摘要
针对基于圆周电磁振动的玉米种子定向排序输送装置的优化缺乏理论指导的问题,该文以角振幅θ0、玉米种子所处圆周半径r以及正向圆周运动角速度θ?为主要参数,采用柱坐标系对圆周电磁振动下单粒玉米种子的运动特性进行了理论研究和试验分析,得到以下结果:1)玉米种子相对运动特性表现为:其正向圆周运动、反向圆周运动、抛掷运动和离心运动都有着与之对应的临界角振幅(θ01、θ02、θ03和θ04),其中θ01<θ02<θ03,θ03为0.012 9 rad不变,θ01、θ02和θ04随玉米种子所处圆周半径r的增大而减小;2)玉米种子自身运动特性表现为:只有当胚面朝上时,玉米种子才表现出通过自身运动使尖端朝向与圆周运动切线方向一致的规律;3)圆周电磁振动器的最佳工作角振幅为0.008 rad,此时无论胚面朝上或朝下,玉米种子正向圆周运动角速度θ?均达到最大(胚面朝上时4.15°/s、胚面朝下时4.03°/s)。该研究丰富了圆周电磁振动下物料的运动理论,为玉米种子定向排序输送装置的优化提供了理论基础。
At present, the theory of the motion of the material under the electromagnetic vibration is still not perfect, which results in the lack of theoretical guidance for the optimization of the directional arrangement device of corn seeds based on circular electromagnetic vibration. To solve this problem, the theoretical research on the movement characteristics of single corn seed under the circular electromagnetic vibration was carried out in cylindrical coordinate system, and the working angle amplitude, the occupied circle radius of corn seed and the angular velocity of corn seed＇s forward circular motion were taken as the main parameters in this paper. And the theoretical research consisted of 2 main parts： relative motion theory and self motion theory. Then, the practical experiments on single corn seed were carried out under 2 conditions of embryo face up and down. The practical experiments included 3 parts： the relative motion characteristics test, the self motion characteristics test and the forward circular motion characteristics test. The state changes of relative motion, self motion and the size changes of the angular velocity of corn seed＇s forward circular motion were observed under different working angle amplitude and occupied circle radius of corn seed in each test. The theoretical analysis could be verified and supplemented by the practical experiments. The following results were gained： 1） The relative motion characteristics of single corn seed showed that under the electromagnetic vibration there were 4 primary movement states： forward circular motion, reverse circular motion, throwing motion and centrifugal motion, and there were also 4 critical angle amplitudes respectively corresponding to the states. It meant that when the working angle amplitude of circular electromagnetic vibrator reached each critical angle amplitude, the single corn seed would carry out the corresponding movement. The effect of the embryo＇s direction of single corn seed on 4 critical angle amplitudes was very
作者
邢洁洁
徐丽明
史丽娜
刘文
高振铭
Xing Jiejie Xu Liming Shi Lina Liu Wen Gao Zhenming(College of Engineering, China Agricultural University, Beijing 100083, China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2016年第23期21-28,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然基金项目(51475461)
关键词
作物
振动
种子
圆周电磁振动
相对运动
自身运动
柱坐标系
crops
vibration
seed
circular electromagnetic vibration
relative movement
self movement
cylindrical coordinate system
