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首页> 外文期刊>Journal of Mechanical Engineering Research >Mathematical modeling, simulation and analysis of rice grain movement for design and fabrication of low-cost winnowing machine
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Mathematical modeling, simulation and analysis of rice grain movement for design and fabrication of low-cost winnowing machine

机译：低成本风选机设计与制造的稻米运动数学建模，仿真与分析

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Winnowing called “Dhan Battaune” in Nepali is the process of separation of unwanted matters from paddy after threshing. In the conventional method; it requires at least four person to produce strong wind by bamboo basket (“Nanglo” in Nepali) to blow away straw, leaves of grasses and other unwanted matters; process starting with one of them pouring the sun dried grains from certain height. To perform MATLAB simulation for designing the screening chamber, a sample of 20 rice grains out of half kilogram was selected to measure its length, width and thickness. To locate the flow pattern, grains of highest weight 0.0324 mg and mean weight 0.0228 mg were considered and simulation was performed in MATLAB with drag coefficient 0.4 which indicated screening chamber as 0.4 m × 0.4 m. The rice-husk movement was also observed in ANSYS CFX which validate the result obtained from MATLAB as the recommended screening chamber design clearly separate them owing to their weight differences. Series of modification were done for better performance of the machine. This resulted in a final product having 0.16 m × 0.10 m grain outlet and 0.20 m × 0.20 m husk outlet in which 19 kg of rice grain were tested in average separation time of 70.8 s for five trails. The overall productivity of the machine was calculated to be 966.10 kg/h which is a promising result for the power consumption of 3.10 units per hour.
机译：风选称为“ Dhan Battaune”尼泊尔的脱粒过程是将不需要的物质从稻谷中分离出来的过程。在常规方法中;至少需要四个人才能用竹basket（尼泊尔语中的“ Nanglo”）吹出强风吹走稻草，草叶和其他有害物质;过程从其中之一开始，从一定高度倒入晒干的谷物。为了进行MATLAB仿真设计筛分室，选择了半公斤中的20种米粒作为样品，以测量其长度，宽度和厚度。为了确定流型，考虑了最大重量为0.0324 mg和平均重量为0.0228 mg的晶粒，并在MATLAB中以阻力系数0.4进行了模拟，表明筛分室为0.4 m×。 0.4米在ANSYS CFX中还观察到稻壳运动，这验证了从MATLAB获得的结果，因为推荐的筛分室设计因其重量差异而将它们清楚地分开了。进行了一系列修改以提高机器性能。最终产品的质量为0.16 m×。出粮口0.10 m，0.20 m次; 0.20 m稻壳出口，其中5条小径的平均分离时间为70.8 s，测试了19 kg稻谷。机器的总生产率计算为966.10 kg / h，这对于每小时3.10单位的能耗而言是一个令人鼓舞的结果。

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