基于Levinson-Durbin算法的变采样周期调度

Variable Sampling Period Scheduling of NCS Based on Levinson-Durbin Algorithm

由于资源受限而产生的网络时延是多回路网络控制系统面临的最严重问题之一,该时延具有随机、时变的特性,它将导致控制效果不理想,甚至使得系统不稳定。针对该问题,本文提出了基于中间插件的变采样周期调度策略,通过动态调整各控制回路的采样周期来实现网络资源的动态分配,以有效地减小网络时延,保证系统的稳定性。仿真结果表明,将该策略应用到资源受限的网络控制系统中,可以较大程度地减小随机时变时延对控制性能产生的负面影响,使得控制系统工作稳定,并有效地提高网络控制系统整体的控制性能。

The biggest problem that Muhi-loop networked control systems face is the random time-varying delay, which often causes system instability and even collapse. Aim this problem, a variable sampling period schedule scheme based on middle plug is present- ed in this paper. Effectively reduce the network-induced delay and ensure the real-time of the system by dynamically adjusting the sampling periods of the control loops. Simulation results show that, compared to the fixed sampling periods＇ system, this strategy can greatly reduce the negative impaction of network delay in control performance. The scheme can make the control system work stably and effectively improve the overall control performance.