Sensitivity analysis and optimization design of shearer's spiral drum based on discrete element method

Li Minghao; Niu Hao; Fan Jiayi; Zhao Lijuan

doi:10.16186/j.cnki.1673-9787.2022100035

Abstract：Objectives In order to optimize the coal loading performance and production efficiency of shearer working in complex coal seam,the floor climbing shearer's spiral drum was studied based on the discrete element method,sensitivity analysis theory,and structural evolution algorithm.Methods The physical model of the spiral drum and the gangue coal rock was jointly established.The Hertz model was used to construct the coupling model between roller and gangue coal rock.Based on the physical characteristics pa-rameters and the movement parameters of the drum and the gangue coal rock,the coal-loading performance of the shearer was simulated and analyzed,and the loading rate of the spiral drum of the climbing floor shearer was obtained by regional statistics.A discrete element coupling model for different geometric param-eters and motion parameters of the drum was established.The data obtained from the simulation of discrete element coupling model was fitted,and the multi-objective design function of spiral drum was obtained based on the multi-objective optimization design weighting algorithm.Based on the stress-strength interfer-ence theory,the state evaluation function of the coal loading performance of the shearer screw drum was constructed.Combined with the sensitivity design theory,the influence law of screw drum design variables on the coal loading performance of shearer was obtained.Using structural evolution algorithm,the optimal solution of shearer spiral drum design variables was obtained.Results The results showed that the coal-loading rate of the optimized spiral drum was increased from 61.35%to 64.17%,the optimal design of spi-ral drum was achieved.The sensitivity of the design variable was reduced and the coal-loading performance of the spiral drum was improved,it showed that the overall performance of the optimized drum loading rate tended to be stable.Conclusions Combining discrete element technology,sensitivity design theory and struc-tural evolution algorithm,an effective technical route for designing spiral drum with efficient cutting perfor-mance under the condition of occurrence of coal seam containing gangue was provided.