[PSUBS-MAILIST] Confusing formula in Spreadsheet vs ABS rules

[André Eriksen]

You are absolutely right Antoine!

Thanks.


Regards
André


2013/9/27 Antoine Delafargue <pilotfishp at gmail.com>

> Hi André,
>
> The spreadsheet is ok,
> using a multiplicator sign would be ok but with some extra brackets around
> the whole denominator
>
> a/(b*c) = a/b /c
>
>
> regards
> Antoine
>
>
>
> On Fri, Sep 27, 2013 at 5:50 AM, Jon Wallace <jonw at psubs.org> wrote:
>
>>
>> I think you are correct.  Cliff or Sean, can you confirm?
>>
>> Jon
>>
>>
>>
>>
>> On 9/26/2013 9:31 PM, André Eriksen wrote:
>>
>> Hi !
>>
>>  I have been studying the psub spreadsheat and found a inconsistent
>> formula compared to the ABS Rules for Building and Classing Underwater
>> Vehicles.
>> It`s in cell *C48: Pm= Von Mises Shell Buckling Pressure for a Cylinder.*
>>
>>   C48 =2,42*C6*(C26/C17)^2,5/(1-C7^2)^0,75/(C14/C17-0,45*(C26/C17)^0,5)
>>
>>               ^
>> The division sign I have highlighted above in the spreadsheet formula
>> should.. (if you look at the ABS formula section 6 - 19.5.1 Inter-Stiffener
>> Strenght).. be a Multiplicator.
>>
>>  But changing this gives me a low Maximum psig for inter-stiffeners.
>>
>>
>>  I`m confused! Could someone please explain this? :-)
>>
>>
>>  *Best Regards*
>> André Eriksen
>>
>>
>> _______________________________________________
>> Personal_Submersibles mailing listPersonal_Submersibles at psubs.orghttp://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>>
>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>


-- 
Med Vennlig Hilsen / Regards
*André Eriksen*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20130928/88bbae8a/attachment.html>