Re: [PSUBS-MAILIST] Software

[MerlinSub@t-online.de]

Smile.. obviously were were on the same school.. :-) vbr Carsten

"Sean T. Stevenson" <cast55@telus.net> schrieb:
> On 21/10/2010 7:17 PM, kocpnt tds.net wrote:
> > Hi Firebolt,
> > I'm certainly old school, however I believe that you first have to 
> > determine mission and performance guidelines and THEN after 
> > determining the rough size and shape begin determining technical features.
> > Just my two cents!
> > Best Regards,
> > Jim K
> >
> 
> Agreed.  There is no substitute for putting pencil to paper.
> 
> That said, spreadsheets are an easy way to do weight / buoyancy calcs, 
> electrical calcs, etc.  I also use various CAD and FEA packages for the 
> mechanical design details, CES software for materials analysis (  found 
> here: http://www.grantadesign.com/products/ces/  ), and a software 
> package I wrote myself for pressure hull design in accordance with ABS 
> regs.  Of course, the beauty of software is that it really allows you to 
> make bigger mistakes faster, so you must have some background knowledge 
> before using the computer to automate the process.  Design is an 
> iterative process, starting with your functional requirements:
> 
> passenger capacity: (pilot(s), scientists or technical personnel, 
> tourists or laypersons, etc.)
> operating theatre: (lake vs. ocean, inshore or offshore, sea state 
> capability, etc.)
> operating depth: (typical, maximum)
> propulsion: (electric thusters, diesel electric, AIP, etc.)
> operating range: (will dictate battery bank / fuel / life support capacity)
> mission objectives / vehicle role (observation only, videography, 
> collection, working, etc.)
> launch / recovery methods (i.e. trailerable, ship launched, 
> self-sufficient, etc.)
> maximum cost (if on a budget, this may be the dominant constraint)
> 
> Answer all of the above, and you will have enough information to begin a 
> preliminary design.  As you work through the process, formulate specific 
> questions which you can then use software tools to help answer.  Just 
> bear in mind that with any software, garbage in = garbage out.  Software 
> will not design a sub for you, in much the same way as a hammer will not 
> build a house for you.  Know what question you are trying to answer 
> before answering it, and then check that the answer makes sense.
> 
> -Sean
> 
> 
> 
> 
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