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Experiment at understanding Pivot energy
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BillM
Full Member
Posts: 120
Experiment at understanding Pivot energy
«
on:
January 15, 2020, 05:17:10 PM »
Art
I created the attached PivotEner
gy.vcp & PivotEner
gy2.vps files to investiga
te
the pivot energy setting. Each file has Body Energy Coefficie
nt (BOE)=.99 and
varies PivotEner
gy from ~0 (.0001) to 1.0 in steps of .1
In each case I do select all the shapes in the main layer so I can see
the movement of the center of gravity during the simulatio
n
PivotEner
gy.vcp Uses circles with off center center of gravity.M
ost of the
circles except the .9 and 1.0 circles rapidly stop oscillati
ng.
PivotEner
gy2.vcp repeats the above using crosses. The effect is the same
except for the .0001 (~0) case. The ~0 case seems to behave like the
1.0 case. This only happened when the value was less than .1. I didn't
expect the shape of the object to have any effect.
I have no idea why the .0001 case in PivotEner
gy2.vcp behaved like it did.
Based on the experimen
ts, it seems that as you lower the value of pivot energy
from the default .9999 the ability to maintain rotation about a pivot decreases
.
Is this a form of friction or something to do with moment of rotationa
l momentum?
Bill Michael
PivotEnergy.vcp
(1226.52 KB - downloaded 53 times.)
PivotEnergy2.vcp
(1193.65 KB - downloaded 45 times.)
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ArtF
Administrator
Hero Member
Posts: 5681
Re: Experiment at understanding Pivot energy
«
Reply #1 on:
January 18, 2020, 10:46:54 AM »
Hi Bill:
Pivot Energy internall
y is called PivotFric
tion. Its applied to the rotationl body to simulate friction, it
is not linear but exponenti
al so will have a great damping effect.
Art
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