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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
The mechanical vibration theory is used to analyze the dynamic characteristics of hydraulic pumping unit. The results show that under the condition of quasi-constant speed, the motion of the pump consists of two parts: one is the rigid body movement along with the suspension point, and the other is the vibration response induced by the displacement of the suspension point support. The vibration frequency The natural frequency of the system. Appropriate adjustment of system parameters, sucker-pump will appear over-stroke phenomenon, which is to improve oil recovery efficiency will be beneficial. Under the action of quasi-uniform displacement, the vibration of sucker rod column will be caused, which will lead to the dynamic stress in the column. The maximum vibration displacement in the column increases with the increase of depth, and the maximum dynamic stress decreases with depth. The maximum dynamic stress does not vary linearly with depth, but rather as a quadratic function