Stigmergic cooperation mechanism for shop floor control system

Inspired by the collective behaviour of ant colonies, a stigmergic cooperation mechanism for shop floor control is proposed. In stigmergic shop floor control systems, one piece agent takes charges of one work piece and chooses a manufacturing resource for it in the light of pheromones stored in information environment. Piece agents also update these pheromones to guide subsequent agents routing. Experiments confirm that a stigmergic cooperation mechanism has an excellent scheduling performance in a static environment, good suitability for the stochastic machining-time problem and good adaptability to shop floor changes.     

模具车间作业控制系统设计

车间作业控制是制造企业MRPⅡ／ERP系统的一个重要组成部分,是MRPⅡ／ERP计划的具体实施环节。以模具生产为例,阐述了一种车间作业控制系统的功能结构和设计方法。     

Fundamental technology for RFID-based supervisory control of shop floor production system

To improve the leanness of shop floor production system, supervisory control of its production process should be accurate enough so that the state of every product can be tracked in time and its operation can be scheduled correctly. For this purpose, radio frequency identification (RFID) technology can be used to acquire accurate production data. This paper reports our research on the fundamental technology for RFID-based supervisory control of shop floor production system, in which production state data are acquired by RFID tags and readers, data communication is realized by programmable logic controller and industrial field bus technology, production process control is implemented by the host computer and material handling devices, and the supervisory control software is developed based on multithread technology. The details of these fundamental technologies have not been reported in existing literatures. A prototype of RFID-based supervisory control system is developed for an experimental manufacturing cell, and some experiments were done to verify the feasibility of these technologies.     

CIM strategies and the shop coordination system

This paper discusses how a CIM strategy can, and should, be developed and how the shop coordination system can be a key component in achieving that strategy. The discussion on CIM centers on the need for the business strategy to drive the manufacturing strategy and the manufacturing strategy to drive the CIM strategy. The discussion on the shop coordination system details how this system may be specified and designed to be a cornerstone of the CIM strategy and how this system can achieve specific goals of the business strategy. The shop coordination system is defined in relation to the CIM strategy.     

计算机集成制造——21世纪中国制造业核心竞争力的助动器

随着全球经济一体化的到来,人们应当改变对企业竞争力的认识.今天的企业核心竞争力不仅要包括企业的市场反应速度,还应该包括企业集成运营它所拥有的资源的能力.企业要集成运营的三大资源是技术、组织和人员.对企业以上的两种能力进行了讨论,用数学方式推导并解释了企业的核心竞争力.计算机集成制造因为全面地推动企业的市场反应速度和资源集成能力的发展,因而推动了企业竞争力的全面提高.     

Flexible control [shop floor control]

Adaptability in shop floor control is vital as production processes constantly change and improve. The author outlines the requirements for modelling manufacturing systems using an object-event-action methodology     

虚拟车间异地制造资源集成方法

集成异地制造资源是虚拟车间的基本要求,需要解决资源模型标准化、克服硬软件平台异构性和制造资源评价与选择三个方面的问题。建立了用于一个制造执行系统的制造资源数据模型,采用了CORBA技术解决异地、异种数据库读写问题,应用了模糊层次分析方法进行制造资源评价与选择。     

基于MES的生产车间管理信息系统

针对制造企业在实施生产管理信息化过程中存在的问题,提出以制造执行系统(MES)为核心的三层结构———企业资源计划(ERP) /制造执行系统(MES) /过程控制系统(PCS)的生产管理信息化的实施方案,用于解决生产与计划相互脱节的难题,实现了车间的现场调度、生产过程控制、在线质量控制,以及对生产过程中“非常规信息”的控制与管理,加强了制造计划的可执行性。     

供应链环境下车间订单计划与执行的集成系统

在阐述支持车间订单计划和执行的信息系统的基础上,提出实现车间订单计划和执行的集成系统架构,以在实现车间订单管理的同时优化对供应链的管理,提高供应链的敏捷性.     

