基于软件总线的遗留CAD系统再开发

探讨从遗留的CAD系统中获得有效信息、组件的方法和过程,结合当前CAD领域的新发展,提出一种新的基于软件总线体系结构的CAD系统模型,并分析了组成该模型的各组件的功能特性。该系统具有较好的开放性与集成性,使处于异地的设计人员能协同工作。文中也给出了该体系结构在博士CAD系统中的应用实例。     

一种CAD系统组件模型的组合技术及其实现

当前CAD系统中采用的组件模型主要有两类：标准组件模型和自定义组件模型。尽管这两种情况都有成功的例子，但是不能完全照搬成功经验。在分析了当前CAD开发中面临的挑战后，讨论了组件模型的选择策略，并给出了一个较好的解决方案——在标准组件模型的基础上增加一些新的特征和技术。最后，提出和实现了一个在COM组件模型基础上组件复用和扩展的新技术。     

商机即将到来,Spatial你准备好了没有?——访Spatial公司全球市场销售服务副总裁Jerry Walters先生

组件技术,倍受青睐 随着传统CAD系统在工业界的应用普及,现代设计问题的复杂化、智能化,以及随之而来的CAD软件复杂程度的增加和各个不同应用系统间相互操作的现实需要,人们希望CAD系统具有极佳的开放性同时又能"搭积木"似地自由拼装形成不同的功能配置,软件工程技术特别是组件开发技术的研究应用和逐渐成熟为解决这一问题提供了坚实的基础.     

虚拟原型多体动力学约束模型研究

并行工程角度出发的机械虚拟原型是集成了产品的设计、分析，不断迭代、优化的过程，模型的协调一致性是保证设计过程完整的关键，如产品模型在CAD模型与机械多体动力学模型中的一致性表达。在这种观点下，该文提出在建立基于组件的机械系统虚拟原型时，从CAD中抽取多体动力学模型构件的物理属性，研究了国产三维实体设计软件CAXA环境下，基于多刚体系统动力学笛卡尔方法，从CAD模型映射多刚体动力学分析模型语义的实现方案。分析了多刚体系统动力学模型语义下，多体动力学约束模型坐标基变换关系的抽取。实验结果表明，从CAD中抽取多体动力学模型的物理属性的方案是可行的。可以用于建立基于组件的多体系统虚拟原型的分析模型，实现自主开发设计、分析集成的机械虚拟原型。     

基于系列化配置原理的产品设计技术研究

在分析零件事物特性表的基础上,提出了基于系列化配置原理的产品设计技术.分析了使用该技术的产品开发的一般流程.研究了将产品配置和工艺配置在同一配置表中的存储技术;从三维CAD产品模型中进行特征提取的算法;零件工序简图的自动生成技术等关键技术和算法.以发动机气门产品为研究对象,使用UML的包图设计了发动机气门产品设计系统的组件模型,基于该组件模型和SolidWorks 三维CAD平台,使用Visual C 6.0实现了原型系统.     

基于组件结构的软件二次开发接口的设计与实现

提供二次开发手段是许多像CAD系统等应用软件的必要功能，文章提出了利用组件技术实现应用软件二次开发的接口模型。该模型结构层次清晰，各模块接口规范，易于扩充，并结合实际开发的应用系统，详细地分析了该模型中各组成部件的结构、功能和实现方法。     

开放性测试软件体系结构研究

开放性测试软件体系结构是实现测试系统可扩展性、可移植性的关键,减少测试系统开发和维护费用的关键.TestStand提供了许多实现开放性测试软件体系结构的特征.以TestStand为核心,提出了一个开放性测试软件体系结构的基本方案,并介绍了组成测试软件体系结构的各个组件并对其进行了详细分析.     

