Damping coefficient in damping mechanisms

[Vaggelis]

Hello everyone,

I am trying to design an element that its purpose is providing stiffness and damping. The material that I wish to use is rubber.

My question is, how can we calculate the damping coefficient (c) for the calculation of the term c*dx/dt, when we know the loss factor of the material (for example η=0.075 for rubber) and the geometry of the element is defined.

Thanks in advance.

Vaggelis

 

[drvrm]

My question is, how can we calculate the damping coefficient (c) for the calculation of the term c*dx/dt, when we know the loss factor of the material (for example η=0.075 for rubber) and the geometry of the element is defined.

i remember to have used a damped oscillator and c can be estimated experimentally. one can see the following for measurement...
http://www.engineeringmechanics.cz/pdf/14_1_013.pdf