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Zhao L.,China University of Mining and Technology | Zhao L.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | Zhao Y.,China University of Mining and Technology | Zhao Y.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | And 3 more authors.
2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011 - Proceedings | Year: 2011

Aiming at the problems of penetration and missing detection between particles with high speed in virtual system, a dynamic detection algorithm is presented which efficiency is advanced by the combination of multilevel detection and detection space division method in this paper. The algorithm has been applied in virtual sieving experiment system of discrete materiel and the results meet a good agreement with industrial experiment. It shows that dynamic collision detection algorithm can avoid the problems of penetration and missing detection between particles with high moving velocity and improve the precision of virtual sieving test. The algorithm is simple and with high efficiency which is suitable for simulation of complex virtual scene with large number of dynamic particles. © 2011 IEEE.


Zhao L.,China University of Mining and Technology | Zhao L.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | Zhao Y.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | Zhao Y.,China University of Mining and Technology | And 4 more authors.
Mining Science and Technology | Year: 2011

A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the longitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throwing index, and screen deck inclination angle are 3-3.5 mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs. © 2011 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Dong H.,China University of Mining and Technology | Liu C.,China University of Mining and Technology | Liu C.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | Zhao Y.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | And 3 more authors.
International Journal of Mining Science and Technology | Year: 2013

The screening of particles with different vibration modes was simulated by means of a 3D discrete element method (3D-DEM). The motion and penetration of the particles on the screen deck were analyzed for linear, circular and elliptical vibration of the screen. The results show that the travel velocity of the particles is the fastest, but the screening efficiency is the lowest, for the linear vibration mode. The circular motion resulted in the highest screening efficiency, but the lowest particle travel velocity. In the steady state the screening efficiency for each mode is seen to increase gradually along the longitudinal direction of the deck. The screening efficiency increment of the circular mode is the largest while the linear mode shows the smallest increment. The volume fraction of near-mesh size particles at the underside is larger than that of small size particles all along the screen deck. Linear screening mode has more near-mesh and small size particles on the first three deck sections, and fewer on the last two sections, compared to the circular or elliptical modes. © 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.


Liu C.,China University of Mining and Technology | Liu C.,Key Laboratory of Coal Processing and High Efficient Cleaning and Utilization | Wang H.,China University of Mining and Technology | Zhao Y.,China University of Mining and Technology | And 2 more authors.
International Journal of Mining Science and Technology | Year: 2013

A mathematical study of particle flow on a banana screen deck using the discrete element method (DEM) was presented in this paper. The motion characteristics and penetrating mechanisms of particles on the screen deck were studied. Effects of geometric parameters of screen deck on banana screening process were also investigated. The results show that when the values of inclination of discharge and increment of screen deck inclination are 10 and 5 respectively, the banana screening process get a good screening performance in the simulation. The relationship between screen deck length and screening efficiency was further confirmed. The conclusion that the screening efficiency will not significantly increase when the deck length L ≥ 430 mm (L/B ≥ 3.5) was obtained, which can provide theoretical basis for the optimization of banana screen. © 2013 Published by Elsevier B.V. on behalf of China University of Mining & Technology.

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