Question

Difference between coulomb damping and viscous damping

Answer 1

Rate of Decay of oscillation: Let 1A be the amplitude of body from mean position to start and after half cycle. ... In case of viscous damping ratio of any two successive amplitudes is constant whereas in coulomb damping difference between two successive amplitudes is constant.

Answer 2

Difference between coulomb damping and viscous damping  is as follows:

• In the type of constant mechanical damping, via sliding friction energy is absorbed, this is defined as coulomb damping.
• Viscous damping occurs at that time when constant magnitude force resists a particle in a vibrating system.
• Any two successive amplitudes' ratio of viscous damping is constant and in the other side, in case of coulomb damping difference in two successive amplitudes is constant.