气瓶焊接设备的虚拟改装设计

 基于虚拟制造(VM)技术讨论了设备虚拟改装的原理和特点，提出虚拟改装系统的实现方法和运行模式，讨论了老旧机床本体及新附加装置的建模方法，并在工业用非重复充装焊接钢瓶生产线建设中，进行了焊接专机的改装实践.利用虚拟技术确保机床改装一次性成功，降低老旧设备改造的工程成本，在生产中能满足工艺要求.     

虚拟制造中仿真技术的应用

虚拟制造系统是现实制造系统在虚拟环境下的精确映射,是利用计算机模型仿真真实系统中的物理和逻辑活动。本文指出仿真是实现虚拟制造的主要手段。仿真在制造系统中的应用按照人的介入与否分为一般仿真层和虚拟现实层。分析了两层之间的联系与区别,列出了各层仿真的主要内容和可实现的程度;介绍了目前主要的虚拟制造仿真软件;最后,给出了三维动画表示的生产线虚拟仿真的一个实例。     

数字化与网络化制造

２１世纪的企业要在市场竞争中求得生存与发展,就要求企业从信息集成走向知识集成,制造系统与过程的建模、仿真以及虚拟设计、虚拟制造为这种集成提供了重要的手段。利用网络技术实现设计制造各环节间信息／知识共享与集成,对制造业起到了关键的支撑作用,这使得未来的企业制造活动建立在数字化和网络化基础上。     

虚拟再制造技术初探

虚拟再制造是实际再制造过程在计算机上的本质实现,以信息、仿真和虚拟现实等多种技术为基础,在计算机上实现再制造过程中的虚拟检测、虚拟加工、虚拟控制、虚拟实验、虚拟管理等再制造全过程的一项前沿技术。阐述虚拟再制造的定义和具体的研究层次,分析它的研究现状以及关键技术特点,探讨虚拟再制造与实际再制造和虚拟制造的关系,并与多种先进制造进行比较,最终提出虚拟再制造的应用前景。     

虚拟制造组织中服务定位机制研究

提出一种基于公共对象请求代理结构(Common Object Request Broker Architecture,CORBA)的多自主体系统(Multi-agent System,MAS)体系结构作为虚拟制造组织(Virtual Manufacturing Organization,VMO)的组织框架和信息基础设施,以跨越成员企业之间在位置、网络、协议、平台、语言以及数据结构和类型等方面的异构性,实现在语义和应用层上的互操作。在此基础上提出一种基于中间Agent的服务定位机制(Setvice Location Mechanism,SLM),以支持虚拟制造组织的构建以及成员企业间的通信、互操作和资源／服务共享,并在开发的VMO概念原型系统上进行了实现和验证。     

基于虚拟制造(VM)技术的工具类产品设计研究

文章基于虚拟制造技术,以工具类产品--摘果器设计为例,对其进行了虚拟建模,产品使用环境仿真,和同类产品优缺点对比,虚拟装配等方面的具体研究.展现了虚拟制造技术在产品开发中扮演的重要角色,最终提出了基于虚拟制造技术的工具类产品开发模型流程图,以便于为工具类产品提供一个迅速,方便,高效的设计模式,从而降低成本,缩短产品开发周期,达到产品一次性制造成功的目的.     

虚拟制造技术在模具教学中的应用

虚拟制造技术是制造技术与仿真技术相结合的产物,本文主要介绍如何将虚拟制造技术与模具教学有机的结合,利用先进的教学理念、方法,实现模具教学在虚拟环境下达到仿真效果,通过形象的虚拟使模具教学得到全面提升。     

面向船体曲面分段建造的虚拟流水线生产调度

基于船舶船体曲面分段建造的特点,利用成组技术和流水线生产的原理,提出了面向曲面分段建造的虚拟流水线生产模式,研究了包括生产组织改造和生产调度的关键技术。根据虚拟流水线生产模式的原理,建立作业班组分解模型,并应用遗传算法实现基于虚拟流水线的曲面分段制造生产调度方法。利用上海某造船厂实际数据进行验证,结果表明虚拟流水线生产模式及方法可有效提高船舶生产效率。     

生产系统的集成规划及案例分析

在分析以往制造系统设计存在不足的基础之上,论述面向生产工程的虚拟制造内涵、提出了虚拟制造环境下大批量生产的制造系统集成规划的解决方案,它包括系统布局规划、仿真规划和虚拟漫游规划3个阶段,各个阶段解决系统规划的不同优化问题,并以来自企业的应用案例进行分析,为企业设计优化的生产系统,减少投资风险。     

虚拟制造及其体系结构

本文分析了虚拟制造产生的背景，提出了一种虚拟制造的体系结构，并进一步分析了虚拟制造中建模和仿真过程，最后例举了一个以独立制造岛为基础的虚拟企业结构。     

虚拟制造环境下成本评估技术

介绍了通过历史成本数据矩阵,寻求最小成本路径,估算最小成本和确定最优工艺路径的方法,为虚拟制造和产品设计提供了有效的决策工具。     

虚拟制造中的制造系统建模

为了映射真实系统与服务环境之间的相互作用，分析了在虚拟制造环境下制造系统静态模型和动态模型的建模方法，并通过生产系统预规划和动态规划过程，揭示了该模型具有的支持产品制造全过程的特性，最后阐述了原型系统的结构框架以及工业应用的成果。     

