华南农业大学学报2025，Vol.46Issue(3)：407-418,12.DOI:10.7671/j.issn.1001-411X.202403013
基于离散元的'鲁丽'苹果仿真接触参数标定
Calibration of contact parameters of'Luli'apple for simulation based on discrete element
摘要
Abstract
[Objective]The aim of this study was to construct a discrete element model of apples and precisely calibrate the corresponding contact parameters.[Method]The discrete element model of'Luli'apples was constructed using a spherical particle bonding method,and the optimal particle radius was identified through comparative analysis.A combined method of experimental testing and simulation was adopted to determine the contact parameters,such as the restitution coefficient and friction coefficients.Analysis of variance(ANOVA)was employed to evaluate the effects of collision zone,fruit mass,and foam type on the contact parameters.Various test conditions were simulated to obtain data,which were then used to fit parameter equations.The parameter equations were subsequently verified.[Result]The collision zone had no significant effect on the coefficient of restitution.A discrete element model with a 2 mm particle radius was established.The calibrated restitution coefficients,static and rolling friction coefficients between the apple particle models and the super-high and high-density foams were 0.61 and 0.47,0.46 and 0.61,0.016 6 and 0.028 8,respectively.The corresponding values for interactions between apple particle models were 0.65,0.42 and 0.032 0 respectively.The effectiveness of the calibrated parameters was verified through a bottomless cylinder lifting experiment.[Conclusion]The discrete element model of apple is successfully constructed.This study can provide a theoretical basis for the design and optimization of close-range catching mechanisms in apple vibration harvesting or post-harvest processing devices.关键词
力学/离散元法/苹果颗粒模型/接触参数/虚拟标定Key words
Mechanics/Discrete element method/Apple particle model/Contact parameter/Virtual calibration分类
农业科学引用本文复制引用
付函,吴志治,段洁利,余绍政,刘烽,郑海乐..基于离散元的'鲁丽'苹果仿真接触参数标定[J].华南农业大学学报,2025,46(3):407-418,12.基金项目
国家自然科学基金(51905179) （51905179）
广东省基础与应用基础研究基金(2024A1515030158) （2024A1515030158）
