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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Regression Modeling of Fuel Cosumption Optimization of Rotary Blades of Power Tiller Under Sandy Clay Loam Condition) ผู้เขียน: Mesfin Tafesse,  ดร.ศักดา อินทรวิชัย, รองศาสตราจารย์ , ดร.บัญญัติ เศรษฐฐิติ, รองศาสตราจารย์ , ดร.ธัญญะ เกียรติวัฒน์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractFuel consumption optimization is one of the selection criteria of tractor tillage implementation. However, studies that concern with various rotary blades of power tiller fuel consumption optimization model under sandy clay loam conditions has not so far been determined and documented. The objectives of this paper were to modify the fuel consumption mathematical model, optimize the objective function and to evaluate the efficiency of a “pick”, a “C”, an “I”, an “L” and a “J”-shaped rotary blades. Ultimately a modified fuel consumption mathematical model accounting for the integrated system parameters of various rotary blades was derived. The derived system parameters in this model include rotational velocity (N), rotor radius (R), depth of tillage (Ld), cutting width (Bw), velocity ratio (?) and volume of soil tilled (Vst). Optimal solutions of these system parameters as well as the corresponding fuel consumption were obtained. To validate the model and test, sensitivity and correlation coefficient analysis were used. Results from the sensitivity analysis revealed that depth of tillage and cutting width were found to be highly significant parameters influencing fuel consumption requirement. Amongst the five rotary blades tested, however, depth of tillage of the “L” and the “J”-shaped were the most significant parameters to change fuel consumption requirement. The output of sensitivity analysis from the rate of depth of tillage showed a trend of reduction from 28.57% to 18.18 % for the “L” and 54.55% to 26.09 % for the “J”- shaped rotary blade. Consequently, fuel consumption rate reduced from 0.0843% to 0.0841% for the “L” and 0.272 % to 0.271 % for “J” -shaped. However, the cutting width of the “J” -shaped increased from 6.67 % to 7.69 %, while fuel consumption requirement rate increased from 0.017 % to 0.023 %. Similarly, correlation coefficient analysis revealed that depth of tillage and cutting width correlation coefficient (r) was predicted to be 0.7 and 0.5, respectively. Consequently, the p-value for depth of tillage was significant (p< 0.05), while for the cutting width was highly significant (p< 0.01). |
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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