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What happens to the phase lag in an actuator as the frequency is increased?

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What happens to the phase lag in an actuator as the frequency is increased?

(a) Increases

(b) Decreases

(c) Constant

(d) Cannot be determined

I had been asked this question by my school teacher while I was bunking the class.

Origin of the question is Control Laws in FBW topic in portion Fly by Wire Flight Control of Avionics

1 Answer

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Best answer
Right choice is (a) Increases

The best explanation: The response of the actuators at low frequencies is basically that of a low pass (or first-order) filter, but as the frequency increases the lags in the first stage actuation system become dominant. The output/input ratio falls at an increasing rate and the phase lag rapidly increases.

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