Virtual engineering in design and manufacturing

Manufacturing systems of the future highly demand that the product data are built into the product model,and smooth data transfer to other computer-aided technologies are enabled.Depending on the type of the manufacturing system,it is envisaged that virtual engineering(VE) technologies play a significant role in integrating the computer-based technologies involved in the product's life cycle.Simulations in a virtual world and exchange of real-time product or design data are among the benefits for today's global oriented manufacturing business.To highlight the significance of design as carrier of product data and the key role played by VE technologies to inter-link design,manufacturing and associated components,this paper presents an overview and analysis of the state-of-the-art VE technologies to indicate potential applications and future research directions.     

Research on Evaluation and Management of Networked Manufacturing Resources Based on WUXIASP

1Introduction Themanufacturingresource(MR)isafloorboardofallphysicselementsinproductionactivityabout allproductlifetime.Inatraditionalmanufacturingmode,thecorrespondingdemandsofitarecom monlyputforwardaccordingtodifferentphasesinproductionprocessesandasinglecomputerappli cationsystem;thusitisincapableofmeetingtheneedsofthedecentralizationandnetworkedmanu facturing.Thenetworkedmanufacturingsystem(NMS)isadecentralizingandisomerousmanufac turingentity.ThemanufacturingresourcesinNMS,especially…     

基于知识粒度的移动Agent虚拟企业协作研究

针对虚拟企业产品异地协同设计制造的要求,以及产品知识的复杂性、不确定性和时效性,对基于知识粒度的移动Agent 虚拟企业协作开发系统进行了研究.该系统通过启用不同粒度的封装知识模板,实现对虚拟企业制造资源的重构和封装;通过黑板协同机制实现Agent之间的数据通信及信息共享.实例表明,通过基于知识粒度的移动Agent技术,虚拟企业协作开发系统能够在网络环境下实现对知识的发现、调度和应用,改善网络异地协同合作,从而提高产品开发的敏捷性和降低产品开发成本.     

Virtual fusion: a hybrid environment for improved commissioning in manufacturing systems

Efficiency and quality are major factors contributing to profits in manufacturing systems. Production downtime occurs during commissioning of a new system, adoption of new processes, system faults, or (un)planned maintenance; all of which result in reduced production and profit loss. Current techniques for evaluating change to a manufacturing system rely on simulation and modeling to verify processes, but ignore the physical interactions of the work parts on the system. Implementation techniques to evaluate commissioning focus on identifying issues with the cyber interfaces, ignoring the physical interfaces. To validate the cyber and physical interfaces simultaneously, physical work are sent through the system, resulting in significant costs from scrapped work parts and loss of production time. This research proposes a virtual fusion environment where the physical interfaces between a virtual work part and a manufacturing system can be investigated in real-time, on the physical system, without the expenses associated with physical work parts. The virtual environment includes a virtual fusion filter to monitor discrepancies between the physical and virtual systems, and generate a hybrid virtual-physical input signal to the system level controller for virtualisation of a work part onto a physical system. Experimental demonstrations validate the feasibility of the proposed approach.     

分布式生产系统的信息结构

从信息系统的角度，以一个简化的例子（分布式异步制造系统），对分布式系统建模，并研究了系统硬、软约束的具体实现等方面的问题。编制了分布式异步虚拟生产系统，在Ｎｏｖｅｌ网上进行仿真的结果表明，该信息结构模型是有效的。     

A genetic scheduling methodology for virtual cellular manufacturing systems: an industrial application

Effective solutions to the cell formation and the production scheduling problems are vital in the design of virtual cellular manufacturing systems (VCMSs). This paper presents a new mathematical model and a scheduling algorithm based on the techniques of genetic algorithms for solving such problems. The objectives are: (1) to minimize the total materials and components travelling distance incurred in manufacturing the products, and (2) to minimize the sum of the tardiness of all products. The proposed algorithm differs from the canonical genetic algorithms in that the populations of candidate solutions consist of individuals of different age groups, and that each individual's birth and survival rates are governed by predefined aging patterns. The condition governing the birth and survival rates is developed to ensure a stable search process. In addition, Markov Chain analysis is used to investigate the convergence properties of the genetic search process theoretically. The results obtained indicate that if the individual representing the best candidate solution obtained is maintained throughout the search process, the genetic search process converges to the global optimal solution exponentially.

The proposed methodology is applied to design the manufacturing system of a company in China producing component parts for internal combustion engines. The performance of the proposed age-based genetic algorithm is compared with that of the conventional genetic algorithm based on this industrial case. The results show that the methodology proposed in this paper provides a simple, effective and efficient method for solving the manufacturing cell formation and production scheduling problems for VCMSs.