Vibration above neutral point of stem caused by eddy movement and collision and inhibited by drilling fluid damp during transmitting upward.

 
  • 渦動(dòng)和碰撞引起的中性點(diǎn)及中性支以上的振動(dòng),在向上傳播過(guò)程中被鉆井液阻尼抑制;
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