Engineering Principles of Agricultural Machines 2nd Edition

CONTENTS
Chapter 1
Agricultural Mechanization and Some Methods of Study 
1
Introduction..................................................................................................................... 1
1. 1 
History of Mechanized Agriculture.................................................................... 1
1.2 
Farming Operations and Related M achines......................................................3
1.3 
Functional Analysis of Agricultural Machines................................................. 4
1.3.1 
Basic processes of agricultural machines................................................... 5
1.3.2 
Process diagrams........................................................................................... 6
1.4 
Dimensional Analysis .......................................................................................... 7
1.4.1 
Scope.............................................................................................................. 7
1.4.2 
Physical dimensions...................................................................................... 7
1.4.3 
Units of measurement.................................................................................. 8
1.4.4 
Developing a prediction equation............................................................... 9
1.4.5 
Buckingham’s Theorem............................................................................. 10
1.4.6 
Systematic calculation of the dimensionless products.............................. 12
1.4.7 
Transformation of dimensionless products.............................................. 13
Problems........................................................................................................................ 14
Chapter 2
Engine Power for Agricultural Machines_________________15
Introduction...................................................................................................................15
2.1 
The power in fu e l............................................................................................... 15
2.2 
Combustion......................................................................................................... 16
2.2.1 
Combustion chemistry............................................................................... 16
2.2.2 
Energy release in combustion................................................................... 19
2.3 
Thermodynamic limits to Engine Performance.............................................. 21
2.4 
Heat Losses and Power at the Pistons............................................................. 25
2.5 
Mechanical Losses and Power at the Flywheel............................................... 26
2.6 
Engine Torque and Efficient Engine Loading................................................ 28
2.7 
Control of Engine Speed....................................................................................29
2.8 
Engine performance simulator.........................................................................33
2.9 
Turbocharging and Intercooling Engines........................................................35
2.9.1 
Operation of turbochargers........................................................................36
2.9.2 
Intercoolers................................................................................................. 39

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2.9.3 
Turbocharging and intercooling for versatility........................................39
Problems........................................................................................................................ 41
Simulation Problems.....................................................................................................43