学术论文

      钻杆纵-扭耦合振动两自由度模型的动力学分析

      Dynamics analysis of couple axial-torsional vibrations of drill-strings with two degrees of freedom

      摘要:
      基于钻杆纵向和扭转振动耦合的两自由度模型,结合钻头所受纵向力和扭矩模型的简化,利用平均法讨论了主要工作参数以及外界介质参数对其周期振动振幅和频率的影响,并进行了数值仿真验证.此外还利用数值计算仿真了工作参数和介质参数对粘滑运动的影响.结果表明,转盘转速的增加会使扭转振幅增大,但是适量增大转盘转速可以有效降低钻杆粘滞时间,减弱粘滑振动现象.钻头与岩石间的摩擦系数的增大会使相对角位移增大,粘滑现象更加明显,粘滞时间变长.
      Abstract:
      Nonlinear dynamics of drill-strings is presented based on a 2DOF model which considers the coupling between axial and torsional vibrations and a simplified contact model in this paper.Both the averaging method and the numerical method are simultane-ously used to investigate the influence of parameters in the governing equation such as rotation speed at the surface and friction efficient.It is found from the analytical results that both the variations of frequency with amplitudes and the variations of amplitude with rotation speed at the surface and friction coefficient are non-linear for harmonic motions. It is observed from the simulation results that the amplitudes of stick-slip motions with shorter stick time are larger for higher rotary speed and the stick time in stick-slip motions are longer for larger friction coefficient.
      Author: HAN Shankai LI Xinye HOU Shujun CHEN Tao
      作者单位: 河北工业大学 机械工程学院,天津,300130
      刊 名: 燕山大学学报 ISTICPKU
      年,卷(期): 2017, 41(3)
      分类号: O322
      在线出版日期: 2017年8月2日
      基金项目: 河北省高层次人才资助项目