Viscous Damping

Savithri

Most books that deal with vibration, shock etc. deal with the viscous damping term broadly. Is there a source that tells you how to go about calculating the coefficient of viscous damping. I have come across numerous articles that plot various parameters as a function of eta (viscous damping/critical viscous damping, i.e. C/Cc). For example, if a plate is hinged at two points and is vibrating in a package that has still air, is it possible to calculate the contibtion of damping due to the air?

Any suggestions would be greatly appreciated.

Regards. Savithri