分层防寒土与接触式清土机具相互作用的离散元仿真参数标定  

Calibration of discrete element simulation parameters for interaction between layered cold soil and contact soil clearing tools

作　　者：杨启志[1] 赫明胜 施雷 朱梦岚 李章彦 何文兵 YANG Qizhi;HE Mingsheng;SHI Lei;ZHU Menglan;LI Zhangyan;HE Wenbing(School of Agricultural Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学农业工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2023年第1期52-61,共10页Journal of Jiangsu University：Natural Science Edition

基　　金：国家科技重大专项子课题(2019YFD1002502,2019YFD1002505);国家自然科学基金资助项目(51675239);宁夏重点研发计划重大项目(2018BBF02020);江苏省高校自然科学基金重点资助项目(19KJA430018);镇江市重点研发计划项目(现代农业)(NY2019015)。

摘　　要：为了获取西北地区不同土层的防寒土以及与接触部件(Q235钢)的离散元仿真参数,构建准确的EDEM仿真模型,将防寒土分为3层,选用Hertz-Mindlin(no slip)作为接触模型,采用堆积角试验和直剪试验,并结合Plackett-Burman方法确定显著因素、最陡爬坡试验缩小范围、Box-Behnken响应面分析法确定回归方程,逐步确定不同层土壤颗粒间的弹性恢复系数、滚动摩擦因数和静摩擦因数.通过土壤滑落试验和二因素通用旋转中心组合仿真试验获得不同土层土壤颗粒与刮板之间的弹性恢复系数、静摩擦因数和滚动摩擦因数的值.为验证离散元参数标定的准确性,对比分析田间试验和仿真试验后的土垄高度,其相对误差为5.78%,在可接受的范围内,验证了分层防寒土土壤标定的仿真参数以及研究方法的准确性.To obtain the cold soil of different soil layers in northwest China and the discrete element simulation parameters with contact components(Q235 steel), an accurate EDEM simulation model was constructed.The cold soil was divided into three layers, and Hertz-Mindlin(no slip) was used as contact model. The stacking angle test and straight shear test were used, and the significant factors were determined by the Packett-Burman method. The narrowing range was determined by the steepest climbing test, and the Box-Behnken response surface analysis method was used to determine the regression equation. The elastic recovery coefficient, the rolling friction factor and the static friction factor between different layers of soil particles were determined gradually.Through soil slip test and two-factor universal rotation center combination simulation test, the values of elastic recovery coefficient, static friction factor and rolling friction factor between soil particles and scrapers of different soil layers were obtained. The results show that the relative error is 5.78%, and the simulation parameters and research methods of layered cold soil calibration are verified.

关 键 词：接触式清土机 分层防寒土 离散元法 参数标定 堆积角试验 直剪试验 

分 类 号：S152.9[农业科学—土壤学] S22[农业科学—农业基础科学]