Hp41 structural analysis pac porting to hp49g+ Message #1 Posted by Giancarlo on 12 May 2012, 2:54 p.m.
Hello,
I bought some weeks ago the hp41 structural analysis pac and i am very happy about it.
I was porting the equations used in the manual to my hp49g+ but i am having an issue with a formula. I am asking to other mechanical engineers or mathematicians if they did it with success.
The formula i am referring to has been extracted from Felix Wojiechowski book, properties of plane cross sections, machine design, p. 150, jan 22, 1976.
Given the coordinates of a section i would like to calculate the product of inertia Ixy.
The formula starts like this:
Sum for i=0 to N where N is the number of coordinates for
1
 * [ 1/8*(........)]
(xi+1  xi)
It is obvious that if xi+1 and x1 are the same (vertical points) the division leads to infinite.
The hp41 with the ROM does not stop because of this issue...
Any help is apreciated,
Thanks
Giancarlo
