木薯种茎精密播种过程中机械碰撞损伤有限元分析  

Finite element analysis of mechanical collision damage during precision seeding of cassava seed stems

作　　者：陈林涛 蓝莹 窦文淼 刘兆祥 马旭[4] 陈睿 CHEN Lintao;LAN Ying;DOU Wenmiao;LIU Zhaoxiang;MA Xu;CHEN Rui(Vocational and Technical Teacher Training College,Guangxi Normal University,Guilin 541001,China;School of Chemistry and Pharmacy,Guangxi Normal University,Guilin 541001,China;School of Electronic Engineering,Guilin Institute of Information Science and Technology,Guilin 541004,China;College of Engineering,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]广西师范大学职业技术师范学院,广西桂林541001 [2]广西师范大学化学与药学学院,广西桂林541001 [3]桂林信息科技学院电子工程学院,广西桂林541004 [4]华南农业大学工程学院,广东广州510642

出　　处：《华南农业大学学报》2024年第3期427-436,共10页Journal of South China Agricultural University

基　　金：桂林市重大专项计划(20220102-3);桂林市重点研发计划(20210208-2);广西重点研发计划(2021AB38023);桂林市创新平台和人才计划项目(20210217-7);广西自然科学基金(2018GXNSFAA050026)。

摘　　要：【目的】明确木薯种茎在播种过程中的碰撞损伤机制,寻求较小损伤的播种方式。【方法】利用三维扫描技术逆向建立木薯种茎的三维模型,通过基于Hyper Mesh和LS-DYNA的种茎碰撞有限元分析,研究播种性能的主要影响因素(跌落高度、振动板安装倾斜角度及振动板振动频率)下种茎碰撞损伤过程,明确不同试验因素水平下种茎种芽−播种部件斜面接触等效应力、种芽−茎秆交接处等效应力、种芽−茎秆交接处应变及种芽−播种部件斜面接触应变变化规律;在单因素试验基础上,通过二次旋转正交组合试验研究,结合非线性多目标优化计算方法,对影响因素进行优化,以验证所建立回归模型的合理性。【结果】当跌落高度为167.83 mm、振动板安装倾斜角度为22.18°、振动频率为66.96 Hz时,种芽−播种部件斜面接触等效应力为32.64 MPa、种芽−茎秆交接处等效应力为17.08 MPa、种芽−茎秆交接处应变为0.094、种芽−播种部件斜面接触应变为1.049,模型预测结果与实际仿真结果相近,证明了回归模型的可靠性。【结论】本研究结果为揭示木薯种茎碰撞机制及播种装置优化等提供了理论依据。【Objective】To clarify the collision damage mechanism of cassava seed stems during the seeding process and seek a seeding method with less damage.【Method】Using 3D scanning technology to reversely establish a 3D model of cassava seed stem,and through finite element analysis of seed stem collision based on Hyper Mesh and LS-DYNA,the main influencing factors of seeding performance(drop height,installation inclination angle of vibration plate,and vibration frequency of vibration plate)were studied to investigate the process of seed stem collision damage.The variation law of the equivalent stress of the contact between the seed stem bud and the sowing component slope,the equivalent stress at the junction of seed bud and stalk,the strain at the junction of seed bud and stalk,and the strain of seed bud and sowing components slope contact at different experimental factor levels were clarified.On the basis of single factor experiments,a quadratic rotation orthogonal combination experiment was conducted to study the influencing factors,combined with nonlinear multi-objective optimization calculation methods,in order to verify the rationality of the established regression model.【Result】When the drop height was 167.83 mm,the installation inclination angle of the vibration plate was 22.18°,and the vibration frequency was 66.96 Hz,the equivalent stress of the oblique contact between the seed bud and the sowing component was 32.64 MPa,the equivalent stress of the intersection between the seed bud and the stalk was 17.08 MPa,the strain of the intersection between the seed bud and the stalk was 0.094,and the oblique contact strain of the seed bud and the sowing component was 1.049.The predicted results of the model were similar to the actual simulation results,proving the reliability of the regression model.【Conclusion】The results provide a theoretical basis for revealing the collision mechanism of cassava seed stems and optimizing the seeding device.

关 键 词：木薯 种茎 碰撞损伤 有限元分析 播种器 数值模拟 

分 类 号：S223.2[农业科学—农业机械化工程] S566.9[农业科学—农业工程]