Understanding soil disturbance behaviors under the impact of the winged subsoiler is critical for designing or optimizing the winged subsoiler(a primary subsoiling tool).In this study,a soil-winged subsoiler interacti...Understanding soil disturbance behaviors under the impact of the winged subsoiler is critical for designing or optimizing the winged subsoiler(a primary subsoiling tool).In this study,a soil-winged subsoiler interaction model was developed and the effects of winged subsoiler on soil disturbance behaviors were investigated using the discrete element method(DEM)simulations and lab soil-bin tests.The results showed that wings mainly affected the disturbance range and fragmentation degree of soil above them.The draught forces of share section(SS),arc section in the hardpan(ASHP),arc section in the top layer(ASTL)and line section(LS)were accounted for 69.53%,25.22%,4.73%and 0.52%of the total draught force of winged subsoiler;the lateral disturbance range from high to low of the soil at different depths followed the ranking:top layer(TL),hardpan disturbed by arc section(HDAS)and hardpan disturbed by share section(HDSS).Wings had the greatest influence on the draught force of ASHP.Adding wings to an arc-shaped subsoiler increased the disturbance areas of HDAS,TL and HDSS by 47.52%,7.74%and 4.59%,respectively,but meanwhile increased the total draught force by 36%.Compared with a non-winged subsoiler,winged subsoiler had higher soil looseness(15.83%),soil disturbance coefficient(58.59%),furrow width(448.65 mm)and soil disturbance area ratio(0.3835),but poorer soil surface flatness(19.79 mm)and lower soil loosening efficiency(39.35 mm²/N).This study provided critical information for optimizing winged subsoilers on aspects of improving soil loosening effectiveness and reducing draught force.展开更多
Over the past decades,scientists have studied tillage and soil processing technologies based on the classical shapes of agricultural tools.Numerous studies highlight the importance of agricultural tool longevity in re...Over the past decades,scientists have studied tillage and soil processing technologies based on the classical shapes of agricultural tools.Numerous studies highlight the importance of agricultural tool longevity in relation to abrasive wear resistance and draught force values.However,these studies are typically limited to the most common shapes and types of tools.This paper combines the insights gained from the marine industry's experience in the design of ship's bulbous bows with the challenges of designing soil rippers for agricultural machinery.New shape elements were developed based on the delta,oval,and nabla types of bulbous bows used in ships.Thirteen types of designed elements,along with the original shape,were tested virtually using the Discrete Element Method(DEM).The 3D-printed samples were then tested in a sand bin to measure draught force.DEM simulation parameters were validated by measuring the Static Angle of Repose(SAOR)of sand.The results of this study demonstrate that applying a bulbous bow-inspired shape to the soil ripper can reduce draught force by 7.1%;however,in some cases,it can also increase the force by 4.1%compared to the original shape.The values are giving statistically significant differences between the experimental measurements.To fully evaluate the application of these designed elements,further soil disturbance and wear analysis studies should be conducted in future research.展开更多
基金The authors gratefully acknowledge the financial assistance received from the National Key Research and Development Program of China(Grant No.2016YFD0200601,2016YFD020060101)and the Key Industry Chain Innovation Project of Shaanxi Province(Grant No.2018ZDCXL-NY-03-06).
文摘Understanding soil disturbance behaviors under the impact of the winged subsoiler is critical for designing or optimizing the winged subsoiler(a primary subsoiling tool).In this study,a soil-winged subsoiler interaction model was developed and the effects of winged subsoiler on soil disturbance behaviors were investigated using the discrete element method(DEM)simulations and lab soil-bin tests.The results showed that wings mainly affected the disturbance range and fragmentation degree of soil above them.The draught forces of share section(SS),arc section in the hardpan(ASHP),arc section in the top layer(ASTL)and line section(LS)were accounted for 69.53%,25.22%,4.73%and 0.52%of the total draught force of winged subsoiler;the lateral disturbance range from high to low of the soil at different depths followed the ranking:top layer(TL),hardpan disturbed by arc section(HDAS)and hardpan disturbed by share section(HDSS).Wings had the greatest influence on the draught force of ASHP.Adding wings to an arc-shaped subsoiler increased the disturbance areas of HDAS,TL and HDSS by 47.52%,7.74%and 4.59%,respectively,but meanwhile increased the total draught force by 36%.Compared with a non-winged subsoiler,winged subsoiler had higher soil looseness(15.83%),soil disturbance coefficient(58.59%),furrow width(448.65 mm)and soil disturbance area ratio(0.3835),but poorer soil surface flatness(19.79 mm)and lower soil loosening efficiency(39.35 mm²/N).This study provided critical information for optimizing winged subsoilers on aspects of improving soil loosening effectiveness and reducing draught force.
基金This project has received funding from the Research Council of Lithuania(LMTLT),agreement No S-PD-24-31.
文摘Over the past decades,scientists have studied tillage and soil processing technologies based on the classical shapes of agricultural tools.Numerous studies highlight the importance of agricultural tool longevity in relation to abrasive wear resistance and draught force values.However,these studies are typically limited to the most common shapes and types of tools.This paper combines the insights gained from the marine industry's experience in the design of ship's bulbous bows with the challenges of designing soil rippers for agricultural machinery.New shape elements were developed based on the delta,oval,and nabla types of bulbous bows used in ships.Thirteen types of designed elements,along with the original shape,were tested virtually using the Discrete Element Method(DEM).The 3D-printed samples were then tested in a sand bin to measure draught force.DEM simulation parameters were validated by measuring the Static Angle of Repose(SAOR)of sand.The results of this study demonstrate that applying a bulbous bow-inspired shape to the soil ripper can reduce draught force by 7.1%;however,in some cases,it can also increase the force by 4.1%compared to the original shape.The values are giving statistically significant differences between the experimental measurements.To fully evaluate the application of these designed elements,further soil disturbance and wear analysis studies should be conducted in future research.
