Quote:
Originally Posted by Merlin66
Any finite analysis structural program given the correct inputs will quickly give you the deflections.
It's structurally a simple arrangement...much easier than building a bridge!!
(Having said that....I saw the calc sheets - logarithms/ slide rule in those days. And in the end they actually measured the end deflections under various loads and machined a bit more of the diameter of the stubs!!!! until they got to spec.)
|
Thanks. I don't have access to any programs so any data you have on just how much it deflected would be great to know.
talk of deflection, the Space Shuttle's "Twang" comes to mind, although not quite the same.
So they machined more of the central stub so it'd deflect more? I'm guessing to match the other half??
For us with a non structural background, its hard to imagine how the steel joints would act as a hinge and deflect, but I guess once you go big like the Hale and VLT, the deflection is to be expected.
From an amateur perspective, our pseudo serruriers just work off balance with the hub at the midpoint, in my case, I've used woven Carbon Fibre Truss nodes that are quite rigid and that's why I was keen on understanding the hinge concept as I don't know where there'd be scope for deflection due to compression and tension given our tiny load.
Being hand built with rudimentary tools, its nowhere near rigid as I'd like. I took inspiration from the Officina Stellar RC trusses.
we're all learning I guess. that's part of the fun.
Cheers
Alistair