Analysis And Study Of Dynamic Characteristics Of Power End Of 2200HP Five-Cylinder Mud Pump

As an important equipment for oil production,five-cylinder mud pump to highpower,large displacement and high pumping pressure and other directions,fivecylinder mud pump overall performance and structure size depends on the power end of the important components of the crankshaft and connecting rod,and directly determine the working performance of five-cylinder mud pump.The subject originated from a technical cooperation contract for a five-cylinder slurry pump from an enterprise,and a series of studies on the dynamic characteristics of the power end under different working conditions were carried out according to the relevant design parameters.The main research content is as follows:Firstly,the overall transmission scheme of the 2200 HP five-cylinder mud pump is determined,the relative position of the crankshaft crank is reasonably arranged,and the working principle and structural composition of the five-cylinder mud pump are introduced.The performance parameters are determined by calculation,and a parameter table is developed for three working conditions with stroke times of 120min-1,90 min-1 and pump pressure of 64.6 MPa.Then,the kinematic analysis of the power end of the 2200 HP five-cylinder slurry pump was carried out,and the kinematic changes of the pistons and connecting rods of1#～5# at the stroke times of 120min-1 and 90min-1 were calculated using Matlab software;a multi-body kinematic model of the power end was built in ADAMS,and the kinematic characteristics of the pistons of 1#～5# under the two working conditions were proved to be consistent with the results of the calculation and analysis through simulation experiments.Next,the dynamics of the power end of the 2200 HP five-cylinder slurry pump was analysed to obtain the load expressions of the crank,connecting rod and crosshead,and the load variation of the crank connecting rod system from 1# to 5# at a stroke time of120min-1 was analysed using Matlab software.By building a multi-body dynamics model,the load variation curves of the crank,connecting rod and crankshaft journal were simulated for three operating conditions: 120min-1,90min-1 and 64.6MPa pump pressure,and the load variation of the crank connecting rod system from 1# to 5# at120min-1 was verified to be consistent with the load variation analysed by Matlab.Again,modal analysis and harmonious response analysis were carried out on the power end of the 2200 HP five-cylinder slurry pump in ANSYS Workbench software to study the inherent frequency,vibration pattern and frequency response characteristics of the power end system,and to find the response frequency points with the greatest influence on the vibration displacement amplitude of the power end system at 600 Hz and 1050 Hz.Finally,with the help of Hypermesh and ADAMS software,a multi-body dynamic rigid-flexible coupling model of the power end of a 2200 HP five-cylinder slurry pump was constructed to investigate the dynamic characteristics of the crank connecting rod system under three operating conditions with stroke times of 120 min-1,90 min-1 and pump pressure of 64.6 MPa,and to investigate the stress-strain conditions of the crankshaft and connecting rod.Through theoretical derivation and numerical simulation,the motion law and load variation law of 2200 HP five-cylinder slurry pump were obtained.Through the modal harmonic response analysis,it is found that the external excitation force frequency of600 Hz and 1050 Hz has a greater influence on the inherent frequency of the system.Through the rigid-flexible coupling simulation analysis,it is obtained that the performance is stable under the action of dynamic characteristics at three working conditions,and the strength of the crank and connecting rod meet the design needs.