关键词: 元胡, 离散元模型, 参数标定, 休止角, 收获机械

Abstract: In order to improve the accuracy of the discrete element simulation parameters used in the machinereceived element, the discrete element parameters of the Rhizoma corydalis were calibrated by combining the physical test with the simulation test. Firstly, the range of basic physical property parameters of Rhizoma corydalis was determined by physical tests. Secondly, the significance test of the angle of repose was carried out according to the parameter range determined by the physical test. The order of the influence on the angle of repose of the Rhizoma corydalis was as follows: the coefficient of rolling friction between the Rhizoma corydalis, the coefficient of rolling friction between the Rhizoma corydalis and the steel plate, the coefficient of collision recovery between the Rhizoma corydalis. And according to the parameter range of physical test, the significance test of angle of repose was carried out, and the significant parameters that had an effect on the characteristic parameters were determined as follows: the rolling friction coefficient between Rhizoma corydalis and Rhizoma corydalis, the rolling friction coefficient between the Rhizoma corydalis and the steel plate, and the collision recovery coefficient between Rhizoma corydalis and Rhizoma corydalis. Again through the steepest uphill test narrowing the scope of significant parameter selection, and the angle of repose and significant factors based on response surface tests the optimal quadratic regression equation, then aiming at physical test rest angle to obtain the best parameter combination: Rhizoma corydalis rolling friction coefficient between 0.08, Rhizoma corydalis, and steel rolling friction coefficient between 0.32, Rhizoma corydalis collision between recovery coefficient of 0.49. At last, the simulation test was carried out under the calibrated model parameters and compared with the stack test, and no significant difference was found between the angle of repose and the contour of the pile, which showed that the optimal parameter combination  could be used as the discrete element simulation model parameters in the process of Rhizoma corydalis machine harvesting.

Key words: rhizoma corydalis, DEM, parameter calibration, angle of repose, harvesting machinery