TILLAGE, TRACTION & LAND DEVELOPMENT
MACHINERY
AE …
Lecture : 3 Year : IV
Tutorial : 1 Part : II
Practical : 1.5
Course Objective:
The
primary objective of this course is to introduce tillage, traction devices and
land development machinery used in Agricultural Engineering activities in
farms. Secondly this course introduces soil properties, soil-tillage-tool
mechanics and traction theory associated with such technologies that used in
agricultural works.
1.
Introduction [4 hours]
1.1. Soil physical conditions
required for plant growth
1.2. Role of cultivation in
producing favorable tilth
1.3. Basic soil
manipulations:
1.3.1. Cutting and loosening
1.3.2. Disintegration
1.3.3. Inversion
1.3.4. Mixing
1.3.5. Compaction
1.3.6. Smoothening
2.
Dynamic Soil Properties
and their Measurement [5 hours]
2.1. Cohesion
2.2. Shear and compressive
strength
2.3. Stress – strain behavior
2.4. Theories of soil failure
3. Mechanics and Geometry of Soil Tool System [7 hours]
3.1. Determination of passive
earth pressure
3.2.
Application of passive earth pressure in design of soil engaging
tools
3.3.
Effects of rake angle of soil failure pattern
3.4.
Shallow and deep tine concept
3.5.
Soil compaction by agricultural machines
4.
Mechanics of Rotatory Tillage Tools [4 hours]
4.1. Action of rotatory tillage tools
4.2. Design parameters of
rotatory tillage tools:
4.2.1. Length of cut
4.2.2. Bite length
4.2.3. Ratio of peripheral and
forward speeds
4.3. Performance of rotatory
tillage tools
5.
Land Packers and Clod
Crushers [4 hours]
5.1.
Functions of land packers and clod crushers
5.2.
Design parameters of land packers and clod crushers
5.3.
Performance of land packers and clod crushers
6.
Zero Tillage and Minimum
Tillage Tools [4 hours]
6.1.
Mechanics of zero tillage and minimum tillage
6.2.
Design parameters and working principle
6.3.
Performance of zero tillage
and minimum tillage tools
7.
Soil Wheel Interaction [8 hours]
7.1.
Mechanics of traction device
7.2.
Rolling resistance and tractive effort
7.3.
Driven and steered wheels
7.4.
Coefficient of traction
7.5.
Drawbar pull and rim pull
7.6.
Traction aids
7.7.
Tyres- functions, size and selection
7.8.
Crawlers mounted and wheel mounted machinery
8.
Bulldozers [3 hours]
8.1.
General information
8.2.
Crawler mounted versus wheel mounted bulldozers
8.3.
Earth moving with bulldozers
8.4.
Output of bulldozers
9.
Scrapers [3 hours]
9.1.
General information
9.2.
Types and sizes
9.3.
Operating efficiency of scraper
9.4.
Performance of wheel type scraper
10.
Excavating Equipments [3 hours]
10.1.
Power shovel- general information and basic components
10.2.
Size and working principle of power shovel
10.3. Effect
of depth of cut and job conditions on performance of power shovel
10.4.
Dragline- general information and basic components
10.5.
Types of draglines
10.6.
Effect of depth of cut and angle of swing on output
Practicals:
1.
Study on soil engaging components of agricultural machines
2.
Determination of effect of moisture content on dynamic properties
of soil
3.
Determination of clod mean weight diameter
4.
Calculation of passive earth pressure using different models
5.
Familiarization with different land development machineries
6.
Study on bulldozer with references to blade size and output
7.
Study on different types of scrapers and levellers
References:
1.
E. McKeys. 1985. Soil
Cutting and Tillage. Elsevier, Tokyo
2.
Soil Dynamics in Tillage
and Traction. USDA Publication.
3.
Sineokov, G. N. Design of
Soil Tillage Machines. Indian National Scientific Documentation Center,
Hillside Road, New Delhi.
Evaluation Scheme:
The
questions will cover all the chapters in the Syllabus. The evaluation scheme
will be as indicated in the table below.
Chapter
|
Hours
|
Marks Distribution*
|
1
|
4
|
12
|
2
|
5
|
3
|
7
|
12
|
4
|
4
|
8
|
5
|
4
|
8
|
6
|
4
|
8
|
7
|
8
|
16
|
8
|
3
|
16
|
9
|
3
|
10
|
3
|
Total
|
45
|
80
|
*
Minor deviation on mark distribution can be made.
Source:-Department of Agricultural Engineering
He is now currently working as a officer at The Eastern Regional Agricultural Extension Center (Agriculture Extention Officer in Jhumka, training centre, MOAC). He has passed the Bsc Ag from the Institute of Agriculture and Animal Science under the Tribhuvan University.