计算机辅助结构设计与分析的集成框架研究

针对计算机辅助结构设计和分析的集成问题,设计了一种基于统一模型库 方式的组件式CAD/CAE 集成框架,以结构CAD/CAE 集成模型库为框架底层,以几何造型、 可视化交互、第三方CAD、第三方CAE 等组件为中间组件层,以空间结构设计子系统、空 间结构分析子系统为上层应用层,提供空间实体建模、工程模型管理、多种有限元模型分析 与计算等功能,并应用于港口码头的结构设计及有限元分析。     

一种开放式数控系统刀具运动轨迹验证方法

为了更准确的仿真五轴数控机床各运动轴的运动情况,提出一种开放式数控系统刀具运动轨迹验证方法.本方法从运动控制组件中采集运动控制数据,利用五轴机床机构运动学模型,将运动控制数据转换为工件坐标系下刀具的运动轨迹,并以三维线框方式显示.通过CNC系统与CAD系统STL模型数据的交换,实现了刀具运动轨迹与CAD设计模型的分析比较,并设计了轨迹误差计算模型,可以定量分析仿真的刀具运动轨迹.最后通过实验验证了方法的正确性.     

基于软件体系结构的WEB_MIS应用平台设计

基于软件体系结构的软件设计方法和功能复用的组件技术，本文提出了一个适用于Web应用系统、与具体的业务逻辑和数据松散耦合的NTier组件模型，并运用ASP．NET的组件技术和Web服务开发了N-Tier组件模型的组件体系，构建出一个可进行二次开发的具有开放性、通用性、重组性的WEBMIS应用平台。通过该应用平台开发人员仅需进行简单的应用数据和逻辑定义即可实现Web应用系统的自动生成。     

CAD系统的Broker-Agent结构

本文在研究以往的以数据为中心，以执行为中心和面向对象的几类ＣＡＤ系统模型的基础上，着眼于ＣＡＤ系统的开放性和有效性，逐步提出了ＣＡＤ系统的Ｂｒｏｋｅｒ－Ａｇｅｎｔ结构，并详细研究了结构中Ｂｒｏｋｅｒ和Ａｇｅｎｔ的功能实现，之后进一步分析了Ｂｒｏｋｅｒ－Ａｇｅｎｔ结构对ＣＡＤ系统构成的影响，最后给出了该结构的应用实例。ＣＡＤ系统Ｂｒｏｋｅｒ－Ａｇｅｎｔ结构的提出为更开放和更有效的ＣＡＤ系统建模打下了     

CAD支撑系统构件—软总线模型

在分析开放系统的特点和CAD支撑系统的具体需求的基础上,提出了CAD支撑系统构件-软总线模型（CSB模型）,在该模型中,图形功能模块和应用程序都被封装成为彼此独立且便于复用的构件,由软件总线实现集成,解释型和编译型两种类型程序语言开发的应用构件在系统中共存,并可在运行态动态增加/删除;同时,由总线适配器、解释器和应用服务代理组成的应用服务界面代理了构件之间复杂的通信过程,完成异构数据向同构数据的转换,使构件更专注于功能实现,根据CSB模型实现的一个开放的CAD支撑系统OpenDesign∧TM已经成功实现了产品化,应用实践证明,基于CSB模型的CAD支撑系统效率较高,具备比较好的互操作性和伸缩性,系统开放程度增加。     

A layered architecture for uniform version management

Version management is a key part of software configuration management. A big variety of version models has been realized in both commercial systems and research prototypes. These version models differ with respect to the objects put under version control (files, directories, entities, objects), the organization of versions (version graphs versus multidimensional version spaces), the granularity of versioning (whole software products versus individual components), emphasis on states versus emphasis on changes (state-versus change-based versioning), rules for version selection, etc. We present a uniform version model-and its support architecture-for software configuration management. Unlike other unification approaches, such as UML for object-oriented modeling, we do not assemble all the concepts having been introduced in previous systems. Instead, we define a base model that is built on a small number of concepts. Specific version models may be expressed in terms of this base model. Our approach to uniform version management is distinguished by its underlying layered architecture. Unlike the main stream of software configuration management systems, our instrumentable version engine is completely orthogonal to the data model used for representing software objects and their relationships. In addition, we introduce version rules at the bottom of the layered architecture and employ them as a uniform mechanism for expressing different version models. This contrasts to the main stream solution, where a specific version model-usually version graphs-is deeply built into the system and version rules are dependent on this model     

The architecture of an information tool for de-mining: mine identification core module (MICM)

In this work the architecture of a mine identification core module (MICM) system is presented. This system focuses on the objects to be identified rather than the sensor technology, where most R&D efforts are concentrated. Fusing sensorial with accumulated data, it could be the base of a sensor independent decision support system forming the common core of the future multi-sensorial landmine detection/identification systems.The system is based on a landmine CAD database, a database of the different sensor types and a constantly updated false alarm database that exchange information through layers constructed using Object Oriented programming techniques. The overall structure of the tool is based on the agent/object unit concept, which represents the participating entities and their interactions. The action sequences of the de-mining operations are formed with the same technique, giving to the system the characteristics of openness, versatility and reusability.     

