Fluid Power Circuits and Controls

Fundamentals and Applications, Second Edition

John S. Cundiff, Michael F. Kocher

• Publisher: CRC Press
• Year: 2019
• ISBN:
  9781498770033
• Edition: 2
• Topic: Technology & Engineering
• Subtopic: Mechanical Engineering
• Index: Technology & Engineering

Fluid Power Circuits and Controls: Fundamentals and Applications, Second Edition, is designed for a first course in fluid power for undergraduate engineering students. After an introduction to the design and function of components, students apply what they've learned and consider how the component operating characteristics interact with the rest of the circuit. The Second Edition offers many new worked examples and additional exercises and problems in each chapter. Half of these new problems involve the basic analysis of specific elements, and the rest are design-oriented, emphasizing the analysis of system performance. The envisioned course does not require a controls course as a prerequisite; however, it does lay a foundation for understanding the extraordinary productivity and accuracy that can be achieved when control engineers and fluid power engineers work as a team on a fluid power design problem. A complete solutions manual is available for qualified adopting instructors.

1 Brief Overview of Fluid Power

1.1 Introduction

In 1906, oil began to replace water as the pressurized fluid in hydraulic systems, and the modern era of fluid power began. Electrical control of fluid power began to enter the commercial sector with the development of servo valves in World War II. Today, the fluid power industry is a multi-billion dollar industry.

Most mobile machines in the extraction industries (mining, logging, farming, and fishing) have fluid power circuits, thus fluid power is a major factor in the collection of raw materials for the international economy. Fluid power is an important part of most vehicles in the transportation industry. In manufacturing, the application of fluid power has continuously increased the productivity of workers and thus has had direct impact on the standard of living. Today, fluid power is a part of every product we use and service we enjoy.

1.2 Concept of Fluid Power

This text leads the reader through several levels of complexity beginning with simple circuits with a simple function and concluding with an introduction to the use of servo valves to control heavy loads moving at high speed. As we proceed along this journey, the reader will be periodically reminded that the fundamental concept of fluid power is quite simple. Fluid power technology is the conversion of mechanical energy to fluid energy, delivery of this energy to a utilization point, and then its conversion back to mechanical energy. A fluid power circuit has all three features: conversion from mechanical energy to fluid energy, delivery, and conversion from fluid energy back to mechanical energy. An electrical circuit also has all three features, but often the designer focuses only for the final conversion step—electrical-to-mechanical. Generation of the electrical energy and its delivery are external to the design problem.

1.2.1 Basic Circuits

Many people have an intuitive understanding of a basic cylinder circuit and a basic motor circuit. The block diagram shown in Figure 1.1 gives the concept for a motor circuit. Two parameters, torque (T) and shaft speed (N), are converted to two different parameters, pressure (P) and f...

Table of contents

• Cover
• Half Title
• Series Page
• Title Page
• Copyright Page
• Dedication Page
• Table of Contents
• Preface
• Appreciation
• Authors
• Chapter 1 Brief Overview of Fluid Power
• Chapter 2 Fluid Power Basics
• Chapter 3 Pressure Control
• Chapter 4 Creation and Control of Fluid Flow
• Chapter 5 Rotary Actuators
• Chapter 6 Hydrostatic Transmissions
• Chapter 7 Linear Actuators
• Chapter 8 Temperature and Contamination Control
• Chapter 9 Auxiliary Components
• Chapter 10 Pneumatics
• Chapter 11 Proportional Valves
• Chapter 12 Servo Valves
• Index