层次化领域知识库的有效性检查研究

根据复杂产品设计领域知识的特点,建立适合领域特点的集成知识表示模型,并进而建立多层次化领域知识库,阐明知识库有效性检查的原理 与过程,提出适合层次化领域知识库特点的冲突检查方法,并开发多级 领域知识获取系统MKAS。     

Configuration-oriented product modelling and knowledge management for made-to-order manufacturing enterprises

In made-to-order (MTO) manufacturing enterprises (ME), product architectures are usually modularised and components standardised. Product configuration is a key technology for order realisation in MTO–ME and is a typical knowledge-based application. Through a configuration process, product modules or components are selected and assembled according to customer requirements. Product configuration relates to a great deal of knowledge that represents complexity relations among components or modules, such as configuration rules and assembly constraints. Traditional product modelling techniques are focused mainly on physical product modelling and geometric representation, which makes them insufficient to help in the product configuration process. This paper discusses configuration-oriented product modelling and knowledge management for MTO–ME. A general process of product configuration modelling is proposed. The configuration model represents a product family from which a specific configuration solution or product variant can be derived. Actually, configuration modelling is a process which captures and represents product knowledge. In this paper, product knowledge is organised and managed through a knowledge component (KCOM) that includes configuration rules and constraints. A KCOM-based product knowledge representation model is presented. Finally, a PDM system is extended to support product modelling and knowledge management for MTO configurable products .     

基于Internet数据库的开发

针对当前在开发基于Internet的数据库应用中,如何进行DBMS的选型疸,通过对有着几十年历史的传统的结构化关系数据库系统及近年来暂露头角的非结构化网络数据库系统的分析,根据不同DBMS的特点,给出了DBMS的选择方法。     

面向生命周期的绿色产品集成模型的研究

绿色产品集成模型的建立是面向生命周期的绿色产品开发的前提。在分析绿色产品生命周期信息基础上，提出了基于产品结构的多视图集成模型，通过主视图向应用视图的信息映射，满足了生命周期各使能工具的信息需求，同时维持应用信息的差异性和关键性，并对该模型体系的实现提出了具体实施思路。     

基于PDM的案例知识管理系统的研究与开发

通过在PDM系统上建立产品开发知识管理系统实现案例设计知识的快速搜索和匹配并通过新案例的存储丰富设计经验，以此加快产品开发速度，稳定并逐步提高产品的质量。作者为基于知识工程的级进模具设计系统开发了基于SmarTeam的级进模具案例知识管理系统，实现了模具开发案例知识的有效管理。     

因特摩(INTEMOR)系统综述

该文从因特摩系统的现状、结构、功能及特点和应用前景几个方面对INTEMOR系统进行了相对全面的介绍。     

Data format and browser of lightweight CAD files for dimensional verification over the internet

The demand for the use of 3D CAD data over the Internet environment has been increasing. However, CAD data size has deteriorated the communication effectiveness of 3D CAD files. Good design methodology of a lightweight CAD file is required for rapid transmission on the distributed network environment. In this paper, a file translation system is constructed to produce lightweight CAD files from commercial CAD systems by using InterOp and APIs of the ACIS kernel. Using B-rep models and mesh data extracted from the CAD native files, the lightweight CAD files with topological information are constructed as binary files. As the lightweight CAD files retain topological and geometric information, they are applicable to dimensional verification, digital mock-ups, and visualization of CAD files through a CAD viewer. The effectiveness of the proposed lightweight CAD files is confirmed through various case studies on the CAD viewer. This paper was recommended for publication in revised form by Associate Editor Jooho Choi In-Ho Song received B.S. and M.S. degrees in mechanical engi-neering from Kunsan National University, and Ph.D. degree in mechanical engineering from Hanyang University, Seoul, Korea in 2007. From 2002 to 2007, he served as a team manager to develop CAD and PLM systems in CIES in Korea. He is currently a post-doc researcher in the mechanical engineering department in Hanyang University. As he had developed a lightweight CAD viewing kernel for CAD/CAM systems, he received a New Technology Certificate from Korean Government (MOCIE) in 2005. He also received several prizes from the Korean Society of CAD/CAM Engineers in 2003 and 2004. He specializes in geometric modeling, CAD kernels, product design and digital manufacturing systems. Sung-Chong Chung received the B.S. degree with honors in mechanical engineering from Hanyang University, Seoul, Korea, and the M.S. and Ph. D. in mechanical engineering from KAIST, Seoul, Korea in 1979, 1981 and 1987, respectively. Since 1983, he has been a professor in the School of Mechanical Engineering, Hanyang University, Seoul, Korea. In 2000, he received the outstanding paper award from the North American Manufacturing Research Institution of the Society of Manufacturing Engineers. He received the academic research and software development awards from the Korean Society of Mechanical Engineers and the Korean Society of CAD/CAM Engineers in 2003 and 2004, respectively. His research interests include CAD/CAM, control, mechatronics, manufacturing and precision engineering.     

