Equivalent viscous damping ratio

Assuming sinusoidal response, such as

and, substituting into Equation 1, you get:

	Equation 4

The equivalent viscous damping is thus

	Equation 5

and if

Equation 5 can be rewritten as

	Equation 6

We can thus calculate the equivalent viscous damping ratio as

	Equation 7

Look up more details

Modal hysteretic and viscous damping ratios

Rayleigh's damping method

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