模型采用三层结构，输入变量有水射流压力、水喷嘴直径、磨料粒子粒度(直径)、磨料流量和切割头进给速度。
Three layers network topology is adopted. The input variables are water pressure, diameter of orifice, diameter of abrasive particles, flow rate of abrasive and feed rate of cutting head respectively.
根据三种经典的基于密度的交通流参数模型，分别推导了三种占有率速度模型和占有率流量模型。
In accordance with three classical traffic flow parameter models based on density, three kinds of occupancy-speed models and occupancy-flow models are deduced in this paper.
积分后，得到了匝道单车道流量与匝道连接处速度、密度和流量的理论关系模型。
The relationships between traffic parameters, such as the ramp flow, speed, density and mainline flow at the ramp junction, are established by mapping time-space plane to speed-density plane.
结果表明，不采用多孔介质模型计算的气泡的逃逸速度比采用多孔介质模型大，且随着底吹流量的增加，偏差加大。
The results show that when the porous media model is not used, the calculated escape velocity of bubbles is larger, and the difference becomes larger with increasing the gas flow rate.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
车流密度、行车速度和交通流量是反映交通流特征的三个基本参数，三者关系的确定和模型的建立是交通工程理论研究的基础。
The models of traffic density under the conditions of different levels of service are established according to the basic relationship among the velocity, volume and density.
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