手旋钻
This paper studied the annulus whirl ing motion of rotary drill string.
把旋转钻柱简化为一内外有流体的柔性转子系统,分析了在内外钻井液流体作用下的钻柱涡动行为。
whirler crane:旋转式起重机
whirl spreader 旋涡式摊铺机 | whirler crane 旋转式起重机 | whirler drill 手旋钻