基于Workbench LS-dyna的花生荚果脱壳受力仿真研究

Simulation Study on Peanut Pod Shelling Force Based on Workbench LS-dyna

为研究花生荚果在机械脱壳时的受力变化规律,进一步改善花生脱壳机脱壳效率,降低机械化脱壳破损率,以山东胶州试验田主要种植品种宇花14号为研究对象,以破壳力为试验指标,不同滚筒转速(190、200、210 r/min)、花生荚果不同受力位置(正面、侧面、顶面)为影响因素,对花生荚果脱壳受力情况作单因素试验分析,在Solidworks中建立脱壳机构与花生荚果三维模型,使用Hypermesh软件对试验模型进行网格划分,导入Workbench LS-dyna模块进行碰撞动力学仿真研究。结果表明:花生荚果受力位置不同,所受击打力大小不同,并且随着滚筒转速的增加,不同位置受力大小逐渐增大;当滚筒转速一定时,花生荚果顶面位置受力最小,侧面位置受力最大,正面位置受力介于二者之间。本研究相较静力学仿真更具真实性与准确性,为滚筒凹板筛式花生脱壳机械的设计提供了理论依据与技术支撑。

In order to study the stress variation law of peanut pods during mechanical shelling,further improve the shelling efficiency of peanut sheller and reduce the damage rate of mechanized shelling,the mainly planted variety Yuhua14 in Jiaozhou Shandong experimental field was taken as the research object,and the shelling force was taken as the test index.Different drum speeds(190,200 and 210 r/min)and different stress positions(front,lateral,top)of peanut pods were taken as influencing factors.The single factor test analysis of peanut pods was carried out,and the shelling mechanism and three-dimensional model of peanut pods were established in Solidworks.Hypermesh software was used to mesh the test model,and Workbench LS-dyna module was imported for collision dynamics simulation.The results showed that:in different positions of the peanut pods,the impact force is different,and with the increase of drum speed,the force of different positions gradually increased;when the rotational speed of the drum is constant,the force on the top of the peanut pod is the smallest,the force on the lateral is the largest,and the force on the front is between them.This study is more authentic and accurate than static simulation,and provides theoretical basis and technical support for design of drum concave sieve peanut shelling machine.