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Reliability and productivity of reconfigurable manufacturing systems.

机译:可重构制造系统的可靠性和生产率。

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摘要

Reconfigurable manufacturing systems can rapidly change machine and system configuration in response to market dynamics. However, given machine performance, differently configured systems result in different system performance. Systematic methodologies are required to predict the reliability of reconfigurable machines, and productivity of reconfigurable systems, including the impact of process parameter selection. The objective of this research is to develop general methodologies to analyze non-traditional system configurations for reliability and productivity, and gain insight into trends in their performance.; This research extends the understanding of configuration on system performance, both for machines and the full system. In reliability, a methodology is developed to determine machine reliability by using manufacturing process parameters and physics-of failure concepts. The parameters selected for a given machining process at a given speed influences the reliability of the machine and the system productivity. Physics-of-failure models connect process parameters to reliabilities, and the process plan connects those reliabilities to the system configuration. It is shown that the highest system productivity can occur at less than maximum production rate, and process plan aggressiveness determines the best configuration.; In productivity, Boolean algebra is applied to model arbitrary manufacturing system configurations and predict their productivity, but its use is limited due to high computational overhead. Combinatorial and Markov chain models are developed for the productivity of two classes of system configurations, parallel-serial and reserve capacity. The parallel-serial configuration class is serial lines set in parallel with and without crossover, and hybrid lines combining segments with both. Synergistic productivity improvements result from partial production states not in pure serial lines, and is dependent on machine availability. Adding parallel lines produces diminishing returns while reducing overall productivity variability. The reserve capacity configuration class is serial lines with standby machines that can perform any operation in the main production line should a machine fail. Standby machines add significantly to productivity, but again at a diminishing return. An optimal number of standby machines occur for a given main line length. Parallel-serial configurations derive higher productivity from each standby machine due to their bottleneck mitigation.
机译:可重新配置的制造系统可以根据市场动态快速更改机器和系统配置。但是,给定机器性能,配置不同的系统会导致不同的系统性能。需要系统的方法来预测可重构机器的可靠性和可重构系统的生产率,包括过程参数选择的影响。这项研究的目的是开发通用方法来分析非传统系统配置的可靠性和生产率,并深入了解其性能趋势。这项研究扩展了对机器和整个系统的系统性能配置的理解。在可靠性方面,开发了一种通过使用制造过程参数和故障物理原理来确定机器可靠性的方法。在给定速度下为给定加工过程选择的参数会影响机器的可靠性和系统的生产率。故障物理模型将过程参数连接到可靠性,而过程计划将那些可靠性连接到系统配置。结果表明,最高的系统生产率可能会低于最大生产率,并且流程计划的积极性决定了最佳配置。在生产率方面,布尔代数可用于对任意制造系统配置进行建模并预测其生产率,但由于计算量大,其使用受到限制。开发了组合链模型和马尔可夫链模型来提高两类系统配置(并行串行和备用容量)的生产率。并行-串行配置类是在交叉和不交叉的情况下并行设置的串行线,以及将段与这两者结合的混合线。协同生产效率的提高是由于部分生产状态(不是纯串行生产线)导致的,并且取决于机器的可用性。增加平行线会导致收益递减,同时降低总体生产率差异。备用容量配置类是带有备用机器的串行线,如果机器发生故障,备用机器可以在主生产线中执行任何操作。备用机器可显着提高生产率,但回报率却不断下降。对于给定的主线长度,备用机器的数量最佳。由于减少了瓶颈,因此并行-串行配置可从每台备用计算机获得更高的生产率。

著录项

  • 作者

    Freiheit, Theodor Ira.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Engineering Mechanical.; Engineering Industrial.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;一般工业技术;
  • 关键词

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