Are the viscous dampers containing silicon oil resistant to high/low temperatures (both in operation and at rest)?
Is there a lifetime for such dampers: do the properties of the silicon oil change with time?
Yes, there are change of properties of silicon oil in increase of temperature...
According to my personal opinion...
Viscous dampers should be designed and fabricated in order to be maintenance free during their anticipated lifetime, whereas subject to expected service condition .
Fluid viscous dampers can operate over an ambient temperature ranging from − 40 °C to 70 °C
Dear Dr. Tigran Parikyan, according to the information of a viscous damper supplier, the dynamic properties of the component does not change during its life cycle and the viscous damper is designed to have a lifetime higher than the engine itself.
The viscous damper properties will be compromised only if the operating temperature exceed the limit of the silicon oil (around 115 to 120 °C)
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