Authors

Abstract

Soybean seed physical properties is important on filling performance during planting. To evaluate the effect of sphericity and variation coefficient of mean diameter on seeding performance in seed metering device, seven soybean genotypes [The Ken Dou 40, Ken Feng 17, Qing Ren Black Soybean, Black Soybean, Hei He 44, Bei Jiang 91 and Dong Nong 52] were tested to measure the length, width, thickness, and calculate these sphericities, mean diameter and variation coefficient of mean diameter, respectively. The model of soybean seed with equal mean diameter was developed and the discrete element method was used to set the different sphericity and variation coefficient of mean diameter. A simulation study was performed in the model of the cell wheel feed followed by mathematical modeling of the experimental data, and the data with response to the surface methodology was analyzed. Results showed that while the sphericity had a significant effect on both single- and empty -seed rates, the variation coefficient of mean diameter had a significant effect on the multi -seed rate. With the increase of sphericity, the single-seed rate increases but empty-seed rate decreases. With the increase of variation coefficient of mean diameter, the multi-seed rate increases. Based on our results, the Ken Feng17, Ken Dou 40, Black Soybean and Qing Ren Black soybeans were only selected for bench test. The relative error between the experimental results and the theoretical values of the regression analysis was small; however, the respond trend of factor index was same. Our study suggested that the effect of sphericity and variation coefficient of mean diameter on seeding performance can be used by using simulation experiment.

Abstract in Chinese

大豆种子的物理特性对充种过程中的充填性能影响非常重要，为了探究球度与均径变异系数对种子在排种器中充填性能的影响，选取7种不同品种的大豆种子[垦豆40,垦丰17,青仁黑豆,黑豆,黑河44,北疆91和东农52]为试验对象，分别测量种子的长度、宽度、厚度，并计算种子的球度、均径变异系数，建立相同均径的大豆种子模型，并采用离散元法设置不同的球度和均径变异系数，并在窝眼轮式排种器模型中进行仿真试验。构造试验数据的数学模型，并进行响应曲面分析，结果表明：球度对单粒率和空粒率影响显著，均径变异系数对多粒率影响显著；随着球度的增加，单粒率升高，空粒率减小；随着均径变异系数的增加，多粒率升高。依据结果，选择垦丰17、垦豆40、黑豆和青仁黑豆进行台架试验，其试验值与回归方程输出理论值的相对误差较小，且具有相同的因素指标响应趋势，即利用仿真试验研究球度及均径变异系数对排种性能的影响具有可行性。