面向对象的实体造型及其数据存储方法与实现

现代的产品设计是面向用户、基于新知识的设计,有别于过去基于经验的传统设计方法,通过面向对象的表达模型,将可以把用户需求、产品数据、设计过程、设计方案封装在一个实例中,体现了功能驱动、面向市场的现代设计特征。文章介绍了以此方法为指导,利用Autodesk公司推出的开发软件包ObjectARX以及VC++6.0为工具开发的家具CAD系统,其中运用面向对象的封装机制来对家具设计对象加以描述,对实际设计中的具体家具对象加以抽象的数学模型化、实例化为具有智能行为的智能实体,并方便地对设计实例数据的获取和存储,为二次开发中实体造型及数据信息的提取提供了思路。     

基于主参数信息模型的多实例库设计

产品信息模型和实例库的设计是基于实例产品设计的基础．用主参数封装零件、组合件和产品的信息，建立了主参数信息模型，实现了表格驱动的产品级参数化设计技术．在此基础上提出一种新的多实例库设计方法，该方法数据冗余少，信息关联度强．根据文中方法开发的“基于知识的机床夹具CAD系统”已经成功地应用于某大型航空企业，取得了满意的效果。     

产品性能因素描述构架的建立

产品性能作为产品设计的核心，贯穿产品设计的整个过程，抓住产品设计的共性，无疑是产品设计的关键。采用知识工程中的因素空间理论作为理论支撑，基于三层调和功能基础的统一功能分类表达，构建了以统一功能表达分类为维名称的产品性能因素描述构架，并对此构架空间的属性进行了理论分析。为了更好地理解构架空间的概念，描述了具体产品按照性能因素纳入构架空间的5个主要步骤。产品性能因素描述构架的建立，不仅使产品在性能级抽象层次上获得了表面的空间，更重要的是它为产品性能的量化提供了坐标参考，也为分布式资源环境下基于性能驱动的产品检索提供了知识获取依据，从而使CAD技术有望在性能驱动的产品概念设计阶段得到应用。     

产品设计知识重用研究

产品设计是一个知识积累－重用的循环上升过程，而产品设计知识的管理、利用仍然处于杂乱的状态。针对不同的设计知识形式，采用面向对象技术将知识对象封装成不同的知识单元，综合利用不同的知识表示方法来描述知识单元，从而建立集成于设计对象的产品设计的多类型、多层次知识表达模型，提出了产品设计知识重用概念模型。     

支持动态变型设计的多领域系统知识建模与推理求解

基于Modelica语言的多领域系统建模关注物理建模和参数优化等问题,缺乏对产品变型设计的支持.通过扩展多领域基本仿真模型,提出一种结构待定和参数待定的变型产品结构模型.该模型按照参数约束、部件约束和模型约束等知识表达规范融入产品设计知识和经验,采用推理机推理确定产品的结构和参数,实现了基于仿真的动态变型设计.最后以实例验证了动态变型设计方法的实用价值.     

一个面向服务架构的产品设计资源共享系统

研究产品设计中远程设计资源的封装、发布和获取以及系统开发的相关问题。分析面向服务开发的特点，指出将设计资源按面向服务架构封装成Web服务是实现设计资源获取和集成的有效途径，并给出具体的系统架构。探讨基于Java的系统开发技术方案，并以协同设计中约束求解器的封装为例进行了开发，实际运行表明该系统架构的合理性和开发技术方案的可行性。     

AutoCAD环境下面向对象参数化设计的实现

文章论述了一种面向对象的参数化设计方法。采用基于有向无环超图的约束表示，完整的建立参数化模型，不仅可以表示简单约束关系，还可以方便的表示元素间的双向约束。在交互绘图的过程中获取约束关系并保存，实现参数驱动。利用功能强大的0bjectARX[1]进行AutoCAD上的二次开发，采用面向对象的技术，充分利用0bjectARX的类库，有效发挥其封装性和扩展性，在Windows环境下和VC 结合编程，实现参数化设计。     

支持自顶向下设计的产品功能建模技术

自顶向下的设计模式符合一般的设计规律，而以几何建模技术为主的各种CAD系统难以真正地对这一过程提供支持。本文介绍了一种基于功能单元和功能特征的产品功能模型，它能够表达产品的功能结构和功能关系，并建立对零件形状特征的功能约束。功能建模系统同基于特征的产品建模系统相连接，能够实现自顶向下的产品设计。     

支持自顶向下设计的产品功能建模技术

自顶向上的设计模式符合一般的设计规律，面对几何建模技术为主的各种ＣＡＤ系统难以真正地对这一过程提供支持本文介绍了一种基于功能单元和功能特征的产品功能模型。它能够表达产品的功能结构和功能关系，并建立了对零件形状特征的功能约束。功能建模系统 基于特征的产品建模系统相连接，能够实现自顶向下的产品设计 。     

基于集成化知识的产品概念设计技术研究

从用户知识出发，通过对用户内隐性知识的获取、表征、传递、运用的研究，探讨了“用户意象与设计知识”的映射以及“特征基、特征和风格”三层表达体系；建立了用户内隐性知识的获取、表征与运用模型，设计知识的表达模型，用户知识与设计知识的整合模型；提出了基于集成化知识的产品概念设计理论，以手机设计系统为例进行了验证，支持用户和设计师在同一个平台上协同工作，为产品协同设计、网络化设计提供一致的知识体系。     

面向创新设计的产品实例种群基因研究

借鉴生物工程思想和方法,面向产品创新设计,对产品实例种群基因进行详细论述和研究。通过对产品实例种群的定义和划分,构建产品实例种群表达模型对产品基因进行描述,通过产品实例分解层次树和产品实例种群基因树,进而获得了产品实例种群基因,并对产品实例种群基因进行表达。这种产品基因获取和表达方法有助于设计知识的规范、积累和重用,最后结合锁扣把手产品实例,对产品实例基因的获取、表达进行详细说明。     

