Selecting Vibration Dampers

Hi everyone,
I'm Sonia from Portugal and I'm a newbie Aeronautical engineer.

I'm searching some solution to absorb vibration. I'm trying to find materials and their properties to compare between them and chose one to design a vibration damper. Their application will be on the base of an avionics enclosure wich is onboard of a UAV (Unmanned Aerial Vehicle).

I'm the university, I learned mx''+cx'+kx=0, the free vibration equilibrium equation and all that stuff. But how should I search for a material wich have a good 'c'? Should I search for viscoelastic materials? I eared that ruber or cork are very good vibration absorbers, but how to quantify and compare it?

I would aprecciate some help... thanks in advance
Best regards
Sonia PireX