冲击载荷作用下玉米种子的有限元分析
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摘要
为提高钉齿式玉米脱粒机在实际使用过程中的脱粒效果,进一步降低脱粒过程中玉米的破损率,对5 TY-10钉齿式玉米脱粒机不同转速(500、700、900 r/min)、含水率为10%的玉米籽粒不同部位在冲击载荷下受力进行仿真分析,采用LS-DYNA求解器对单个籽粒按照顶面受载、腹面受载、侧面受载等情况进行对比分析。结果表明:玉米籽粒不同部位受冲击,其受力大小不同,且随钉齿转速的增加,侧面、顶面、腹部中截面受力逐渐增大;当钉齿转速相同时,玉米籽粒腹部受冲击时中截面受力最大,侧面、顶面中截面受力大小相近。本研究可为钉齿式玉米脱粒机的设计提供必要的力学支撑,为玉米脱粒机的设计和优化提供技术指导和理论依据。
In order to improve the threshing effect of the nail-tooth type corn sheller during actual use,the corn breakage rate during the threshing process is further reduced. In this paper,the force simulation of 5 TY-10 nail corn thresher at different rotation speeds( 500 r/min,700 r/min,and 900 r/min) and corn kernels with different water cuts of 10% is analyzed under load and solved by LS-DYNA. The instrument performs comparative analysis of the individual grains according to the conditions of the top surface load,the ventral surface load,and the side load. The results showed that the different parts of the corn grain were impacted and the force was different. With the increase of the rotation speed of the spiked teeth,the cross-section stress of the side,top surface and abdomen gradually increased. When the spike speed is the same,the middle section of the maize grain receives the most force from the impact,and the side and top middle sections are similar in strength. The finite element analysis under the transient impact of corn kernels in this paper provides the necessary mechanical support for the design of spike-tooth corn sheller and provides technical guidance and theoretical basis for the design and optimization of corn sheller.
In order to improve the threshing effect of the nail-tooth type corn sheller during actual use,the corn breakage rate during the threshing process is further reduced. In this paper,the force simulation of 5 TY-10 nail corn thresher at different rotation speeds( 500 r/min,700 r/min,and 900 r/min) and corn kernels with different water cuts of 10% is analyzed under load and solved by LS-DYNA. The instrument performs comparative analysis of the individual grains according to the conditions of the top surface load,the ventral surface load,and the side load. The results showed that the different parts of the corn grain were impacted and the force was different. With the increase of the rotation speed of the spiked teeth,the cross-section stress of the side,top surface and abdomen gradually increased. When the spike speed is the same,the middle section of the maize grain receives the most force from the impact,and the side and top middle sections are similar in strength. The finite element analysis under the transient impact of corn kernels in this paper provides the necessary mechanical support for the design of spike-tooth corn sheller and provides technical guidance and theoretical basis for the design and optimization of corn sheller.
引文
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[2]侯明涛,张红梅.玉米籽粒物理机械及机械化收获适应性[J].江苏农业科学,2016,44(7):354-357.
[3]何晓鹏,刘春和.挤搓式玉米脱粒机的研制[J].农业机械学报,2003,19(2):105-108.
[4]王淑兰,于雷.柔性玉米脱粒机的开发[J].吉林农业,2012,(12):127.
[5] Fandohan P,Ahouansou R,Houssou P,et al. Impact of mechanical shelling and dehulling on infection and fumonisin contamination in maize[J]. Food Addit Contam,2006,23(4):415-421.
[6]李心平,马福丽.差速式玉米种子脱粒机的设计[J].农业机械学报,2008,39(8):192-195.
[7]吴多峰,许峰.板齿式与钉齿式玉米脱粒机的性能比较[J].农机化研究,2006(10):78-80.
[8]王显仁,李耀明.喷水稻脱粒破碎率与脱粒元件速度关系研究[J].农业工程学报,2007,23(8):16-19.
[9]李心平,高连心.玉米种子力学特性的有限元分析[J].农业机械学报,2007,38(10):64-68.
[10]高连心,李辉.含水率对种子玉米脱粒性能的影响机理[J].农业机械学报,2011,42(12):92-96.
[11]李清龙.打击式玉米脱粒机脱离过程试验与仿真分析[D].长春:吉林大学,2014.
[12]段建,刘秋.喷杆喷雾机前悬架上摆臂有限元及疲劳寿命分析[J].江苏农业科学,2017,45(18):236-239.
[13]陈孝海,鲁聪达.基于ANSYS的挤搓式玉米脱粒行为力学特性研究[J].轻工机械,2013,31(6):41-44.