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基于堆积角的烟丝离散元仿真参数标定

Calibration of simulation parameters using discrete element method for cut tobacco by measuring repose angle

  • 摘要: 为确定离散元模拟过程中烟丝仿真参数的合理取值,通过物理实验测定了烟丝的物理堆积角,采用Plackett-Burman实验、最陡爬坡实验与Box-Behnken实验确定了烟丝离散元仿真参数的最优取值,并使用最优取值进行烟丝虚拟堆积实验。结果表明:①A牌号卷烟烟丝的物理堆积角为28.59°。②对A牌号卷烟烟丝虚拟堆积角影响显著的参数为烟丝-烟丝静摩擦系数(X4)、烟丝-烟丝滚动摩擦系数(X5)与烟丝-不锈钢静摩擦系数(X7),3个显著参数的最优取值分别为0.589、0.123和0.422。③采用最优参数组合进行仿真实验,测得A、B、C牌号卷烟烟丝虚拟堆积角与物理堆积角的相对误差均小于5%,虚拟堆积角的变异系数均小于1%。标定方法的重复性及仿真参数的准确性均较好。

     

    Abstract: To determine the appropriate values of cut tobacco parameters for discrete element simulation, the physical repose angle of cut tobacco was measured by physical tests. The optimal values of cut tobacco simulation parameters determined by the Plackett-Burman test, the steepest ascent search test and the Box-Behnken test were used in a virtual cut tobacco stacking experiment. The results showed that: 1) The physical repose angle of brand A cut tobacco was 28.59°. 2) The parameters that significantly affected the repose angle of brand A cut tobacco were the coefficient (X4) of tobacco-tobacco static friction, the coefficient (X5) of tobacco-tobacco rolling friction, the coefficient (X7) of tobacco-stainless steel static friction, and the optimum values of these three coefficients were 0.589, 0.123 and 0.422, respectively. 3) The simulation experiment was carried out using the optimal combination of the parameters. The relative error between the virtual and physical repose angle of brands A, B and C was less than 5%, and the coefficient of variation of the virtual repose angle was less than 1%. The calibration method had good repeatability and the simulation parameters were considered to be accurate.

     

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