Shock and Vibration / 2020 / Article / Fig 5

Research Article

Study of Radial Vibration Impact on Friction and Torque of Rotary Drill String

Figure 5

Curves of the average of torque changing with . (a) Rotation speed Vr = 30 r/min. (b) Rotation speed Vr = 45 r/min. (c) Rotation speed Vr = 60 r/min.

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