Modelling and Evaluation of Manufacturing Systems Using Dedicated Petri Nets

The design of a manufacturing system requires modelling and performance evaluation techniques. To support this process, a modelling method based on Petri nets is proposed in this paper. A new class of coloured Petri nets is introduced, which is well suited to the modelling of manufacturing systems. Using this net class, the structure and the work plans of a manufacturing system can both be modelled separately. A library of model templates helps to create large models. The different model parts are merged automatically to create a complete model of the manufacturing system. Measures of interest can be obtained from the model by numerical analysis or simulation, showing its performance and dependability. The usefulness of the approach is shown by applying the proposed techniques to a real-life manufacturing system.     

智能制造技术与系统的发展与研究

介绍肾制造技术与智能制造系统产生的背景与科学意义、分析国内外的发展现状与关键问题。讨论智能制造技术及系统与人工智能、计算机集成制造系统的关系。提出发展先进智能制造系统所必须解决的关键技术基础,强调人的智能在制造系统中的重要作用。未来智能制造系统必然是以高度的集成化和智能化为特征的自动化制造系统。     

基于创新的机械产品快速响应设计/制造的关键技术及其应用研究

针对机械产品，首先介绍新产品开发中计算机辅助创新技术；而后阐述针对用户需求的快速响应关键技术，包括计算机辅助模块化设计技术，基于FEM的变量化结构快速优化技术，基于知识工程（KBE）的特定产品快速开发系统构建，基于CAx的快速设计／制造系统的集成，以及特定机械产品快速设计／制造软件系统的开发工具研究。最后以实例介绍了该技术的应用状况，以此来阐述产品快速设计／制造技术开发的可行性、必要性及其模式。     

分布式网络化制造系统构想

从全球化趋势,市场特征和科学技术发展等方面讨论制造模式变革的必然性,提出一种面向新世纪的分布式网络化制造系统的初步构想,并就其特点及关键技术进行阐述,通过原型系统从原理上实现了这一构想。     

Manufacturing Resource Planning Technology Based on Genetic Programming Simulation

Network-based manufacturing is a kind of distributed system, which enables manufacturers to finish production tasks as well as to grasp the opportunities in the market, even if manufacturing resources are insufficient. One of the main problems in network-based manufacturing is the allocation of resources and the assignment of tasks rationally, according to flexible resource distribution. The mapping rules and relations between production techniques and resources are proposed, followed by the definition of the resource unit. Ultimately, the genetic programming method for the optimization of the manufacturing system is put forward. A set of software for the optimization system of simulation process using genetic programming techniques has been developed, and the problems of manufacturing resource planning in network-based manufacturing are solved with the simulation of optimizing methods by genetic programming. The optimum proposal of hardware planning, selection of company and scheduling will be obtained in theory to help company managers in scientific decision-making.     

EDM石墨电极快速研磨成型研具的开发研究

简介Hauseman研磨研具的特点、制造要求和制造方法;对研具配方进行深入的理论分析,在此基础上,通过实验获得研具制造的最佳配方,并进行了研磨实验给予验证。     

面向RMS的公理化设计分解耦合性研究

首先介绍了可重构制造系统和公理化设计的基本概念,然后对可重构制造系统进行了二级分解,选取了其中非耦合情况下和准耦合情况下的案例,进行了可重构制造系统公理化设计,提出了X是算子的概念,并赋予了,新的概念。创新的利用公理化设计的方法对可重构制造系统进行相应的拆分与重组:根据市场需求,将整个制造系统拆分成具有部分功能组合的制造系统;将各个功能组合,组成整个制造系统。这对于提高制造系统的利用率,快速应对市场需求具有十分重要的意义。     

The analysis of flexible manufacturing systems for reliability

Flexible manufacturing systems (FMS) constitute a considerable capital investment which must be fully utilised by uninterrupted production. The analysis of reliability at planning and development stages in the implementation of FMS is essential, since it can change both the system design and the operating philosophy to give improvements in the overall system performance. The main objective of this paper is to propose a technique for assessing the reliability of flexible manufacturing systems and further to discuss the unsuitability of the traditional reliability techniques in the study of such systems. It is shown that simulation studies in thereliability of flexible manufacturing can be applied in the analysis of alternative approaches to system design. The key terms, ‘Manufacturing Capability’, ‘Production Efficiency’ and ‘Demanded Production Lead Time Success Ratio’ are introduced as measures which can assess a system's performance. A typical flexible manufacturing cell is then analysed for reliability using predicted reliability data. The effect of equipment redundancy, buffer stock size and production priority rules on the cells performance are finally discussed.     

网络化制造系统配置环境及其实现途径

根据“扁平式”结构的系统配置建模特征及其在实施网络化制造系统中的作用，提出了基于Web的网络化制造系统配置环境的基本框架及其关键技术，以及实现远程制造模式的制造资源建模、虚拟现实技术和网络技术等的系统应用方法，并着重分析了网络化制造系统配置环境的关键环节，提出了有效的实现逻辑和解决途释。同时，通过平台实例分析和展现远程制造资源建模技术及系统配置与评价等来选择和组建网络化制造系统配置环境。     

敏捷化可重组制造系统及其布局原则和方法研究

21世纪是全球化市场竞争的时代。为了适应快速变化的市场需求,本文介绍了一种新型的制造系统模式——可重组制造系统(RMS,Reconfigurable Manufacturing System),讨论了RMS的产生背景,并阐述了RMS的定义及特征。在此基础上,进一步研究了RMS物理组态的基本模式,探讨了基于经济性分析的RMS系统布局原则和方法,并成功地应用一个案例进行了具体的分析。     

