虚拟现实技术与汽车造型设计

介绍了虚拟现实设计的内涵及其系统的组成,分析了虚拟现实设计与和传统CAD的关系,阐述了虚拟现实技术在汽车造型中的具体应用.     

虚拟装配工艺设计技术研究与应用

阐述虚拟装配工艺设计技术内涵及其体系结构,深入分析其所涉及的CAD系统与虚拟现实系统间的数据转换、碰撞检测技术、装配规划与仿真以及装配运动导航与准确定位等关键技术,并应用该技术,以商品化CAD系统Pro/E为建模工具,在VC与WTK平台及ORACLE数据库的支持下开发了一个虚拟装配工艺设计原型系统HIT-VAPD,实现了虚拟现实环境下的产品装配工艺规划与设计.实际应用表明,该系统可显著提高装配工艺设计效率,减少设计缺陷.     

虚拟概念设计系统--概念设计方法的变革

分析了传统概念设计和现行CAD系统交互方式的局限。介绍了具有新的人机界面的虚拟现实技术在概念设计中的应用——虚拟概念设计系统及其主要功能。     

基于SolidWorks-VRML实现工业机器人在虚拟环境中建模

虚拟设计是CAD研究的重要内容.本文介绍了虚拟现实技术(VR)和虚拟现实建模语言(VRML),并结合工业机器人虚拟现实模型开发的实际,探讨了基于SolidWorks-VRML 建立三维产品虚拟模型的建模方法和原理,最后给出了虚拟工业机器人模型实例.     

VR_Platform在开发虚拟机床夹具装配展示系统中的应用

研究了在构建夹具三维标准零件、部件图库基础上,机床夹具三维计算机辅助设计的方法。并在CAD技术和3ds max建模软件、VR_Platform虚拟现实软件的基础上,构建了虚拟机床夹具装配展示系统。实践了虚拟现实技术在机械装配展示系统中的应用。     

交互式自适应模型简化与转换技术研究

获得CAE、虚拟现实系统下的数字模型的最主要方式是对CAD模型进行简化和转换，本文提出的交互式自适应模型简化与转换技术解决了从CAD模型到CAE、VR模型的自动简化与转换过程，详细阐述了该方法涉及到的一些主要技术，包括CAD模型自动简化技术、模型转换技术、面片聚类技术、面片简化技术等。     

微机电系统CAD的研究分析

概述了微机电系统CAD的研究进展，重点介绍了国外在该领域的研究工作。针对其与传统机电系统的不同。总结了微机电系统CAD的技术特点，并据此提出了微机电系统的设计原则，还介绍了微机电系统CAD的系统模型、常用的软件设计方法以及目前存在的几个问题。     

三维CAD技术及其系统开发

介绍了三维CAD技术的意义与作用，三维CAD技术的发展历程及发展趋势，并对三维CAD系统的设计与开发作了简要的分析。     

CAD在制定综合计划中的应用

介绍了CAD技术在制定企业综合计划过程中的应用，并以制定生产计划这一典型过程为例，介绍了制定综合计划的CAD系统的设计与实施。     

基于知识的塑钢门窗CAD系统开发

介绍了塑钢门窗CAD系统的总体设计架构,结合成熟的塑料异型材截面设计专家经验,建立了用于规范型材截面设计的知识库,并在该知识库的基础上,利用虚拟现实技术,通过AutoCAD二次开发,快速创建塑钢门窗虚拟仿真模型,并能以人机交互的方式,实时获取塑钢门窗的开关运动效果,为技术人员优化和改进塑钢门窗的设计提供了有效的帮助.     

基于虚拟现实技术的原型设计机理研究

把虚拟现实技术与ＣＡＤ设计环境结合起来,通过将人引入概念设计回路,提出了基于约束的面向对象建模方法,形成了基于虚拟现实技术的原型设计系统ＶＲＰＳ,并探讨了系统的组成和实施机理。比较真实地反映了人在产品设计行为中的思维过程,从而克服了传统ＣＡＤ系统的多种缺陷。     

