电液疏浚抓斗挖掘过程离散元仿真研究

Discrete element simulation research on excavation process of electro-hydraulic dredging grab

为了研究电液疏浚抓斗在挖掘过程中的力学特性和挖掘物料的变化趋势,在确定抓斗的结构参数和物料参数的基础上,建立基于EDEM的抓斗挖掘离散元仿真模型,并进行不同挖掘深度的试验。对比分析理论计算结果和仿真结果,发现抓斗的斗齿和底板这两个主要受力结构的挖掘阻力随抓斗的挖掘深度的增加而增大,且在仿真过程中,这两部分的挖掘阻力随时间呈现出不同的变化趋势,仿真结果和理论计算结果的变化趋势基本吻合,验证了仿真结果的准确性。

To study the mechanical properties of electro-hydraulic dredging grab in excavation process and changing trend of excavated materials, EDEM based discrete element simulation model of grab excavation is established with known structural parameters of the grab and material parameters, and experiments are conducted at different excavation depths. Comparison of theoretical calculation results and simulation results reveals that the excavation resistance of the two main stressed structures of the grab, i.e., bucket teeth and bottom plate, increases as the grab goes deeper, and the two parts show different changing trends in excavation resistance over time during simulation. The changing trends obtained from the simulation and theoretical calculations are basically the same, thus proving that the simulation results are accurate.