A Multi-Agent-Based Agile Shop Floor Control System

The ability of an enterprise to deliver new products quickly and efficiently to market is often the chief determinant of competitive success. The shop floor control system must be an open dynamic system with the capability of adapting and accepting radical unpredictable changes in its structures and industrial practices. This paper presents a new architecture for an agile shop floor control system. The architecture is based on the methodology of multi-agent systems in distributed artificial intelligence (DAI). The multi-agent system has some common characteristics such as: distribution, autonomy, interaction, and openness, which are helpful for transferring traditional architecture to a distributed, cooperative architecture for a shop floor control system. A bidding method based on the required production cost and processing time is also proposed. Using a distributed object-oriented technique, a CORBA-based multi-agent framework for an agile shop floor control system is constructed to integrate all the activity of the shop floor into a distributed intelligent open environment. To implement the framework, a coordination model between agents and behavioural models of some representative agents are established.     

MODELING AND IMPLEMENTATION OF A DISTRIBUTED SHOP FLOOR MANAGEMENT AND CONTROL SYSTEM

Adopting distributed control architecture is the important development direction for shop floor management and control system, is also the requirement of making it agile, intelligent and concurrent. Some key problems in achieving distributed control architecture are researched. An activity model of shop floor is presented as the requirement definition of the prototype system. The multi-agent based software architecture is constructed. How the core part in shop floor management and control system, production plan and scheduling is achieved. The cooperation of different agents is illustrated. Finally, the implementation of the prototype system is narrated.     

分布式车间管理控制系统研究

制造执行系统（MAS）具有分布性,自主性,互操作性,开放性等特征,这些特征有助于将一个递阶式管理控制方式改造为并行智能方式,目前一些分布式对象计算中间软件也正不断走向商品化,因而采用MAS来改造CIMS环境下的车间管理控制系统能够使之具有快速动态重组生产过程的能力（这是敏捷性的关键）,提出了基于MAS的敏捷化车间管理控制系统的体系结构,并设计了用于任务分配的招标机制和Agent间协作机制,采用面向对象的方法对Agent的构造进行了讨论。     

Hybrid shop floor control system for Computer Integrated Manufacturing (CIM)

A shop floor can be considered as an important level to develop Computer Integrated Manufacturing system (CIMs). However, a shop floor is a dynamic environment where unexpected events continuously occur, and impose changes to the planned activities. To deal with this problem, a shop floor should adopt an appropriate control system that is responsible for the coordination and control of the manufacturing physical flow and information flow. In this paper, a hybrid control system is described with a shop floor activity methodology called Multi-Layered Task Initiation Diagram (MTD). The architecture of the control model contains three levels: i.e., the shop floor controller (SFC), the intelligent agent controller (IAC) and the equipment controller (EC). The methodology behind the development of the control system is an intelligent multi-agent paradigm that enables the shop floor control system to be an independent, an autonomous, and distributed system, and to achieve an adaptability to change of the manufacturing environment.     

适应性的递阶式车间层控制系统ALSYS

适应性的递阶式车间控制系统ALSYS具有相对控制层次的独立性、相对应用过程的独立性和相对于计算机的独立性,基本上能满足适应性的要求。本文论述了该系统新颖的体系结构和功能模型,并介绍了以上海交通大学生产系统与控制技术研究所的CIM示范系统实例所进行的系统开发和实现。     

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。     

面向状态的车间控制模型研究

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,针对数据加工车间设计了面向状态的控制模型并进行了应用研究。     

基于多代理技术的车间计划与调度研究

对分布式车间生产计划与调度过程进行了研究,并在基于多代理（multi-agent）的车间管理控制系统中实现。     

状态控制模型及其在数控加工车间中的应用

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,针对数控加工车间设计了面向状态的控制模型并进行了应用研究。     

基于LOGO技术的智能型混凝土搅拌主机控制器

本文阐述了混凝土搅拌主机的工作原理及其自动控制系统，提出了LOGO的编程技巧和解决实际生产问题的方法，尤其是对提高混凝土生产率，系统的故障诊断和生产过程的处理等方面做了切实可行的论述。     

