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### Mathematical Model Development for Predicting Resistance Forces Exerted on a Single Shank during Earth Cutting

Mohamed M, Ibrahim Elsherif, Hussein Mahgoub, Shaker A.
2003 International Conference on Aerospace Sciences and Aviation Technology
In this paper a study is carried out to develop a mathematical model to predict resisting forces exerted on the single shank during cutting the earth based on the blade geometry parameters, operating conditions  ...  A computer program "SHANK" was made on the basis of this analytical study using a professional mathematical package.  ...  from effects above the surface INTRODUCTION Tool shape factors have a considerable effect on earth resistance forces during cutting.  ...

### Analysis of the energy consumption of a rotary harrow

Terenziano Raparelli, Alexandre Ivanov, Giuseppe Pepe, Gabriella Eula
2021 Journal of Agricultural Engineering
A proper use of a rotary harrow depends on its geometry and on the working parameters, such as: drag speed and angular speed.  ...  The model, validated through comparison with some experimental data, was then used to analyze the forces exchanged between the tines and the soil as a function of the drag speed, the angular speed and  ...  Therefore, the rotor of the rotary harrow was modeled as two tines, positioned on a disk, as this is the effective geometry used by the constructors. Figure 1 shows a view of the model of a rotor.  ...

### Study on the Interaction between Soil and the Five-Claw Combination of a Mole Using the Discrete Element Method

Yuwan Yang, Mo Li, Jin Tong, Yunhai Ma
2018 Applied Bionics and Biomechanics
In this study, we simulated the soil cutting process of the five-claw combination using the discrete element method (DEM) as an attempt for the potential design of soil-engaging tools to reduce soil resistance  ...  The curve of the soil rupture distance ratio with rake angles could be better described using a quadric function, but the speed had little effect on the soil rupture distance ratio.  ...  [5] showed that a biomimetic disc designed based on the profile curves of the second claw performed better in structural strength and cutting efficiency using finite element analysis. Tong et al.  ...

### Kinetics and Dynamics of the Stiff and Flexible Tines with the Duckfoot and the Coulter after Impact with Stones Embedded in Compacted Soil. Part II

Aleksander Lisowski, Adam Świętochowski, Magdalena Dąbrowska, Jacek Klonowski, Tomasz Nowakowski, Jarosław Chlebowski, Samuel Ferré, Martin Roberge
2022 Materials
For both soil conditions, the kinetics of the flexible tine was 24 times more reactive, and the dynamic loads were two times lower than for the stiff tine.  ...  The kinetics and dynamics of the stiff and flexible tines with the duckfoot and the coulter after impact with stones embedded in compacted soil were examined.  ...  The effects of improving the soil structure as well as loosening and mixing the soil depend on the type of tool and its geometry.  ...

### Effect of Stone Impacts on Various Ground Engaging Tools (Flexible/Stiff Tines and Coulter): Part I

Aleksander Lisowski, Adam Świętochowski, Magdalena Dąbrowska, Jacek Klonowski, Tomasz Nowakowski, Jarosław Chlebowski, Przemysław Tryskuć, Tomasz Parys, Samuel Ferré, Martin Roberge
2022 Materials
After the impact with the stiff tine, the stones were thrown the greatest distance of 0.26–1.08 m, and these distances were strongly dependent on the working speed and slightly dependent on the working  ...  The characteristics of stone movement were specific to the type of tool and were described by the Numerical Stone Movement Scale developed for the purpose of the research.  ...  Materials resistant to abrasion, thermo-chemical treatments increasing resistance to variable loads, and shapes with variable geometry both for tines or shafts and working elements are used.  ...

### Prediction of the immediate effects of traffic on field soil qualities

P. Lerink
1990 Soil & Tillage Research
Damsté of the Department of Mathematics of the Wageningen Agricultural University for their help in analysing strain algebraically and processing the experimental data.  ...  ACKNOWLEDGEMENTS The authors wish to acknowledge Prof. Dr. B. van Rootselaar and Dr. B.R.  ...  The penetration resistance is expressed as the cone index, being the quotient of the mean vertical force during penetration and the cone-base area ( [MPa] ).  ...

### Working Performance of the Low-Adhesion and Anti-Slip Bionic Press Roller in the Rice–Wheat Rotation Area

Hongjun Liu, Wei Yan, Yao Ji, Wenyi Zhang
2022 Agriculture
The field tests were carried out, and the orthogonal test was used to investigate the effects of forward speed, load, and structural parameters on the operation performance of the bionic press roller.  ...  During the working process of a conventional press roller in the rice–wheat rotation area, the phenomenon of soil adhesion and a large slip rate, which are directly related to the growth and the output  ...  Definition of tine trajectory and parameters. Figure 6 . 6 Figure 6. Bionic press roller. Figure 7 . 7 Figure 7. Finite element model of roller and soil. Figure 8 . 8 Figure 8.  ...

