The primary works and innovations of this paper include but not limited to : ( 1 ) considering the nonlinear , time - varying and uncertain characteristics of networks , a new active queue management ( aqm ) algorithm , i . e . nnpc - aqm was proposed based on predictive control theory , which requires less model accuracy . in order to realize fast control , a predictor was constructed using two - layer linear neural network to predict the future queue length , and a controller was composed using two layers of nonlinear neural network to optimize the next control volume , i . e . drop probability 本文研究的主要内容及创新点如下: ( 1 )针对网络的非线性、时滞、不确定特点,结合预测控制理论提出一种新型主动队列管理( aqm )策略nnpc - aqm ,该算法基于单值预测控制思想,为了实现快速控制,采用两层神经网络构造预测器,估计未来时刻队列长度;采用两层非线性神经网络组成控制器,实现对下一步丢弃概率的优化。
A simplified set of equations for analysis of the filling . finite difference methods are used for the pressure calculation . advancement of flow f ront uses a control volume approachand dynamic simulation of the moldfilling process is achieved . other is wetting out process which is the most critical stage in rtm . this stage is a typical porous media flow problem 从粘性流体力学的质量和动量方程出发,建立了描述充模流动过程的数学模型,利用有限差分法求解压力方程,并利用控制体积法跟踪流体前沿;第二部分是充模流动的主体部分,属于典型的多孔介质的流动问题。
Ebu - arrehenius and second - moment turbulent combustion model are used to determine the reaction rate . to consider the influence of heat radiation on the gas temperature and wall temperature , the six flux model is applied to predictions of heat flux distributions . the discretization of governing equations on a non - staggered grid system is performed by hybrid scheme over the control volume , and discretization equations are solved with simple algorithm 利用椭圆型微分方程法和区域法生成三维贴体网格,文中数学模型有紊流模型、紊流燃烧模型和辐射模型,采用k -双方程模型来预估紊流特性, ebu - arrehenius和二阶矩紊流燃烧模型来估算化学反应速率,六通量辐射模型预估辐射通量,以便考虑热辐射对壁温和气流温度的影响。
In fluid mechanics and thermodynamics, a control volume is a mathematical abstraction employed in the process of creating mathematical models of physical processes. In an inertial frame of reference, it is a volume fixed in space or moving with constant velocity through which the fluid (gas or liquid) flows.