Re: [balloon-makers] Matlab over AutoCad stress?

[Paul Vincent Craven <private e-mail address>]

Bob Nungster's program also calculates lift and
approximate envelope weight. My envelope was off by
only a few pounds from the estimate.

I don't know what happened to him. I'd love to have
those equations available for use. He seems to have
disappeared off the web.

--- Tim Baggett <tim@oasis.com> wrote:
> As an electrical engineer, AutoCad has always caused
> me stress...
> 
> I used Matlab to model MacNutt's third balloon, and
> it worked well.
> Matlab is a numerical analysis package that operates
> well on vectors and
> matrices. It is programmed through a Matlab
> scripting language (they
> also have Simulink which is block oriented, but I 
> have not used it).
> 
> Since I use Matlab often in college and in my day
> job doing signal
> analysis and signal processing, I spent a little bit
> of time importing
> Phil's half-gore pattern from the Smalley
> spreadsheet into Matlab. From
> there, a Matlab script mathematically fit the gores
> together into a full
> 3D envelope shape. It could easily be modified to
> calculate volume, etc.
> I have the Matlab generated images and source on my
> web site, which
> currently appears to be down.
> 
> I had always wanted to take this a step farther and
> model the lifting of
> the envelope, with a load (basket, equipment, etc.).
> I'm not a
> professional mechanical or civil engineer, but I did
> take statics and
> dynamics, so I would think that with some studying
> and consulting, the
> script could then calculate an estimate of the
> stress loading. To really
> get fancy, one could probably allow for stretching
> of the fabric, etc.
> 
> 
> Does any known model of the temperature inside an
> envelope exist? Have
> any known experiments been done?
> 
> Or, is it best to assume the entire volume of the
> envelope is of a
> constant temperature, with no temperature variations
> throughout?
> 
> Tim
> 
> 
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