ADDITIONAL VIBRATION STRESS AT THE POINT OF SUSPENSION OF THE ROCKING MACHINE

When pumping oil by deep plunger pumps driven by rocking machines, at the beginning of the movement of the pump plunger up to the rods applied a significant inertial load caused by the weight of the liquid column. A tensile wave propagates along the rods, which causes significant additional stress at the point of suspension of the rods. The purpose of this article is to determine the magnitude of this additional vibration stress. The differential equation of free oscillations of the rod, which is a column of rods, is solved by the Fourier method under appropriate initial and boundary conditions. As a result, the function of elastic oscillations of the rod column and the magnitude of the additional vibration stress at the point of suspension of the rods. In the future, the obtained solution will be compared with the known solution of the same problem by Virnowski, and the function of the velocity of the cross- sections of the rods at the beginning of the movement of the pump plunger will be investigated.