对于单马达转向架，转向架上的两根轴由同一个马达驱动，常常会遇到扭转的共振，这将导致周期性的滑动。
Monomotor bogies, where both axles of the bogie are driven by a single motor, often encounter torsional resonances, which lead to periodic longitudinal slip.
从光的电磁理论出发，导出了光在单负材料周期性结构的传输矩阵。
Based on electromagnetic theories, the expression of transfer matrix of periodical structure formed by single-negative materials is deduced.
单索循环轻型运材索道的钢索在每一工艺循环中，要承受静力和规则运动与不规则运动动态力的周期性作用。
The cable in the one-way cyclical light running cable-way Sustains the cyclical actions of the static force, the dynamic forces of law and non-law motions in every technological cycle.
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