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Gday Geoff
Im also a mech engineer, and vibration analysis is not simple.
The strength and rigidity of the pier itself comes into it as well as the mass.
Just think of 2 tuning forks, one made of tuning fork steel and the other mild steel. Both may be almost identical in mass and shape, but will vibrate and damp very differently.
With a 273mm dia pier with 9.5 walls, you arent going to see much deflection in the pier under any normal circumstances, and as Al mentioned, if the vibration is from a "hit" then nothing will help.
As noted the idea of oil was to speed up the transfer of vibrational energy from the steel to the slurry, not to control the absolute amplitude or resonant freq.
Andrew
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