On Tue, 30 Sep 2003 06:13:26 -0700, Pierce Nichols
<[EMAIL PROTECTED]> wrote:
> Oh, I would, but for another reason. The 6DOF equations in
>Simulink are written with the assumption that mass properties are constant.
>That means I would have to, instead of modeling the torques, model the
>changing level of propellant... and its sloshing. I might just be able to
>get away with modeling it as a pendulum, but that will be pushing it.
Sloshing? Slosh will be a PITA to model, yes. And the purist will
want to include it. But...
Where will the slosh come from? Isn't all of the acceleration along
the vertical axis of the vehicle? Seems to me the only way you could
get slosh is a) if an engine quit, b) if you get hit by a strong gust
of wind (POGO will have a pretty high cross sectional density, so will
not be greatly affected by wind), or c) if you're flying horizontally
at speed and you suddenly pitch back to level. If a) happens, you
won't care about slosh. To prevent b), don't fly in strong gusts. To
prevent c), don't do that.
Yes?
-R
--
"SEAL training is just like Ranger training, except
it's three weeks longer. It takes that long to teach
them how to balance the balls on their noses."
-- Doug Jones
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