| At present, in order to reduce the fatigue fracture and tripping of sucker rod, the rod string absorber is usually installed in the sucker rod movement system to lower the damage to sucker rod from shock and vibration load. This paper systematically analyzed the damping principle and structural features of the rod string absorber with hydraulic damping used in beam-pumping unit, and the damping characteristics mathematical model of the rod string absorber was set up based on the hydromechanics theory, and the key factors of affecting the damping characteristics have been theoretical analyzed. To get the pressure distribution and fluid flowability of the flow field in the rod string absorber, and have more in-depth understanding of that, the flow field has been analyzed by the use of fluid simulation software ANSYS CFX. At the same time, systematically studied the effect rule of damping aperture size?annular gap height?the impact speed?oil viscosity and other parameters to the damping force based on fluid dynamic theory simulation. The damping force measuring device aimming at the absorber was designed, and an indoor simulation experiment about the factors affecting the damping performance of the absorber was carried out, and the experiment and the simulation results got analyzed comparatively, and verified the result of simulation. This provides a quick and effective method for structure improvement of the absorber. |
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