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.     

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.     

基于Delphi和VRML的虚拟装配平台的实现

针对目前 CAD软件只生成静态三维装配体 VRML 文件的问题 ,分析了交互式虚拟装配 VRML 文件的事件流程和虚拟产品的顺序装配的机理 ,提取其中可赋值变量 ,利用可视化编程语言 Delphi开发一个实现复杂虚拟装配的平台 ,完成静态 V RML文件到动态交互式虚拟装配文件的自动转换     

基于动车组转向架驱动系统的虚拟装配及有限元分析

借助于大型CAD/CAE软件I-DEAS建立CRH5动车组动力转向架驱动系统三维几何模型,然后利用基于VRML语言的CosmoWorlds软件对其进行虚拟装配仿真,在此基础上应用HyperMesh软件建立各部件的三维有限元模型,最后导入有限元计算软件Ansys中对整个系统进行模态分析。     

A web-based 3D virtual technologies for developing product information framework

Information technologies and the web are challenging, and changing theway industry works. It is believed that web-based 3D interface can be applied to strengthen the interactive visualization and manipulation of products. In this research, a web-based 3D virtual technologies for developing product information framework is applied in automotive electric system. It is very convenient to share with different partners (e.g., co-designers, manufacturers, customers, etc.) via the web for viewing the aesthetic functions, and verifying its related design functions. The overall procedures are listed: First, build CAD models of automotive electric system (including assemble parts and their components) through CAD system, then store them in a relational database. Second, transforming the CAD models users click into virtual reality modeling language (VRML) objects, it can be visualized graphically and animated interactively using a web browser with a VRML plug-in. Finally, operate the VRML objects by Java Language for the different purposes. Due to the technologies that are applied, many interactive modes are generated in cyberspace. Displaying the exploding process of 3D assemble part on the browser, assigning any component of assemble part through the mouse chick directly to display design details, e.g., dimensions, tolerances, datum planes, material, other references, etc. by retrieving the corresponding data from database, and building 2D projected views automatically follow the 3D viewpoint that users assign.     

Conceptual design system in a Web-based virtual interactive environment for product development

In this research, a Web-based conceptual design prototype system applied with open-source software (e.g., Java, PHP, etc.) is presented. Aside from the online conceptual design kernel interpreter module, it consists of four parts; a module to extract 3D component hierarchical configurations; a module to plan and view the assembly paths for 3D components; a module to set up the motion paths of components; and, finally, a module to handle the viewing direction of any component or assembly to show the 2D projected drawings in real time. In the first online module, it combines the chosen primitive features with Boolean operators. This module is programmed with the Java 3D module in order to build the CAD components on the platform of interactive design. Then, it infers the 3D configuration by analyzing the 3D modeling history. The configuration is described by a parent–child hierarchical relationship and the relative positions between two features. The positioning information is computed with respect to the VRML specification. The operation and control of the VRML objects is by the behavior modules of a Java applet, which plans the exploded/unexploded paths of the 3-D parts assembly and is specified interactively on the different components. Meanwhile, assigning the viewing direction to show the dynamic assembling process and generating projected drawings is automatically carried out by following the viewpoint assigned by the user. Finally, the system creates the motion file, in VRML format, for the assembly paths and behavioral simulation. This research offers a new virtual environment for collaborating design issues and discussion.     

基于虚拟现实的自动加工过程实验仿真系统的平台设计

迅速发展的互联网和虚拟现实技术使虚拟实验的实现成为可能。在集虚拟现实最新相关信息的基础上，这里提出基于虚拟现实的自动加工过程实验仿真系统的平台设计方案。以自动生产线为对象，文中主要阐述定制仿真实验体系构架的策略，包括：Java语言和VRML为宿主语言的选择；VRML编程与UG软件相结合的虚拟设备场景建摸方法；增强Web服务器动态交互功能的ASP、HTML、Java Applet混合应用;确保管理模块实现系统动态数据库访问和数据显示的Web服务器与数据库管理系统的组合。研制的原型系统表明，该方案所确定的策略是可行的，并能达到预期的效果。     

基于VRML-Java3D的交互式装配可视化环境构建

为了实现基于网络的可视化虚拟装配环境,笔者研究了Java3D与VRML相结合的方法。通过Loader接口将VRML造型文件导入到Java3D场景图中,借助Java语言的事件处理模型,并结合Java3D中的Interpolator内插器对象和Alpha对象,实现交互式添加、拆卸、移动和旋转等装配过程。最后以电机中的转子装配为例,给出了一个基于VRML-Java3D的交互式装配可视化环境。     

基于Web的自行车三维虚拟实时定制设计

通过集成VRML、Java等开放的标准和技术,实现了基于Web和非沉浸式虚拟现实（VR）的自行车虚拟实时三维定制系统,克服了基于文本和二维图形的定制系统中设计结果不能实时逼真显示的缺点。对三维自行车模型进行了优化,以适应远程传输和实时渲染的要求．以零部件为基本单元实现了自行车造型及外观的改变,普通客户可直接参与自行车的个性化实时定制设计,有助于生产企业及时有效地获得用户真实全面的需求信息,增加产品的用户满意度.     

