多用户协同虚拟装配网格系统研究

针对复杂产品协同虚拟装配仿真应用中存在的协同交互能力差、计算资源短缺、资源动态调度分配难、规模易受限制等问题,提出了一种借鉴网格体系结构的多用户协同虚拟装配网格平台方案,介绍了系统中仿真计算资源的类型及功能,进而提出了面向服务的仿真计算资源服务化封装方法,同时还给出了系统资源管理、任务管理与调度等部分关键技术的解决方案.最后将原型系统用于某汽车多用户异地协同装配仿真验证了该系统的有效性.     

复杂产品虚拟样机协同开发平台设计与实现

提出复杂产品虚拟样机协同开发平台的体系结构和功能框架,设计统一数据访问接口,自主开发了“复杂产品虚拟样机协同开发平台”软件。该软件包括个人工作空间管理、仿真建模、数据管理、过程管理、模型库管理和仿真评估等功能模块,能够支持复杂产品从设计、仿真、分析和优化的整个多学科协同开发过程,实现了对协同开发相关的项目、人员、模型、数据和工作流等资源的集成化管理,为复杂产品虚拟样机的实施提供了设计、仿真和资源管理的分布式支撑环境。     

基于虚拟样机的复杂产品协同设计与仿真关键技术研究

主要研究并行工程环境下复杂产品虚拟样机协同设计与仿真的体系结构及其关键技术。提出虚拟样机协同设计与仿真系统的体系结构与整体解决方案,研究面向虚拟样机的数字化多领域集成建模理论与方法,建立面向虚拟样机开发全生命周期的集成过程管理与冲突协调模型,提出面向复杂产品虚拟样机开发的多学科协同设计、协同仿真和智能决策支持的理论与方法,建立复杂产品虚拟样机协同支持环境,有效提高企业创新能力和核心竞争力。     

基于虚拟样机的复杂产品协同设计与仿真关键技术研究*

主要研究并行工程环境下复杂产品虚拟样机协同设计与仿真的体系结构及其关键技术。提出虚拟样机协同设计与仿真系统的体系结构与整体解决方案,研究面向虚拟样机的数字化多领域集成建模理论与方法,建立面向虚拟样机开发全生命周期的集成过程管理与冲突协调模型,提出面向复杂产品虚拟样机开发的多学科协同设计、协同仿真和智能决策支持的理论与方法,建立复杂产品虚拟样机协同支持环境,有效提高企业创新能力和核心竞争力。     

分布式虚拟装配训练通用平台研究

针对当前部队训练中存在大量协同装配训练的问题,对基于系统通用性的分布式虚拟装配训练通用平台进行研究,提出了平台的功能模块和体系结构,研究了层次化装配体模型构建、基于运动副自由度规约的运动仿真、分布式虚拟训练以及碰撞检测等关键技术,开发并实现了分布式虚拟装配训练通用平台;实验结果表明,该平台能够满足协同装配的训练需求,且具有很好的通用性。     

基于Web的分布式协同工作环境的研究与实现

针对分布式协同工作环境的分布式、跨平台、瘦客户端、可扩展和多终端实时同步的要求,提出了一个基于J2EE平台的分布式协同工作环境解决方案,采用JMS消息机制,支持分布式部署,适应大型协同工作的要求。该方案适用于大型复杂产品协同设计环境的研究和开发。     

基于虚拟样机的协同设计技术

基于虚拟样机的协同设计技术是将协同设计技术应用到虚拟样机的开发过程中 ,可以大大简化机械产品的设计开发过程 ,大幅度缩短产品开发周期和降低开发费用 ,提高产品的系统级性能 ,获得最优化和创新的设计产品。针对虚拟样机技术的特点及其与协同设计的关系 ,提出虚拟样机协同设计的方法 ,并对虚拟样机协同设计环境基本结构及实现方案进行了介绍     

Internet驱动的产品协同装配理论和技术研究

介绍了Internet驱动的分布式产品协同装配中的关键技术问题,协同装配设计平台的构建、产品模型呈现方法、冲突处理、协同装配信息建模和协同装配设计优化,并分析总结了目前存在的问题。最后构建了一个全面的产品协同装配系统框架。     

