[python] Re: pivot again
- From: George Durbridge <gdurbrid@xxxxxxxxxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: 25 Apr 2006 20:25:26 +1000
On Tue, 2006-04-25 at 19:38, Jürgen Mages wrote:
> > Thanks Jürgen. It would be interesting to see how an increasing pivot
> > length changes the tensile and compressing forces. Perhaps you could run
> > a series of four calculations based on 2kN load at the pivot with CG
> > ratio 60/40 (member length as in your attachment) and then make the pivot
> > 10, 20, 30 and 40 cm long.
>
> Here we go:
>
> Pivot load is 200 kg. All forces are in kg.
> Pivot lenght is 40, 30, 20, 10 and 5 cm.
>
> I would estimate the dynamic load is 10 times the static load.
This confirms that the forces are approximately inversely proportional
to the length of the pivot, as you would expect on simple beam theory,
which is not too bad an approximation to this frame. In theory, you
could build a much lighter frame, using a long pivot: but where to fit
the long pivot?
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