STEP-Based Multiview Integrated Product Modelling for Concurrent Engineering

The demand for high-quality and low-cost products with a short development time for the dynamic global market has forced researchers and industries to focus on various effective product development strategies. Product modelling has been recognised as one of the key factors in determining the success of various product development strategies and for industrial competitiveness now and in the future. This paper proposes a methodology that represents multiview integrated product modelling based on the outcome of a research project on ISO 10303 STEP. The methodology consists of the architecture and information requirements for an integrated product model and a mapping mechanism for the multiview operations of the model, which support product development in a concurrent engineering environment. This methodology will facilitate further research in developing sophisticated product modelling for concurrent product development. ID="A1"Correspondance and offprint requests to: Dr K. S. Chin, Department of Manufacturing Engineering, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China, E-mail mekschin@cityu.edu.hk     

机械设计制造共享资源库建设方案

分析了基于Internet／Intranet的设计现状,讨论了基于浏览器／暇务器(Browser／Server,B／S)模式的机械设计制造资源共享系统的特点,提出了基于Internet／Intranet的机械设计制造资源共享系统模型的体系结构和机械设计制造资源共享库建设方案,通过公共数据中心可方便地实现资源共享,且便于数据的维护、管理与控制。     

对网络时代设计管理模式的研究

通过对企业设计管理模式的探讨和设计,阐明了传统管理模式的种种弊端,介绍了现代企业在网络时代基于网络的设计管理新模式,并重点分析了管理中心、设计中心以及销售中心的职责和它们相互作用的管理模式。     

Using mobile agents to encapsulate manufacturing resources over the Internet

The rapid progress of information and networked technologies, especially Internet/Intranet and Web techniques, is driving a fatal revolution of manufacturing modes/enterprises. Networked manufacturing, as a novel manufacturing mode, has caused profound interest in academic and industrial areas. However, during the transformation from the legacy manufacturing mode to the networked manufacturing mode, there exists a bottleneck, that is, how to integrate the legacy manufacturing resources into networked manufacturing systems. Focusing on this problem, this paper is mainly concerned with developing a novel platform for the configuration and encapsulation of legacy manufacturing resources in networked manufacturing systems. The key point to implement this platform is to adopt a Java solution and mobile agent technologies. With the Java solution, the basic framework for this platform can be realized. Through adopting mobile agent technologies, e.g. Aglets, the encapsulating templates and interfaces for all kinds of manufacturing resources can be developed. Based on the dispatch/return mechanisms of mobile agents, the configuration and encapsulation, information integration and share functions for legacy manufacturing resources can be accomplished well.     

