Simulation Parameter Calibration and Test of Typical Pear Varieties Based on Discrete Element Method

To improve the accuracy of discrete element simulation parameters for mechanized picking and collection pears, study calibrated pears by method combining a physical experiment simulation. Based on intrinsic four kinds (Snow Crisp Huangguan Qiuyue pears), their models were constructed Hertz-Mindlin with bonding model. The between contact material (PVC, EVA foam material) methods free fall collision, inclined sliding rolling, respectively. experiments pear accumulation angle carried out. It was obtained to process image Matrix Laboratory software. In order determine optimal value interval influencing factors angle, steepest ascent Considering coefficient collision recovery, static friction rolling five-level designed each factor orthogonal rotation combination. regression model error measured simulated established, influence three analyzed. results showed that have significant effects angle. Therefore, minimum according constraint condition, obtained. verification out bottomless barrel lifting. relative 1.42%, 1.68%, 2.19% 1.83%, respectively, which indicated reliable. research can provide basis design optimization harvesting machinery pears.