double track structure 双流道结构
The lower structure in the coupling system is railway track where rails are considered as beams with finite length rested on double layer continuous elastic foundation.
下部结构为轨道，钢轨被离散为双层弹性基础上有限长度的梁。
Using the continuous elastic double layers beam model of track structure, the forces between the sleepers and the tunnel inlay produced by the running of certain subway train were calculated.
采用施加在轨道上的一系列移动轴荷载模拟列车作用，利用轨道结构连续弹性双层梁模型，计算出某城市地铁列车运行产生的轨枕与隧道之间的作用力。
The track, transmission system and the structure of double guns gas cutting machine are introduced. The measures of reconstruct and design features are put forward.
着重介绍双头气割机的导轨、传动系统及机体结构的设计分析，提出了这次改造的方案。
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