Electrohydraulic Control Systems
Publisher: Bookboon
Published: 2016
ISBN-13: 9788740311877
Table of contents: title: Content; title: An introduction to the operation of electrohydraulic valves; title: Aim; title: Electrohydraulic valves, direction and pressure relief types; title: Electrohydraulic valves, the servodrive concept; title: Servovalve operation and design; title: Servovalve flow characteristics; title: Aim; title: Servovalve flow characteristics, critically-lapped spool; title: Servovalve flow characteristics, under-lapped spool; title: Valve rating; title: Servovalve specification by the manufacturer; title: Maximum power transfer to the load and selection of supply pressure; title: Connecting a servovalve to an actuator, steady-state behaviour; title: Aim; title: Connecting a servovalve to a cylinder, the open-loop steady-state behaviour; title: Connecting a servovalve to a motor, the open-loop steady-state behaviour; title: Connecting a servovalve to a motor, the closed-loop steady-state behaviour; title: Connecting a servovalve to a cylinder, the closed-loop position transient response; title: Servodrive damping, leakage and friction losses, efficiency; title: Improving the steady-state performance of an open-loop motor servodrive using a Programmable Servo Controller; title: System dynamics and computer simulation; title: Aim; title: Fluid compressibility and its effect on flow rate; title: Force and torque equations for actuators with moving mass or rotary inertia; title: Undamped natural frequency of an actuator; title: Actuator equations with losses and dynamics; title: Linearisation of the system equations; title: Pipe resistance, compressibility and inertia; title: Servovodrive open-loop linearised differential equation with losses and dynamics; title: Servovalve dynamics; title: The role of computer simulation; title: Laplace transforms, transfer functions, block diagrams, transient and frequency response; title: Aim; title: Laplace transforms; title: Transfer functions and block diagrams; title: Undamped natural frequency with connecting line effects; title: Transient response and its specification; title: Frequency response; title: The effect of a pure delay; title: Closed-loop stability; title: Aim; title: Closed-loop stability; title: The use of frequency response; title: Improving closed-loop behaviour; title: Aim; title: Some preliminary comments; title: The use of servoamplifier dither to improve steady-state error drift for a position control system; title: The effect of spool under-lap on the steady-state error for a position control system; title: Steady-state tracking error in response to a velocity demand for a position control system; title: Optimising the closed-loop transient response; title: Velocity sensing or Derivative computation; title: Additional acceleration, or pressure, feedback; title: Proportional+Integral+Derivative (PID) control; title: Gain scheduling using a PSC; title: Digital control algorithms using a PSC; title: Improving the dynamic performance of an open-loop motor servodrive using a PSC and pressure derivative feedback; title: Pressure and force control; title: Aim; title: Pressure control of a fixed-volume container; title: Force control of a servoactuator; title: Closing comments and further reading guidance