基于企业整体模型的订单生产的车间运作过程研究
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摘要
本论文针对典型订单生产的具体特点和现有企业存在的MRP-Ⅱ和CAPP、PDM等系统各自独立,造成信息孤岛这一弊端,研究基于企业整体模型,以优化生产排产,减少库存在制品和半成品为目标的车间运作管理系统。讨论了系统所需解决的几个主要问题:订单管理,生产能力和能力需求计划,同步线形生产的能力需求计划的算法,提前期管理。由于车间计划是车间生产的关键环节,本文首先以优化车间计划制定为目标,研究了生产能力和能力需求计划,给出了相约同步线形生产的能力需求计划的算法。然后,按照面向过程并体现面向客户的思想,将车间的业务流程作了向前和向后拓展。通过业务流程重构,建立了以减少库存在制品和半成品为目标的车间运作模型,包括功能模型和信息流模型以及车间的CIMS结构。实现了工艺数据和产品数据对车间的导入。采用面向对象技术,建立了计划、质量、车间工艺,设备管理和调度类,并以产品信息为中介实现数据的集成。为了提高系统的处理事物的能力以及尽可能地避免数据冗余,数据库表作了关联性设计,并将产品属性的变化信息引进数据结构的设计中。在以上基础上,开发了带有自动和手动两种功能的原型系统。
To fit typical make-to-order enterprise and solve the problem that MRP-II, CAPP and PDM are separated to be lonely information island, this paper researches on workshop process information whose objective is to optimize production plan, to decrease work-in-process(WIP) inventors and half end-product, based on enterprise integrated model. The main problems are also discussed such as order arrangement, capacity, capacity requirement plan, dynamic capacity plan based on agreement synchronous linear produce and lead-time control. Since shop plan is the key of shop producing, with the goal to optimize producing workshop plan, the paper discusses the capacity and capacity requirement plan and provides an agreement synchronous linear production algorithm. After that, business process in jobshop is developed forward and backward according to the thought which faces to the course and the customer. Based on the business process reengineering, shop operation model is built with the goal to decrease WIP and half end-pro
    duct, including function model, information model and CIMS structure. Thus the data indraught from CAPP and PDM to job-shop is realized .Based on Object-Oriented technology, plan class, quality class, shop class, equipment class and dispatch class are built. Then data integration among classes is solved under product information as a medium among them. Finally, to decrease the redundance, the table of database is designed relatively and the field is designed with information of production attribute changed. Above all, a prototype system with two functions--automatic and manual, is developed.
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