机构地区:[1]天津科技大学轻工科学与工程学院,天津300457
出 处:《沈阳农业大学学报》2025年第1期59-72,共14页Journal of Shenyang Agricultural University
基 金:国家重点研发计划项目(2022YFC2105503)。
摘 要:[目的]针对目前烟丝颗粒仿真中离散元接触参数缺乏、破碎模型空缺的问题,进行烟丝接触参数标定,构建烟丝破碎模型,并进行破碎参数标定。[方法]以烟丝为研究对象,构建烟丝离散元接触模型,结合Plackett-Burman试验设计和Box-Behnken试验设计确定烟丝各项物理参数,其中烟丝颗粒泊松比、烟丝间恢复系数、烟丝间静摩擦系数、烟丝间滚动摩擦系数、烟丝与设备恢复系数、烟丝与设备静摩擦系数、烟丝与设备动摩擦系数及烟丝剪切模量的最优值分别为0.35,0.35,0.49,0.03,0.35,0.44,0.12,5.75×10^(6)Pa;构建烟丝破碎模型,通过重球跌落试验标定破碎模型的主要参数,其中黏结半径0.216 mm、单位法向刚度4.62×10^(10)N·m^(-3)、单位切向刚度1.62×10^(10)N·m^(-3)、临界法向力5.10×10^(10)Pa、临界切向力1.89×10^(10)Pa,并通过单轴压缩试验进一步验证破碎参数的有效性。[结果]在烟丝离散元接触参数标定中,数值模拟与试验结果相对误差平均值为2.9%,烟丝离散元接触参数标定精确;在烟丝破碎模型的参数标定中,重球跌落的数值模拟与试验结果相对误差平均值为0.82%,单轴压缩的数值模拟与试验结果相对误差平均值为4.53%,烟丝破碎模型可靠。[结论]研究结果可为探究烟丝造碎提供有效模型参考。[Objective]In view of the lack of discrete element contact parameters and breakage model of tobacco in the particle simulation,the contact parameters of tobacco were calibrated,the breakage model of tobacco was constructed,and the breakage parameters were calibrated.[Methods]Adiscrete element contact model was constructed taking tobacco as the research object.PlackettBurman test design and Box-Behnken test design were combined to determine the physical parameters of tobacco.The optimal values of Poisson's ratio of tobacco,coefficient of recovery between tobacco,coefficient of static friction between tobacco,coefficient of rolling friction between tobacco,coefficient of recovery between tobacco and equipment,coefficient of static friction between tobacco and equipment,coefficient of kinetic friction between tobacco and equipment and the shear modulus of the tobacco were 0.35,0.35,0.49,0.03,0.35,0.44,0.12,5.75×10^(6)Pa respectively.The breakage model of tobacco was constructed,and the main parameters were calibrated using heavy ball drop experiments,including a bond radius of 0.216 mm,a unit normal stiffness of 4.62×10^(10)N·m^(-3),a unit tangential stiffness of 1.62×10^(10)N·m^(-3),a critical normal force of 5.10×10^(10)Pa and critical tangential force 1.89×10^(10)Pa.The validity of the breakage parameters was further verified using uniaxial compression test.[Results]In the calibration of discrete element contact parameters of tobacco,the average relative error between numerical simulation and test results was 2.9%,and the calibration results o discrete element contact parameters of tobacco were accurate;in the calibration of breakage model parameters of tobacco,the average relative error between numerical simulation and test results of heavy ball drop was 0.82%,and the average relative error between numerical simulation and test results of uniaxial compression was 4.53%,and the tobacco breakage model was reliable.[Conclusion]The research can provide an effective model reference for the exploration of tobac
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