基于EDA的网络化控制系统抖动优化调度算法

Optimal scheduling algorithm for reducing jitter in networked control systems based on estimation of distribution algorithms

研究了具有传输抖动的令牌型网络化控制系统的优化调度问题.根据令牌型网络化控制系统的特点及有抖动可行调度问题的特性,在有效扩大搜索可行解域的基础上,提出基于分布估计算法的网络化控制系统抖动优化调度算法.在满足控制系统动态性能和网络可调度性条件下,建立基于分布估计算法的优化模型,通过优化选取各控制闭环的采样周期和初相,在兼顾周期抖动对控制闭环动态性能影响的同时合理地分配带宽资源.仿真结果表明所提算法可有效降低系统传输抖动,改善令牌型网络化控制系统的调度性能.

The optimal bandwidth scheduling problem for token-type networked control systems（NCSs） with delay and jitter is investigated.According to the characteristics of the token-type NCSs and the property of feasible scheduling problem w ith jitter,the feasible solution domain is expanded and the estimation of distribution algorithm（EDA） is introduced to build an EDA-based optimization model.Under this framew ork,the optimal sampling period and the optimal initial phase are selected for each control loop under both constraints of control performance and netw ork schedulability such that the bandw idth resource is allocated properly and utilized efficiently.Simulation results are given to illustrate the effectiveness of the proposed method.