Hydraulic Power System Analysis: 1st Edition (Hardback) book cover

Hydraulic Power System Analysis

1st Edition

By Arthur Akers, Max Gassman, Richard Smith

CRC Press

400 pages | 137 B/W Illus.

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Hardback: 9780824799564
pub: 2006-04-17
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The excitement and the glitz of mechatronics has shifted the engineering community’s attention away from fluid power systems in recent years. However, fluid power still remains advantageous in many applications compared to electrical or mechanical power transmission methods. Designers are left with few practical resources to help in the design and analysis of fluid power systems, especially when approaching fluid power for the first time.

Helping you overcome these hurdles, Hydraulic Power System Analysis demonstrates modern computer-aided analytical techniques used to model nonlinear, dynamic fluid power systems. Following an overview of fluid power, the authors examine various relevant fluid properties, energy calculations, and steady state and dynamic analysis along with a review of automatic control theory. Turning to modeling, the next few chapters address valves and motors and then apply dynamic modeling to examples relating to pumps, hydrostatic transmissions, and valves. The book includes a unique chapter showing how to combine flow resistance equations with the differential equations governing dynamic system performance. The final chapter translates electrical circuit theory concepts to noise attenuation in fluid power systems.

Illustrated with many equations, practical computer modeling examples, and exercises, Hydraulic Power System Analysis provides a much-needed modernization of dynamic modeling for fluid power systems using powerful computational tools.

Table of Contents


What Is Fluid Power?

A Brief History of Fluid Power

Fluid Power Applications, Present and Future

Advantages of Using Fluid Power Systems

A Probable Future Development

Properties of Fluids and Their Units

Basic Properties of Fluids

Compressibility of Liquids

Steady State Modeling

Rationale for Model Development

Source of Equations

Conservation of Flow and Energy

Friction Losses in Pipes and Fittings

Basic Component Equations

Worked Examples


Dynamic Modeling

Development of Analytical Methods

Software Options

Dynamic Effects

Worked Examples

Modeling Hints and Tips


Linear Systems Analysis


Linear Systems

The Laplace Transform

Inversion, the Heaviside Expansion Method


Block Diagrams

Spring-Mass-Damper Time Response to Unit Step Force

Time Constant

Frequency Response and Feedback


Mathematics of Frequency Response

Frequency Response Diagrams

Using Frequency Response to Find Controller Gain


Valves and Their Uses


Directional Control Valves

Special Directional Control Valves, Regeneration

Flapper Nozzle Valve

Flow Control Elements

Relief Valves

Unloading Valve

Pressure Reducing Valve

Pressure Sequencing Valve

Counterbalance Valve

Flow Regulator Valve

Pumps and Motors

Configuration of Pumps and Motors

Pump and Motor Analysis


Form of Characteristic Curves

Axial Piston Pumps and Motors

Pressure During a Transition

Torque Affected by Pressure Transition — Axial Piston Pump

Torque and Flow Variation with Angle for Multicylinder Pumps

Hydrostatic Transmissions


Performance Envelope

Hydrostatic Transmission Physical Features

Hydrostatic Transmission Dynamic Analysis

Pressure Regulating Valve

Purpose of Valve

Operation of Valve

Mathematical Model of Valve

Effect of Damping

Valve Model Expansion

Basic Valve Model

Model Expansion

An Assessment of Modeling

Flow Division


The Hydraulic Ohm Method

Brief Review of DC Electrical Circuit Analysis

Fluid Power Circuit Basic Relationships

Consolidation of Fluid Power Resistances

Application to Unsteady State Flow


Noise Control


Discussion of Method

Mathematical Model

Effect of Entrained Air in Fluid

Further Discussion of the Mathematical Model

Other Methods of Noise Control

Damping Methods


About the Series

Fluid Power and Control

Learn more…

Subject Categories

BISAC Subject Codes/Headings:
SCIENCE / Mechanics / General