基于离散元的 鲁丽 苹果仿真接触参数标定

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中图分类号：S121；TP391.9；TB12 文献标志码：A 文章编号：1001-411X（2025）03-0407-12

Calibration of contact parameters of ‘Luli’ apple for simulation based on discrete element

FUHan1²，WU Zhizhi¹，DUANJieli1²，YU Shaozheng1，LIUFeng1，ZHENGHailel （1 College ofEngineering，South China Agricultural University， Guangzhou ， China; 2 Guangdong Provincial KeyLaboratory for Agricultural Artificial Intelligence， Guangzhou 51o642， China）

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 coeffcient and friction coefcients. Analysis of variance （ANOVA） was employed to evaluate the effects ofcolision zone，fruit massand 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 collsion zone had no significant efect on the coefficient of restitution.A discrete element model with a 2 m m particleradiuswasestablished.Thecalibrated restitution coefficients， static and rolling friction coefficients between the apple particle models and the superhigh and high-density foams were 0.61 and 0.47， 0.46 and 0.61， 0.0166 and 0.0288， 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.

Key words： Mechanics; Discrete element method; Apple particle model; Contact parameter; Virtual calibration

在果实振动收获过程中，在承接阶段的相互碰撞是果实损伤的主要来源之一。（剩余17203字）