School of Artificial Intelligence, Beijing Technology and Business University, Beijing, 100048, China.
Key Laboratory of Healthy Freshwater Aquaculture, Zhejiang Institute of Freshwater Fisheries, Huzhou, 313001, China.
Sci Rep. 2023 Jun 7;13(1):9246. doi: 10.1038/s41598-023-36482-w.
In order to improve the accuracy of the parameters needed in the discrete element method (DEM) simulation process of wet-sticky feed raw materials, the JKR contact model in DEM was used to calibrate and verify the physical parameters of wet-sticky feed raw materials. Firstly, the parameters that have a significant effect on the angle of repose were screened using a Plackett-Burman design, and the screened parameters were: MM rolling friction coefficient, MM static friction coefficient, and JKR surface energy. Then, the three screened parameters were selected as the influencing factors and the accumulation angle of repose was selected as evaluating indicator; thus, the performance optimization experiments were carried out with the quadratic orthogonal rotation design. Taking the experimentally measured angle of repose value of 54.25°as the target value, the significance parameters were optimized, and the optimal combination was obtained : MM rolling friction factor was 0.21, MM static friction factor was 0.51, and JKR surface energy was 0.65. Finally, the angle of repose and SPP tests were compared under the calibrated parameters. The results showed that the relative error of experimental and simulated tests in angle of repose was 0.57%, and the compression displacement and compression ratio of the experimental and simulated tests in SPP were 1.01% and 0.95%, respectively, which improved the reliability of the simulated results. The research findings provide a reference basis for simulation study and optimal design of related equipment for feed raw materials.
为了提高离散元法（DEM）模拟湿粘饲料原料过程中所需参数的准确性，使用 DEM 中的 JKR 接触模型对湿粘饲料原料的物理参数进行校准和验证。首先，使用 Plackett-Burman 设计筛选出对休止角有显著影响的参数，筛选出的参数为：MM 滚动摩擦系数、MM 静摩擦系数和 JKR 表面能。然后，选择三个筛选出的参数作为影响因素，以堆积休止角作为评价指标，进行二次正交旋转设计的性能优化实验。以实验测量的休止角值 54.25°为目标值，对显著性参数进行优化，得到最优组合：MM 滚动摩擦系数为 0.21，MM 静摩擦系数为 0.51，JKR 表面能为 0.65。最后，在校准参数下比较了休止角和 SPP 测试。结果表明，休止角实验和模拟测试的相对误差为 0.57%，SPP 实验和模拟测试的压缩位移和压缩比分别为 1.01%和 0.95%，提高了模拟结果的可靠性。研究结果为饲料原料相关设备的模拟研究和优化设计提供了参考依据。
