Quote:
Originally Posted by bert
Another factor in designing a pier:
If you use a lot of mass to control damping, you will get a lot of thermal inertia, and that means local seeing effects as the pier stores heat and releases said heat through the night.
This pretty much precludes using concrete for a pier.
Like logie, I am a big fan of square section hollow piers, they are just easier to work with.
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The thermal mass of a pier is a significant issue. Concrete always bothers me and I was recently advised to fill my new pier with sand. Soooo much extra mass!
The system I am currently assembling has a 33cm diameter steel pier and to dampen this down I'll be using expansion foam... Next to nix mass/thermal retention, but past experience has shown it to be excellent in dampening vibration.
Cow of a problem all round really. Hot concrete slabs, massive equipment and then we wrap it all up in a metal dome/oven?
Quote:
Originally Posted by Kunama
With all this talk of resonances etc, I wonder how many of the imagers actually tap, kick, rap etc their piers during imaging ....................
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I stubbed my toe on mine ...... does that count?
