In this paper the railway track is considered as a double elastic system of both rails and sleepers and the vibration is described in detail with two partial differential equations.
本文将铁路轨道看作由钢轨和轨枕组成的双层弹性系统，用两个偏微分方程联立描述其振动。
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。
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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