【摘要】 顶驱/转盘驱动的钻具是一个典型的弹性负载,钻井作业时在钻具上储藏了大量的弹性能,此负载特性对控制系统的影响较大。基于此,建立顶驱/转盘所驱动的这种弹性负载的数学模型,推导出了系统的开环和闭环传递函数,从特征方程解析系统的极点分布情况,得出系统稳定的必要条件。采用频域法分析了系统特性,弹性负载在系统中引入二阶振荡环节,其弹性轴的固有振荡频率对系统的稳定性有影响,是潜在振荡隐患,提出了改善系统性能的办法。更多还原

【Abstract】 The drilling tool of the electric drilling rig driven by the top drive rotary table is a typical elastic load,which stores a large amount of elastic energy when doing the drilling works. It has great influence on the performance of the control sys tem of the drilling rig. Therefore,a mathematical model is established,and its closed-loop and open-loop transfer functions are also derived. In this way,the necessary conditions of the system stability are obtained according to the poles distribution by the characteristic equations. Based on the frequency domain method,the second order oscillation link is employed in the elastic load system. However,the system stability is deteriorated by the inherent oscillation frequency of the elastic axis,a novel method that can improve the system performance is put forward.更多还原