Hydraulic power system analysis / Arthur Akers ... [et al.].

Enhanced descriptions from Syndetics:

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 provided by Syndetics

• 1 Introduction (p. 1)
• 1.1 What Is Fluid Power? (p. 1)
• 1.2 A Brief History of Fluid Power (p. 2)
• 1.3 Fluid Power Applications, Present and Future (p. 3)
• 1.4 Advantages of Using Fluid Power Systems (p. 4)
• 1.5 A Probable Future Development (p. 5)
• 2 Properties of Fluids and Their Units (p. 7)
• 2.1 Basic Properties of Fluids (p. 7)
• 2.1.1 Example: Conversion Between Viscosity Units (p. 11)
• 2.2 Compressibility of Liquids (p. 12)
• 2.2.1 Example: Bulk Modulus of Multiple Containers (p. 17)
• 2.2.2 Example: The Oil Spring (p. 22)
• 3 Steady State Modeling (p. 31)
• 3.1 Rationale for Model Development (p. 31)
• 3.2 Source of Equations (p. 32)
• 3.3 Conservation of Flow and Energy (p. 34)
• 3.4 Friction Losses in Pipes and Fittings (p. 36)
• 3.5 Basic Component Equations (p. 38)
• 3.6 Worked Examples (p. 40)
• 3.6.1 Example: Oil Temperature Rise in a Hydrostatic Transmission System (p. 41)
• 3.6.2 Example: A Pump Driving a Motor (p. 44)
• 3.6.3 Example: Using International System Units (SI) (p. 49)
• 3.6.4 Example: Incorporating Pump and Motor Efficiency Values (p. 52)
• 3.6.5 Example: Performance of a Flow Regulator Valve (p. 56)
• 3.6.6 Example: Using an Accumulator (p. 60)
• 3.7 Discussion (p. 67)
• 4 Dynamic Modeling (p. 77)
• 4.1 Development of Analytical Methods (p. 77)
• 4.2 Software Options (p. 78)
• 4.2.1 Equation Solutions (p. 78)
• 4.2.2 Graphical Solutions (p. 79)
• 4.2.3 Fluid Power Graphical Symbol Solutions (p. 79)
• 4.3 Dynamic Effects (p. 79)
• 4.3.1 Fluid Compliance (p. 80)
• 4.3.2 Newton's Second Law Effects (p. 81)
• 4.4 Worked Examples (p. 82)
• 4.4.1 Example: Actuator Controlled by a Servovalve (p. 82)
• 4.4.2 Example: Hydromechanical Servo (p. 89)
• 4.5 Modeling Hints and Tips (p. 95)
• 4.6 Discussion (p. 98)
• 5 Linear Systems Analysis (p. 101)
• 5.1 Introduction (p. 101)
• 5.2 Linear Systems (p. 102)
• 5.3 The Laplace Transform (p. 102)
• 5.4 Inversion, the Heaviside Expansion Method (p. 109)
• 5.4.1 Repeated Roots in Practice (p. 113)
• 5.4.2 Worked Example of Inversion (p. 114)
• 5.5 Stability (p. 115)
• 5.6 Block Diagrams (p. 116)
• 5.6.1 Consolidation of Block Diagrams (p. 118)
• 5.6.2 Block Diagram for a Spring-Mass-Damper System (p. 119)
• 5.7 Spring-Mass-Damper Time Response to Unit Step Force (p. 121)
• 5.8 Time Constant (p. 125)
• 6 Frequency Response and Feedback (p. 133)
• 6.1 Introduction (p. 133)
• 6.1.1 Heuristic Description (p. 134)
• 6.2 Mathematics of Frequency Response (p. 134)
• 6.3 Frequency Response Diagrams (p. 136)
• 6.4 Using Frequency Response to Find Controller Gain (p. 145)
• 6.4.1 Example: Hydromechanical Servo Revisited (p. 147)
• 6.5 Summary (p. 158)
• 7 Valves and Their Uses (p. 163)
• 7.1 Introduction (p. 163)
• 7.2 Directional Control Valves (p. 164)
• 7.2.1 Flow Force on a Spool (p. 167)
• 7.2.2 Analysis of Spool Valves (p. 170)
• 7.2.3 Linearized Valve Coefficients (p. 172)
• 7.2.4 Example: Using the Valve Coefficients (p. 174)
• 7.2.5 Comments on the Worked Example (p. 178)
• 7.3 Special Directional Control Valves, Regeneration (p. 180)
• 7.4 Flapper Nozzle Valve (p. 182)
