[PSUBS-MAILIST] 1-ATM design

[Petar Topljak via Personal_Submersibles]

Looks like I will have to do what Jim suggested and ad a sepparate column
with conversion formula, I tried to simply imput mm or m for lenght/width
etc but shell parameters come out negative ( either G or N ). I will have
to figure out how to take care of thate later since I have to include all
the calculations in paper.

Petar

2016-08-20 14:51 GMT+02:00 Jim via Personal_Submersibles <
personal_submersibles at psubs.org>:

> Hello Peter,
> Welcome to the group.  Could you add a column containing the appropriate
> conversion formulae to render the values in metric?
> Jim
>
> Sent from my iPad
>
> On Aug 20, 2016, at 7:32 AM, Sean T. Stevenson via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 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
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
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