面向状态的车间控制策略研究

当前的生产计划和控制系统较好地解决了企业中期的物料需求计划与能力需求计划问题,而车间以下层次的生产作业计划与控制是其薄弱环节。这里通过对现代车间生产活动控制的功能、目标和现代车间制造系统基本特征的考察、分析,揭示了现代车间控制的根本矛盾,提出了面向状态的车间控制策略和方法并进行了应用研究。     

Integrated information modelling for CIM

The development of strategic plans for the stepwise introduction of computer integrated manufacturing requires models and modelling techniques to describe the business processes, functions and the required data and their relation to the desired system components. Several modelling methods have been analyzed. The fundamental deficiency is the missing integration between the process and the data models from the enterprise viewpoint. The paper shows the key issues of an object-oriented (OO) modelling method which can be used for CIM-planning as well as for the integration of CIM-standards, e.g. STEP, which are currently under development in European and international commities. The main OO-features like encapsulation, inheritance and the class concept were used to describe enterprise object-classes and the process which change the instances of these classes. The feature-structure of the object classes and the aggregation to complete models were shown.     

车间调度系统的3层体系结构

提出了车间调度系统的3层体系结构。首先介绍了体系结构中各层的功能，详细讨论了体系结构中调度模型组件、调度算法组件和调度引擎的接口设计，最后分析了体系结构中各组件的工作原理。     

Tracking lean (automated shop floor data-capture technologies for lean automotive manufacturing)

We investigate how automated shop floor data-capture technologies enable lean automotive manufacturing. The concept of lean automotive manufacturing involves identifying the production factors leading to success in the global automobile manufacturing industry. Data capture is any kind of information-gathering needed to manage the value-production process while the goal of automation is to narrow the margin for error as much as possible. The rationale for instituting a data-capture system is it reduces the cost of acquiring and moving information around. Auto data-collection (AIDC) technologies eliminate the labour-intensive and costly paper pushing that typically permeates shop floor processes, which enables companies to reduce costs. In this paper, we discuss the advantages gained by automotive companies such as Volvo Truck Company and Honda supplier Listowel from data-capture systems.     

Multi-agent-based fuzzy scheduling for shop floor

This paper deals with a multi-agent architecture of agile manufacturing system and a hybrid strategy for shop floor scheduling. Firstly, it proposes a distributed multi-agent-based manufacturing structure, which has characteristics of self-determination and distribution grounded on multi-agent as well as control and harmony grounded on hierarchical structure or dynamic logical unit. Then, based on the fuzzy theory and method, it studies a hybrid shop floor scheduling strategy that combines fuzzy programming with fuzzy contract net protocol. The hybrid strategy has both virtues of precision of static programming and flexibility of contract net protocol.     

现代车间的控制系统

机械加工车间是机械制造业最底层的基础单元。加工车间的先进性体现了制造技术的先进性。当前，工业化国家正大力推进制造业信息化，悉心研究“e制造”技术。现代机械加工车间应该是制造技术(MT)和信息技术(IT)的结合点，它以数控机床为基本装备，组成不同的生产线，适应车间的高效生产。而数控系统又是数控机床的核心，因此．数控系统的先进性就直接影响了车间的先进性。那么，现代加工车间的CNC控制系统应该具有什么特点呢?     

Performance Management of Communication Networks for Computer Integrated Manufacturing

This paper focuses on a method to maintain an acceptable level of performance of the communication networks serving advanced manufacturing systems. This method is a part of performance management and aims to improve the network performance of handling various types of message such as e-mails, file transfers, control signals, and so on. In order to achieve the goal, the performance management adjusts protocol parameters such as timers and queue capacities, on line. The principles of fuzzy logic, genetic algorithms, and neural networks have been combined in formulating the performance management rules and for finetuning the manager. In orderto demonstrate the efficacy of this approach, a performance management procedure developed for the IEEE 802.4 protocol standard has been evaluated via discrete event simulation.     

动态车间环境下的调度控制器设计

为了对车间制造系统实施有效动态调度,提出了一个动态调度控制器的设计框架,并详细阐述了它的功能模块和工作流程.控制器采用基于过程规范语言本体论的工艺规划信息表示和多步骤适应调度策略,并从知识库中获取规则,使用在线仿真的方式对其进行评价.这些技术的应用保证了控制器与车间内部其他异构信息系统间有效地传递工艺规划信息,并具有很好的调优能力.最后,给出了一个制造企业的应用实例,验证了该设计框架的可行性和有效性.     

液压技术在数控机床及加工中心上的应用

通过详细分析液压技术在数控机床和加工中心上的应用情况可见,液压技术在数控机床及加工中心上发挥着重要的作用.而液压技术必须通过自身的不断发展,才能满足日益发展的加工设备的要求.