苹果颗粒离散元接触参数标定与仿真试验  

Calibrating and simulating contact parameters of the discrete element for apple particles

作　　者：张宏建[1] 韩欣 杨化伟 陈修波 赵光泽 孙经伟 孙林林[1] 王金星[1,3] ZHANG Hongjian;HAN Xin;YANG Huawei;CHEN Xiubo;ZHAO Guangze;SUN Jingwei;SUN Linlin;WANG Jinxing(College of Mechanical and Electronic Engineering,Shandong Agricultural University,Tai'an 271018,China;Shandong Academy of Agricultural Machinery Sciences,Ji’nan 252100,China;Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment,Tai’an 271018,China)

机构地区：[1]山东农业大学机械与电子工程学院,泰安271018 [2]山东省农业机械科学研究院,济南252100 [3]山东省园艺机械与装备重点实验室,泰安271018

出　　处：《农业工程学报》2024年第12期66-76,共11页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家苹果产业技术体系项目(CARS-27);山东省重点研发计划项目(2022CXGC020701、2022CXGC020706)。

摘　　要：为精准确定红富士、花牛和黄元帅苹果的接触参数,该研究基于离散元法对3种苹果颗粒的仿真模型进行接触参数标定试验。首先,创建3种苹果的离散元填充模型,并通过电子秤、万能试验机等试验设备,确定其本征参数。其次,通过碰撞弹跳试验、斜面滑移试验和斜面滚动试验,得到红富士、花牛和黄元帅苹果与亚克力板的碰撞恢复系数分别为0.473、0.432和0.466;与亚克力板的静摩擦系数分别为0.435、0.536和0.519;与亚克力板的滚动摩擦系数分别为0.007 7、0.013 8和0.008 8。最后,通过堆积角试验、最陡爬坡试验确定二次回归正交旋转组合试验,得到红富士、花牛和黄元帅同种苹果间的碰撞恢复系数分别为0.487、0.348和0.469;静摩擦系数分别为0.584、0.869和0.644;滚动摩擦系数分别为0.084、0.096和0.093。试验结果表明,红富士、花牛和黄元帅苹果仿真试验与物理试验的休止角相对误差分别为5.95%、6.55%、8.67%。研究结果可为苹果物理特性和低损采收技术研究提供理论依据和模型支撑。Apples are one of the most important fruits in China,due to their high nutritional value and storage resistance.The apple industry has been an important pillar of agricultural industry.Mechanical harvesting is also constantly improving in agricultural machinery.However,there are some complex forces among apples and harvesting equipment in the process of mechanical harvesting,even damage to apples.Some of the forces cannot be directly measured using physical experiments.While traditional experiments are required the preliminary verification,leading to the time-consuming and labor-intensive.Discrete element simulation can be expected to evaluate the apple damage.In this article,a series of calibration experiments were conducted on the contact parameter using via the simulation models using the discrete element method.Red Fuji,Hua Niu,and Golden Delicious apple particles were taken as the research objects.A contour map of apple was drawn using SolidWorks,and then imported into EDEM platform.A discrete element model of the apple was established with a smoothness of 3 and a minimum spherical radius of 3 mm.The physical parameters of the apple were then calibrated using drainage and compression tests.The density of the Red Fuji apple was 923 kg/m3,the Poisson's ratio was 0.33,the elastic modulus was 2.1 MPa,and the shear modulus was 1.4 MPa;The density of Hua Niu apples was 924 kg/m3,Poisson's ratio was 0.34,elastic modulus was 2.23 MPa,and shear modulus was 1.49 MPa;Golden Delicious apple density was 871 kg/m3,Poisson's ratio was 0.37,elastic modulus was 3.16 MPa,and shear modulus was 2.09 MPa.Furthermore,the contact parameters between apples and acrylic plates were calibrated using collision bounce,inclined sliding,and a combination of bench and simulation tests.The collision recovery coefficient between Red Fuji apples and acrylic plates was 0.432,the static friction coefficient was 0.536,and the dynamic friction coefficient was 0.0138;The collision recovery coefficient between Hua Niu Apple and acrylic board was 0.

关 键 词：离散元 模型 苹果 接触参数 标定与试验 堆积角 

分 类 号：S225[农业科学—农业机械化工程]