工程CAD产品远程设计的类实时交互技术  

Nominal Real-time Cooperation of Distant Product Design in Engineering CAD

作　　者：储备[1] 杨海波 蔡青[1] 

机构地区：[1]西北工业大学CAD/CAM研究中心,西安710072 [2]西安市市政设计研究院,西安710068

出　　处：《计算机学报》2002年第1期36-43,共8页Chinese Journal of Computers

摘　　要：在 Internet网上由于网络带宽限制等多方面的原因 ,远程产品协同设计实时交互是无法达到的 .为此 ,基于现有的软硬件环境及实际需要 ,该文提出了一个以集中模式与分布模式混合构造的“类实时交互”模型 ,使 CAD系统的交互层次上升到操作语义信息 .同时文中首次提出了 CAD操作命令交换标准 STEC,并以 CORBA中 IDL语言定义了工程 CAD系统与 STEC之间的映射 .实践表明 ,该模型便于跨平台工作 。With the current conditions of software and hardware and demand for practice, a model of Nominal Real Time Interaction(NRTI) constructed with concentration and distribution patterns is presented. The basic idea of NRTI is to encapsulate additional operation information of CAD system to achieve real time interaction of the design objects and process by the event-driven synchronization and timing sequence synchronization, which makes the interaction level in CAD systems up to that of semanteme for operation information. Moreover, NRTI includes two levels: AutoCAD based NRTI and information interaction standard based NRTI, and two patterns: the concentrative NRTI and the distributed NRTI. The concentration pattern of NRTI is often used to initialize the CAD system environment, while the distribution pattern is used to transmit and operate the CAD data. In addition, the Standard for the Exchange of Command in computer aided design (STEC) is also presented for the first time, including its object, conforming principles, meta-sentence, command and functional extension language SLISP. Finally the mutual mapping of engineering CAD and STEC by IDL of CORBA is defined, it provides the feature of standard and practicability in STEC. By analyzing the experiments, the model of NRTI can easily work in different platforms, and improves intercommunication and real time cooperation of effective information in distant product design.

关 键 词：远程产品设计 工程设计 类实时交互技术 CAD CSCW 

分 类 号：TB21[一般工业技术—工程设计测绘] TP391.72[自动化与计算机技术—计算机应用技术]