[PSUBS-MAILIST] 1-ATM design

[Sean T. Stevenson via Personal_Submersibles]

There is nothing specific to imperial / US standard units about the equations given in the ABS rules. They work with any self-consistent set of units, and in fact my own software tracks dimensionality using MKS / SI units exclusively.

Sean


On August 20, 2016 6:05:50 AM MDT, Petar Topljak via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Hi Alec,
>
>As I understanded that, the D cell is there for another section of
>different diametre, my design has only one D0 - 1800 mm .
>I also have issues with ABS rules as they are made according to
>imperial
>system, It would be desirable to have the calculations in my assignment
>in
>metric system.
>
>Thank You for quick response; Petar
>
>2016-08-20 13:56 GMT+02:00 Alec Smyth via Personal_Submersibles <
>personal_submersibles at psubs.org>:
>
>> Hi Peter,
>>
>> Welcome, and I wish I'd had that assignment in college! The blue
>cells are
>> calculated, but for that to happen you need to populate the white
>ones. For
>> example on your first screen shot, the material properties in column
>D have
>> not been entered.
>>
>>
>> Best,
>>
>> Alec
>>
>> On Sat, Aug 20, 2016 at 6:16 AM, Petar Topljak via
>Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> 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
>>>
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
>>
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>>
>
>
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