基于Windows Mobile的机械制图虚拟模型

对基于Windows Mobile平台的机械制图虚拟模型进行了研究,通过分析基于Windows Mobile的虚拟模型开发平台以及Windows Mobile中的3D图形绘制技术,确定了Mesh类的数据需求;研究了VRML标准IndexFaceSet节点的数据结构,获得了VRML文件解析的逻辑关系;设计实现了基于Direct3DMobile的VRML模型3D浏览器,并实现了基于Windows Mobile平台的机械制图虚拟模型系统设计。该系统拓展了虚拟模型库的应用空间,为其他虚拟模型的移动应用提供了基础。     

基于VRML的产品虚拟设计技术探讨

虚拟现实技术是20世纪末兴起的一门崭新的综合性信息技术.本文讨论了基于VRML的机械产品虚拟设计技术;探讨了虚拟环境下的人机交互方式,并研究了建立机械产品的虚拟原型系统的方法,结合数据库和Web技术,构建了基于VRML与Java的变电柜虚拟原型系统,实现了虚拟环境下的人机交互.     

Internet环境下面向中小型制造企业的三维虚拟设计方法

在分析虚拟现实系统的基础上,针对现有的Internet网络环境和我国中小型制造企业的实际情况,研究采用VRML和Java构建非沉浸式虚拟设计环境的实施方案,讨论基于虚拟原型的产品开发技术。以减速箱为研究对象构建的三维虚拟设计系统,验证这一方法表明,其是经济、实用的可行方法。     

米糠挤压设备的虚拟设计

对虚拟现实技术作了分析阐述，研究开发了米糠挤压设备的关键结构，并用三维辅助设计软件建立了实体模型，基于Intemet虚拟现实技术，研究开发了米糠挤压设备的虚拟样机。     

基于三维数字技术实现对场馆、景点的虚拟漫游

以3DS MAX和VRML软件为工具,为某展览馆设计了虚拟漫游导游系统,探讨了对虚拟场景中不同景观的不同建模方法和基于VRML软件的漫游系统的功能实现.     

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。     

基于并行工程的汽车部件CAD系统

主要研究了并行设计在汽车部件ＣＡＤ系统开发方面的应用。将所要设计的汽车部件在计算机上模拟为一个三维的完全数字化的实体模型,使设计、分析计算、装车检验、工业造型作为一个并行的工程来研究;利用人机工程、动态仿真、虚拟装配等关键技术,克服了传统的设计方法设计周期长、成本高、产品质量低等方面的弊端,使汽车部件的设计符合现代化设计的潮流。     

基于虚拟现实技术CAD系统的研究

在CAD系统中引入虚拟现实技术进行设计是当前CAD系统的发展趋势之一，可以为设计人员提供自然、逼真、多感知的设计环境，从而大大提高设计的效率和质量。在介绍传统CAD系统的基础上，分析了其存在的局限，重点介绍了虚拟现实技术的有关概念，基于虚拟现实技术CAD系统的提出、特点以及目前的研究应用现状。     

VRML在六自由度并联机器人设计中的应用

六自由度并联机器人的设计过程十分复杂，VRML作为一种通用的虚拟现实建模语言，为各个设计过程之间架起了一座沟通的桥梁，从而加快了系统的整体开发过程。提出了利用VRML在廉价的PC机上构建六自由度并联机器人三维虚拟世界的方法，并给出了与其它编程语言之间的接口实现方法。     

WEB-BASED VIRTUAL CNC MACHINE MODELING AND OPERATION

A CNC simulation system based on internet for operation training of manufacturing facility and manufacturing process simulation is proposed. Firstly, the system framework and a rapid modeling method of CNC machine tool are studied under the virtual environment based on PolyTrans and CAD software. Then, a new method is proposed to enhance and expand the interactive ability of virtual reality modeling language(VRML) by attaining communication among VRML, JavaApplet, JavaScript and Html so as to realize the virtual operation for CNC machine tool. Moreover, the algorithm of material removed simulation based on VRML Z-map is presented. The advantages of this algorithm include less memory requirement and much higher computation. Lastly, the CNC milling machine is taken as an illustrative example for the prototype development in order to validate the feasibility of the proposed approach.     

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.