An integrated knowledge reference system for product development

Global product development enables companies to increase knowledge sharing. Consequently, knowledge management (KM) is a key issue in the improvement of the product development process. This paper aims to analyze the knowledge evolution process in product development activities and to propose an integrated knowledge reference system. Based on knowledge characterization of vector and finite state machines, knowledge maturity and knowledge value are discussed, and knowledge and the product are linked by tasks and contexts. The knowledge reference system shows a mutually benefiting relationship between knowledge and the product and is thus an effective tool for KM in product development.     

基于知识的产品概念设计支持系统研究

从产品开发的视角,分析计算机辅助概念设计的过程.结合基于知识的工程环境(KBE),研究知识驱动概念设计的方法,以捕捉更多的设计意图,增加非几何的工程设计能力.探讨基于知识的产品概念设计支持系统的体系结构,并研究其实现的关键技术-知识的表示与获取和设计仿真与评价等.研制支持产品概念设计的原型系统,并通过减速器产品开发示例予以验证.     

New potentials for virtual product creation by utilizing grid technology

Efficient virtual product creation combined with predictive engineering requires high-capacity computing and communication technologies as well as fast and transparent supply of knowledge, information and data. For this purpose, grid technologies offer great potentials for virtual product creation. One objective of grid computing is to perform more realistic simulations for better prediction of effects with reduced costs. This paper describes the approach and methods how engineering analysis problems in product development and manufacturing can be solved in the flexible context of CAE applications and grid computing infrastructure. The presented results are partly achieved in a joint project with partners from research and industry.     

A blackboard-based approach to concurrent process design of injection moulding

The concurrent process design involves the simultaneous considerations of product design, tool design, machine-selection, production scheduling, and cost as early as possible in the design stage, the main theme being to capture and handle a large variety and volume of knowledge. Knowledge-based system is one of the promising approaches to facilitate concurrent process design. In order to manage heterogeneous knowledge bases, an effective architecture is required to implement such a process design procedure, where more than one domain expert is involved. In this paper, blackboard architecture for concurrent process design is presented, a blackboard-based system for concurrent process design of injection moulding being developed and presented.     

基于Internet的分布式设计知识资源检索策略

在产品开发过程中如何快速、有效的为设计人员提供设计知识成为了成功开发一个产品的关键。为了减轻设计人员在海量知识资源中的检索负担,需要一种快速、高效的设计知识资源检索方法,使设计人员可以集中精力于设计活动中的关键阶段。通过对基于Internet的分布式知识资源环境下的检索方法进行讨论,本文提出了一种快速、高效的两级知识检索方法:首先根据“加权关键词匹配定位法”来有效、准确的定位知识站点;然后“约束驱动知识检索”方法在所定位的知识站点中准确获取满足用户意愿的具体知识。两级知识检索方法可以改善原有传统检索方法的有效性,使设计开发人员在分布式知识资源环境下的知识检索效率大大提高。     

基于MAS的挤压型材产品开发知识库系统结构的研究

针对铝挤压型材产品开发KBE（Knowledge-Based Engineering）系统中的知识库子系统,提出了一种基于多智能体系统（MAS）和软总线的知识库结构框架,并对该系统的实现方法和运行模式进行了研究。这种新的知识库结构体系可以较好地解决产品开发中知识松散复杂、管理困难的问题,为产品开发KBE系统的优化高效运行提供了有力的决策支持。     

Scenario-based determination of product feature uncertainties for robust product architectures

Modular product architectures are used by many firms today to achieve a high degree of product differentiation whilst reducing cost through economies of scale. At the same time, the firms are increasing architecture lifetimes to 10 years or more, which brings up new challenges for the development process. Uncertainties regarding future product features need to be anticipated when designing the architecture to minimize modification efforts. Nevertheless, existing approaches for designing modular product architectures are mainly based on static requirements and thereby neglect the dynamics of the market that influence future product features. This paper aims at presenting a method utilizing scenario-planning and simulations in the product range planning process to determine future product features and their uncertainties as a basis for the product architecture design. Possible feature specifications are derived from product environment scenarios and linked to the factors influencing the scenarios, to calculate their expected values and deviations.     

汽车覆盖件冲压CAPP系统的研究

提出了引入KBE和优化方法的汽车覆盖件冲压工艺设计CAPP系统的框架结构,建立了基于特征/知识的产品/工艺信息模型,采用基于特征和知识的智能工艺决策方法制定了覆盖件冲压成形工艺路线,并利用几何优化的方法确定冲压方向,采用关联技术和参数化的方法进行冲压件图半智能化的详细设计和信息传递,直接生成工序件图的三维模型,有利于实现与CAE系统的结合,可直接用于模具设计和制造,实现无试模一次成功     

面向协同设计过程协调和优化的集成过程管理研究

在跨企业协同产品开发模式下,以项目为核心,分析了面向项目全产品开发周期任务流和过程流驱动的机制,根据协同设计过程链驱动的特点研究和开发了集成过程控制系统CDIPM,同时给出了过程综合控制和管理策略、过程活动对象建模、历史知识模板驱动任务划分和渐进迭代式任务分解和优化策略等关键技术的实现方法.     

基于Web面向产品的综合式CAPP系统

文章介绍了一个基于Web面向产品的综合式CAPP系统,包括:采用的Microsoft Windows DNA结构,系统组成及其功能,知识处理,数据库维护和用户管理等主要内容.系统采用国内外流行的Web、XML和组件技术,建立了集交互式、检索式和基于知识的方式于一体的CAPP系统,进行面向企业产品的各类零件进行工艺设计,生成满足生产要求的工艺文件.CAPP系统运行环境为Windows2000,编程语言采用ASP 、JavaScript和VC 等,关系数据库采用Oracle.目前,系统已经应用于沈阳第一机床厂.     