基于构件技术的卫星地球站站控系统的设计模型

本文在分析已有卫星地球站站控系统模型优缺点的基础上，立足于站控系统的开放性、集成性和效率，运用基于构件的软件工程技术，提出一种层次清晰、接口规范、联系简洁、易于扩充的站控系统构件模型，并详细分析了模型中各构件的功能和构件间的通讯。该系统模型便于实现结构灵活、开放性强的实用系统。同时，构件也为易于实现软件
件复用。     

A Unified, Object-Oriented Graphics System and Software Architecture for Visualising CAD/CAM Presentations

Most object-oriented graphics systems (OOGS) either support general purpose graphics capabilities (drawing editors, ray tracing, etc.), or have targeted specific areas of computer graphics, for example, interface building, animation, and visualisation. However, the key concept in CAD/CAM graphics systems is that of presentations—pictures that convey information about products or parts of products. CAD/CAM graphics systems that create and manipulate presentations have specific graphical requirements that have not been addressed by existing OOGS. These requirements include the support of CAD/CAM concepts such as drawings, views and view-specific graphics, and layers, and the ability to allow external geometric modelers to be linked into the presentation. We describe an object-oriented presentation architecture that allows the application to describe the structure of the CAD/CAM presentation. This architecture provides a unified interface to drawings, views, layers and entities, and allows linkage to models created with an external geometric modeler, while isolating applications from details of the underlying traditional graphics rendering systems. It is our hope that this architecture provide the foundation for the architecture of next generation OOGS. We also present an implementation of this architecture and compare it to other OOGS.     

面向网格服务的标准件库系统集成

基于开放网格服务体系结构提出了面向服务的标准件库系统集成的体系结构．将标准件库系统中与数据库、CAD系统交互的功能组件封装在网格服务容器中，并与后台数据库一起部署成为网格服务节点，现有的标准件库系统只需提供服务的行为接口即可方便地集成到网格环境中．开发部署了一类标准件库网格服务节点，验证了该体系结构和实现技术的有效性．     

插装阀液压原因图CAD系统

本文在分析了插装阀液压系统特点的基础上，提出了一种基于通路拓扑的插装阀液压系统原理图设计模板，介绍了基于该设计模板的插装阀液压原理图CAD系统HGHSCAD的体系结构和工作流程，最后在总结分析的基础上得出了一些有益的结论。     

A CAD-CAE Integrated Injection Molding Design System

. In the injection molding design process, interaction between design and analysis is very intensive. This is to ensure that the plastic part being designed is manufacturable by the injection molding process. However, such interaction is not supported by current computer-aided systems (CAD and CAE), because design and analysis are realized as isolated modules. Although most of CAE systems provide built-in modeling tools, these are only meant for developing an analysis model with very limited CAD functionality. On the other hand, some CAD systems have allowed certain CAE systems to run under their environments, but inherently they use different data models, thus communication between them is poor. This paper presents an innovative, CAD-CAE integrated, injection molding design system. This system uses an integrated data model for both design and analysis. The system is built on top of existing CAD and CAE systems, which not only greatly saves development effort, but also makes full use of the strong functionality of commercial computer aided systems. The system architecture consists of four layers: a CAD and CAE platform layer; a CAD-CAE feature layer; a model layer; and a GUI layer. Two design cases were studied to illustrate the iterative design-analysis process and use of the developed system.     

Providing data base management for the CAD environment: The AREDAS approach

In recent years there has been an increasing interest in the integration of data base management systems (DBMSs) into the CAD environment. The motivation for this interest is discussed and several problems are identified that have to be solved in order to yield a genuine coupling of DBMSs and CAD systems. A solution to these problems is proposed in the form of a new architecture for a CAD-DBMS. Based on this, a preliminary implementation is outlined that follows a rapid prototype approach, and in wh ich an access as well as a transaction manager were realized for a software-based fileserver/workstation topology. Some directions for future work are described.