Live parametric design modifications in CAD-linked virtual environment

This paper presents a solution to support parametric design modification in a virtual reality (VR) environment. It builds upon a novel computer-aided design (CAD) and VR integration framework, namely, CAD-linked virtual reality environment. With this framework, semantic information in CAD models, such as constraints, design features, and parametric settings can be automatically extracted during the creation of VR environment and be integrated into the virtual assembly (VA) models. Moreover, the persistent naming mechanism originating from feature-based modeling technology is introduced into the CAD–VR integration, based on which a persistent linkage between VA models and their CAD counterparts can be established. Users are able to visualize design features and to access the associated parametric info in VR environment and also to change the parametric settings online whenever necessary. The modified parametric settings are then sent back to the linked CAD models so that parts can be re-evaluated. The modified CAD part can then be reloaded into the VA model under an automated mechanism. Such communications between CAD and VR applications are supported in a live mode utilizing the COM interfaces provided by CAD server. With this solution, a quick return loop from VR to CAD is achieved. Therefore, it provides the possibility to support quick design change review and “what-if” evaluations for applications such as collaborative system design and immersive project review in VR. This constitutes the major contribution of the work to product development process.     

A virtual injection molding system based on numerical simulation

CAD and CAE have now become very popular in injection molding development. Integration with virtual reality is a new boost to these fields. This paper presents a research effort targeting the creation of a desktop-based, low-cost and independent virtual injection molding system, which is implemented based on the techniques such as virtual reality, finite element analysis, motion simulation and scientific visualization. With the stereoscopic display of the mold design and motion, the system provides engineers a cohesive view of mold structure and assembly. And by analyzing the numerical CAE results, the possible faults during molding process can also be highlighted. With this integration, the overall system would be a new powerful tool to mimic the real process of injection molding and evaluate various influences from product design to manufacturing, capable, therefore, of improving the moldability and the quality of molded products.     

VIRTUAL DESIGN OF A NEW TYPE OF HYDRAULIC SUPPORT

Using virtual reality to design a new type of hydraulic support is discussed. That is how to make use of the virtual design to develop coal mining machine in practice. The advantages of virtual design are studied and the simple virtual reality system is built. The 3D parts and elements of hydraulic support are modeled with parametric design in CAD software, then exported to VR environment, in which the virtual hydraulic support is assembled, operated and tested. With the method, the errors and faults of design can be fined easily, many improvements are made and the new hydraulic support is developed successfully.     

基于人机工程的虚拟产品设计

人性化产品设计中引入虚拟现实技术是未来产品设计的趋势之一。这里在简单介绍人虚拟现实技术的基础上，探讨了基于人机工程的虚拟产品设计模式和虚拟环境中的人机分析与评价系统（以鼠标设计为例）。     

A solution to integrate computer-aided design (CAD) and virtual reality (VR) databases in design and manufacturing processes

The use of virtual reality (VR) techniques in industry is subject to very high expectations, as VR has emerged as a popular technology for computer-human interfaces in order to master the shortcomings of CAD systems. 3D CAD models provide a natural way of sharing design information among participants in the production process. VRML is a tool specifically designed for creating 3D virtual worlds on the Web, where these synthetic worlds can give us the ability to visualise objects and navigate the virtual world. This paper describes a system for VRML model visualisation that enables changes in the configuration file, which is written in XML, and that automatically reviews the model including the functional behaviour. From the evaluated VRML model, the connection to a PDM system is provided with a list of elements and their material properties.     

产品装配分析环境的构建

采用Visual C 编程语言，在现有CAD系统的基础上，以Object ARX为开发工具，建立了产品装配分析系统基本结构，可直观演示人机交互拆、装过程，分析装配几何体设计中的缺陷，提取相关装配特征信息，进行装配顺序分析和工艺规划。在Open Inventor虚拟现实软件开发包的基础上，开发了虚拟装配环境，构建了虚拟装配系统的结构框架，实现了从CAD环境到虚拟装配环境产品几何模型数据的传递，演示了产品在虚拟环境下的拆卸过程。     

基于Pro/E的虚拟设计与制造环境的研究与开发

虚拟制造技术是多个学科领域知识的综合集成与应用，计算机仿真，建模和优化技术是虚拟制造的核心与关键技术。依据虚拟制造的思想，结合成熟的CAD/CAM产品和虚拟现实技术，构建了一个集成的虚拟设计与制造环境，讨论了各模块的功能以及系统开发的关键技术和开发环境。创建了原型系统，对虚拟制造技术的应用进行了初步探索。