Hydraulic Power System Analysis demonstrates modern computer-aided analytical techniques used to model nonlinear, dynamic fluid power systems.

Features:

• Treats fluid power system modeling at a level ideally suited to design engineers with limited knowledge of fluid power
• Emphasizes a clear division between steady state and dynamic modeling
• Reviews the basic features of automatic control theory and introduces noise reduction for fluid power systems
• Discusses bulk modulus related to entrained air and flexible hoses, explaining adverse dynamic effects
• Combines dynamic analysis of flow allocation and explores the dynamics involved in flow division in the circuit

Contents

Introduction

• What Is Fluid Power?
• 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
• Stability
• 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
• Leakage
• 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

Index

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