Modification of Discrete Element Contact Parameters of Coal Bulks Based on Rotary Transport Test

doi:10.12068/j.issn.1005-3026.2021.10.010

Abstract

Abstract: To obtain the accurate discrete element simulation results of scraper conveyors， the contact parameters of coal bulks were corrected by the response surface method based on the rotary transport test. The Plackett-Burman test was used to investigate the effect of contact parameters on the force and stacking angles， and it was found that the static friction coefficient of coal-steel and the friction coefficient of coal-coal have significant positive effects. According to the results of the climbing test， the Box-Behnken test was planned with force and stacking angle as the response value， and the quadratic regression polynomials between forces， stacking angles and significant terms were established respectively. The optimal parameters were obtained with the measured data as the target value and the results showed that the static friction coefficient of coal-steel is 0.401， the static friction coefficient of coal-coal is 0.333， and the rolling friction coefficient of coal-coal is 0.041. The accuracy of the parameters was verified by the rotary test under different transportation conditions， which provides a reference for the discrete element study of scraper conveyors.

Key words: discrete element method; coal bulk; contact parameters; Plackett-Burman test; response surface method

CLC Number:

TD528

LI Bo， WANG Zi-sheng， LIANG Chao， WANG Xue-wen. Modification of Discrete Element Contact Parameters of Coal Bulks Based on Rotary Transport Test[J]. Journal of Northeastern University(Natural Science), 2021, 42(10): 1435-1443.

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