机车车辆虚拟样机调度平台设计与开发*

简要介绍了机车车辆虚拟样机的发展现状,针对机车车辆虚拟样机系统协同设计的需求,提出了机车车辆虚拟样机调度平台,基于研究现状对该平台进行了功能的完善.按照协同的观点规范了机车车辆虚拟样机各部分的任务,并采用数据管理、子系统调控、文件管理、工作流管理、系统安全等技术,研究了基于产品数据管理的机车车辆虚拟样机调度平台的关键技术,开发了分布式网络工作环境下协同的机车车辆虚拟样机调度平台.通过初步试运行,表明该平台能有效地支持分布式网络工作环境下机车车辆虚拟样机的协同开发.     

基于Agent的协同设计系统ABCD的研究与实现

提出了一种基于Agent的产品协同设计系统ABCD(Agent-BasedCooperativeDesign),分析了系统的体系结构并描述产品协同设计的过程。系统采用Java作为软总线,通过对一个复杂的机械产品设计实例,研究了协同设计的问题,给出了一种可行的解决方案,有效地解决了异构环境下产品分布式协同开发。     

基于上下文的分布式协同过滤推荐技术

针对传统协同过滤推荐技术应用于大规模动态数据集时难以兼顾准确度和效率的问题,提出一种基于上下文的分布式协同过滤推荐技术,引入推荐上下文的概念,并在此基础上充分考虑用户的即时兴趣以提高推荐的准确度,采用评分矩阵的分布式存储和计算以提高推荐的效率。实验结果表明,该分布式协同过滤技术能同时保证推荐的准确度和效率,使其在大规模动态数据集上的应用更具优势。     

Hybrid client-server architecture and control techniques for collaborative product development using haptic interfaces

In this paper, a collaborative product development and prototyping framework is proposed by using distributed haptic interfaces along with deformable objects modeling. Collaborative Virtual Environment (CVE) is a promising technique for industrial product development and virtual prototyping. Network control problems such as network traffic and network delay in communication have greatly limited collaborative virtual environment applications. The problems become more difficult when high-update-rate haptic interfaces and computation intensive deformable objects modeling are integrated into CVEs for intuitive manipulation and enhanced realism. A hybrid network architecture is proposed to balance the computational burden of haptic rendering and deformable object simulation. Adaptive artificial time compensation is used to reduce the time discrepancy between the server and the client. Interpolation and extrapolation approaches are used to synchronize graphic and haptic data transmitted over the network. The proposed techniques can be used for collaborative product development, virtual assembly, remote product simulation and other collaborative virtual environments where both haptic interfaces and deformable object models are involved.     

地图协同标绘感知系统的设计与实现

传统标绘系统都是单用户标绘，它不能满足多用户同时进行标绘的要求。文中设计构建了一个CSCW标绘系统，以解决远程多用户同时进行协同标绘行为的难题，并提出主席一用户模式体系结构，以协同标绘层和协同管理层为核心的系统框架以及分布式加锁策略等技术来解决协同管理、实时交互和协同感知，以此实现异地协同标绘系统。     

复杂产品虚拟样机支撑平台的初步研究与开发

该文主要研究并介绍了复杂产品虚拟样机支撑平台研究项目取得的阶段研究成果，包括支撑平台体系结构及其关键技术等，尤其重点介绍了目前自行开发集成的，开放的，基于标准支持多领域复杂产品虚拟样机工程的支撑平台，并给了两个基于支撑平台的典型虚拟样机开发应用案例。初步实践表明复杂产品虚拟样机支撑平台可看作为下一代企业协同应用各领域CAx/DFx工具的有效手段。最后，对进一步研究工作进行了展望。     

A CAE-integrated distributed collaborative design system for finite element analysis of complex product based on SOOA

