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On Fri, 10 Jan 2003 20:06:59 -0600, Reusser <reu### [at] chorus net>
wrote:
> For a while, I thought the bridge would slowly stabalize and just sit there??like a
>bridge??but it's so much more interesting this way. :)
It falls over nicely
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Galloping Gertie, I believe Greg was referring to. A suspension bridge in
Tacoma, Washington, USA during the 1940's which waved in the wind until it
broke apart.
http://www.nwrain.net/~newtsuit/recoveries/narrows/gg.htm
I'd have thought it was spelled girdie too, since it is about steel girders.
Apparently the name was borrowed from a poem.
--
Farewell,
Bob
"Reusser" <reu### [at] chorusnet> wrote in message
news:100120032134054096%reu### [at] chorusnet...
> In article <3e1f8f8f$1@news.povray.org>, Greg M. Johnson wrote:
>
> > Girdie!
>
> Girdie? I'm not familiar with that one...
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Reusser wrote:
> Very sorry in advance for the sorenson 3 format, but I haven't got
> the mpg thing on a Mac down to a science yet...
> Here's an animation using MechSim in MegaPov 1.0. I've been
> having a great time fiddling around with it. The topology alone uses
> up a couple hundred lines of text, but I like the result. For a
> while, I thought the bridge would slowly stabalize and just sit
> there??like a bridge??but it's so much more interesting this way. :)
> I guess I forgot to take into account the lateral stiffness and
> structure. (I think it's because of rounding errors since it should
> be perfectly symmetrical over the z-axis.) Oh well, as long as no
> one was on the bridge at the time.
excellent stuff - lets just hope thats not fixed in a furture mechsim, can
you imagine the hassle of trying to model a bridge that did that
--
--
Rick
Kitty5 NewMedia http://Kitty5.co.uk
POV-Ray News & Resources http://Povray.co.uk
TEL : +44 (01270) 501101 - FAX : +44 (01270) 251105 - ICQ : 15776037
PGP Public Key
http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x231E1CEA
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In article <3e2010ce@news.povray.org>, hughes, b.
<omn### [at] charternet> wrote:
> Galloping Gertie, I believe Greg was referring to. A suspension bridge in
> Tacoma, Washington, USA during the 1940's which waved in the wind until it
> broke apart.
Okay, that makes sense. Chalk one up for resonance. Wait, no. I
didn't model a car, man, and *sniff* dog to be on it when it fell. But
I did think of the Tacoma Narrows and wondered how I could have wind
blow across it (like a cloth with a face, wind vector, dot product),
but that would be pretty tricky without altering the source. I was
also trying to think of a way to set a tolerance for each
connection--exceed the tolerance for stress and it disappears. It
would make a lot more sense for it to break as it falls rather than
bend and distort to no end. Just thoughts.
-Ricky
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From: Christoph Hormann
Subject: Re: Suspension Bridge (Sorenson 3)
Date: 11 Jan 2003 11:31:17
Message: <3E2046D5.2D96627A@gmx.de>
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Reusser wrote:
>
> Very sorry in advance for the sorenson 3 format, but I haven't got
> the mpg thing on a Mac down to a science yet...
Can't view it, sorry.
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 31 Dec. 2002 _____./\/^>_*_<^\/\.______
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In article <3E2046D5.2D96627A@gmx.de>, Christoph Hormann
<chr### [at] gmxde> wrote:
> Can't view it, sorry.
First of all, THANKS for MechSim. I just love it! Second, I'm sorry
for the format. It's just Apple's Quicktime (v. 5+ I think), but I
know Windows (or just non-mac) people don't particularly like
Quicktime. Can you view regular Sorenson? (not Sorenson 3) I could
repost if that would work. Like I said, I've had bad luck with mpg.
Sorry.
-Ricky
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Christoph Hormann wrote:
> Can't view it, sorry.
Aha! Searched through old povray.macintosh messages and found the link for
the exporter I had a long time ago. After fiddling with the settings for a
while, I got an acceptable result. Still, it is pretty low-quality since
it's re-compressed. I stand corrected.
I'll also take this opportunity to let any other mac users out there
know that (if you don't already have it) there is a divx codec for OS 9 and
10 at
http://www.3ivx.com/download/macos.html
-Ricky
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I never catch on. Here you go.
-Ricky
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Attachments:
Download 'almostlq3.mpg' (157 KB)
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From: Christoph Hormann
Subject: Re: Suspension Bridge (Sorenson 3)
Date: 11 Jan 2003 13:47:01
Message: <3E2066A4.F34AE00F@gmx.de>
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Reusser wrote:
>
> I never catch on. Here you go.
>
Looks good. Attaching the pillars and the ends of the bridge at the
ground will probably be a good idea. A real world bridge will surely also
fall when it is no more attached to the ground. :-)
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 31 Dec. 2002 _____./\/^>_*_<^\/\.______
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This seems to be lacking any fundations. Big blocks of concrete in the
ground might help.
Philippe
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