Analysis On Vibration Characteristics Of Hydraulic Fracturing Truck And Hydraulic Pipeline

As people consume more and more energy,the amount of unconventional energy represented by shale gas is gradually increasing.Fracturing technology has attracted more and more people's attention as a common method for the exploitation of shale gas and other oil and gas resources and the reconstruction of existing oil wells.Fracturing truck has been widely used as a movable fracturing mining equipment.A domestic 2500 type fracturing truck may have hydraulic pipeline oil leakage when performing fracturing operations.This research uses this model of fracturing truck as the research object,analyzes the vibration characteristics of the hydraulic fracturing truck and the cause of oil leakage in the hydraulic pipeline and proposes solutions.First,simplify the structure of the chassis vehicle and hydraulic fracturing vehicle to establish the geometric model of the chassis vehicle and hydraulic fracturing vehicle.On the basis of the geometric model,the finite element model of the chassis vehicle and hydraulic fracturing vehicle is established and the modal analysis is carried out.Through the results of modal analysis,it is found that the natural frequency of the hydraulic fracturing truck is close to the excitation frequency of the top-mounted engine,which leads to severe vibration when the hydraulic fracturing truck is working.After that,use the LMS system to test the modalities of the chassis vehicle and the fracturing vehicle and compare the test results with the finite element simulation results to modify the finite element model of the hydraulic fracturing vehicle.The binocular camera was used to test the displacement of the hydraulic pipeline interface under the excitation of a single engine.Through the test results,it is found that a relatively large relative displacement occurs at the interface of the hydraulic pipeline under the excitation of the engine.Large relative displacement at the pipeline interface will cause oil leakage problems in the hydraulic pipeline when the fracturing truck is working.Then,reduce the acceleration response of the hydraulic oil pump by reducing the engine excitation and changing the oil pump layout.Select suitable vibration isolation pads for testing and compare with the finite element model to ensure the accuracy of the model.The vibration isolation pad is added to the finite element model of the fracturing truck and the fracturing truck is excited.The simulation results show that the appropriate vibration isolation pad parameters can help reduce the vibration of the oil pump.By changing the series oil pump to the parallel structure,the acceleration response of the oil pump end can be effectively reduced,and the improvement suggestions are put forward based on the analysis results.Finally,a finite element model of the hydraulic pipeline is established.By calculating the natural frequency of the hydraulic pipeline under empty and filled conditions,it is found that the natural frequency of the pipeline is relatively large,and the hydraulic pipeline will not resonate under the excitation of the engine or the hydraulic oil.The simulation method is used to analyze the pipeline under the excitation of hydraulic oil,and it is found that the displacement of the hydraulic pipeline interface under the excitation of oil pressure is much smaller than the test result of the binocular camera.Therefore,it is judged that the hydraulic oil excitation is not the main reason for the oil leakage in the hydraulic pipeline.