Large-scale finite element analysis of complex product needs a wider support from external CAE resources. This paper proposes a method of the distributed concurrent and collaborative design in the distributed intelligent resources environment to use Web-based extended manufacturing resources for product development. The CAE-integrated distributed collaborative design system architecture and enabling techniques are presented. Distributed CAE service resources on the Internet are achieved through Jini^TM and service object-oriented architecture technologies. These CAE software tool resources are encapsulated as service providers in the system. A case study of railway bogie development is presented, and the Pro/E, HyperMesh, Ansys and HumanExpert service providers dynamically invoked and integrated as a temporary service federated environment with no need to know the exact location of a provider beforehand, flexibility can be well achieved, and collaborative design in the system can be implemented in the distributed dynamic environment. Compared with the traditional design system, some preliminary results indicate this architecture can shorten the cycle of service exchange, and strongly support concurrent and collaborative design of the complex product.     

Multi-User Collaborative Assembly Planning over the Internet

1 Introduction Assembly planning is an important issue of product design for assembly, and many achievements have been obtained. Techniques such as geometric reasoning [1,2], genetic algorithms (GA) [3], virtual assembly [4,5] and so on are employed to assembly planning of relatively simple products successfully. But for the more complex cases, there is a combinational complexity problem when the geometric reasoning method is used. The fitness function in GA cannot take into account various…     

Multi-User Collaborative Assembly Planning over the Internet

Due to the increasing complexity of products and for the distributed product development, more closely collaborative work among designers is required. A collaborative assembly planning approach is proposed to support assembly planning in a networked environment. The working procedure is depicted and the key techniques including collaborative-planning-oriented assembly decomposition modeling, assembly assignment modeling, and sub-plans merging are addressed. By incorporating visual models at client side with assembly application models at server side, a web-based supporting environment for collaborative assembly planning has been developed using VRML and Java-EAI techniques. A case study is given to illustrate the feasibility and validity of the idea.     

复杂产品虚拟样机技术研究

虚拟样机技术尤其是面向多领域支持复杂系统的协同虚拟样机仿真支撑平台的研究已成为研发的热点。通过对Agent技术和WEB服务技术以及虚拟样机仿真系统的长期研究,提出了一种面向多领域的复杂产品虚拟样机仿真支撑平台的实现方案,给出了该仿真支撑平台的基于Agent和WEB服务的系统结构和虚拟样机设计中涉及的机械,电子,控制,软件等领域的智能Agent的统一描述,讨论了虚拟样机仿真支撑系统中Agent间的通信方式并阐明了系统的工作流程和信息集成模式,为虚拟样机的进一步发展和应用奠定了基础。     

A framework for collaborative top-down assembly design

This paper presents a new system framework for collaborative top-down assembly design. Different from current computer-aided design (CAD) systems, the framework allows a group of designers to collaboratively conduct product design in a top-down manner. In our framework, a multi-level and distributed assembly model is adopted to effectively support collaborative top-down assembly design. Meanwhile, fine-granularity collaborative design functionalities are provided. First, the coupled structural parameters involved in the distributed skeleton models of the product can be collaboratively determined by the correlative designers based on fuzzy and utility theory. Second, agent based design variation propagation is achieved to ensure the consistency of the multi-level and distributed assembly model during the whole design process. Third, collaborative design of assembly interfaces between the components assigned to different designers is supported. The prototype implementation shows that our framework works well for supporting practical collaborative top-down assembly design.     

A self-configurable large-scale virtual manufacturing environment for collaborative designers

As manufacturing environments are getting distributed and increasing in size, the related virtual environments are getting larger and more closely networked together. This trend has led to a new paradigm—large-scale virtual manufacturing environment (LSVME). It supports networked and distributed virtual manufacturing to meet manufacturing system requirements. Since it contains a large number of virtual components, an effective data structure and collaborative construction methodology are needed. A metaearth architecture is proposed as the data structure for representing LSVME. This architecture consists of virtual space layer, mapping layer, library layer and ontology layers, which describe interaction among virtual components and has the ability to analyze the characteristics of virtual environment. In addition, it increases reusability of virtual components and supports self-reconfiguration for manufacturing simulation. A heuristic construction method based on graph theory is proposed using this architecture. It prevents redundant design of virtual components and contributes to an effective construction scheduling technique for collaborative designers.