摘要
Existing discrete element method-based simulation analysis of Panax notoginseng root soil separation still has the challenge to get the accurate and reliable basic parameters,which are necessary for discrete element simulation.In this paper,the P.notoginseng roots suitable for harvesting period were taken as the experimental object.Then using 3D scanning reverse modeling technology and EDEM software to establish the discrete element model of P.notoginseng,based on which,the physical and virtual tests were carried out to calibrate the simulation parameters.First,the basic physical parameters(density,triaxial geometric size,moisture content,shear modulus,and elastic modulus)and contact coefficients(static friction coefficient,rolling friction coefficient,and crash recovery coefficient between P.notoginseng roots and 65Mn steel)were measured by physical tests.Furthermore,treating the contact coefficients of P.notoginseng roots as the influence factor,the steepest uphill test,and four factors combing five levels of rotational virtual simulation are conducted.The measured relative error accumulation angle and simulation accumulation angle are set as the performance indices.The results show that the static friction coefficient,rolling friction coefficient,crash recovery coefficient,and surface energy coefficient of P.notoginseng roots are 0.55,0.35,0.16,and 19.5 J/m2,respectively.Using calibration results as parameters of the vibration separation simulation test of P.notoginseng soil,the Box-Behnken vibration separation simulation tests were carried out,in which the vibration frequency,inclination angle,and vibration amplitude of separation device as factors,screening rate and damage rate of P.notoginseng soil complex are regarded as indices.The results show that the optimal operating parameters of the separation device are the vibration frequency of 10 Hz,the inclination angle of 5°,and the amplitude of 6 cm.Based on the optimal operation parameters,the discrete element simulation experiment and field experiment of P.notoginseng roots soil separation are also performed to compare the soil three-dimensional trajectory space coordinates of P.notoginseng roots.From the results,three axis coordinate error is less than 15%.This proves that the calibration results are reliable.It can also provide the theoretical basis and technical support for the further study of the P.notoginseng root soil separation platform.
基金
supported by National Key R&D Program of China(Grant No.2022YFD2002004),Yunnan Fundamental Research Projects(Grant No.202401CF070144)
“Xingdian Talent Support Program”Youth Talent Project of Yunnan Province(Grant No.KKXX202423055).
作者简介
Kaiting Xie,PhD,research interest:intelligent agricultural machinery equipment,Email:xkt@stu.kust.edu.cn;Fa’an Wang,PhD,research interest:intelligent agricultural equipment design and manufacturing,Email:wfa@kust.edu.cn;Xiaolan Yu,master,research interest:intelligent agricultural machinery equipment,Email:2577760557@qq.com;Chenglin Wang,PhD,research interest:intelligent agricultural machinery equipment,Email:wangchenglin055@163.com;Shifei Jiang,PhD,research interest:intelligent agricultural machinery equipment,Email:20212203008@stu.kust.edu.cn;Corresponding author:Zhaoguo Zhang,Professor,PhD Supervisor,research interest:intelligent agricultural equipment design and manufacturing.Faculty of Modern Agricultural Engineering,Kunming University of Science and Technology,No.727,Jingming South Road,Chenggong District 650500,China.Tel:+86-15911701001,Email:zzg@kust.edu.cn.
