基于特征的轴系零部件三维实体模型的建立与拼装

基于三维CAD软件Solid Edge环境,采用二次开发技术和参数化设计技术,提出了基于特征设计轴系零部件的思路,并对该CAD系统中的轴特征拼接平台、轴系零部件的装配平台、特征库和特征参数的数据库的建立进行了详细的论述.     

构建机械类产品快速设计系统的关键技术研究

针对机械类产品的设计特点,结合现代CAD技术提供的技手段,提出了产品快速设计系统的概念,对产品快速设计系统的特征进行了总结.对构建产品快速设计系统时所涉及的基于特征的建模技术、基于关联的部件间建模、基于模型的知识表示、基于事例的产品模型的构建、面向产品设计过程的用户界面设计的关键技术、主模型技术等关键技术进行了研究.     

智能CAD系统中的知识库系统

随着知识工程研究的不断深入和CAD技术的应用普及，知识工程与CAD技术的结合已成为先进制造技术研究的热点。本文在分析基于知识驱动的智能CAD技术的基础上，着重阐述了智能CAD系统中实用知识表示法及知识库系统的结构。     

轴系CAD系统的研究与开发

采用能有效利用标准零件间相似性的二次开发技术和大大提高产品创新能力的参数化设计技术,开发了基于特征的轴系零部件CAD系统,同时对该轴系CAD系统中人机界面的总体结构、特征数据库的建立和虚拟装配的实现进行了详尽的阐述。     

智能CAD技术在电梯机械设计系统中应用

智能CAD技术是人工智能技术(AI)、现代产品设计技术和传统CAD技术相结合的综合性研究领域,它从设计对象的表达出发提出两种设计求解方法,即基于实例的设计CBD和基于原型的设计PBD。本文较详细地论述了基于实例的设计方法,并提出了基于实例设计的电梯门机械结构设计系统。     

基于网络的汽车起重机变幅油缸CAD系统研究

将CAD技术与网络技术相结合，采用面向对象的高级语言Java和JSP技术构建了异地网络化设计平台，实现了基于网络的汽车起重机变幅油缸的远程设计。介绍了基于网络的汽车起重机变幅油缸设计系统的原理、方法和关键技术。并得到了具体的应用。     

机械产品集成设计知识模型的研究与应用

机械产品设计知识的表达、获取是基于知识设计系统的基础和关键。本文以领域本体、主模型、产品控制结构和关联模型环境为基础,用实例和规则综合表达设计知识,并提出了设计知识的自动获取和在线匹配机制。根据本文方法开发的“基于知识的机床夹具CAD系统”已经在某大型航空企业成功地应用于国家重点型号工程的研制,取得了满意的效果。     

特征产品模型及其应用

CIMS的产品模型特征建模技术是新一代CAD/CAM集成系统的基础。文中提出了CAD/CAM产品模型的总体结构和基于特征的产品定义数据模型FPDD以及特征建模系统。讨论了应用FPDD实现CAD/CAM集成的方法,包括基于特征产品模型的工艺知识库及CAPP专家系统原型结构,以及基于特征的NC程序自动生产方法。     

基于CAD模型重用的桥面吊机结构一体化设计

长期承接桥面吊机设计工作的企业积累了宝贵的设计知识,但是一般企业没有建立可配置、可变型的CAD模型,面临新的设计任务时设计人员必须按部就班地从结构设计、三维建模、结构分析等步骤一步步做起,工程师们需花费大量时间去做重复工作。为了解决这一问题,通过建立基于CAD模型重用技术的桥面吊机一体化设计系统,对已有的CAD模型进行合理重用,实现融桥面吊机设计、分析、CAD建模为一体的快速设计。     

UGNX下基于模型定义的阀门数字化设计

随着计算机辅助设计(CAD)技术的发展,基于模型定义技术(MBD)的全三维数字化设计的优越性日趋得到业界重视。作为工业管路系统的常用控制装置,阀门产品设计长期采用以二维工程图为主、三维模型为辅的设计模式,这种模式落后于CAD技术发展趋势。为了提高阀门设计的效率与合理性,提出了基于MBD技术的阀门数字化设计方法。通过分析总结MBD技术的构成内涵,在通用三维CAD软件UG NX平台下,以典型阀门产品为例,建立了基于MBD表示形式的阀门零部件模型、规范了阀门产品MBD数据集的组织与管理,最终完成了基于MBD技术三偏心蝶阀的设计。     

产品数据管理中的设计信息管理

设计信息管理是产品数据管理系统（ＰＤＭ）中的一个重要环节。本文给出了设计系统中设计信息管理的具体数据流程和设计方法,将设计过程与管理过程有效地联成一体,并将算法应用到商品化软件ＩｎｔｅＣＡＤＶ５．０中。     

FuncDesigner—a functional design software system

Engineering design focuses on the development of products and artefacts to satisfy the specified function. Although considerable advances have been made over the last two decades in functional modelling, there is not very much progress on commercial Computer-Aided Design (CAD) systems that really aid the designer in converting functional specifications to concept variants. Based on our previous work on Behaviour-driven Function-Environment-Structure (B-FES) modelling framework, this paper presents a functional design software system, called "FuncDesigner", to support the functional design of mechanical products through functional reasoning steps, including causal behavioural reasoning and functional decomposition. A function object library and a behaviour object library have been developed as well to serve as the knowledge base for the computerised functional modelling environment. The proposed functional design software system has been evaluated with a design example of a terminal insertion unit in an automatic assembly system for manufacturing electronic connectors.     

