Research On Semi-physical Load Simulation Platform For System Matching Of Excavator

System matching is an important research content in the development process of excavators,domestic excavator enterprises usually test the matching performance of excavator based on the traditional system matching test bench.At present,most of the system matching test platforms of excavator on the market are pure physical simulation test platforms with the capability of load spectrum automatic injection test.The engine,pump,valves of the tested excavator are connected to the test bench and controlled by controller according to the test program.The pilot system and load system are adjusted to simulate the real operating conditions,and the operating parameters are collected to analyze the matching performance of the system.The traditional system matching test bench doesn’t have the real-time simulation function of dynamic mining load,only on the premise that the assembly was completed and the experimental load spectrum under the corresponding working conditions was collected,the load test simulation of the component performance and system matching performance of the excavator can be performed.However,in the development process of new products,the use of traditional system matching test bench cannot test and verify the designed system performance at the early stage of product development,and cannot provide designers with a reliable design reference.In order to make up for the shortcomings in the testing process of the traditional excavator system matching test bench,to verify and debug the performance of the system in the core component selection stage of the initial design process of new products.This paper adopts the idea of semi-physical simulation testing to build a realtime simulation system of dynamic load during excavation work,which is combined with the school-enterprise cooperation project "Semi-physical Load Simulation Platform Construction of System Matching Laboratory ".Based on the traditional system matching test bench,combined with the hydraulic and power system of the excavator,a semi-physical load simulation platform for the excavator system matching was built.With the load simulation system as the core,the kinematics,dynamics and mining load simulation analysis models were built.Taking the load spectrum collected from the excavator experiment as a reference,combined with the discrete element and multibody dynamics co-simulation(DEM-MBD)method,the key soil parameters of the excavation load model were modified,and the accuracy of the load simulation was verified and analyzed.The real-time load simulation system was connected to the test bench,and the experimental scheme was designed according to the loading principle.Operated the pilot handle to simulate the real excavating conditions to verify the accuracy and real-time performance of load simulation.The energy consumption,efficiency and power flow characteristics of the test bench were collected and compared with the system performance of the excavator experimental to verify the test accuracy of the system matching performance of the semi-physical load simulation platform.Through the construction of the semi-physical load simulation platform,the laboratory test data is more accurate,the test environment is closer to reality,to realize the pre-test,avoid R&D risks,shorten the R&D cycle,and the expected goal of improving the system matching performance test capability is achieved.