Calculate Damping using FFT

1. How do you calculate damping from a FRF?
2. How do you calculate damping value?
3. How is damping of structure calculated?

How do you calculate damping from a FRF?

The “quality factor” (also known as “damping factor”) or “Q” is found by the equation Q = f0/(f2-f1), where: f0 = frequency of resonant peak in Hertz.

How do you calculate damping value?

The critical damping coefficient (c_c) is twice the product of the mass (m) and natural frequency (ω_n) of the oscillating object: c_c = 2mω_n. So, find the product of the mass and natural frequency and multiply it by 2 to obtain the critical damping coefficient.

How is damping of structure calculated?

It characterizes the damping in a linear second-order system as the ratio of physical damping coefficient , over the critical damping coefficient ζ = d d c with d c = 2 m c m . This corresponds with the level of damping that the response becomes non-oscillatory.