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 SLIDES- Introduction to Hydraulic Circuit Design Using Servo and Proportional Technology

Jack L Johnson, PE, BSEE
PUBLISHER: IDAS Engineering Inc, East Troy, WI, USA, 1998


DESCRIPTION:
This book is a compilation of the print-outs of more than 140 detailed slides that support the book:

 

DESIGNERS' HANDBOOK FOR
ELECTROHYDRAULIC SERVO AND PROPORTIONAL SYSTEMS


The slide book is printed and bound with two slides printed on the left-hand page, while the right-hand page is blank for note-taking. The student is relieved from the tedium of having to sketch figures, write equations and log copious notes. The student can concentrate on the presentation.  These are all the slides that are needed to teach a complete course on Servo & Proportional Electrohydraulic System Design.

 

It is a must for anyone wishing to teach the subject, either in a college classroom or in an industrial training program or in an industrial seminar.  The pace can be adjusted for a one-day program or as much as a full academic semester.  It depends on how much embellishment is provided by the instructor and now much homework is assigned and worked in class.

 


Table of Contents


I. OVERVIEW OF ELECTROHYDRAULIC MOTION CONTROL 1-32
The motion control diamond
Limitations of conventional hydraulic systems
Role of the motion profile
Role of the positional servomechanism
Power to propel the load - sizing the system
Bandwidth bottlenecks
Valve bandwidth
Hydromechanical resonant frequency
Error-bandwidth relationships
Total machine control
The Motion Control Star

II. CONTINUOUSLY VARIABLE, ELECTRICALLY MODULATED VALVES 33-71

Units of measure
Symbology
Kv, the valve coefficient vs rated flow
Servo and proportional valve definitions
Construction principles
Valve characteristics
Valve testing
Pressure metering
Valve and system disturbances
Valve characteristics and positioning quality
Servo loop errors
Valve "disturbances"
External "disturbances"

III. SYSTEM SIZING IN THE VCCM ENVIRONMENT 72-86

The VCCM equation
Operating envelope
Stall force
Slew speed
Extension vs retraction
Design points
Impending cavitation
Three scenarios
Two points on the operating envelope + 3 situations
One point on the operating envelope + 3 situations
"Testing", or verifying a given design + 2 situations
Valve shopping
Cavitation control
Maximum pressure control

IV. OTHER SERVO LOOP CLOSURE CONSIDERATIONS 87-110

Moving null diagrams
Dead band compensation myths & realities
Servo loop stability
Gain-stability compromise
Frequency response
Rules of thumb to ease calculations
Error-bandwidth criteria - The goals
Positioning error
Following error
Greater is the requirement
Hardware limitations - Keeping you from the goals
Valve bandwidth
Hydromechanical resonant frequency
Lesser is the limitation
Damping ratio
Valve
Hydromechanical
Mechanical friction
Valve internal leakage
Total
Closed loop System

V. ELECTRONICS FOR ELECTROHYDRAULIC MOTION CONTROL 111-141
DC power supply
Transistors and operational amplifiers
Servo amplifier
Pulse width modulation
Potentiometers
Dead band compensation
Asymmetrical gain
Proportional amplifier
Impedance matching and loading errors
Encoders
Incremental
Absolute
Resolution
Magnetostrictive position transducer
LVDT
Feedforward
Integral control
PI control
PID control
PIVFF control


 

 

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