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What is the use of mechanical lag damper?

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in Aerodynamics by (773k points)
What is the use of mechanical lag damper?

(a) Avoid ground instability

(b) Dampen the hub vibration

(c) Dampen the resonance in rotor blades

(d) Absorb instabilities in hinges and flap

The question was asked in semester exam.

This question is from Blades and Propellers in division Helicopter Dynamics of Aerodynamics

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The correct answer is (a) Avoid ground instability

The best I can explain: Articulated rotor makes use of lag hinge and with that it is essential to use a mechanical damper because there is mechanical instability which is generated due to the coupled motion of rotor lag and hub in-plane displacement. This is known as the ground resonance.

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