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#1
10-19-2004, 12:09 PM
 thecaesar Junior Member Join Date: Oct 2004 Rep: 10 Posts: 8 Location: pal
ship volume

hi all
how are u
i want to know i can compute the volume of ship by triple integrations
if i have three equations ( e.g y = ax2 + bx + c ,
z = dy2 + ey + f ,
x = gz2 + hz + i)
i mean how can i do tripple integrations to this eqs
bye
#2
10-20-2004, 02:20 PM
 thecaesar Junior Member Join Date: Oct 2004 Rep: 10 Posts: 8 Location: pal
r u there ?
plz help
#3
10-20-2004, 02:29 PM
 sorenfdk Yacht Designer Join Date: Feb 2002 Rep: 394 Posts: 510 Location: Denmark
Yes - we're all here. But most of us are sailors, boatbuilders, yacht designers and naval architects, and we don't do that many triple integrations! Whenever we have to calculate volumes by hand, we tend to use Simpson integration or anything similar. Mainly because the shape of our designs cannot be described using polynomials like yours.
Maybe you should ask a mathematician instead?
__________________
Best regards,

Søren Flening

NOTE: This post is a natural product. The slight variations in spelling and grammar enhance its individual character and beauty and are in no way to be considered flaws or defects.
#4
10-22-2004, 09:58 PM
 Karsten Senior Member Join Date: Jun 2004 Rep: 22 Posts: 147 Location: Sydney
I'm not quite sure but I think it works like this:
First you need a funktion that describes the volume of whatever it is. If you have single functions in x, y, z then you have to multiply them.

V = x * y * z In your case:
V = (gz2 + hz + i)*(ax2 + bx + c)*(dy2 + ey + f)

To calculate the volume you have to do the tripple integration. I think you will also have a problem defining the boundaries of your integration. It's not going to be from -1 to +1. I think you will end up with a funktion for the boundaries for at least one coordinate direction. I the side direction you only want to integrate to the point where the waterline meets the hull. The coordinates of that point depend on the forward - aft coordinate.

Good luck,
Karsten
#5
10-23-2004, 03:25 PM
 thecaesar Junior Member Join Date: Oct 2004 Rep: 10 Posts: 8 Location: pal
thx very much
i know what do u said
but i want from u to do this
bye
#6
10-24-2004, 02:23 PM
 plain_sailing Junior Member Join Date: Oct 2004 Rep: 10 Posts: 10 Location: piraeus
hail

Your Highness Caesar it is impossible for someone to calculate the triple integral if u don't tell him which are the boundaries (boundary of x= length, boundary of y= depth, boundary of z=beam).U also have to define the values of the coefficients a,b,c,d, etc.Why don't u try to find the offsets of 10 tranverse sections of same distance each one, then the area of each transverse section and then integrate using Simpson rule or trapezoidal rule ??
#7
10-24-2004, 04:04 PM
 thecaesar Junior Member Join Date: Oct 2004 Rep: 10 Posts: 8 Location: pal
hi
u can assume any values for boundaries & coefficient
thx

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