摘要
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。
The issue on the nonlinear characteristics of particle screening processes is an important research subject in the field of granular discrete model. Based on the discrete element method （DEM）, four-level particle screening models in two and three dimensions were established. The simulation tests of four-level particle screening processes were carried out. By investigating the vibration sieve surface of nonlinear motion velocity and particle trajectory, the nonlinear motion law was addressed. The percentages of small particle size changed across time with obvious nonlinear characteristics. And small size particles had high velocity along sieve permeation. We found that screening efficiency was related not only with the particle size but also with the shaker motion characteristics. All the nonlinear motion belonged to the chaotic motion. The models in this study can lay the theoretical foundation for further investigation of the soil particles screening mechanism and optimization of screening machinery for particle nonlinear motion.
出处
《土壤通报》
CAS
CSCD
北大核心
2013年第6期1369-1373,共5页
Chinese Journal of Soil Science
基金
江苏省自然科学基金(BK2010457)
国家自然科学基金(51275250)资助
关键词
离散元
颗粒运动
筛分
非线性运动
Discrete element method
Particle motion
Screening
Nonlinear motion
