So I’ve done an experiment using solenoid valves controlled by an Arduino to move a hydraulic actuator. The experiment was for the movement of the actuator to match a sinusoidal input produced from a signal generator.
Looking at the picture below you can see the red real response vs the blue input at three different frequencies. Can anyone tell me why the response maintains a constant amplitude at each frequency but its mean value keeps on shifting up and down in a sinusoidal path, does anyone know what this means?
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