Abstract:Existing development using virtual simulation technology for the fodder rape crop harvest technology and machine lacks accurate model parameters, highlighting a need for the calibration. Taking the rape crop stalk at the early pod stage as the object, the parameters calibration was carried out by using EDEM software. The basic attribute of the stem, including the repose angle, were measured. The results indicated that the average stalk diameter was 20.4mm, the density was 809kg/m3, and the average elastic modulus, shear modulus and Poisson’s ratio were 115.73MPa, 47.04MPa and 0.23, respectively. Furthermore, the Hertz-Mindlin contact mode was employed to conduct a cylindrical lifting simulation test, in which the contact mode used different parameter sets according to the test design rule of two-level factor test, steepest climbing test, and response surface analysis. The results showed that the recovery coefficient of the collision of particles of crop stem, the recovery coefficient of the collision between steel and particles of crop stem and the rolling friction coefficient between steel and particles of crop stem had slight effect on the angle of repose, whose values were determined as 0.60, 0.60 and 0.10, respectively. The static friction coefficient of particles of crop stem, the coefficient of rolling friction of particles of crop stem, and the static friction coefficient between steel and particles of crop stem were identified as 0.36, 0.03, and 0.23, respectively. The error rate of the value of repose angle between the simulated by using EDEM with the calibrated parameters and the real measured value was 1.83%. The research provided the basic parameters for the simulation of the fodder rape crop mechanized harvest.