网络制造信息系统特征及基于DNA技术的制造应用解决方案

从企业制造信息系统的现状出发 ,从软件体系结构和功能等角度详细分析了制造信息系统存在的问题 ,以及先进制造模式对企业制造信息系统的需求 ,阐述了 Windows DNA的特征 ,提出了以 DNA技术为核心 ,从底层设备控制到顶层商务应用等不同层次和领域的应用系统解决方案 ,以构建一种新型、分布式、网络化制造信息系统实现我国制造管理软件的跨越式发展     

零件轮廓测量机安全监测系统的设计

为适应现代先进制造业质量检测自动化的需要,研究开发能够在线非接触、高精度自动检测的智能三坐标测量机已经成为制造业发展的必然趋势,其中机器视觉检测技术的应用为实现复杂自由曲面的自动化检测提供了技术支持。介绍了零件轮廓测量机的工作原理,分析了回转工作台和偏心调整机构在回转体零件测量系统中的作用。采用合理的图像处理技术,完成了包括测量工位上异常物体的检测、工件类型识别和工件位置检测等功能在内的图像识别系统的设计。     

人工复眼的研究进展

复眼是自然界中常见的一种视觉器官,常见于节肢动物中,其有着极高的视场角、低像差、低失真、高时间分辨率、高空间分辨率和无限景深等优点,近些年受到较大的关注。概述了最新的复眼制作工艺和成像系统,介绍了常用的制作复眼透镜的工艺技术,同时还介绍了复眼透镜的成像系统。最后,对人工复眼系统的研究进行了展望。     

A method for assessing geometrical errors in layered manufacturing. Part 1: Error interaction and transfer mechanisms

Geometric accuracy of components is one of the most important quality characteristics in layered manufacturing processes on which most rapid prototyping (RP) techniques are based. Layered manufacturing is an approximate fabricating process in which the final geometric error of the physical part is affected, not only by the approximation technique used, but also by the fabrication process. Errors that occur in one layer could propagate and transfer to other layers causing an accumulated error effect in the process. In this paper, a concept of disturbance error is introduced to describe the effect of accumulated errors in the fabrication process. A physical model is presented to describe error interactions and error transfer mechanisms in the layered manufacturing process. A geometrical model is developed using surface approximation techniques to describe the relationships of the geometrical errors. It is shown that although the complexity of the part geometry is not directly related to the manufacturing process, it will affect the geometrical errors of the part produced.     

数字制造的概念与关键技术

阐述数字制造的基本概念与内涵,全面介绍数字制造的关键技术和应用,并提出数字制造的发展趋势。     

塑料注射成形仿真系统HSCAE3D的关键技术

论述了注塑成形过程仿真系统HSCAE3D的关键技术和创新点。实验和实践证明 ,HSCAE3D系统为注塑制品和模具的虚拟制造奠定了坚实的理论和技术基础 ,构成了注塑制品成形质量全面控制的核心技术     

阀门产品的装配规划系统研究与应用

为满足制造企业对装配建模、装配序列规划及装配工艺方案设计等技术的需求,设计和开发了具有工程应用价值的复杂产品装配规划与仿真系统AeroAssem。介绍了系统的总体结构并结合在阀门装配的经验,以典型产品为例分别阐述了各主要功能模块所采用的关键技术及其应用情况。通过与国外装配规划系统相比,分析了系统在矩阵提取、序列规划及工艺图等方面的优势。AeroAssem系统为复杂产品的数字化装配规划提供了较为全面的、具有实际工程应用价值的解决方案。     

Artificial immune system-based algorithm for the unidirectional loop layout problem in a flexible manufacturing system

Facility layout design is a significant aspect of designing any manufacturing setup and it has a huge impact on the performance of the manufacturing system. Reductions in operating expenses in a manufacturing system is greatly achieved by a good layout design. The problem of finding an optimal layout is hard and deterministic techniques are not suitable for large-sized problems. In this paper, a two-phase layout design is developed. As a first phase of layout design, an artificial immune system (AIS) algorithm is proposed for solving the unidirectional loop layout problem with the consideration of both min_sum and min_max objectives. The computational results showed that the AIS algorithm is efficient in solving layout problems and producing good-quality solutions. In the second phase, shortcuts are introduced in the flow path of the loop layout to enhance the performance of the system. The position of the shortcut in the loop which gives the minimum material handling cost is discovered.     

Multi-degree-of-freedom motion error measurement in an ultraprecision machine using laser encoder — Review

Recently, in accordance with the increasing market demand for ultraprecision technology, a high precision multi-degree-of-freedom displacement measurement technology has become important for industrial applications such as the field of manufacturing and inspection because those physical quantities, linear and angular displacements, are key parameters for keeping and improving quality control of a production system. A number of instruments capable of precise multi-degree-of-freedom measurements have been built and some novel techniques have been introduced. The current state-of-art techniques for multi-degree-of-freedom motion error measurement in a linear stage using laser encoder-implemented system are reviewed. First, we summarize the basic principles behind the measurement technology of the motion error in a stage and simple encoder system. Next, the basic design principles of practical laser encoder system are discussed using the experience of past and existing cases to refer to the important points and the major scientific results. The current trends in the field are significantly discussed, including the novel techniques under construction and advanced technologies. Lastly, the future of multi-functional laser encoder-implemented system, highlighting the kinds of new science upcoming in the next few years, is discussed.     

基于网络化制造ASP平台的项目协同管理系统的研究

分析了网络化制造ASP平台上项目协同的特点,给出了基于ASP平台的项目协同管理系统的体系结构模型,提出了项目协作中的协同决策算法以及基于web的项目计划与进度控制技术的实现方法,并初步用ASP,VB.NET以及XML等技术实现了其原型--基于WUXIASP平台的项目协同管理系统AlliPM.