APPLICATION OF IMPROVED PRODUCTION ACTIVITY CONTROL ARCHITECTURE FOR SHOP FLOOR INFORMATION SYSTEM IN DIGITAL MANUFACTURING

Shop floor control (SFC) is responsible for the coordination and control of the manufacturing physical and information flow within the shop floor in the manufacturing system. Weaknesses of the production activity control (PAC) architecture of the shop floor are addressed by the Maglica's new system architecture. This architecture gives rise to unlimited number of movers and producers thus evolving more complex but decentralized architecture. Beijing Institute of Technology - production activity control (BIT-PAC) architecture introduces an idea of sub-producers and sub-movers thus reducing the complexity of the architecture. All the equipments including sub-producers and sub-movers are considered to be passive in the proposed shop floor information system. The dissemination of information from sub-producers and sub-movers is done manually through a PC. Proposed BIT-PAC SFC architecture facilitates the information flow from shop floor to the other area of the organization. Effective use of internet information services (IIS) and SQL2000 is done along with the ASP.NET technology to implement the application logic. Applicability of the software based on BIT-PAC architecture is checked by running application software on a network PC that supports the dynamic flow of information from sub-producers and sub-movers to the other parts of the organization. Use of software is also shown at the end for BIT training workshop thus supporting the use of SFC architecture for similar kind of environments.     

A step towards real time [production monitoring and control system]

The Fraunhofer Institute for Information and Data Processing has developed a novel production monitoring and control system (PMC) for DaimlerChrysler Bremen for its C-type car which will begin production in 2007. Called the Provis.Agent, it is the first agent-based PMC system for distributed real-time production monitoring that allows integration with other shop floor related applications.     

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.     

An adaptive agile manufacturing control infrastructure based on TOPNs-CS modelling

In this paper, an infrastructure for adaptive production control in an agile manufacturing environment is proposed. With this infrastructure, Virtual Production Systems (VPSs), each of which takes care of the production of a specific customer ordered product, can be dynamically and flexibly constructed. This can be achieved logically by product workflow and physically by the resources in one or more manufacturing systems, e.g. job shops. To respond to changes and disturbances to a VPS, architecture for the adaptive controller of a VPS is designed based on adaptive control principles and Temporised Object-Oriented Petri Nets with Changeable Structure (OPNs-CS) modelling. A case study is used in this paper to illustrate how adaptive production control of VPS functions can be conducted to cope with changes and disturbances to the production system.     

CAC-CIMS生产线控制的研究和开发

成都飞机公司计算机集成制造系统(CAC CIMS)的生产线自动化控制系统由车间控制器、单元控制器(含制造工作站模块)和DNC接口(含设备)三层递阶结构组成.单元控制器与DNC接口构成柔性分布式数控(FDNC),它与车间控制器共同构成对制造过程的滚动控制.本文以CAC CIMS中车间控制器、单元控制器和DNC接口的研究和开发为背景,着重对生产线控制的递阶结构、系统功能和运行等进行论述.     

面向重组的车间控制器系统

本文以车间层计划调度功能为主线，分析了引入重组思想车间控制器计划调度功能的改进，以及相应控制结构的变化，并以此为基础开发了一个面向重组的车间控制器软件系统。     

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.     

自动铺布系统在现代服装业中的应用分析

分析了我国服装加工自动化存在问题最明显的环节,阐述了自动铺布系统在现代服装业生产中的重要性,介绍自动铺布系统的重要功能与作用,对比自动铺布机铺布与人工拉布之间的差异性,提倡全面使用自动铺布系统,以提高劳动生产率,使衣片更加具有精美性.     

TOC与MRPⅡ的混合系统

提出了新的市场环境下标准MRPⅡ的固有不足,简述了TOC理论及其计划与控制原理,提出了一种基于TOC理论和MRPⅡ的混合式计划系统,以改善MRPⅡ的实时特征,最大限度地压缩各阶级的提前期。论述了该混合系统中TOC思想与MRPⅡ系统的结合原则,简介了系统的组成与运作,描述了混合系统中DBR（鼓－缓冲区－绳）、作业排程、作业批量与提前期确定等几方面的运作原理和特征。