College of Engineering, Heilongjiang Bayi Agricultural University, Daqing, Heilongjiang, China.
PLoS One. 2024 Aug 29;19(8):e0303064. doi: 10.1371/journal.pone.0303064. eCollection 2024.
In view of the lack of accurate models for discrete element simulation in the current research and development process of forage harvesting and crushing machinery, the contact parameters were calibrated based on Hertz-Mindlin (no slip) contact model by EDEM simulation software with alfalfa stalk at primary florescence as the research object. Based on the angle of repose, the restitution coefficient, static friction coefficient, rolling friction coefficient of alfalfa stalks were determined through the Placket-Burman test, steepest ascent test and Box-Behnken test. The simulation test of the repose angle was carried out with the determined contact parameters. The results showed that the relative error between the simulated repose angle and the physical test repose angle was 0.48%, which indicated that the calibrated contact parameters could truly reflect the physical characteristics of alfalfa stalks at the primary florescence. It provided a reliable model and parameter calibration method for the discrete element simulation in the research and development process of forage machinery, and also provided a reference for the research and optimization design of forage harvesting, crushing and processing machinery.
鉴于目前饲料收获和粉碎机械的研发过程中离散元模拟缺乏精确模型，本研究以初花期紫花苜蓿秸秆为研究对象，利用 EDEM 仿真软件基于赫兹-明德尔（无滑移）接触模型对接触参数进行标定。基于休止角，利用 Placket-Burman 试验、最陡爬坡试验和 Box-Behnken 试验确定了紫花苜蓿秸秆的恢复系数、静摩擦系数和滚动摩擦系数。利用确定的接触参数对休止角进行仿真试验。结果表明，模拟休止角与物理试验休止角的相对误差为 0.48%，表明标定的接触参数能够真实反映初花期紫花苜蓿秸秆的物理特性。为饲料机械研发过程中的离散元模拟提供了可靠的模型和参数标定方法，也为饲料收获、粉碎加工机械的研究和优化设计提供了参考。
