Based On The Coupled Dynamics Of The Mud Pump Power End Fatigue Life Prediction And Parameter Optimization

Mud plays a pivotal role in the oil drilling, it is a essential equipment in theprocess of oil drilling. Its main function is inject mud or water downhiller in the drillingprocess, has a bit of cooling, carrying cuttings and cleaning tool, protecting boreholewall, and so on. The type of oil drilling mud pump which has been widely used to thecurrent domestic is triplex reciprocating pump, its disadvantage is that the workefficiency is low, the feature parts is short life and large. The performance and size ofthe mud pump power end determines the performance and size of the mud pump, whilethe connecting rod and the input shaft is the importent components of the mud pumppower end. In the process of the actual project work connecting rod under alternatingstress, stress distribution is complicated, while the input shaft is weak parts in the mudpump power end, intensity is small, the stress concentration. In view of the connectingrod and the input shaft dynamic analysis, this paper observes the stress concentrationareas, and carries on fatigue life prediction. On the premise of guarantee its fatiguereliability parameter optimization, the mud pump as a whole can be more in-depthunderstanding of its working characteristics and stress state, for the mud pump overallperformance improvement and provide reliable data and reference for lightweight.The article main research content is made up of the following parts:The first part: Mud pump power end of rigid body dynamics analysis, using planarkinematic analysis of the mud pump power end bearing, explore the mud pump forceand motion. Mud pump power end three dimensional rigid body model is established,and motion simulation in the dynamic analysis software ADAMS, for mud pump powerend and the kinematics of input shaft connecting rod curve and stress distribution.The second part: Mud pump power end the coupled dynamics analysis, theconnecting rod and the input shaft in Hypermesh modal analysis for parts in prone toresonance and destructive area and provide data reference frequency. The coupleddynamics model is set up and run the simulation results compared with the results ofrigid body dynamics, studying the characteristics of the dynamics of flexible bodyconnecting rod and the input shaft conforms to the actual situation, the method forkinematic characteristics the mud pump power end to provide accurate data support,also provides a new method for dynamic analysis.The third part: For connecting rod life prediction with the input shaft, find out thestress concentration area, and a calculation is made on the results, to predict the servicelife of the parts. Finally, the stress concentration area improvement measures are putforward.The fourth part: Connecting rod and the parameter optimization of input shaft, inguarantee under the premise of connecting rod and the input shaft fatigue strength usingthe Fmincon function in Matlab connecting rod and the input shaft to optimizeparameters and provide reference basis for mud pump overall lightweight design.