Wang Jinwu, Xu Changsu, Qi Xin, Zhou Wenqi, Tang Han
College of Engineering, Northeast Agricultural University, Harbin 150030, China.
Key Laboratory of Crop Harvesting Equipment Technology of Zhejiang Province, Jinhua Polytechnic, Jinhua 321007, China.
Foods. 2022 Jan 22;11(3):295. doi: 10.3390/foods11030295.
To study the accumulation characteristics of rice seeds with different moisture content, an accurate model of rice seeds was established by 3D scanning technology. The accumulation state of rice seeds by the "point source" accumulation method was analyzed by proportioning and measuring the simulation parameters with different moisture content. The accumulation process was simulated at 10.23%, 14.09%, 17.85%, 21.77%, 26.41% and 29.22% moisture content, respectively. The velocity and force state of the seeds were visually analyzed by using the accumulation process with a moisture content of 29.22%. The accumulation process was divided into four stages according to the velocity characteristics of the seeds. The average force and kinetic energy of the rice seeds outside the cylinder were obtained, and the average force of the rice seeds outside the cylinder was proved to be the direct cause of the velocity change during the accumulation process. The mechanical characteristics of rice seeds in the quasi-static accumulation stage were partitioned and systematically analyzed. The force distribution of the "central depression" structure of rice seeds with a moisture content of 10.23%, 14.09% and 17.85% on the horizontal surface appeared. The higher the moisture content of rice seeds, the more likely the typical "circular" force structure appeared, and the more uniformly the force on the horizontal surface was distributed in the circumference direction.
为研究不同水分含量水稻种子的堆积特性，利用三维扫描技术建立了精确的水稻种子模型。通过配比和测量不同水分含量的模拟参数，分析了“点源”堆积法下水稻种子的堆积状态。分别在水分含量为10.23%、14.09%、17.85%、21.77%、26.41%和29.22%时模拟了堆积过程。利用水分含量为29.22%的堆积过程直观分析了种子的速度和受力状态。根据种子的速度特性将堆积过程分为四个阶段。得到了圆筒外水稻种子的平均受力和动能，证明圆筒外水稻种子的平均受力是堆积过程中速度变化的直接原因。对准静态堆积阶段水稻种子的力学特性进行了分区和系统分析。给出了水分含量为10.23%、14.09%和17.85%的水稻种子“中心凹陷”结构在水平面上的力分布。水稻种子水分含量越高，越容易出现典型的“圆形”力结构，且水平面上的力在圆周方向分布越均匀。
