分布式实时控制系统的网络调度研究

Network Scheduling of Distributed Real-Time Control System

基于实时网络分布式控制系统的性能不仅取决于控制算法,而且取决于网络信息调度的特点,以具有确定时间性与可靠性的TDMA(时分多路访问)网络作为控制网络,对网络中的控制信息进行调度.建立了分布控制系统的任务调度模型,并采用遗传算法求解网络调度问题,以提高控制系统性能和网络利用率,寻求最优的通信时序.仿真结果表明,经过优化调度后,控制回路的任务周期最短;与常规非优化状态下的系统性能相比,控制系统的总体性能指标减小,网络利用率提高.

Based on the fact that the performance of distributed real-time control systems closed through control network depends on not only control algorithms but also network scheduling, time division multiple access （TDMA） with determinate timing and reliability was used as control network to describe the control messages through network. A scheduling model for distributed real-time control systems based on TDMA control network was established. Based on this model, a genetic algorithmbased scheduling algorithm was proposed to improve the control performance and network utihzation ratio. A scheduling example shows that compared with the normal condition, the period of optimized control tasks is minimized and the control performance and the network utilization ratio are improved.