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

Jon Wallace jonw at psubs.org
Fri Sep 27 00:50:49 EDT 2013


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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