Research On Fault Diagnosis Of Piston Pump Loose Boot Based On Virtual Prototype

The plunger pump is the power source and key component in the hydraulic system,and because the working environment of the plunger pump is relatively harsh,it is prone to different types of failures that affect normal production and personnel safety.The loose shoe failure is a common failure mode of the piston pump.Based on the virtual prototype technology,the dynamic analysis model of a certain type of axial piston pump is established.Under the different load conditions,the plunger pump is based on the virtual prototype technology.Boot fault diagnosis study.The main research and results are as follows:(1)Piston pump virtual prototype construction.Analyze the structure and working principle of a certain type of plunger pump,establish a three-dimensional model of the plunger pump in SolidWorks;analyze the constraint relationship and motion coupling relationship between various components during the actual operation of the plunger pump,and successfully build the plunger in ADAMS.The rigid body dynamics model of the pump;the fluid characteristics of the plunger pump are analyzed,combined with the power bond diagram theory,the hydraulic model of the plunger pump is established by AMEsim hydraulic modeling software;the plunger pump is determined by analyzing the vibration transfer mode and path of the plunger pump.The three major components that need to be flexible during the modeling process,namely the pump body,the pump casing and the top cover,establish a rigid-flexible coupling model of the plunger pump in the ADAMS;use the software interface and set the exchange variables to build the virtual piston pump Prototype;simulate and analyze each model built,compare the simulation conclusion with the theoretical calculation conclusion,and verify the accuracy of the model.(2)Fault simulation.The mechanism of the failure of the plunger pump loose shoe is analyzed theoretically.The change of the size gap and the relative motion relationship of the plunger shoe pair when the plunger pump is faulty is determined,and the theoretical basis is studied.The simulation method of the plunger pump loose shoe failure is determined.The size of the fault gap is reasonably set by the structure and size of the plunger shoe pair;the wear amount of the plunger ball head is determined and set,and normal,minor faults and serious faults are established.The virtual prototype of the plunger pump under three working conditions;the vibration transmission path of the plunger pump loosening fault is analyzed,and the method of fault diagnosis based on the vibration signal is proposed,and 5MPa,lOMPa,15MPa and 23.5MPa are set.Four kinds of external loads are used to simulate the variable load condition of the piston pump.The vibration signals of different degrees of loose shoe failure are processed and analyzed under variable load conditions.The variable load of the plunger pump based on the energy characteristics of the vibration signal is proposed.Conditional shoe loosening fault diagnosis method;(3)The loose shoe failure test of the plunger pump was designed.The fault simulation method of artificial wear treatment of the plunger ball head was designed.Under the four kinds of load excitation,the test under the normal conditions of the plunger pump and the loose shoe failure were completed.The theoretical calculation and simulation conclusions and test conclusions were completed.The comparative analysis is carried out to verify the rationality of the plunger pump fault diagnosis method based on virtual prototype technology,and provide theoretical and experimental basis for the virtual prototype-based plunger pump loose shoe fault diagnosis method.The above research results show that the method of fault diagnosis based on virtual prototype technology is effective and feasible.The research results of this paper can provide a new idea for the fault diagnosis of plunger pump.