Forced Vibrations | Coulomb Damped Free Vibrations | Alison
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Coulomb Damped Free Vibrations

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Coulomb Damped Free VibrationsWe have seen that the Damping in the structure can be modeled using Viscous Damping. So, in viscous damping, the damping force is proportional to the velocity of the system and the damping coefficient can be chosen, so that the energy dissipated by the viscous damper is equal to the energy dissipated by all energy dissipation mechanism in the structure. So, now, we will learn the different type of damping called Coulomb Damping, so let us see how coulomb damping works.(Refer Slide Time: 00:53)In coulomb damping, the energy dissipation is due to the friction between two sliding surfaces. So, the Coulomb Damped Free Vibration can be modeled as shown here.So, we have a mass and stiffness and the damping will be due to the friction between this mass and this surface; and the coefficient of friction in the surface is equal to mu(μ). So, the frictional force in the surface is equal to mu(μ) multiplied by N, when N is the normal force acting between these sliding surfaces. The direction of this frictional force will be equal to the opposite direction of the force.F =

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