Modeling And Simulation Research Of Hydraulic Impactor Based On AMESim

As the main operating mechanism and core device of the modern hydraulic hammer,hydraulic rock drill and drilling jumbo, the hydraulic impactor plays an irreplaceableimportant role in the field of national economic and national defense construction, such asroad construction, mining, building, etc. So the research of the theory and experimentresearch on the hydraulic impactor has impactant practical significance. LMS Imagine. LabAMESim, advanced modeling environment for simulation of engineering systems, uses themodeling method based on physical graphics and it is used in modeling and simulation ofinterdisciplinary field including machinery, electricity, fluid, electromagnetism,control, etc.In this paper, the developing situation and research method on the impactor were dicussed.The component level and system level simulation model of impactor were built based onAMESim and the experimental research was carried on the basis of the theoreticalanalysis.The primary contents and work are as follows:(1) The developing situation, developing trend and theory research method weresystematically discussed and the basic theory on modeling and simulation of hydraulicsystem was summarized. The operational principle of hydraulic impactor was analysed indetail, the CAD model was built using CATIA soft and the nonlinear mathematical modelof impactor was built.(2) The simulation models of the gas-liquid united impactor key parts includingnitrogen chamber, cylinder body and hydraulic operated directional valve ware establishedbased on AMESim. The simulation models of constant power variable pump and reliefvalve were established with the excavator hydraulic system as physical prototype and thefunction verification of the models was carried on. According to the operational principleof hydraulic impactor, the simulation model of impactor system was established. Themovement rules on piston and valve spool, the pressure of front and back cavties and thesystem supply flow rate were simulated. The impactor structural parameters wareoptimized with NLPQL algorithm and the performance of impactor was improved obviously. And relevant test of the gas-liquid united impactor was carried on. Through thecomparative analysis between simulation and experiment data, the system simulationmodel was accurate and the impact energy error between simulation and experiment wasless than20%.(3) The new type hydraulic impactor based on threaded cartridge valve was designed,the physical prototype was made and the related test was carried on. Based on the analysisof operational principle, the mathematical model was established. The simulation model ofthe threaded cartridge style hydraulic control check valve was built with AMESim and thesystem simulation analysis was carried on with the constant pressure source as oil feedingsystem. The results of simulation and experiment show than the structural style of the newtype impactor was completely feasible.(4) The theory of the valveless hydraulic impactor was analyzed, the simulation modelbased on AMESim was established and the work performance was analyzed in the form ofsimulation. Simulation results show than the valveless impactor had the advantages ofhigher frequency and steady performance. The valveless impactor has the certainapplication value.(5) The theory of impact energy testing was researched. The F-S method wasimproved and the instrumented impact testing method was put forward. The hitting forcetesting device was designed and made for the instrumented impact method. The dataacquisition program of hitting force was written with VC++and the data acquisition ofhitting force was achieved.