摘要： 虚拟现实技术发展很快，有广泛的工业和商业应用。网络虚拟现实技术已越来越为工业制造业所关注，虚拟制造环境(VME)的一个主要用途是在线可视化和对3D信息的协作控制，这需要实时数据传输的支持。为了满足基于Internet的VE通信需求，特别是为满足虚拟制造和协作设计和控制，该文设计并实现了一个支持网络虚拟设计和制造的网络虚拟现实系统，此系统用MMS协议实现VE通信，并将工业控制服务集成于基于Internet的虚拟环境中。

关键词: 虚拟现实, 网络虚拟环境, 虚拟制造设备, MMS协议

Abstract: Virtual reality (VR) is a rapidly developing technology that has wide spectrum industrial and commercial applications. Networked virtual environments (VEs) are of growing interests to modern manufacturing industry; a dominating use of networked virtual manufacturing environments (VMEs) is on-line visualisation and collaborative control of 3D information. This has to be supported by real-time data transfer. To meet a broad range of common requirements for Internet-based VE communications, particularly for virtual manufacturing and collaborative design and control, this paper presents a networked virtual environment system that is designed to support networked virtual design and manufacturing. The system is implemented with the manufacturing message specification (MMS) standards so as to achieve a range of integrated manufacturing services into networked VEs over the Internet.

Key words: Virtual reality(VR), Networked virtual environment, Virtual manufacturing device (VMD), Manufacturing message specification (MMS)