AKTU Soil Dynamics in Tillage and Traction (HTFP401) Syllabus PDF – B.Tech Honors Degree in Farm Machinery and Power Engineering
Soil Dynamics in Tillage and Traction HTFP401
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- Semester 4
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Syllabus — Soil Dynamics in Tillage and Traction
Download PDFHTFP401 · 4 credits · L-T-P 3-1-0
| Pre-requisites (if any) | Basic knowledge of strength of material and farm machinery. |
Course Outcomes
Course Outcomes
Course Outcomes
| CO 1 | Understanding and analysis of the state of stress at a point, utilizing Mohr’s Circle, Coulomb’s law of friction and cohesion, and employing various soil resistance measurement techniques. | K2 &K4 |
| CO 2 | Analyzing soil behavior by soil water pressure, movement, and critical state soil mechanics principles, soil stress-strain behavior and shear rate effects. | K4 |
| CO 3 | Understanding soil cutting forces considering a universal earthmoving equation, analyzing two-dimensional cases in cohesive soil, tool-to-soil adhesion, failure surfaces, Hettiaratchi's calculations, effect of soil weight, and method of trial wedges | K2 &K4 |
| CO 4 | Understand soil mechanics theory from Hettiaratchi, Reece-Godwin, and Spoor, McKyes and Ali, Grisso models, dynamic effects, the concept of critical depth, complex tool shapes, soil loosening and manipulation efficiency, draft force efficiency, and factors influencing soil mixing. | K2 |
| CO 5 | Understanding the mechanics of traction devices, maximum traction force and slip analysis, contact areas, evaluating sinkage using Bekker's and McKyes' formulas, and a soil compaction. | K2 |
K1- Remember, K2- Understand, K3- Apply, K4- Analyze, K5-Evaulate, K6- Create
Course Content
Characterization of state of stress in a point: Derivation, representation by Mohr’s Circle. Coulomb’s law of friction and cohesion. Measurement of soil resistance properties: Direct shear box, torsion shear apparatus, tri-axial apparatus.
Soil behaviour considerations: Soil water pressure and movement. Critical state soil mechanics: Soil stress-strain behaviour, shear rate effects.
Soil cutting forces: The universal earthmoving equation, two dimensional cases, smooth vertical blade, smooth and rough raked blades in cohesive soil, unconstrained tool to soil adhesion. The shape of failure surfaces.
Hettiaratchi’s calculations, effect of soil weight. Soil cutting force by method of trial wedges.
Extension of theory to three dimension: Hettiaratchi, Reece-Godwin and Spoor. Three dimensional wedges:
McKyes and Ali, Grisso models. Dynamic effect: Inertial forces, change in soil strength. Concept of critical depth. Complex tool shapes: Curved tools-shank and foot tools-mould board plough. Soil Loosening and manipulation: Measurement of soil loosening and its efficiency. Draft force efficiency: Loosening and pulverization efficiency. Soil mixing and inversion: Soil properties, tool shape, tool speed and tool spacing.
Traction devices: Tyres, type, size, selection mechanics of traction devices. Maximum traction force: Soil deformation and slip, estimation of contact areas. Sinkage in soil: Rolling resistance, Bekker’s formulae, McKyes formulae. Soil compaction by agricultural vehicles and machines.
- Gill WR and Van den Berg GE. 1968. Soil Dynamics in Tillage and Traction.
- John BL, Paul KT, David WS and Makoto H. 2012. Tractors and their Power Units. 4th Edition. Springer Science & Business Media, ISBN: 81-239-0501-7, ASAE ISBN: 0-929355- 72-5.
- Koolen AJ and Kuipers H. 1983. Agricultural Soil Mechanics. Springer-Verlag ISBN 13:978- 3-642-69012-9.
- McKyes E. 1989. Agricultural Engineering Soil Mechanics, Elsevier science publishers B.V., P.O. Box 211, 1000 AE Amsterdam, the Netherlands.
- McKyes E. 2016. Soil Cutting and Tillage: Vol 7. Developments in Agricultural Engineering Elsevier R Science Publisher SBV.
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