Hydraulic and Electro-Hydraulic Control Systems

1. Front Matter

   Pages i-ix

   PDF

2. Introduction

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   Pages 1-2

3. Hydraulic Power Source

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   Pages 3-7

4. Working Pressures

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   Pages 8-9

5. Hydraulic Actuators

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   Pages 10-12

6. Control Elements

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   Pages 13-24

7. Data Transmission Elements

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   Pages 25-29

8. The Control System

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   Pages 30-41

9. Control Concepts

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   Pages 42-54

10. Principles of Flow Control for Valve-Operated Systems: Part 1

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    Pages 55-65

11. Principles of Flow Control for Valve-Operated Systems: Part 2

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    Pages 66-78

12. Introduction to System Analysis

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    Pages 79-87

13. System Analysis of Electro-hydraulic Control Systems

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    Pages 88-96

14. Modular Optimized System Simulation

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    Pages 97-108

15. System Analysis in the Time Domain

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    Pages 109-118

16. Transient Response Characteristics

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    Pages 119-128

17. Further Case Studies

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    Pages 129-151

18. Non-symmetrical Systems

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    Pages 152-162

19. Response to Large Step Demand

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    Pages 163-168

20. Valve Operating Forces

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    Pages 169-172

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 at fractional horsepower level. A further, and frequently range, specifically 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.

• Standard
• data transmission
• network
• simulation
• system
• system analysis
• transmission

• Engineering Consultant, Wembley, UK

  R. B. Walters

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