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Message 1 of 21 (1,226 Views)

calculating the three-dimensional surface area by autocad 2013

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11-11-2012 09:04 PM

How to calculate the three-dimensional surface area of a revolved arch (such as attached file)  by autocad 2007? such as an irregular dome.

Which software can do the job? Autocad or Matlab software or .....
for example , a three-dimensional surface is defined by 3 parameter such as x^3+2y^2-5z^3=0

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Message 2 of 21 (1,186 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-13-2012 03:23 PM in reply to: toiserkany

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Message 3 of 21 (1,173 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-13-2012 11:05 PM in reply to: toiserkany

If your math surface is defined by [X,Y,Z] = f(U,V) or if its definition can be converted to this form, you can use the free 3DPLOT utility - see: http://www.cadstudio.cz/en/apps/3dplot/

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Message 4 of 21 (1,167 Views)

Re: calculating the three-dimensional surface area by autocad 2013

thanks alot : My purpose is not drawing a 3D surface . My  main purpose is , calculating the outer area of a dome surface ,(such as a shell )  which is made  when an arc revolved around an axis in 3D space.

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Message 5 of 21 (1,145 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-14-2012 11:59 AM in reply to: toiserkany

Is the arch curve a hemisphere or a parabolic surface?

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Message 6 of 21 (1,133 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-14-2012 09:07 PM in reply to: gearknox

hello and thanks for your note: it can be assume parabolic surface or another similar  thing , but if it was a hemisphere  , area calculating  was simple! i draw the curve quite arbitrary, without any specific equation.

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Message 7 of 21 (1,124 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-15-2012 04:02 AM in reply to: toiserkany

Well if it is a true paraboloid then the solution can be found in several places on the web.

If it is not then I suggest that you slice the solid into a large number of pieces and treat each one as a cylinder.  That would, of course, be an approximation whose accuracy would be dependent on the number of slices.

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Message 8 of 21 (1,104 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-16-2012 06:19 AM in reply to: toiserkany

Perhpas my approach isn't as accurate as you might like but...

I modeled the dome and used solidedit to shell the solid, removing the bottom face and entering a really thin wall thickness. I used massprop to get the volume and divided that value by 2

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Message 9 of 21 (1,088 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-16-2012 04:32 PM in reply to: toiserkany

SUPER - a great solution.  Well Done!

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Message 10 of 21 (1,074 Views)

Re: calculating the three-dimensional surface area by autocad 2013

11-17-2012 02:30 AM in reply to: xboxphili

hello and thanks very much for your notice: Excuse me , but is it possible , explain more and exact?  I do not know your idea about , (shell the solid, and removing the bottom facuse mece). what do i do  exactly ?

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