低气压和低气温均构成对机车轮周功率(内燃牵引时)和列车阻力的影响。
Low atmospheric pressure and temperature of surrounding air are both effected to locomotive output power at wheel rim and train resistance with diesel traction.
所以胶囊列车在管道内部行进时不会遇到太大阻力，这样就可以用很少的能量行驶非常快。
So now the capsule travelling inside the tube doesn't encounter as much resistance, and therefore can travel really fast with very little energy.
计算得到的不同流线型列车的整体长细比大小排序与其气动阻力系数排序完全一致。
The order of total slenderness ratios of the five trains is as same as that of aerodynamic drag coefficients.
减小列车空气阻力和降低列车交会压力波，既矛盾又统一，列车气动头部外形设计需要综合考虑各种因素。
The aerodynamic shape design of train head should consider all kinds of factors because the relation between reducing aerodynamic drag and air pressure pulse may be conflictive and uniform.
加速度测试法的先决条件是确定列车基本阻力、回转质量系数和列车质量，而其测试关键是列车加速度的测定。
The precondition of the acceleration testing method is the determination of the train resistance, rotary mass coefficient and train mass. The crucial test is measurement of train acceleration.
为了减小空气阻力，列车车厢气动外形的研究变得愈加重要。
To decrease aerodynamic drag, it is important to improve aerodynamic contour of train.
通过表面积分的方法得到各种列车车头的阻力，进而计算得到了车头模型的阻力系数。
Drag of the train head is obtained by the method of surface integral and drag coefficient can be computed at the same time.
车辆起动阻力是列车牵引计算、车站站坪坡度设计的基本参数和重要依据。
The starting resistance of a roller bearing wagon is an elementary parameter and an important basis for traction calculation and the gradient of station yard design.
对于同一种车型改变了它的细长度得到一系列车头模型，分析计算了细长度对车头阻力系数的影响。
A series of train heads is obtained by changing the rate of length and width of a certain train head, in order to know if the rate will affect the drag coefficient.
为了研究列车车头形状的变化，给空气动力学特性带来的影响，尤其是对车头阻力的影响，本文提出了五种列车车头模型。
In order to research how changing the figure of the train head influences aerodynamic characteristics, especially train head, the thesis brings forward five kinds of models of train head.
在高速列车空气阻力计算中，多竖井隧道的列车空气阻力计算比较复杂，其难点在于多竖井的活塞风计算。
It is very complex to calculate the aerodynamic drag of high-speed train running in railway tunnel with multi -shafts. And the difficulty is to calculate the velocity of piston wind.
采用数值模拟方法研究了列车风挡对空气阻力的影响。
The numerical simulation research on aerodynamic drag of train affected by the train windshield configuration is performed in this paper.
采用数值模拟方法研究了列车风挡对空气阻力的影响。
The numerical simulation research on aerodynamic drag of train affected by the train windshield configuration is performed in this paper.
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