高频电弧的最大轴向压力大于直流电弧。
The maximum axial, pressure of the high frequency arc is higher than that of the DC arc.
当初弯曲最大挠度比较大时，对于受侧向力作用的较长管柱，初弯曲对管柱轴向临界压力影响很大，必须加以考虑。
When the initial deflection of a long pipe subjected to lateral loads is large, the effect of the initial deflection on critical buckling force for the pipe must be considered.
钻柱横向非线性振动的基频随着初弯曲最大挠度的增大而减小，初弯曲对钻柱横向非线性振动基频的影响随钻柱长度的增大而增大，随轴向压力的影响而增加。
The effect of initial deflection on the first frequency increased with either the length of drill stem or the axial compressive force on the drill stem increases.
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