Top-down Design And Co-simulation Of Beam Pumping Unit

The Beam-Pump occupies the vast majority in the existing oil recovery machinery,for its inefficiently traditional design method(bottom-up),and the research of the use of top-down design method to design the Beam-Pump is less.Therefore,in the paper,according to the basic parameters of the pumping unit,the top-down parametric design of the Beam-Pump is carried out,which is of great significance to reduce the costs of and shorten the cycle of product design.For the Beam-Pump being a multi-component system,in the course of its work,especially the connecting rod,the key components of the Beam-Pump prone to fatigue damage under the cyclic alternating loads.At present,the fatigue prediction of the key components of the Beam-Pump is usually static load method,which is not insufficiently accurate and does not match the actual.Therefore,how to use the dynamic method,which is of great significance to its fatigue prediction,to study the fatigue life of key components of the Beam-Pump.Taking a kind of Beam-Pump as the research object,which is designed with the method of top-down design and studied by the means of co-simulation.The specific research work and results completed is as follows:(1)Taking Creo as the platform,the parametric design of the Beam-Pump was carried out by using the method of top-down design.In view of the structural complexity of the Beam-Pump,which was divided into four modules.The sub-skeleton model was established for each module,as the intermediate hub,which delivered the top-level design information and ensured that the datas were closely linked throughout the design process of the design.It was using this design method that achieved the result of the rapid design of the model,shorten the cycle of product design,so that the efficiency of the design to the Beam-Pump was greatly improved.(2)It carryed out the calculation and transmission of the parameters’ design of the Beam-Pump,using the seamless integration of Mathcad and Creo.This design method was calculated from the parameters of the Beam-Pump to the formation of its assembly model.If the whole process of the parameters of the calculation,the results could be timely transfered to the geometric model,quickly and accurately.The method of the design maked up the deficiency of the traditional design calculation and promoted the improvement of the design efficiency.(3)The 1D simulation model of the Beam-Pump was established and the motion and dynamic characteristics of its hanging point were simulated and analyzed in the AMESim software.The results of the displacement,velocity,acceleration and load of the simulated suspension were compared with the theoretical calculation,whose accuracy was verified.(4)The multi-rigid body dynamics model of the Beam-Pump was established in Motion software,and basing on the AMESim 1D and Motion 3D co-simulation method,the dynamic simulation analysis of the Beam-Pump was carried out.The time course of the head of the donkey and the main dynamic forces and forces of the hinge and the gear meshing force of the gear unit were obtained.(5)The dynamics analysis of the rigid flexible coupled model of the Beam-Pump of the flexibility of connecting rod was carried out,and the inherent characteristics of the connecting rod were obtained,which showed that the inherent amplitude of the middle part of the connecting rod was the largest.By comparing the simulation results of rigid-flexible coupling dynamics with the simulation results of rigid body dynamics,it was found that the dynamic characteristics of the connecting rod system could be more truly reflected after the flexible rod.The stress and the deformation of the connecting rod were analyzed,which showed that the maximum stress on the connecting rod located at the transition fillet of the connecting rod structure,and the maximum deformation occurred at both ends of the connecting rod structure.(6)The modal participation factor of the connecting rod were obtained by the rigid-flexible coupling kinetics.The modal participation factor and the modal were linearly superimposed and obtained the load history of the connecting rod.With its results as input datas for fatigue analysis,the system-level fatigue analysis of the connecting rod was carried out using the Durability module of Virtual.Lab,and obtained accurate the fatigue life and damage distribution of the rod and the location of fatigue damage of the rod was determined.The results of the study could provide some important references for the study of the fatigue life of the key components of pumping unit.This method also provided a reference for predicting the location of the early fatigue damage and the fatigue life of similar mechanical products,and was also very practical for other related fields.