Research Initiation: Two-Level Performance Analysis of Cellular Manufacturing Systems

该项目的目标是开发一种用于单元制造系统的两级性能模型，其中单元通过材料处理系统(MHS)连接，原材料和未完成的部件存储在自动存储/检索系统(AS/RS)中。每个单元本身是共享公共有限存储空间和加载/卸载站的工作站网络。这些工作站通过材料处理单元连接。该模型是这样的：在一个级别中，单独的小区、MHS和AS/RS分别被分析。(这些组件之间的相互依存关系反映在分析中。)然后，在第二级别中使用来自该级别的结果，以便定义每个代表小区、MHS或AS/RS的站的聚合网络。然后，根据首席调查员最初引入的概念将该网络分解为多个子网络。这两个水平之间的相互关系需要迭代的数值技术来计算不同的绩效衡量标准。从建模的角度来看，该模型有两个显著的贡献：(1)它明确地考虑了MHS和AS/RS；(2)它考虑了不同的调度策略，从而在一定程度上反映了系统的动态性质。从应用的角度来看，该模型可以用于不同的情况，从单个单元的分析到大规模网络型制造系统的分析。

The objective of this project is to develop a two-level performance model for cellular manufacturing systems where the cells are connected via a material handling system (MHS) and raw material and unfinished parts are stored in an Automatic Storage/Retrieval System (AS/RS). Each cell by itself is a network of workstations sharing a common finite storage space and a load/unload station. These workstations are connected via a material handling unit. The model is such that in one level the individual cells, the MHS and the AS/RS are each analyzed separately. (The interdependency among these components is reflected in the analysis.) The results from this level are then utilized in a second level in order to define an aggregated network of stations each representing a cell, the MHS, or the AS/RS. This network is then decomposed into subnetworks based on a concept originally introduced by the Principal Investigator. The interrelationship between the two levels requires an iterative numerical technique in order to compute different performance measures. From a modeling perspective, the model makes two significant contributions: (1) it explicitly considers the MHS and the AS/RS, (2) it accounts for different scheduling policies and, therefore, reflects the dynamic nature of the system to some degree. From an application perspective, the model may be used in different circumstances, ranging from the analysis of an individual cell to the analysis of a large scale network type manufacturing system.