基于计算机协同工作的高层体系结构组播扩展

High-level Architecture Multicast Extension Based on Computer Cooperative Work

采用虚拟现实技术的联合培训仿真需要成员能沉浸于统一的协同仿真环境中,在运动逼真度上传统的插值技术不如成员实时上传技术,这就需要高层体系架构和运行支撑(HLA/RTI)在保证仿真时空一致性的基础上保证网络通信的实时性。通过对比RTI的几种实时技术,选用CSCW(computer supported cooperative work)的终端组播技术来修改和扩充HLA的实现架构。在仿真初始化阶段,利用HLA的声明和对象管理服务接口来建立和管理CSCW的网络拓扑,并利用HLA的数据过滤机制为每个联邦成员建立相应的M esh树;在仿真运行阶段,为RTI添加一个新线程并将CSCW的实时组播交互技术融入到RTI中,使RTI还能利用窗口消息机制来通知应用更新显示画面。通过在大电网运行下变电站沉浸式仿真培训中的多个应用,表明针对RTI的终端组播扩展技术取得了满意的培训效果。

The joint training simulation using the virtual reality technology requires members to immerse themselves in a unified simulation environment.The traditional interpolation technology in the motion fidelity is inferior to the real-time upload technology of members,which requires HLA/RTI to realize real-time network communication on the basis of ensuring the simulation of time and spatial consistency.By comparing the several real-time technologies of RTI,we use the CSCW＇s（ computer supported cooperative work） terminal multicast technology to modify and expand the implementation framework of HLA. During the simulation initialization,we use the HLA statement and object management service interface to establish and manage the CSCW network topology and the HLA data filtering mechanism for each federal member to establish the corresponding Mesh tree.During the simulation running,we add a newthread for the RTI and the CSCW real-time multicast interactive technology into the RTI,so that the RTI can also use the windowmessage mechanism to notify the application update the display screen.Through many applications of submerged simulation training in substation under the operation of large power grid,it is shown that it has achieved satisfactory training effect with RTI＇s terminal multicast expansion technology.