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Full Description
Engineers not only need to understand the basics of how fluid power components work, but they must also be able to design these components into systems and analyze or model fluid power systems and circuits. There has long been a need for a comprehensive text on fluid power systems, written from an engineering perspective, which is suitable for an undergraduate-level course in fluid power.
Fluid Power Circuits and Controls: Fundamentals and Applications encourages students to think of the collection of components as a system. The author illustrates each concept with a circuit diagram, and as each component is discussed, immediately places it in a circuit and analyzes its performance. This approach allows students to immediately apply what they have learned and encourages them to think about how the component operating characteristics interact with the rest of the circuit.
Covering all aspects of the industry, this book:
Develops the basic concept for power delivery with fluids
Reviews basic concepts of fluid mechanics and discusses the key properties of the fluids
Discusses the creation and control of flow and the various methods used to control pressure in a circuit
Provides a detailed example of the classic problem of hydrostatic transmission design
Presents characteristics of auxiliary components and applicable SAE standards
Addresses pneumatics, focusing on the difference in power transmission for liquid and gas
Discusses servo valves and proportional valves without requiring a background in automatic controls
The text is richly illustrated, filled with fully worked example problems, and reinforced with exercises in each chapter. Fluid Power Circuits and Controls offers valuable design experience and the background its readers need to approach real-world fluid power problems with confidence.
Contents
Preface
BRIEF OVERVIEW OF FLUID POWER
Introduction
Concept of Fluid Power
Summary
FLUID POWER BASICS
Introduction
Fluid Statics
Functions of a Working Fluid
Fluid Properties
Flow in Lines
Leakage Flow
Orifice Equation
Summary
Data Selected for Hydraulic Fluids
PRESSURE CONTROL
Introduction
Review of Needed Symbols
Relief Valve
Unloading Valve
Sequence Valve and Pressure-Reducing Valve
Counterbalance Valve and Brake Valve
Summary
CREATION AND CONTROL OF FLUID FLOW
Introduction
Fixed Displacement Pumps
Fixed Displacement Pump Circuits
Variable Displacement Pump Circuits
Comparison of Pump Performance Characteristics for Three Main Designs
Multiple Pump Circuits
Pump Mounts
Flow Control Valves
Circuits Using Flow Control Valves
Summary
ROTARY ACTUATORS
Introduction
Stall Torque Efficiency
Typical Performance Data for a Gear motor
Comparison of Motor Performance Characteristics for Three Main Designs
Performance Characteristics of Low-Speed, High-Torque Motors
Design Example for Gear Motor Application
Interaction of Pump and Motor Characteristics
Bent Axis motors
Radial Piston motors
Motor-Gearbox Combinations
Oscillating Actuator
Summary
Curve Fitting Technique
HYDROSTATIC TRANSMISSIONS
Introduction
Mechanical Transmissions
Introduction to Hydrostatic Transmissions
Hydrostatic Transmissions for Vehicle Propulsion
Different Configurations of Hydrostatic Transmissions to Propel Vehicles
Classification of Hydrostatic Transmissions
Closed-Circuit Hydrostatic Transmissions
Closed-Circuit, Closed-Loop Hydrostatic Transmissions
Hydrostatic Transmission Design
Summary
Basic Concepts in Traction
Selected Catalog Data for Hydrostatic Transmission Design Problems
LINEAR ACTUATORS
Introduction
Analysis of Cylinders in Parallel and Series
Synchronization of Cylinders
Cushioning
Rephasing of Cylinders
Presses
Load Analysis
Types of Cylinders
Cylinder Construction
Summary
TEMPERATURE AND CONTAMINATION CONTROL
Introduction
Temperature Control
Contamination Control
Summary
AUXILIARY COMPONENTS
Introduction
Reservoir
Hydraulic Lines
Fluid Velocity in Conductors
Options for Connecting Components
Installation of Lines
Design Life of Components
System Integration
Summary
Selected Design Data for Fluid Conductors
PNEUMATICS
Introduction
Orifice Equation
Compressors
Receiver
Pipelines
Preparation of Compressed Air
Cylinders
Motors
Additional Actuator Units
Valves
Summary
Standard Conditions
SERVO VALVES
Introduction
Concept
Servo Valve Construction
Valve Performance
Types of Servo Systems
Servo Amplifiers
Servo Analysis
Summary
PROPORTIONAL VALVES
Introduction
Types of Proportional Valves
Analysis of Proportional Directional Control Valve
Comparison of Servo and Proportional Valves
Summary
Summary of Equations
Index