Providing product use knowledge for the design of improved product generations

Current design of improved product generations does not exploit use information from previous products systematically. The emerging shift of manufacturing companies from selling products to providing product service systems, the miniaturization of product-embedded sensors, as well as advances in information technology facilitate a product providers access to operation information of current products, which can be used to improve the development and the quality of follower product generations. The paper presents a framework for the acquisition, aggregation and analysis of product use information as well as for the generation and provision of knowledge for the development of improved product generations. The described approach employs knowledge discovery methods like Bayesian Networks and is supported by an IT prototype of a design assistant system. This prototype has been validated in a use case considering the improvement of a rotary spindle for micro machining.     

面向锻件产品开发的知识建模方法及应用

针对日前锻件产品开发的特点及存在的问题,规划了基于知识的锻件产品开发流程,并根据开发流程,结合开发知识的特点将知识划分为领域知识、实例知识和设计历史知识,提出了面向锻件产品开发的知识建模方法.本文采用规则/框架的综合表达方法对3种锻件产品开发知识进行组织建模,并利用面向对象方法将这3类知识模型集成构建了锻件产品开发知识集成模型.基于该建模方法和ASP.NET平台,采用面向对象语言C#,结合ORACLE数据库技术开发了锻件产品开发系统并得到了有效应用.     

A mixed reality environment for collaborative product design and development

This paper presents a mixed reality (MR) environment for collaborative product design and development. This MR collaborative environment is based on a client/server architecture where multiple users can create and modify product features in a 3D physical space simultaneously. A tri-layer model representation scheme is designed to facilitate product creation and visualization. Intuitive feature manipulation methods and grid-and-snap modes have been designed to support solid modelling in the MR environment. Bi-directional communication between the MR environment and the CAD system ensures any modifications made by one user are propagated to the views of other users for maintaining design data consistency.     

Design for additive manufacturing: Framework and methodology

In recent decades additive manufacturing (AM) has evolved from a prototyping to a production technology. It is used to produce end-use-parts for medical, aerospace, automotive and other industrial applications from small series up to 100,000 of commercially successful products. Metal additive manufacturing processes are relatively slow, require complex preparation and post-processing treatment while using expensive machinery, resulting in high production costs per product. Design for Additive Manufacturing (DfAM) aims at optimizing the product design to deal with the complexity of the production processes, while also defining decisive benefits of the AM based product in the usage stages of its life cycle. Recent investigations have shown that the lack of knowledge on DfAM tools and techniques are seen as one of the barriers for the further implementation of AM. This paper presents a framework for DfAM methods and tools, subdivided into three distinct stages of product development: AM process selection, product redesign for functionality enhancement, and product optimization for the AM process chosen. It will illustrate the applicability of the design framework using examples from both research and industry.     

支持产品协同设计的AD技术与服务层项目人员管理的实现

在产品的协同设计过程中，每个项目都要涉及到众多的工作人员和大量的网络资源。协调好各个人员的工作并且有效、安全地使用网络资源是保证产品设计顺利进行的关键。本文提出并研究了采用活动目录技术来实现协同设计系统的服务层上的项目人员管理需求模式，开发了相应的项目人员管理工具，并且在基于知识的注塑模具和冲压模具设计系统中得到应用。     

再制造设计基础及方法

废旧产品在进行再制造加工前,要进行再制造性评价和再制造工艺设计。而产品的再制造特性主要是由产品设计阶段决定,废旧产品的再制造特性又决定了产品能否进行寿命末端再制造。文中主要探讨了产品再制造设计的影响因素、废旧产品再制造特性评价及再制造加工建模等内容。通过再制造设计的研究,可以为开展科学的再制造提供依据,最大限度地挖掘废旧产品中的蕴含的财富和信息,实现资源的可持续发展战略。     

Incorporating Lifecycle Considerations in Axiomatic Design

At the outset of designing a new product, knowledge about the product is limited, but the designer has a considerable amount of design freedom. Considering the environmental implications of a product design early in the design phase is a crucial step in achieving an environmentally efficient product. By applying the axiomatic approach to a product's design, the designer can ensure that the final embodiment of the product or service satisfies the obligatory and necessary set of functional requirements and constraints, including environmental issues. In this paper we show how the integration of environmental considerations early in the process of axiomatic design can lead to the development of an environmental-friendly product or service. The paper demonstrates an artificial case study of designing a modern manufacturing system. A major issue investigated in this work is the possibility of assessing environmental performance (or environmental-related information) already in the preliminary stages of the design process. An upper bound for the probability of a product failing to satisfy environmental requirements is introduced. In addition, the suitability of lifecycle analysis to the assessment of products during the process of axiomatic design is discussed.     

废旧产品再制造质量控制研究

再制造业能否得到迅猛发展,其中再制造产品的质量能否满足用户的需求起到至关重要的作用.而影响再制造产品质量的因素很多,涵盖了废旧产品再制造的全过程,本文在分析了影响再制造质量的主要因素的基础上,提出了控制再制造质量的主要技术方法及其管理途径,为科学开展再制造质量控制提供了依据.     

废旧产品再制造质量控制研究

再制造业能否得到迅猛发展，其中再制造产品的质量能否满足用户的需求起到至关重要的作用。而影响再制造产品质量的因素很多，涵盖了废旧产品再制造的全过程，本文在分析了影响再制造质量的主要因素的基础上，提出了控制再制造质量的主要技术方法及其管理途径，为科学开展再制造质量控制提供了依据。