Is used to characterise the dynamic behaviour of devices in hydraulics, above all of proportional valves and servo valves.
In the Bode diagram the amplitude response and phase-frequency response are shown together graphically as a function of the logarithm of the circular frequency ω or the frequency f (Figure B 22).
Based on the Bode diagram for a controlled subsystem it is straightforward to find a controller with which a stable control circuit can be assembled.
Figure B 22: Bode diagram for a proportional valve