基于DEM-MBD耦合的液压挖掘机动力学仿真分析

在实际工况下，液压挖掘机工作装置受到的载荷较大且具有强时变性，因此工作装置各组成杆件及液压缸较易出现各种形式的失效。针对以上问题，选取某型号液压挖掘机作为研究对象，根据液压挖掘机工作装置实际挖掘物料工况，利用多体动力学软件ADAMS建立液压挖掘机虚拟样机模型并利用离散元软件EDEM建立物料模型。通过DEM-MBD耦合仿真分析方法，对液压挖掘机工作装置进行动力学仿真分析，主要获取挖掘物料过程中铲斗受力变化曲线、不同时刻铲斗受力云图，通过对其分析，能够获取铲斗在挖掘作业过程中受力变化情况，为铲斗的有限元分析、优化设计提供理论依据。

Dynamic Simulation Analysis of Hydraulic Excavator Based on DEM-MBD Coupling

Under actual working conditions,the working device of hydraulic excavator is subject to large loads which has strong time-varying characteristics.Therefore,various forms of failure are more likely to occur in each component bar and hydraulic cylinder of the working device.To solve the above problems,a hydraulic excavator was selected as the research object.According to the actual working conditions of the hydraulic excavator working device,the virtual prototype model of the hydraulic excavator was established using the multi-body dynamics software ADAMS and the material model was established using the discrete element software EDEM.Through the DEM-MBD coupling simulation analysis method,the dynamic simulation analysis of the working device of the hydraulic excavator was carried out.The force change curves of the bucket in the process of excavating materials and the force nephograms of the bucket at different times were mainly obtained.Through analyze the results,the force change of the bucket in the process of excavation can be obtained,which provides a theoretical basis for the finite element analysis and optimization design of the bucket.