吸塑模具抽芯机构的三维参数化设计和仿真

针对目前的一些中小型模具制造企业仍停留在运用系统提供的基本功能单纯的进行几何造型设计的阶段,以及对三维CAD技术应用不广、应用水平不高、二次开发能力不强的现状,为此在模具设计中采用三维CAD软件UG、vc++软件、以及Access数据库软件,开发出了能够对吸塑模具抽芯机构进行快速设计的三维CAD系统。该系统通过UG/Open GRIP与UG/Open API的程序之间地相互调用实现了抽芯机构的参数化设计,大大提高了设计效率,并通过抽芯机构的运动仿真避免了运动过程中的干涉,确保吸塑件的顺利脱膜,达到了预想的设计效果。     

机械产品CAD系统设计需求动态响应法研究

介绍一种机械产品ＣＡＤ系统初步设计的新方法－需求动态响应地。该方法以面向 系统分析和设计方法为指导思想，针对机械产品ＣＡＤ系统用户的需求特征及动态变化的共性，结合成组技术的核心思想，通过建立用户需求分析模型，完成需求特征的分类和确定；建立了用户需求与软件开发目标的映射模型，实现用户需求向软件功能目标的映射，再通过需求与软件目标对象的动态偶联，实现机械产品ＣＡＤ系统设计对用户需求的动态响应。     

面向对象的球形储罐CAD系统中的分析与设计

面向对象的软件开发方法对于CAD系统建立完整的系统模型具有明显的优势。通过对球形储罐CAD系统的开发研究，对面向对象方法在软件开发过程中的应用进行分析，探讨了如何利用面向对象方法对STCAD系统进行分析和设计，阐明了面向对象方法在软件开发中的重要作用。     

Web-based CAD viewer with dimensional verification capability through the STEP translation server

To design a CAD viewer on the Web, a file translation system which converts a native CAD file of a commercial CAD to the simplified CAD file is required. However, commercial CAD viewers have used simplified geometric data similar to the VRML format. Thus, it has been difficult to apply such data to the accurate design and dimension examination procedures, in this paper, a STEP translation server supporting most CAD native formats is devised. To apply the STEP file to the precise CAD viewer, an accurate geometric data extraction method from the STEP file is studied. A STEP translator classifies and defines geometric shapes according to the boundary information. Viewing and measurement functions of the developed system verify the geometries, interferences, dimensional errors, human factors, and form errors of the CAD data. In addition, design modification messages are transferred through the markup functions of the system. Collaborators are able to share their design ideas and opinions rapidly and remotely through the XML (extensible Markup Language) open architecture. The effectiveness of the developed system is confirmed through case studies.     

协同集成设计环境的计算机辅助工具

研究了一个协同集成设计环境的计算机辅助工具(Co-CADToolAgent)。首先提出了一个人人交互协同映射模型,用于揭示群体设计人员分布、并行、协同的设计模式,并规范成为一个多Agent协同工作系统。然后提出了一种半透明半明确的协作框架,利用软件Agent直接基于单用户商品化CAD系统开发协同设计系统,构造了CoCADToolAgent的反应式结构和通信支持。最后研究了CoCADToolAgen的网络集成方法。利用该工具Agent成功地将一个单用户CAD系统集成为网络环境下支持人人交互的协同设计系统。     

专业机械CAD/CAE系统软件开发研究

为开发适合用户特定需要的专业软件,以桥式起重机整机结构为对象,以可视化程序设计语言VC为开发平台,采用有机组合出的新型优化算法、组件对象模型(COM)接口技术、有限元分析、命令文件式参数绘图等,实现商品化CAD下专业机械CAD/CAE系统软件的开发,为行业提供了现代设计手段.     

Selecting and prioritizing key factors for CAD/CAM software in small- and medium-sized enterprises using AHP

In today’s fast-paced world, computer-aided design/computer-aided manufacturing (CAD/CAM) systems have become a necessary element in manufacturing industries. Prior to investment in a CAD/CAM system, it is essential for investor to know how to maximize their benefits from buying a new or by changing an existing CAD/CAM system. The purpose of this study is to provide a methodology to assist small- and medium-sized manufacturing companies of Pakistan in selecting a CAD/CAM system. It will also facilitate the software providers in recognizing the current state of affairs as well as preceding problems regarding the application of CAD/CAM in manufacturing firms when assisting them in choosing the direction for future development simultaneously. To accomplish this purpose, data have been collected about current CAD/CAM systems. Important criteria for system selection and parameters for evaluation have also been identified and prioritized. Analytic hierarchy process (AHP) is used as a decision-making technique for identifying and prioritizing important factors for CAD/CAM software selection. Expert Choice (AHP-based software) has been used to validate the results.     

Selecting and prioritizing key factors for CAD/CAM software in small- and medium-sized enterprises using AHP

In today’s fast-paced world, computer-aided design/computer-aided manufacturing (CAD/CAM) systems have become a necessary element in manufacturing industries. Prior to investment in a CAD/CAM system, it is essential for investor to know how to maximize their benefits from buying a new or by changing an existing CAD/CAM system. The purpose of this study is to provide a methodology to assist small- and medium-sized manufacturing companies of Pakistan in selecting a CAD/CAM system. It will also facilitate the software providers in recognizing the current state of affairs as well as preceding problems regarding the application of CAD/CAM in manufacturing firms when assisting them in choosing the direction for future development simultaneously. To accomplish this purpose, data have been collected about current CAD/CAM systems. Important criteria for system selection and parameters for evaluation have also been identified and prioritized. Analytic hierarchy process (AHP) is used as a decision-making technique for identifying and prioritizing important factors for CAD/CAM software selection. Expert Choice (AHP-based software) has been used to validate the results.