牵引系数（traction coefficient）是指用于拖拽或承载重物的机械装置，动轮或履带之上的总载荷与动轮发生空转之前，其与路面之间产生最大牵引力的比值。
研究了腔牵引效应、微波功率频移、光频移和缓冲气体温度系数对铷频标输出频率的影响。
The cavity pull effect, microwave power shift, light shift and temperature coefficient which mostly influence the performance of RAFS are studied.
最后，分析了机车牵引动态模型，并且建立了干扰观测器的粘着系数估计系统。
Finally, the dynamics of locomotive traction are analyzed, and a disturbance observer is used to estimate adhesion coefficient.
单边直线感应电机运行中因次级板产生涡流而存在第二类纵向边缘效应，造成气隙有效磁通和牵引力系数降低。
The LIM has the second longitudinal end effect caused by eddy currents in secondary plate in its operation, which reduces its available magnetic flux of air gap and pull coefficient.
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