多阶段CONWIP 系统流通卡分布的确定方法

在ＣＯＮＷＩＰ系统中,流通卡分布是系统有效运行的关键因素。针对多阶段ＣＯＮＷＩＰ系统,提出了基于遗传算法和仿真的流通卡分布的确定方法。研究实例表明,基于遗传算法获得的结果是合理的,并且节约了计算时间。     

CONWIP生产控制方法

介绍ＣＯＮＷＩＰ生产控制方法的产生,工作原理,优点,研究现状及未来的研究方向。有效的生产控制系统是指在正确的时间,以有竞争的价格生产出正确的产品,继ＭＲＰ－Ⅱ和Ｋａｎｂａｎ之后,ＣＯＮＷＩＰ生产控制方法引起人们的广泛重视,成为生产控制方法研究的热点。     

FMS中动画仿真系统的设计与实现

ＦＭＳ动画仿真系统是通用单元控制器中的一个主要子系统，本文介绍了该系统的两个主要组成；     

FMS物流系统的调度与控制

本文针对FMS物流系统，提出了一种基于任务分类的逐层细化调度与控制策略。并在上海第四机床厂箱体零件柔性制造系统（SJ－FMS）中加以具体应用和软件实现。结果表明，这种调度与控制策略能够有机地将调度的计划性和随意性相结合，保证控制的实时性，具有实用价值。     

基于面向对象着色Petri网的FMS仿真研究

1引言 柔性制造系统(F Ms)的控制问题是当今Petri网应用研究的热点,也是难点~[1].研的主要困难在于Petri网的复杂性随着系统规模的增加呈指数倍地增长.在当前激烈的市场竞争环下,人们在这方     

FMS实时在线调度的仿真建模

为提供进行ＦＭＳ系统在线及离线分析所需的各种信息，本文给出了“最小状态信息”集合的定义。在此基础上，采用面 向对象的设计方法和Ｃ＋＋语言研制开发了具有实时在线仿真能力的ＦＭＳ仿真语言ＳＬＦＭＳ，为在线开展ＦＭＳ调度优化问题的研究提供了良好的仿真支持环境。最后，本文提出并建立了ＦＭＳ实时在线调度优化系统，为解决ＦＭＳ的实时在线调度优化问题提供了一条有效途径。     

面向对象方法在FMS仿真系统中的应用

该文主要以面向对象的程序设计方法为研究工具，描述了ＦＭＳ仿真系统中的基本活动和程序设计方法。     

A CONWIP model for FMS control

Production inventory control is one of the most important aspects of a flexible manufacturing system (FMS) design. CONstant Work In Process (CONWIP), which is a hybrid of push-and-pull type systems, offers an alternative to effective utilization of the expensive FMS equipment while still meeting customer requirements. In the selection of an FMS control method, material handling often becomes one of the capacity constraints which forms the basis of various research interests. In this paper, a structure-based model for a CONWIP-controlled FMS is proposed, and within it, the node type characteristics concept is used to describe the constraints in FMS. Furthermore, simulation is used to determine the card number based on the structure-based model. The simulation results demonstrate that the model is suitable for the design and operation of FMS. The model can be used as a manufacturing execution system of enterprise resources planning. An architecture for this integrated design based on Internet/Intranet systems is also proposed.     

一种库存控制策略

运用动态规划的思想,提出了一种柔性制造系统库存的优化控制策略.其最优性根据庞德里亚金最小值原理导出.这种优化该策略具有解析形式,并具有计算复杂度低和状态反馈的优点,可用于生产的实时调度.     

生产存储控制策略的仿真研究

为了验证Push/Pull混合控制策略的最优性,开发了一个生产存储控制策略仿真的软件包,软件包用结构模型描述任意生产线中的加工与装配工序间的结构关系,用不同的仿真方程描述不同策略控制下的不同工序的不同的物流过程．仿真结果证明,对于一般批量生产系统Push/Pull混合控制策略是最好的策略．     

CONWIP based control of a lamp assembly production line

Efficient and effective production control systems are very important for manufacturing plants. CONWIP, one of these production control systems, has a high potential of becoming the best one available because it suits a variety of production environments and is easy to implement. In the following paper, we compare the single-loop and multi-loop CONWIP production control systems for an actual lamp assembly production line producing different kinds of products with discrete distribution processing time and demand. A model is formulated with respect to total cost and service level. A novel rule-based genetic algorithm (GA) approach is proposed for the multi-loop CONWIP system to find the optimum parameter setting. The results have shown that the single-loop CONWIP production control system is more efficient than the multi-loop system. It can greatly decrease the total cost and the WIP (Work-In-Process) with zero shortage probability.     

Solution of scheduling problems of job-shop type FMS with alternative machine tools

FMS is now expected as one of the measures to cope with the recent requirements for the production. To elevate the performance of the FMS, it is necessary to establish its design methodology by which the flexibility and compatibility of the system functions can be determined. In this regard, one of the most important technical subjects is how to solve problems arising from machine breakdown to ensure optimum use of the system performance.

This paper deals with a scheduling problem of a job-shop type FMS with machine breakdown, taking into account alternative machine tools for each machining process of parts. The problem is solved by a discrete event simulation using SLAM II simulation language. Performance of the system is measured in terms of the machine utilization, mean flow time, total production, number of workpieces in-progress, and makespan.     

多重入生产线的CONWIP投放方法研究

CONWIP（Constant Work in Process）是一种基于拉式（pull）控制物料投放的方法。最初应用于Flow Shop式生产系统,通过限制半成品数量以控制生产线运作提供可靠的制造周期。然而,原始的CONWIP方法不能适应半导体这类同一加工站多重人的生产系统。该文根据半导体生产线多重人的特性,提出与多重人瓶颈相结合的CONWIP投放方法,不仅控制生产线中的半成品数量,并且结合了TOC（Theory of Constraints）思想,从而提高生产线的性能。最后,通过一些仿真证明了方法的有效性。     

变质品生产、库存控制与预防维修联合建模与优化

针对产品变质带来库存损耗的问题,在经济生产批量模型的基础上加入零库存时间,提出新的库存控制策略.该策略以预防维修周期和零库存时间为联合决策变量,利用更新定理建立了单位时间内总成本的期望模型.为了提高对此期望的计算速度,设计基于矩阵运算的蒙特卡罗仿真算法,并与遗传算法结合,大大提高了模型的优化速度.通过比较研究,验证了仿真算法的显著优势,并通过敏感性分析明确了相关参数的变化对最优策略的影响.