Hydraulic fluid power : fundamentals, applications, and circuit design /: fundamentals, applications, and circuit design. (2020)

• Record Type: Book
• Further Information: Note: Andrea Vacca, Germano Franzoni.
• Authors: Vacca, Andrea; Franzoni, Germano, 1976-
• Contents: PART I:Fundamental principles4 Objectives4 CHAPTER 1:Introduction to hydraulic control technology6 Historical perspective7 Fluid power symbology and its evolution12 Common ISO Symbols16 Problems25 CHAPTER 2:Hydraulic fluids28 Ideal vs. Actual hydraulic fluids28 Classification of hydraulic fluids31 Mineral oils (H)32 Fire resistant fluids (HF)33 Synthetic fluids (HS)34 Environmentally friendly fluids34 Water hydraulics34 Comparisons between hydraulic fluids35 Physical properties of hydraulic fluids36 Fluid compressibility: Bulk Modulus Fluid density38 Fluid viscosity42 Viscosity as a function of temperature43 Viscosity as a function of pressure47 Entrained air, gas solubility and cavitation48 Entrained air48 Gas solubility48 Equivalent properties of liquid-air mixtures50 Contamination in hydraulic fluids57 Considerations on hydraulic filters59 Filter placement64 Considerations on hydraulic reservoirs68 Tank volume68 Basic design of a tank69 Problems71 CHAPTER 3:Fundamental Equations73 Pascal’s law73 Basic law of fluid statics74 Volumetric flow rate77 Conservation of mass80 Application to a hydraulic cylinder81 Bernoulli’s Equation84 Generalized Bernoulli’s equation85 Major losses calculation87 Minor losses89 Hydraulic resistance90 Stationary modeling of flow networks92 Momentum equation96 Flow forces100 Problems106 CHAPTER 4(*):Orifice Basics111 The orifice equation111 Fixed and variable orifices115 Power loss in orifices117 Parallel and series connection of orifices119 Functions of orifices in hydraulic systems123 Orifices in pressure and return lines123 Orifices in pilot lines126 Problems131 CHAPTER 5:Dynamic Analysis of Hydraulic Systems134 Pressure build-up Equation - hydraulic capacitance134 Fluid inertia Equation - hydraulic inductance140 Modeling flow network – dynamic considerations146 Validity of the lumped parameter approach151 Further considerations on the line impedance model152 Damping effect of hydraulic accumulators153 Problems156 References160 PART II:Main hydraulic components4 Objectives5 CHAPTER 6 (**):Hydrostatic pumps and motors6 Introduction6 The ideal case7 General operating principle9 ISO symbols13 Ideal equations14 The real case16 Losses in pumps and motors17 Fluid compressibility17 Internal and external leakage20 Friction21 Other types of losses23 Volumetric and hydro-mechanical efficiency24 Trends for volumetric and hydromechanical efficiencies28 Design types34 Swashplate type axial piston machines35 Bent axis type axial piston machines38 Radial piston machines39 Gear machines40 Vane type machines43 Problems46 CHAPTER 7(*):Hydraulic cylinders50 Classification50 Cylinder analysis52 Ideal vs. real cylinder55 Problems61 CHAPTER 8(*):Hydraulic control valves63 Spring basics64 Check and shuttle valves65 Check valve65 Pilot operated check valve66 Shuttle valve67 Pressure control valves68 Pressure relief valve68 Direct acting pressure relief valve68 Pilot operated pressure relief valve72 Pressure reducing valve75 Direct acting pressure reducing relieving valve75 Pilot operated pressure reducing valve77 Flow control valves80 Two-way flow control valve80 Fixed displacement pump circuit with a two-way flow control valve83 Three-way flow control valve87 Fixed displacement pump circuit with a three-way flow control valve89 Directional control valves95 Meter-in and meter-out configurations97 Neutral position100 Actuation methods103 Servovalves107 Characteristic of servovalves112 Servovalves vs. proportional valves123 Problems126 CHAPTER 9(*):Hydraulic Accumulators132 Accumulator Types132 Weight loaded accumulators132 Spring-loaded accumulators132 Gas-charged accumulators133 Piston-type accumulators133 Diaphragm-type accumulators134 Bladder-type accumulators135 Operation of gas charged accumulators137 Typical applications138 Energy accumulation138 Emergency supply140 Energy recuperation140 Hydraulic suspensions140 Pulsation dampening – shock attenuation141 Equations and sizing142 Accumulator as energy storage device142 Accumulator as dampening device145 Problems151 References154 PART 3:Actuator control concepts3 Objectives3 CHAPTER 10 (*):Basics of actuator control5 Control methods: speed, force and position control5 Resistive and overrunning loads7 Power flow depending on the load conditions9 Problems11 CHAPTER 11:General concepts for controlling a single actuator13 Supply and control Concepts13 Flow supply – primary control18 Flow supply – metering control19 Flow supply – secondary control21 Pressure supply – primary control21 Pressure supply – metering control23 Pressure supply – secondary control25 Additional remarks26 CHAPTER 12:Regeneration with single rod actuators27 Basic Concept of regeneration27 Actual implementation32 Directional control valve with external regeneration valves32 Directional control valve with regenerative extension position33 Solution with automated selection of the regeneration mode34 Problems36 References38 PART 4:Metering controls for a single actuator3 Objectives3 CHAPTER 13:Fundamentals of metering control5 Basic meter-in and meter-out control principles5 Meter-in control Extension with resistive loads Retraction with overrunning loads Meter-out control10 Extension with resistive loads 14 Retraction with overrunning loads18 Remarks on meter-in and meter-out controls19 Actual metering control components36 Single spool proportional DCVs41 Independent metering control elements38 Usage of anti-cavitation valve for unloaded meter-out51 Problems49 CHAPTER 14:Load holding and counterbalance valves53 Load holding valves53 Pilot operated check valve61 Counterbalance valves60 Basic operating principle67 CBV architecture69 CBV detailed operation72 Effect of the pilot ratio and of the pressure setting83 Counterbalance valve with vented spring chambers85 Problems78 CHAPTER 15:Bleed-off and open center circuits80 Bleed-off circuit operation91 Energy analysis94 Basic open center system97 Operation98 Open center valve design101 Energy analysis102 Advanced open center control architectures106 Negative flow control106 Basic Schematic106 Operation107 Pump displacement setting mechanism110 Po
• Edition: First edition
• Publisher Details: Hoboken : John Wiley & Sons, Inc
• Publication Date: 2020
• Extent: 1 online resource
• Subjects: 621.2; Fluid power technology
• Languages: English
• ISBNs: 9781119569107; 9781119569138
• Related ISBNs: 9781119569114
• Notes: Note: Includes bibliographical references and index.; Note: Description based on CIP data; resource not viewed.
• Access Rights: Legal Deposit; Only available on premises controlled by the deposit library and to one user at any one time; The Legal Deposit Libraries (Non-Print Works) Regulations (UK).
• Access Usage: Restricted: Printing from this resource is governed by The Legal Deposit Libraries (Non-Print Works) Regulations (UK) and UK copyright law currently in force.