### Design, Development, and Performance Evaluation of a Trash-Board Moldboard Plow for the Interaction between Soil and Straw with Two Different Water Content Levels

Farid Abdallah, Weimin Ding, Qishuo Ding, Genxing Pan
2016 Agronomy
Crop residue standing above the soil surface is five to ten times more effective in preventing wind erosion than the same mass of residue lying flat on the soil surface [18] .  ...  Using the moldboard plow increases energy consumption, which decreases the impedance of soil; therefore, it is effective in improving crops' growth [17] .  ...  Conflicts of Interest: The authors declare no conflict of interest.  ...

### Animating sand as a fluid

Yongning Zhu, Robert Bridson
2005 ACM SIGGRAPH 2005 Papers on - SIGGRAPH '05
To allow for efficiently scaling up to large volumes of sand, we abstract away the individual grains and think of the sand as a continuum.  ...  Our core representation is a cloud of particles, which allows for accurate and flexible surface tracking and advection, but we use an auxiliary grid to efficiently enforce boundary conditions and incompressibility  ...  And I want to thank Professor Ian Mitchel who has carefully read the thesis, and proposed valued suggestions.  ...

### Shock and vibration computer programs: Reviews and summaries

W. Pilkey, B. Pilkey
1976 International Journal of Mechanical Sciences
Their efforts have been massive, requiring the collection of information on available programs, the preparation of questionnaires for program developers and users, the critical review of the programs'  ...  The methods used for solving dynamics problems are outlined and the techniques employed for incorporating various material properties are scrutinized.  ...  The discussion of these methods is limited to finite element techniques and the finite elements used for piping analysis are briefly described.  ...

### Testing and Data Recovery Excavations at 11 Native American Archeological Sites Along the U.S. Highway 271 Mount Pleasant Relief Route, Titus County, Texas Volume II

2014 Index of Texas Archaeology Open Access Grey Literature from the Lone Star State
The primary relevant historic context for future work on this project is The Development of Agriculture in Northeast Texas Before a.d. 1600 (Kenmotsu and Perttula 1993).  ...  houses, on individual house lots, within villages, between one or more contemporaneous villages, and as villages and other components of the settlement system (e.g., field houses, mounds, cemeteries,  ...  Macrobotanical Analysis Manchaca, Texas Acknowledgments We acknowledge Tim Ferguson for his role in preparing the samples for irradiation.  ...

### Soil mineralogy [chapter]

Raj K. Gupta, I. P. Abrol, Charles W. Finkl, M. B. Kirkham, Marta Camps Arbestain, Felipe Macías, Ward Chesworth, James J. Germida, Richard H. Loeppert, Maurice G. Cook, G. O. Schwab, Krystyna Konstankiewicz (+8 others)
2008 Encyclopedia of Earth Sciences Series
The circular tubing changes to a slight oval shape, which becomes stabilized because the soil on the sides of the tubing resists the outward movement.  ...  An increase in penetration resistance results in a reduction of the root length per unit surface area.  ...  Current agriculture as practiced in the industrialized world is heavily dependant on the energy of fossil fuels, and for that reason (if for no other) is inherently unsustainable.  ...

### Sabkha [chapter]

2008 Encyclopedia of Earth Sciences Series
The circular tubing changes to a slight oval shape, which becomes stabilized because the soil on the sides of the tubing resists the outward movement.  ...  An increase in penetration resistance results in a reduction of the root length per unit surface area.  ...  Current agriculture as practiced in the industrialized world is heavily dependant on the energy of fossil fuels, and for that reason (if for no other) is inherently unsustainable.  ...

### Expedition 381 methods [chapter]

L.C. McNeill, D.J. Shillington, G.D.O. Carter, J.D. Everest, E. Le Ber, R.E. Collier, A. Cvetkoska, G. De Gelder, P. Diz, M.L. Doan, M. Ford, R.L. Gawthorpe (+23 others)
2019 Proceedings of the International Ocean Discovery Program
the reading, the value of which corresponds to the penetration resistance.  ...  Once the tool descended into the hole, the heave compensation system of the ship limited vertical movement of the rooster box and logging sheave to less than 10 cm.  ...

### ÖBG-MitteilungenHeft53

ÖBG
1996 Zenodo
Acknowledgrnents : the author of this paper could not have written this paper without the dedicatio'n of the coordinators and all the scientists, both from the EU and Associated Countries and from the  ...  References Specific: Acknowledgements Funding by the Ministry of Environment of the State Baden-Württemberg is .gratefully . acknowledged.  ...  If the effects of such changes on the appropriate rate constant can be estimated, then a useful sensitivity analysis can be obtained.  ...
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