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

[Antoine Delafargue]

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
>
>
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