|Viscous damping||Coulomb damping|
|1] In case of viscous damping, the ratio of 2 successive amplitudes was constant and envelope of maximas of displacement time curve was exponential curve.||1] In case of coulomb damping, the difference between any 2 successive amplitudes is constant and envelope of maximas of displacement time curve was straight line.|
|2] In viscous damping, the system once disturbed from mean equilibrium position then finally it comes to rest in equilibrium position only and theoretically it takes $\infty$ time.||2] In coulomb damping,the body may finally come to rest in equilibrium or in displaced position depending upon the initial amplitude and amount of friction present.|
|3] Damping force is proportional to the velocity.||3] Coulomb's damping force is independent of velocity but depends on the co efficient of friction.|
|4] In viscous under damping system mass oscillates about the same mean position.||4] Mean position about which mass oscillates varies with each half cycle.|
Difference between viscous damping and coulomb damping.