Co-Simulation Modeling And Research On Loader Working Device Mechanical And Hydraulic System

Loader is earthmoving machinery used for spading,transport and handling operation.As the core part of the loader,the tooling system has a direct effect the operating efficiency.The traditional test method is usually used to analyze this system,and evaluate system performance.But due to the high cost and the long development cycle,it is difficult for traditional test method market the requirements for the diversification and rapidly product replacement.The development of simulation technology can solve this problem well,and it is convenient for the enterprise research and development department to analyze the performance of the tooling system.Traditionally,the loader of high power driven by hydraulic is usually divided into two sub-systems that are machinery and hydraulic pattern systems for purpose of analysis.The interaction between the two systems is simulated by defining signals,but the accurary can not be guaranteed.Based on such facts,The working devices of the loader and the theory of hydraulic system were introduced.CATIA software was used to establish the model of working devices of the loader.Then the model was imported into LMS Virtual.Lab Motion software for adding kinematic pair,force and drive.The performance index and maximum breakout force during test were used to verify the accuracy of virtual prototype model.AMESim software was used for establishing hydraulic model of loader tooling loop and the accuracy of AMESim dynamic model was verified by maximum breakout force obtained during test.Lastly,the mechanical-hydraulic integration made of tooling system was obtained by combining AMESim model and virtual prototype in co-simulation way and its performance was also investigated.Firstly,the motion and dynamics behavior of the working devices were analyzed,and the working performance curves were obtained.Secondly,the speed adjustment features of tooling loop during lifting process was analyzed.At last,the hydraulic system efficiency in the typical operating mode for the loader was analysed.The efficiency was 44 percent for the analyzed hydraulic system,51.8 percent for double pump combined unloading system,and 76 percent for load sensitive hydraulic system.The research showed that the performance of tooling system could be reflected accurately by establishing mechanical-hydraulic integration model.The methodology mentioned above could be applied to analyze the dynamics of the loader and improve hydraulic loop,and also provides reference for analyzing other machanical-hydraulic integrated systems.