Semantic Web based innovative design knowledge modeling for collaborative design

This paper describes a study about how to use the Semantic Web technologies for innovative design knowledge modeling in a multi-agent distributed design environment. Semantic Web based knowledge modeling for innovative design is proposed as prelude to the meaningful agent communication and knowledge reuse for collaborative work among multidisciplinary organizations. A model for innovative design is proposed at first, based on which a knowledge schema is brought forward. For sharing the design knowledge among an internet-based or distributed work team, even globally, A RDF-based knowledge model is presented to realize its representation on Semantic Web. A Semantic Web based repository for innovative design and its API for topper Semantic Web applications have been also constructed. The proposed knowledge modeling extends traditional product modeling with capabilities of innovative design, knowledge sharing and distributed problem solving, and is employed as a content language within the messages in the proposed multi-agent system architecture. The proposed approach is viewed as a promising knowledge management method that facilitates the implementation of computer supported cooperative work in innovative design of Semantic Web applications.     

基于领域知识的个性化协同商务推荐系统

基于领域知识与顾客购买倾向相关联的事实,从知识表示、知识获取、系统实现三个方面研究了个性化协同商务推荐系统的实现策略。知识表示研究了自然语言的本体表示,主要包括：知识本体描述、模糊关系设计、概念关联抽象和公理修正四个部分;知识获取采用多层次领域知识获取和基于数据挖掘的智能知识获取两种方法,对知识的形式化和结构化进行了研究;基于J2EE技术创建了由客户端、服务器端、存储系统组成的协同商务推荐系统的结构模型。最后通过测试网站对系统的有效性进行了验证。     

面向并行设计的智能决策支持系统研究

基于并行设计支撑环境讨论了智能决策支持系统的重要性，论述了基于知识的并行设计过程和基于小循环的并行设计过程模型，建立了复杂产品并行智能决策支持框架，阐明了适合并行设计智能决策支持系统的领域知识描述模型，并以方案设计智能决策支持系统为例进行了验证。     

Research on an active knowledge push service based on collaborative intent capture

The quality of a knowledge service influences the quality, efficiency and innovation of product conceptual design. Existing approaches lack intelligence and individuation when providing a knowledge retrieval service via rules and cases. In this paper, we propose a framework of an active knowledge service based on collaborative intent capture to assist product conceptual design. First, a collaborative intent capture model is constructed through the study of the expression and capture of collaborative intent; second, a framework and a process of active knowledge push based on collaborative intent capture are designed after analyzing the method of knowledge resources acquisition based on the constraint satisfaction theory. Finally, match algorithms for text content are studied. Based on the above research achievements, a prototype system of a collaborative design and active knowledge service platform (C-AKSP) has been developed for providing a knowledge service and assisting product conceptual design. An example, the conceptual design of a machine tool spindle system, is used to validate the proposed theories for the model, the framework and the algorithm. As a result, C-AKSP can provide a superior knowledge service that meets the designer's knowledge needs.     

Extended object model for product configuration design

This paper presents an extended object model for case-based reasoning (CBR) in product configuration design. In the extended object model, a few methods of knowledge expression are adopted, such as constraints, rules, objects, etc. On the basis of extended object model, case representation model for CBR is applied to product configuration design system. The product configuration knowledge can be represented by the extended object. The model can support all the processes of CBR in product configuration design, such as case representation, indexing, retrieving, and case revising. The presented model is an extension of the traditional object-oriented model by including the relationship class used to express the relation between the cases, constraints class used in the product configuration knowledge representation, index class used in case retrieving, and solution class used in case revising. Therefore, the product configuration knowledge used in the product configuration design can be represented by using this model. In the end, a metering pump product configuration design system is developed on the basis of the proposed product configuration model to support customized products.     

An Internet-based intelligent design system for injection moulds

The rapid growth of Internet and information technologies in recent years provides a solution to support and facilitate collaborative product developments among different geographically distributed enterprises. An effective and feasible tool to aid the collaborative development of injection moulds can be realized by developing an Internet-based mould design system as one of the modules of a collaborative product development system. This paper presents a prototype Internet-based intelligent design system for injection moulds. The architecture of the system consists of an interactive KB mould design system embedded in an Internet environment. A Java-enabled solution together with artificial intelligence techniques is employed to develop such a networked interactive CAD system. In this system, the computational module, the knowledge base module and the graphic module for generating mould features are integrated within an interactive CAD-based framework. The knowledge base of the system would be accessed by mould designers through interactive programs so that their own intelligence and experience could also be incorporated with the total mould design. The approach adopted both speeds up the design process and facilitates design standardization which in turn increases the speed of mould manufacture. A practical case study is presented to illustrate the operations of the Internet-based mould design system.     

Towards computer-aided configuration design for the life cycle

In modern design, life-cycle concerns such as recycling and service are receiving increased attention. The configuration design phase, where the product and component structure is established, is of particular importance when designing for the life cycle. In this paper, the foundation for a CAD system supporting configuration design for the life cycle is presented. A prototypical CAD system, called CODA (Configuration Design of Assemblies), is under development based on this foundation. A discussion on the supported product and component representation is given, followed by a portrayal of some of the capabilities to support life-cycle design. Specifically, requirements are identified for the information needed to support design for assembly, disassembly, service, recycling, and reuse. A case study involving the (re)design of a hand-held tape recorder with respect to improved disassemblability and recyclability is utilized to highlight some of the capabilities of the current system. With the new product and component representation embodied in CODA, improved support over current CAD systems is provided for configuration design and life-cycle design assessments.