生态茶园“土壤-绿肥根茬秸秆-开沟触土部件”离散元模型建立与验证  

Establishment and verification of discrete element model for soils,root stubble and straw of green manure and trenching components in ecological tea plantation

作　　者：陈龙彬 陈凌霄 郑书河[1,3] CHEN Longbin;CHEN Lingxiao;ZHENG Shuhe(College of Mechanical and Electrical Engineering,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350100,China;Fujian Agricultural Machinery Promotion Station,Fuzhou,Fujian 350001,China;Modern Agricultural Equipment Engineering Research Center of Fujian Universities,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China)

机构地区：[1]福建农林大学机电工程学院,福建福州350100 [2]福建省农业机械推广总站,福建福州350001 [3]福建农林大学现代农业装备福建省高校工程研究中心,福建福州350002

出　　处：《福建农林大学学报(自然科学版)》2025年第3期420-431,共12页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：福建省科技厅引导性项目(2022N0009);福建农林大学茶全产业链创新与服务体系建设项目(K1520005A05)。

摘　　要：【目的】获取生态茶园土壤与开沟触土部件相互作用的离散元仿真模型参数,建立生态茶园的“土壤-绿肥根茬秸秆-开沟触土部件”离散元仿真模型,为生态茶园触土部件离散元仿真研究提供依据。【方法】采用物理下落堆积、斜面滚动试验与离散元仿真联合方案,基于Hertz-Mindlin with Bonding接触模型,对土壤颗粒间及土壤-开沟触土部件材料(65 Mn钢)接触参数进行标定。以土壤下落堆积角、土壤颗粒斜面滚动距离为评价指标,以静摩擦系数、滚动摩擦系数和恢复系数为试验因素,应用Box-Behnken的响应面优化方法,确定土壤堆积角与土球斜面滚动距离的回归模型。【结果】模型优化处理后,土壤颗粒之间的静摩擦系数、滚动摩擦系数和恢复系数分别为1.017、0.089和0.222。土壤-开沟部件的静摩擦系数、滚动摩擦系数和恢复系数分别为0.279、0.104和0.487。仿真标定结果与物理试验的相对误差为0.68%和0.98%。基于标定参数建立生态茶园“土壤—绿肥根茬秸秆-开沟触土部件”离散元仿真模型,通过仿真试验与田间试验对比分析,开沟深度和开沟宽度的最大相对误差分别为8.15%和6.36%。【结论】标定优化后的参数与物理试验的相对误差小,建立的生态茶园“土壤-绿肥根茬秸秆-开沟触土部件”离散元仿真模型的可靠性与有效性较高。【Objective】A discrete element simulation model for the interaction between soil,root stubble and straw of green manure,and trenching component was established to provide reference for the discrete element simulation of soil contact components in ecological tea gardens.【Method】Based on the Hertz-Mindlin with Bonding model,a scheme combining physical falling-originated piling up,slope rolling test and discrete element simulation was adopted to calibrate the contact parameters between soil particles and trenching component material(65 Mn steel).A regression model between soil accumulation angle and inclined rolling distance of soil particles was established by Box-Behnken response surface optimization method with static friction coefficient,rolling friction coefficient and recovery coefficient as the experimental factors.【Result】After optimizion,the static friction coefficient,rolling friction coefficient and recovery coefficient between soil particles were 1.017,0.089 and 0.222,respectively,and those between soils and trenching components were 0.279,0.104 and 0.487,respectively.The relative errors for the simulation calibration results and physical tests were 0.68%and 0.98%.Based on the calibrated parameters,a discrete element simulation model concerning soil,root stubble and straw of green manure and trenching component was established for the ecological tea garden,and the maximum relative errors of trenching depth and width were achieved at 8.15%and 6.36%by comparative analysis between simulation test and field experiments.【Conclusion】The relative errors between the calibrated parameters and physical tests were small,and the established discrete element simulation model concerning the soil,root stubble and straw of green manure and trenching component for ecological tea garden had high reliability and effectiveness.

关 键 词：参数标定 离散元法 生态茶园 旋耕开沟 土壤 

分 类 号：S220.1[农业科学—农业机械化工程]