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颗粒在筛分过程中的非线性特征问题是散体领域的重要研究课题。基于离散单元法DEM,建立了土壤颗粒四级筛分二维及三维模型,进行了土壤颗粒四级筛分过程的模拟试验,研究振动筛面颗粒非线性运动速度及运动轨迹分析其非线性运动规律。研究表明:小于大孔径的颗粒百分含量呈现较为明显的非线性特征;小粒径颗粒在透筛方向速度较大,透筛效率不仅与粒径大小有关同时也与振动筛运动特性有关,非线性运动呈现混沌运动。以上模型的建立及研究,为进一步探究土壤颗粒筛分机理和优化筛分机械探寻颗粒非线性运动奠定理论基础。
Nonlinear characteristics of particles in the screening process is an important issue in the field of bulk materials. Based on the discrete element method (DEM), two-dimensional and three-dimensional sieve models of soil particles were established. The four-step sieving process of soil particles was simulated. The nonlinear motion of particles on the vibrating sieve surface was analyzed. law. The results show that the percentage of particles smaller than the macropore size is more obvious than that of the macropore. The particle size of the small particle size is larger in the direction of the sieve. The efficiency of the sieve is not only related to the particle size but also to the movement characteristics of the vibrating screen. Linear motion presents chaotic motion. The establishment and research of the above models lay a theoretical foundation for further exploration of the mechanism of soil particle sifting and optimization of sifting machinery to explore the particle non-linear movement.