The mathematical model of dynamic processes in pumping unit of a drilling rig with friction clutch taking into account variable moment of inertia of slider-crank mechanism links and random number of pistons of the pump is developed. Joint integration of differential equations of motion of pumping unit parts is carried out by numerical methods. Calculations performed with considering of torque moment of friction in the clutch and equations of electromagnetic processes in asynchronous motor. The results of research of run-up processes of pumping unit are presented. The influence of parameters of friction clutch on performance of pumping unit is established.
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