摘要：AbstractThis paper studies wave propagation control in a one-dimensional (1D) wave guide using a single actuator at the boundary, which relates to an important problem of drilling torsional vibration mitigation in oilwell drilling. Using measurements of both time and spatial derivatives of the drillstring rotational angle at the surface, the torsional wave in the drillstring is decomposed into two independent wave components traveling in opposite directions based on the d’Alambert solution. A top drive speed control method is proposed to mitigate torsional vibration in drilling by reacting to each wave component differently. The method was validated by numerical simulation, which demonstrated its capability for preventing and eliminating stick-slip—a form of torsional vibration that is considered the most common and detrimental type of vibration for drilling. A laboratory experimental platform was also designed and constructed to replicate the torsional vibration time response of drilling system. Preliminary experimental results confirmed the effectiveness of proposed method for torsional vibration mitigation.