• 7.5 Flow Control Elements (p. 185)
• 7.6 Relief Valves (p. 187)
• 7.6.1 Direct Acting Type (p. 187)
• 7.6.2 Pilot Operated Type (p. 189)
• 7.7 Unloading Valve (p. 189)
• 7.8 Pressure Reducing Valve (p. 191)
• 7.9 Pressure Sequencing Valve (p. 193)
• 7.10 Counterbalance Valve (p. 195)
• 7.11 Flow Regulator Valve (p. 198)
• 8 Pumps and Motors (p. 209)
• 8.1 Configuration of Pumps and Motors (p. 209)
• 8.2 Pump and Motor Analysis (p. 218)
• 8.2.1 Example: Drive for a Hoist (p. 220)
• 8.3 Leakage (p. 221)
• 8.3.1 Example: Estimating Pump Performance Coefficient C[subscript s] (p. 224)
• 8.4 Form of Characteristic Curves (p. 225)
• 8.4.1 Volumetric Efficiency (p. 225)
• 8.4.2 Torque Efficiency (p. 227)
• 8.4.3 Example: Estimating Motor Performance (p. 231)
• 8.4.4 Overall Efficiency (p. 232)
• 9 Axial Piston Pumps and Motors (p. 241)
• 9.1 Pressure During a Transition (p. 241)
• 9.1.1 Simulation of the Pressure Transition (p. 243)
• 9.1.2 Results of the Simulation (p. 245)
• 9.2 Torque Affected by Pressure Transition - Axial Piston Pump (p. 248)
• 9.2.1 Effect on Torque if the Pressure Change at Transition Is not Immediate (p. 250)
• 9.3 Torque and Flow Variation with Angle for Multicylinder Pumps (p. 251)
• 9.3.1 Noise (p. 254)
• 10 Hydrostatic Transmissions (p. 257)
• 10.1 Introduction (p. 257)
• 10.2 Performance Envelope (p. 259)
• 10.3 Hydrostatic Transmission Physical Features (p. 261)
• 10.4 Hydrostatic Transmission Dynamic Analysis (p. 262)
• 10.4.1 Example: The Soil Bin Drive (p. 266)
• 10.4.2 Final Comments on the Soil Bin Example (p. 269)
• 11 Pressure Regulating Valve (p. 277)
• 11.1 Purpose of Valve (p. 277)
• 11.2 Operation of Valve (p. 278)
• 11.3 Mathematical Model of Valve (p. 280)
• 11.4 Effect of Damping (p. 283)
• 11.4.1 Example: Solution of Model (p. 285)
• 12 Valve Model Expansion (p. 291)
• 12.1 Basic Valve Model (p. 291)
• 12.2 Model Expansion (p. 293)
• 12.2.1 Example: Solution of Model (p. 296)
• 12.3 An Assessment of Modeling (p. 298)
• 13 Flow Division (p. 299)
• 13.1 Introduction (p. 299)
• 13.2 The Hydraulic Ohm Method (p. 299)
• 13.3 Brief Review of DC Electrical Circuit Analysis (p. 300)
• 13.3.1 Methods of Solving DC Networks (p. 301)
• 13.3.2 Motor and Resistance Equivalence (p. 303)
• 13.4 Fluid Power Circuit Basic Relationships (p. 304)
• 13.5 Consolidation of Fluid Power Resistances (p. 307)
• 13.5.1 Example: Invariant Resistances (p. 308)
• 13.5.2 Example: Resistance Dependent on Flow (p. 311)
• 13.6 Application to Unsteady State Flow (p. 313)
• 13.6.1 Example: The Resistance Network Method Applied to Unsteady Flow (p. 315)
• 13.6.2 Example Results and Discussion (p. 322)
• 13.7 Conclusions (p. 329)
• 14 Noise Control (p. 335)
• 14.1 Introduction (p. 335)
• 14.2 Discussion of Method (p. 336)
• 14.3 Mathematical Model (p. 337)
• 14.3.1 Derivation of Fluid Analogies to Resistance, Inductance, and Capacitance (p. 338)
• 14.3.2 Example: Impedance (p. 344)
• 14.3.3 Development of a Lumped Parameter Model (p. 347)
• 14.3.4 Example: Curing Noise from Tractor Hydraulics (p. 350)
• 14.4 Effect of Entrained Air in Fluid (p. 352)
• 14.5 Further Discussion of the Mathematical Model (p. 353)
• 14.6 Other Methods of Noise Control (p. 353)
• 14.7 Damping Methods (p. 355)
• Index (p. 359)