变重力场中散体颗粒堆的安息角及接触力分布

发布时间：2018-03-13 23:28

本文选题：颗粒堆　切入点：安息角　出处：《北京航空航天大学学报》2015年06期 　论文类型：期刊论文

【摘要】：为研究重力与散体颗粒堆安息角的关系,针对颗粒系统的随机性和离散性特点,通过三维离散单元法建立颗粒的运动模型,对颗粒在不同重力场中的堆积过程进行了模拟,得出了颗粒堆的安息角及接触力概率分布.结果表明:颗粒堆内接触力构成的力链呈非规则网络状,其中,接触力近似对数正态分布,约65%接触力低于平均值;接触点中约70%处于临界滑移,其余接触点切向力与法向力的比值为均匀分布;不同重力场中颗粒堆接触力的分布规律具有相似性,即接触力相对重力无量纲化之后,其分布函数高度相符;颗粒堆的微观结构具有随机性差异,但是安息角不受重力大小的影响.
[Abstract]:In order to study the relationship between gravity and rest angle of bulk particles, according to the characteristics of randomness and discreteness of particle system, the motion model of particles is established by means of three-dimensional discrete element method, and the stacking process of particles in different gravity fields is simulated. The probability distribution of rest angle and contact force is obtained. The results show that the force chain formed by contact force in granular reactor is irregular network, in which the contact force is approximately logarithmic normal distribution, about 65% contact force is lower than the average value. About 70% of the contact points are in critical slip, and the ratio of tangential force to normal force at the other contact points is uniformly distributed, and the distribution of contact forces in different gravity fields is similar, that is, after the contact force is relatively gravimetric, the distribution of contact force is similar. The distribution function is highly consistent, and the microstructure of the granular reactor is random, but the rest angle is not affected by the magnitude of gravity.
【作者单位】：中南大学机电工程学院;
【基金】：国家自然科学基金(51275531,51374241) 湖南省研究生科研创新项目(CX2014B059)
【分类号】：P172

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