[PSUBS-MAILIST] 1-ATM design

[Petar Topljak via Personal_Submersibles]

Another question is regarding the parametre Ls, or centre to centre spacing
of stiffeners, since due to design - portrusion for tower is 850 mm wide
but i cannot place stiffeners exactly at the edge of portrusion, so I
offseted them 100 mm from opening (this is also questionable). So now I
have 2 different spacings between stiffeners, and I wonder which one to
use, my guess would be the bigger one.

Thank you in advance, Petar

2016-08-20 12:16 GMT+02:00 Petar Topljak <petar.topljak at gmail.com>:

> Hi everyone,
>
> My name is Petar and I am coming from Rijeka, Croatia.  I am designing
> 1-ATM one man submersible as a project for one of my subjects at my
> university.
>
> The idea is to design a pressure hull that can safely whitstand pressure
> at 150 meters. Procedure is to design submersible according to ABS (or ASME
> or any else classification company) rules, create model using 3d modelling
> software and do a finite element analysis of the model.
>
> The problems I ran into are in using the spreadsheet, as there are some
> parameters that are not defined in the ABS rules, or I am not able to find
> them or understand them due to my english skills, + we use metric system,
> so changing creates additional problems.
>
>
> I understand the classic questions asked about the lobes and coefficients
> (eta), but i had issues with Tw, Lw Lf and tf parametres - "mail3
> stiffener.png" am I doing it right ?
>
> I am also sending you screenshots of my sheet, so you can check it if you
> like and alert me for any possible mistakes.
>
> Thank You in advance, Petar
>
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