Hydraulic and Electric-Hydraulic Control Systems

✍ Scribed by R. B. Walters (auth.)

• Publisher: Springer Netherlands
• Year: 2000
• Tongue: English
• Leaves: 343
• Edition: 2
• Category: Library

✦ Synopsis

Force and motion control systems of varying degrees of sophistication have shaped the lives of all individuals living in industrialized countries all over the world, and together with communication technology are largely responsible for the high standard ofliving prevalent in many communities. The brains of the vast majority of current control systems are electronic, in the shape of computers, microprocessors or programmable logic controllers (PLC), the nerves are provided by sensors, mainly electromech­ anical transducers, and the muscle comprises the drive system, in most cases either electric, pneumatic or hydraulic. The factors governing the choice of the most suitable drive are the nature of the application, the performance specification, size, weight, environ­ mental and safety constraints, with higher power levels favouring hydraulic drives. Past experience, especially in the machine tool sector, has clearly shown that, in the face of competition from electric drives, it is difficult to make a convincing case for hydraulic drives at the bottom end of the power range, specifically at fractional horsepower level. A further, and frequently overriding factor in the choice of drive is the familiarity of the system designer with a particular discipline, which can inhibit the selection of the optimum and most cost-effective solution for a given application. One of the objectives of this book is to help the electrical engineer overcome his natural reluctance to apply any other than electric drives.

✦ Table of Contents

Front Matter....Pages i-xi
Introduction....Pages 1-2
Hydraulic Power Source....Pages 3-7
Working Pressures....Pages 8-9
Hydraulic Actuators....Pages 10-12
Control Elements....Pages 13-24
Data Transmission Elements....Pages 25-29
The Control System....Pages 30-41
Control Concepts....Pages 42-54
Principles of Flow Control for Valve-Operated Systems: Part 1....Pages 55-65
Principles of Flow Control for Valve-Operated Systems: Part 2....Pages 66-78
Introduction to System Analysis....Pages 79-87
System Analysis of Electro-hydraulic Control Systems....Pages 88-96
Modular Optimized System Simulation....Pages 97-108
System Analysis in the Time Domain....Pages 109-118
Transient Response Characteristics....Pages 119-128
Further Case Studies....Pages 129-151
Non-symmetrical Systems....Pages 152-162
Response to Large Step Demand....Pages 163-168
Valve Operating Forces....Pages 169-172
The Electronic Interface....Pages 173-178
System Enhancement....Pages 179-199
Analysis of Pressure Control System....Pages 200-208
Efficiencies and Power Dissipation....Pages 209-215
Elastically Mounted Mass Systems....Pages 216-223
The Flow Feedback Option....Pages 224-229
Non-Linearities....Pages 230-236
Steady-State System Analysis....Pages 237-241
Applications....Pages 242-243
National and International Standards....Pages 244-244
Introduction....Pages 245-245
Structure....Pages 246-247
Modules....Pages 248-269
How to Get Started (Browsing)....Pages 270-271
Guided Tour (Tutorial Mode)....Pages 272-274
Worked Examples....Pages 275-280
Loop Gain Selection....Pages 281-282
Applying a Duty Cycle....Pages 283-284
Automatic Looping....Pages 285-286
System Enhancement....Pages 287-289
Graphics....Pages 290-290
Description of Graphs....Pages 291-324
Erratum to: Description of Graphs....Pages 332-332
Back Matter....Pages 325-331

✦ Subjects

Mechanics; Mechanical Engineering; Systems Theory, Control