Module 8 : Free Vibration with Viscous Damping; Critical Damping and Aperiodic
                      Motion; Logarithmic Decrement; Systems with Coulomb Damping.
Lecture 3 : Logarithmic Decrement
Objectives
    In this lecture you will learn the following.
Concept of logarithmic decrement
Formulation of equation for logarthmic decrement.
Application of the concept.
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