Study On The Method Of Dynamics Simulation For The Beam Pumping Unit

Sucker rod pumping system is a complicated multi-parameter system, and domestic and overseas scholars have done a lot to the dynamic simulation of the system.On this basis, the paper studied further on the dynamic simulation of the ground installation of the well——the unit and improved the torque of the crank and the transient efficiency of the belt transmission models.It provided the basic theory for improving accuracy of the dynamic parameters and the efficiency of the system. The main results of the research include:Considering the static load, the friction load and the dynamic load, the wave equation was used in the paper for simulating the rod axial vibration. Involving the influence on the bottom boundary condition of the axial vibration of the rod,such as loss of hydraulic pump and liquid friction load on the plunger, a simulation model was established for the polished rod load.It provides the boundary conditions for the dynamic simulation modeling.Based on the equivalent force in the pair of the reversing mecharism and the inertia of the movement,the crank torque and the rigid body of reversing mechanism simulation models were established.As the friction exist in the pair is considered,the equivalent dynamic mathematical model of the system is nonlinear.Using iteration, the non-linear dynamic equations turned linear.Then the numerical solutions of the torque is obtained by programming.Acording to the fluctuation of the torque on the crank and the flexibility of the belt in the transmission, the torsional vibration of the model is set up.By analysing the characteristic of it, the transient efficiency of the belt transmission is solved by simulation calculating.