Research On Diagnosis Of Wear Fault Of Swashplate Of Piston Pump Based On Virtual Prototype

As the core part of the hydraulic system,axial piston pump is widely used in many mechanical products.Usually the working environment of the pump is severe,which leads to the failure of the piston pump easily and accidents.This paper takes the swashplate wear fault as research object with the model of piston pump to study he research of swashplate wear fault of piston pump further.The main research work and results are as follows:(1)Establishing the virtual prototype model of piston pump base on ADAMS and AMESim.The 3D model of axial piston pump is established by mapping the swashplate axial piston pump with 3D modeling software.Based on.the analysis of the dynamic characteristics and equations of motion of the piston pump,the expression of the relative motion relationship between the components is obtained.The multi-body dynamic model of the piston pump is established in ADAMS,and the parameters of the related constraint pairs are optimized.Simplify and optimize the overall model according to the actual working conditions.Based on the analysis of the dynamic and fluid characteristics of the piston pump,the simplest moving unit model of a single piston,the port plate model and the volume sub model of the piston cavity are established respectively.After the package of super components,the power components and auxiliary components are added to complete the simulation model of 7-piston pump.Data is exchanged through ADAMS and AMESim interface to complete joint simulation of piston pump virtual prototype.The dynamic characteristic of virtual prototype conforms to the theory is verified by simulation and theoretical calculation.(2)Establish fault model.Based on the analysis of the failure mechanism of the swashplate wear fault and the failure characteristics under different wear conditions,the injection scheme of the virtual prototype swashplate wear fault is determined.The virtual prototype models with different wear conditions are established and classified into normal,slight and serious faults.The pressure and vibration signals are selected based on the actual situation,and the dynamic response conditions under normal and fault conditions are compared through simulation.The sensitive characteristics of the swashplate wear fault are obtained by signal processing.(3)The experiments are designed and completed on the experimental platform of the piston pump.The sensor and data acquisition instrument are used to complete data acquisition.The time-domain and frequency-domain responses of vibration signals under normal and fault conditions are obtained by signal processing.The time-domain and frequency-domain characteristic parameters under different conditions are compared to explore the sensitivity of different characteristics to swash plate wear fault.Compared with the simulation and experimental results,it is verified that the method based on virtual prototype is feasible to extract the wear fault features of the swashplate of the piston pump.The research on this method can provide reference for the fault diagnosis and monitoring of the piston pump.