领域知识获取与有效性检查过程集成研究

建立适合复杂产品设计领域特点的层次化领域知识表示模型 ,研究领域知识的有效性检查过程 ,并将领域知识的获取过程与领域知识的有效性检查过程有机集成起来 ,在领域知识获取的过程中实现领域知识的一致性、完整性检查 ,在此基础上开发多级领域知识获取系统 MKAS     

A solution for NURBS modelling in aspheric lens manufacture

Aspheric lenses are widely used as important parts of commercial optical products. Owing to their specific functionality, the aspheric surfaces of the lenses are mostly defined by highly complex functions incompatible with commercial manufacturing systems. This reduces lens data interoperability in downstream lens manufacture processes. It is necessary to represent such surfaces in standard formats such as non-uniform rational B-splines (NURBS) by approximating them without sacrificing their accuracy. This paper presents a solution for improving product data interoperability in aspheric lens manufacture. According to the surface type, the solution employs appropriate methods for approximating NURBS surfaces to aspheric surfaces of each type within a specified accuracy and correspondingly provides a simple way of interfacing lens data with commercial manufacturing systems. Some experimental results demonstrate its usefulness and quality.     

A feature-recognition knowledge base for process planning of rotational mechanical components

A computer-aided process-planning (CAPP) system is a key factor in CAD/CAM Integration. In recent years, expert-system techniques have been introduced into this area. An increasing number of AI-based generative process-planning systems have been developed to automate machine process selection and tools selection. Of these, EXCAP, an integrated knowledge-based system developed at UMIST, distinguishes itself by its flexibility and ease of use. This paper gives an overview of EXCAP and focuses on the feature-recognition knowledge base.     

利用互联网技术实现机械工程图纸的管理

这里论述使用该系统测量齿轮，不但可以测量齿轮一周内的齿轮径向综合误差（△F^ni），也可以测出齿轮的一齿径向综合误差（△F^ni），充分发挥了齿轮双啮测量应有的优势。该系统即可用于测量齿轮的径向误差，也可以依误差曲线的图形对切齿工艺进行分析。     

基于神经网络块的混合型方案设计知识库系统

文中祥描述了神经网络块的功能结构,提出了基于神经网络的混合型专家系统结构框架,阐述了各个模块的基本功能,并成功地将其应用于复杂产品方案设计智能决策支持系统知识库的研制中。     

面向物能资源优化利用的机械产品设计

本文分析了机械产品设计中影响制造系统物能资源消耗的主要因素,并在此基础上提出了一种面向物能资源优化利用的机械产品设计模型,对提高物能资源利用率的产品设计的方法和途径进行了讨论。     

A knowledge based feed-back control system for precision ELID grinding

Newer materials with excellent properties are of recent interest in the optical, electrical and electronics industries. Finishing of new materials for the required stringent specification stated by those industrial applications emerges the innovation of new techniques and processes in the field of manufacturing. Electrolytic in-process dressing (ELID) is one of those new manufacturing techniques which may produce mirror surface finish on various optical and non-optical materials. The easy implementation and the efficiency of the ELID technique have been drawing the attention of the optical manufacturing industries in the recent years. However, further improvements are essential in order to minimize the difficulties experienced during implementation and to extend its suitability for future applications. The authors propose a knowledge based feed-back control system for ELID grinding to eliminate the application difficulties and to improve the effectiveness of the process. This study aims to experiment and to analyze the various features of the developed feed-back control system. The main objective is to examine the effectiveness of the system for precision finishing of optical and non-optical harder materials. The possibilities to reduce the geometrical inaccuracies of the workpiece have been examined in this study. The results show that application of the feed-back control system minimizes the number of correction cycles necessary for precision finishing of hard materials, such as, quartz.     

基于多代理机制的车间制造资源调度管理系统的研究

在分析车间制造资源调度特点的基础上,综合运用多代理机制、规则调度和消息通信机制等技术,建立了适应制造企业车间层生产环境的多代理模型结构。重点研究了多代理机制的实现、基于多代理结构下的通信机制和规则调度机制等关键技术,构建了基于客户机／服务器结构车间制造资源的调度管理系统的体系结构,研究了其工作流程和实现方法,并开发了基于多代理的车间制造资源调度管理仿真系统。