Determining Damping Ratio for Spring-Damper System

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eolceroglu
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Hi, my question is about determining the damping ratio for the upper spring-damper part of the system given in the link. Is it still r2/(2*sqrt(k2*m2)) or something equivalent should be determined?
http://img217.imageshack.us/img217/3148/sprdampmass.png
Thank you!
 
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Please be more specific. I think the only damping constant is r2 and the time constant is either a simple ratio or product of k2 and r2.
 

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