摘要
针对畜禽粪肥含水率差异大等因素导致其离散元仿真参数标定方法通用性和实用性不强等问题,以堆积角为响应值对不同含水率的羊粪进行试验研究。通过圆筒提升法建立了含水率-堆积角模型,模型相关系数0.9999。基于羊粪粒度分布以Hertz-Mindlin with JKR为粘结模型建立4种不同粒径的EDEM颗粒模型;通过Plackett-Burman试验、爬坡试验和Box-Behnken试验从10项参数中筛选出JKR表面能、颗粒间滚动摩擦因数和静摩擦因数3项显著性参数,并建立了堆积角-离散元参数模型,模型P值小于0.0001,相对误差小于等于2.42%;基于含水率-堆积角模型和堆积角-离散元参数模型推导构建了含水率-离散元参数模型,以抽板法进行工程性验证,相对误差小于等于5.37%。表明通过含水率即可直接预测羊粪离散元参数,研究为施肥机械-羊粪仿真中离散元参数确定提供了通用、可靠的方法。
To solve the problem that the calibration method of discrete element simulation parameters was not universal and practical due to the large difference in moisture content of livestock and poultry manure,the discrete element parameters of goat manure with different moisture contents were studied with the resting angle as the response value.The moisture content-resting angle model was established with the cylinder lifting method,and the correlation coefficient was 0.9999.Based on the particle size distribution of goat manure,EDEM particle models of four kinds of particle sizes were established,and Hertz-Mindlin with JKR was used as the bonding model.Three significant parameters of JKR surface energy,rolling friction coefficient,and static friction coefficient between particles were selected from ten parameters by the Plackett-Burman test,climbing test,and Box-Behnken test.Then the resting angle-discrete element parameters model was established.The P-value of the model was less than 0.0001,and the relative error was less than or equal to 2.42%.The moisture content-discrete element parameters model was constructed based on the moisture content-resting angle model and the resting angle-discrete element parameters model.The engineering verification test with the side plate lifting method was conducted,and the relative error was less than or equal to 5.37%.The results showed that the moisture content can be used to predict the discrete element parameters of goat manure directly,and the method had fast prediction speed with high accuracy at the same time.The research results provide a general and reliable method for determining discrete element parameters of goat manure.
作者
朱新华
伏胜康
李旭东
魏玉强
赵伟
ZHU Xinhua;FU Shengkang;LI Xudong;WEI Yuqiang;ZHAO Wei(College of Mechanical and Electronic Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;Sichuan Aerospace Vocational College,Chengdu 610100,China)
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2022年第8期34-41,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
陕西省农业协同创新与推广联盟重大科技项目(LMZD201703)
陕西省重点研发计划项目(2022NY-204、2019ZDLNY01-05-02)
关键词
羊粪
含水率
离散元
EDEM
标定
堆积角
goat manure
moisture content
discrete element
EDEM
calibration
resting angle
作者简介
朱新华(1967—),男,教授,博士生导师,主要从事西部旱区农业机械技术与装备研究,E-mail:zxh920@nwsuaf.edu.cn
