【摘要】 应用机械振动理论 ,对液压抽油机的动态特性进行了分析。结果表明 ,液压抽油机在准匀速悬点运动条件下 ,抽油泵的运动由两部分组成 :一是随悬点一起的刚体运动 ,二是由于悬点支撑位移激发的振动响应 ,其振动频率为系统的固有频率。适当调整系统参数 ,抽油泵将出现超冲程现象 ,这对于提高采油效率将是有益的。在准匀速悬点位移作用下 ,将引起抽油杆柱的振动 ,导致杆柱中的动应力。杆柱中的最大振动位移随深度增加量值逐渐增大 ,最大动应力随深度增加而逐渐减小。最大动应力随深度不是线性变化的 ,而是为二次函数关系更多还原

【Abstract】 The dynamic analysis of hydraulic pumping units was carried out in this paper by using the theory of mechanical vibrations. The house-head movement of the pumping unit is mainly uniform,except the alternation period of upper-and down-strokes.Under the action of the house-head movement,the vibration of the system,the sucker-rod and,furthermore,the dynamic stress will be induced.The results indicate that the movement of the downhole pump includes two parts. One is the movement following the horse-head.The other is the dynamic response excited by the support movement.When the parameters of the system are selected reasonably,over-stroke of the pump will appear.This is because the movement of the hydraulic piston obeys a particular law.The maximum displacement increases,and the maximum dynamic stress decreases with depth.The changing of maximum dynamic stress with depth obeys quadratic law.更多还原