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Furrow design for improving crop establishment of two-wheel tractor operated strip tillage planters in loam and clay loam soils

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International Journal of Agricultural and Biological Engineering 2021年第3期14卷 130-139页

作者： M.Arshadul Hoque M.M.Hossain A.T.M.Ziauddin Timothy J.Krupnik Mahesh K.Gathala Senior Scientific Officer FMP Engineering DivisionBangladesh Agricultural Research InstituteGazipur-1701Bangladesh Department of Farm Power and Machinery Bangladesh Agricultural UniversityMymensingh-2202Bangladesh International Maize and Wheat Improvement Center-Bangladesh Dhaka-1213Bangladesh

Conservation agriculture(CA)based production systems may help in achieving more sustainable intensification of cropping systems that use less labour and energy and have higher profit margins,in addition to soil conservation and environmental impact mitigation *** these objectives can only be achieved when the right mechanization options,including appropriate crop establishment equipment,are in place to assist in timely field *** urgent need exists,therefore,to fine tune and re-adjust the existing two-wheel tractor(2WT)operated seed drills,with specific reference to the design of blade and furrow openers,while at the same time considering performance in different soil types and *** this end,experiments were conducted during 2013-2014 and 2014-2015 at two BARI Regional Agricultural Research Stations in Jamalpur and Barisal,Bangladesh,on a loam and clay loam soil,respectively,to evaluate five types of furrow opener for strip *** and modified shoe-type furrow openers were tested and compared with three inverted-T furrow openers with rake angles of 75°,65°and 55°.The newly designed inverted-T furrow openers were narrower than the shoe-type openers;they also had a longer,hollow shanks and provided better options for adjustment to achieve the desired seeding depth and line *** to shoe-type openers,better seeding depth,uniformity and higher degree of seed coverage were recorded with use of the inverted-T furrow opener with a 65°rake *** resulted in better seed coverage in the furrow,a higher emergence rate index,and the highest emergence percentage of maize and mung *** research findings can be generalized to smallholder production systems on loam and clay loam soils where farmers utilize 2WT operated seed drills for crop establishment in both traditional and conservation agriculture-based planting systems.

关键词： two-wheel tractor strip tillage planter inverted-T furrow opener rake angle conservation agriculture emergence percentage

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Five-plane lancet needle design for soft PVC phantom tissue cutting

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Bio-Design and Manufacturing 2018年第3期1卷 195-202页

作者： Yancheng Wang Deqing Mei State Key Lab of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang UniversityHangzhou 310027 China Key Laboratory of Advanced Manufacturing Technology ofZhejiang Province School of Mechanical EngineeringZhejiang University Hangzhou 310027 China

Lancet needle, having three planes at the tip to generate a sharp lancet point, is the most common needle tip geometry and used for medical procedures. This research presents two five-plane lancet needle designs, the five-plane lancet needle with two back bevels （FLN-B） and five-plane lancet needle with two front bevels （FLN-F）, to study the effects of two additional bevel planes on the reduction of soft tissue cutting force. Mathematical models to calculate the inclination angle and rake angle along the cutting edges of FLN-B and FLN-F are developed. By using the grinding process, the prototype FLN-B and FLN-F needles are fabricated. And their inclination and rake angles along the cutting edges are investigated and compared to that of regular lancet needle. Needles insertion tests were conducted on soft PVC phantom which mimics the soft tissue. The initial peak insertion force and steady-state cutting force during needle insertion were identified, and the effect of cutting edge on needle soft tissue cutting force was studied. Compared to lancet needle, FLN-B and FLN-F both have higher inclination and rake angles at the tip cutting edge, could reduce the initial peak needle insertion force and tissue cutting forces, and thus can efficiently cut the soft tissue for medical applications.

关键词： Lancet needle Needle insertion force rake angle Inclination angle Bevels Five plane

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Regression Equations for Predicting the Effect of Tine Width on Draught and Soil Translocation in Moderately Fine Textured Soil

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Journal of Environmental Science and Engineering(B) 2012年第6期1卷 820-825页

作者： Seth Idowu Manuwa Olugboyega Cornelius Ademosun Adebola Adesina Department of Agricultural Engineering School of Engineering and Engineering Technology The Federal University of TechnologyAkure 704 Nigeria

Experiments were conducted in an indoor soil bin filled with sandy clay loam soil. Tests were carried out with tillage tines to study the effect tool width on soil disturbance and draught. Depth of operation was held constant at 35 mm and then at 70 mm while speed was varied at three levels of 1.0, 3.6 and 9.0 km/h. The widths of the tines tested were 10, 20, 31, 40, 51, 88, 126, 163 and 200 mm. The cone penetration resistance of the soil varied from 400 to 600 kPa. Draught was measured with a load cell while soil disturbance was measured with a profile meter and meter rule. Draught increased at a decreasing rate with tine width. Quadratic models best fitted the data points with high R2 values. The increase in draught was affected by the forward speed since higher draught values were obtained at higher speed. Results show that the parameters of soil disturbance increased with increase in tine width, except height of ridge （hr）, which did not show any specific trend. The specific draught was highest （10.63 N/cm） with tine T20 while Tine T1 had the least specific draught of 5.2 N/cm.

关键词： Soil bin tillage tines draught soil disturbance parameters rake angle forward speed regression analysis

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Simulation of Cutting Tool Geometry Parameters Impact on Residual Stress

Simulation of Cutting Tool Geometry Parameters Impact on Res...

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2009中国控制与决策会议

作者： Fan Ning~(1,2),Chen Ming~2,Guo Peiquan~1 1.School of Mechanical Engineering,University of Jinan,Jinan 250022,China 2.School of Mechanical Engineering,Shanghai Jiaotong University,Shanghai 200240,China

The residual stress on workpiece surface has close relation with cutting tool geometry parameters including rake angle and rounded cutting edge *** residual stress under different parameter cutting conditions is analyzed by FEM simulation in present *** is proved that,in a certain range of rake angle,the tensile residual stress is generated on workpiece surface,which increases with rake angle increase at first and decreases *** residual stress layer thickness has no obvious relation with rake angle *** residual stress decreases gradually with rounded cutting edge radius increase,but the depth of residual stress layer thickness becomes larger.

关键词： FEM Residual Stress rake angle Rounded Cutting Edge Radius

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