Authors

Abstract

The disorder flow of seeds caused by the collision in the seed-guiding tube is one of the important reasons for the reduction of seeding uniformity. For this problem, a seed-guiding tube with brachistochrone considering the influence of friction was presented in this paper. By analyzing kinetics and rotating the equation coordinate system, brachistochrone under the condition of friction was obtained and applied to the design of the structural parameters of the grain conductor of T-groove furrowing device, and a discrete element model of the grain conductor and wheat was established, thus single-factor simulation analysis and quadratic regression orthogonal rotation combination simulation tests were conducted to explore the optimal combination of parameters. The test results showed that the seed-guiding tube had a brachistochrone radius of 14.708 mm, a linear length of 500 mm and a working speed of 4 km/h, and the seed spacing offset dispersion degree and the seed lateral offset dispersion degree were 12.26 and 8.53 respectively, which had a high seeding uniformity. The results of the bench validation test showed that the coefficients of variation of the two test evaluation indexes between the bench test results and the virtual simulation results were 10.20% and 8.62% respectively, therefore the simulation results could be used for the optimization of the seed guide tube.

Abstract in Chinese

种子在导种管内因碰撞引起的种子无序流动是导致排种均匀性降低的重要原因之一，针对该问题，本文设计了一种考虑摩擦影响的最速降线导种管。通过动力学分析与旋转方程坐标系等方法得到了考虑摩擦条件下的最速降线，并将其应用于T型槽开沟装置导种管的结构参数设计中，建立了导种管与小麦离散元模型，进行单因素仿真分析与二次回归正交旋转组合仿真试验探究最优参数组合。试验结果表明，导种管最速降线旋轮半径为14.708mm、直线段长度为500mm、工作速度为4km/h时，粒距偏移离散度和种粒横向偏移离散度分别为12.26与8.53，具有较高的排种均匀性。台架验证性试验结果表明，台架试验结果与虚拟仿真结果的两项试验评价指标变异系数分别为10.20%、8.62%，仿真结果能够用于导种管的优化。