基于自适应灰色预测的虚速率算法

虚速率(VRC)算法是近年来新兴的一种基于速率的主动队列管理算法,本文将灰色预测、自适应控制与虚速率算法三者的设计思想融合起来,提出一种新的基于自适应灰色预测的虚速率算法。将二次型性能指标引入到VRC算法中PID控制器的整定过程中,按照性能指标的负梯度方向修改加权系数,实现了PID的自适应最优控制。同时将自适应PID与灰色预测器相结合,用预测结果代替被控对象测量值,克服了网络时滞和干扰给系统带来的负面影响,并进行了稳定性分析。仿真结果表明,该算法具有优良的性能。

Virtual Rate Control Algorithm Based on Adaptive Grey Prediction

Virtual rate control(VRC)algorithm is a new active queue management(AQM)arithmetic based on rate.A new VRC algorithm based on the grey prediction and the adaptive PID control was proposed.The quadratic performance index was introduced in order to realize the adaptive optimal control of PID controller.Weight coefficient was modified with anti-gradient direction of the performance index.The adaptive PID controller was combined with grey prediction controller. The measured value was substituted for forecast value.The negative effect brought by the time delay and interference of the network was minimized.The stability of the system was analyzed.The simulation results show the network system using this algorithm has excellent performances.