 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Guide Vane Inclination Patterns on Threshing Losses and Power Requirement) ผู้เขียน: Khunnithi Doungpueng, Somchai Chuan-udom สื่อสิ่งพิมพ์:pdf AbstractA survey and also performance evaluation were undertaken of the guide vane inclination patterns in axial flow threshing units. The study involved two stages: 1) surveying the patterns of the guide vane inclination of rice combine harvesters and 2) studying the effect of the guide vane inclination on the threshing loss and the power requirement. The experiment was performed using the tester threshing unit of the Postharvest Technology Innovation Center, Khon Kaen University. There were three major findings. 1) Guide vane inclination can be adjusted using three patterns—namely, Group 1, where the guide vane inclination of the first 3 blades from the input was smaller than the last 2 blades; Group 2, where the guide vane inclination of all blades on average was similar; and Group 3, where the guide vane inclination of the first and last blades from the input was smaller than the blades at the center of the threshing chamber. 2) The guide vane inclination patterns studied did not have a significant effect on grain breakage, but did on threshing losses and power requirements. 3) The pattern of the guide vane inclination of axial flow rice threshing units for harvesting the Chainat 1 rice variety should be one where the inclination angles consistently increase through 69, 71, 73, 75 and 77 degrees from the threshing axial when the rotor speed is 18 m.s-1 and the feed rate is 16 t.hr-1. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Optimum Design Parameters in Terms of Total Specific Energy Requirements for the Rotary Blade Power Tiller under Unsaturated Sandy Clay Loam Soil Condition) ผู้เขียน:Mesfin Tafesse,  ดร.ศักดา อินทรวิชัย, รองศาสตราจารย์ , ดร.บัญญัติ เศรษฐฐิติ, รองศาสตราจารย์ , ดร.ธัญญะ เกียรติวัฒน์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA mathematical modeling approach was applied to predict optimum design parameters in terms of the total specific energy requirements of a “Pick”, a “C”, an “I”, an “L” and a “J”-shaped rotary blades. The modified total specific energy requirement model mainly has been includeds, the forward speed of the machine, the rotational speed, the depth of soil cut, the width of soil cut, the rotor radius, the angle of periphery, the angle of rotation, the specific soil resistance, the dry soil bulk density and volume of soil tilled. At the same working conditions the total specific energy requirement was predicted to be 231.61, 160.72, 196.87, 168.56 and 167.56 kJ / m3 for the “Pick”, the “C”, the “I”, the “L” and the “J”- shaped rotary blades, respectively. The highest specific energy requirement was exhibited by the “Pick”- shaped and the lowest by the “C”- shaped blade. The higher total specific energy requirement the lower volume of soil tilled and the most effective and optimum soil tillage operational cost is achieved. Compared to another study at the same soil condition the specific energy requirement per volume of soil tilled by the “Pick”- shaped blade was exhibited 1900 kJ / m3 which was higher by 87.81 % than the “Pick”- shaped blade in the present study. Therefore, the model suggests rotary tiller development under local conditions. |
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