I'm forced to wonder why on earth* they thought that this needed dampers anyway. In other centrifuge systems (the spin cycle of your washing machine is a good example) the uneven load causes vibration which needs to be damped. Surely though, the piss is a homogenous liquid and, therefore, will not produce asymmetric loading?
*This may be the answer of course. Testing the thing on earth would mean that gravity would cause the piss to tend towards the bottom of the drum producing an uneven load and vibration. Could they really have been dumb enough not to factor in that it would be operating in a zero-gravity environment and therefore not subject to this problem?