forming when cargo temporarily exceeds the capacity of the system. For some Generalized Cambridge Rings that satisfy the usual traffic conditions for stability, it is demonstrated that some nonidling scheduling polices are unstable. A good scheduling policy will increase the efficiency of these systems by reducing waiting times and by therefore also reducing work in process (WIP). Simple heuristic policies are developed which provide substantial improvements over the commonly used first-in-first-out (FIFO) policy. Variances are incorporated into previously developed fluid models that used only means to produce a more accurate partially discrete fluid mean-variance model, which is used to further reduce waiting times. Optimal policies are obtained for some simple special cases, and simulations are used to compare policies in more general cases. The methods developed may be applicable to other queueing systems.
机译：通用剑桥环网是一种排队系统，可以用作现代工厂中某些物料搬运系统的近似模型。它由一台或多辆车辆组成，它们将货物从始发地运送到环路周围，并在货物暂时超过系统容量时形成队列。对于满足一般交通条件以保持稳定的某些通用剑桥环，证明了某些非空闲调度策略是不稳定的。好的调度策略将通过减少等待时间并因此减少在制品（WIP）来提高这些系统的效率。开发了简单的启发式策略，该策略对常用的先进先出（FIFO）策略进行了重大改进。方差被合并到以前开发的流体模型中，该模型仅用于生成更准确的部分离散流体均方差模型，该模型用于进一步减少等待时间。针对一些简单的特殊情况获得了最佳策略，并使用模拟来比较更一般情况下的策略。开发的方法可能适用于其他排队系统。

著录项

  • 作者

    Bauer, Daniel Howard.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Industrial.;Operations Research.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 186 p.
  • 总页数 186
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:20

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