摘要
转运煤块的矿山机械主要作用对象为煤散料,而散料的仿真接触参数很难通过直接测量获取,为了增加仿真的可靠性及准确性,文中采用响应面研究方法对煤块离散元接触参数进行研究;建立了3种以煤块实际形状为基础的非球形颗粒;利用离散元软件EDEM对煤块进行堆积与滑落2种过程分别进行仿真,并将仿真与实际物理实验对比。以煤的堆积角和煤与钢的滑动摩擦角为响应值,并用实验测量得到的煤块堆积角、煤与钢的滑动摩擦角为目标,采用Design-Expert软件进行二次多项式回归分析,得到最优的离散元仿真参数值:煤块之间静摩擦系数为0.311、动摩擦系数为0.054、恢复系数为0.238;煤块与钢板之间的静摩擦系数为0.238、动摩擦系数为0.037、恢复系数为0.119。
Mining machinery for transferring coal block is primarily designed for handling bulk coal.However,obtaining accurate simulated contact parameters for bulk coal through direct measurement is challenging.To enhance the reliability and accuracy of simulations,the contact parameters of coal discrete elements were investigated using the response surface method.Three types of non-spherical particles,based on the actual shape of coal blocks,were established.The discrete element software EDEM was used to simulate two key processes:coal accumulation and coal sliding.The simulation results were then compared with experimental outcomes.With the accumulation angle of coal and the sliding friction angle between coal and steel serving as response values,and the experimentally measured accumulation angle of coal blocks and sliding friction angle between coal and steel as targets,quadratic polynomial regression analysis was conducted using Design-Expert software.This analysis yielded the optimal discrete element simulation parameter values as follows:for coal blocks,static friction coefficient is 0.311,dynamic friction coefficient is 0.054,and restitution coefficient is 0.238;for coal blocks and steel plates:static friction coefficient is 0.238,dynamic friction coefficient is 0.037 and restitution coefficient is 0.119.
作者
余文棋
王爱红
高有山
蔺科维
孙浩然
Yu Wenqi;Wang Aihong;Gao Youshan;Lin Kewei;Sun Haoran
出处
《起重运输机械》
2025年第14期40-45,共6页
Hoisting and Conveying Machinery
关键词
离散元
响应面法
二次多项式回归分析
仿真
discrete element
response surface method
quadratic polynomial regression analysis
simulation
