Closed loop performance depends on valve and cylinder – Hydraulic Natural Frequency fh (simplified as a mass-spring model) C: Spring Constant of Fluid under Compression…
– Closed Loop Hydraulic Response Could Be Tested – fh = Number of Oscillations per Second – T = Time for one cycle (sec) –…
Valve Matrix & Project Worksheet (suitable for Hyvos simulation)
Closed Loop means automatic regulation of – Position – Force – Pressure – Velocity – Etc… Constant correction occurs from error generated
Gain – Changes input vs. output ratio – Limits maximum output Zero (Null) – Offsets spool into a “0” hydraulic condition due to manufacturing tolerances…
Dither is used to create a PWM signal on proportional amplifiers Servo valve amplifiers do not require PWM, so a dither signal (sine wave) adds…
PWM adjusts the average output power to a DC prop. solenoid by switching a fixed DC voltage on-off On vs. Off time varies, within a…
Linearizes valve output Optimized for specific valve type