Engineering Principles of Agricultural Machines 2nd Edition

Chapter 5
Fluid power, mechatronics, and control_________________ 91
Introduction...................................................................................................................91
5.1 
Basic Principles and Elements Of Fluid Power.............................................. 91
5.2 
Pumps...................................................................................................................92
5.3 
V alves..................................................................................................................96
5.3.1 
Pressure control valves............................................................................... 96
5.3.2 
Volume control valves............................................................................... 98
5.3.3 
Directional control valves..........................................................................99
5.4 
Actuators........................................................................................................... 102
5.4.1 
Hydraulic motors ......................................................................................102
5.4.2 
Hydraulic cylinders.................................................................................. 102
5.5 
Reservoirs, Fluids, Filters, and Lines............................................................104
5.6 
Types of Fluid Power Systems.......................................................................107
5.6.1 
Open-center systems................................................................................ 107
5.6.2 
Pressure-compensated system s............................................................... 109
5.6.3 
Load-sensing system s.............................................................................. 109
5.7 
Pressure Transients........................................................................................... 111
5.8 
Hydrostatic Transmissions.............................................................................. 112
5.9 
Mechatronics and System C ontrol................................................................ 114
5.9.1 
An introduction to mechatronics............................................................. 114
5.9.2 
System control.......................................................................................... 115
Problems...................................................................................................................... 117
Simulation Problems.................................................................................................. 121