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Anonymous
Mathematical modeling 2017-03-14 10:20:09 Post No. 8746984
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Mathematical modeling 2017-03-14 10:20:09 Post No. 8746984
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Sup /sci/ - engineer-fag here, I need some help here
I need to come up with a mathetical model I can cram into mapple for a wonky little shape here
I just can't figure out how I'm supposed to do this.
its basically for a squished circle that has partially flattened out on the ground.
the top half is an ellipse 0.8 meters high, 2.25 meters to either side.
The bottom half is mainly a long flat stretch with circular ends that meet with the ellipse, radius 1 meter.
I need a mathematical model for this.
I know the model for a circle is (x-h)^2+(y-v)^2=r, with h and v being the horizontal and vertical center point coordinates.
For an ellipse its (x^2)/H + (y^2)/V=1, assuming its centered at (0,0)
how the fuck do I split that up I can model the thing in pic related?
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homeworks goes in >>>/hm/
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>>8746989
I think I'll pass on that - this board has "math" in the title, I'll stick to that
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>>8746984
Use two functions.
First, use an even degree polynomial to model the bottom
Then use an ellipse to model the top
Pic related.
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>>8747002
that is a great idea anon - however, I need a single formula for this thing, for a larger equation
its work related
>gotta figure out how much a tube shaped like is being strained when its filled with water
>formula to to calculate that requires a formula for the shape of the 'shell'
the formula is
T/P(0.8) = ([1+(Y´)^2]^3/2)/Y´´
and Y would be the formula for the shell, P(x) is the water pressure in the tube at depth x, which is a known value, and T is the tensile force which I need to find, because that's needed to spec the thickness of the plastic that the tube is to be made out of.
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>>8747011
Well, I can tell you that there is no formula for your shape. It is not a simple shape. You have to define it with various functions.
You will have to find a way to work around this.
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>>8747011
Do a parametric curve. You can create almost any shape parametrically
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You may be able to find one in polar coordinates.
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OP here
thanks for the feedback
It saddens me that no simple solution is possible - there are just too damn many variables in this
This was for development of an XBOX-HUEG tube for making temporary coffer dams - for flood protection, or if you need to cut a river in half or something
Oh well, I'll have to find another solution
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>>8747075
Try a polynomial regression on polar coordinates.
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>>8747075
Why not just use some of the water? Like divert it to Six Flags or let people drink it or water a farm or something?
Damn, engineers sure are dumb.
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>>8746989
How women can even compete jesus christ
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>>8747011
Make the shape in paint, then anyaliticly measure the distance to the rim of the shape. Use regression to find the polar equation.
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