Active Member
Posts: 10
Registered: ‎11-11-2012
Message 1 of 21 (1,493 Views)

# calculating the three-dimensional surface area by autocad 2013

1493 Views, 20 Replies
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

---------------------------------------------------------------------------------------------------
Life is beautiful
The feeling is always stunned!
*Expert Elite*
Posts: 26,186
Registered: ‎04-20-2006
Message 2 of 21 (1,453 Views)

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

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

-----------------------------------------------------------------------------------------
Autodesk Inventor 2014 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2015 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
*Expert Elite*
Posts: 233
Registered: ‎09-17-2006
Message 3 of 21 (1,440 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/

Active Member
Posts: 10
Registered: ‎11-11-2012
Message 4 of 21 (1,434 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.

---------------------------------------------------------------------------------------------------
Life is beautiful
The feeling is always stunned!
Valued Contributor
Posts: 53
Registered: ‎08-24-2004
Message 5 of 21 (1,412 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?

Active Member
Posts: 10
Registered: ‎11-11-2012
Message 6 of 21 (1,400 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.

---------------------------------------------------------------------------------------------------
Life is beautiful
The feeling is always stunned!
Valued Contributor
Posts: 53
Registered: ‎08-24-2004
Message 7 of 21 (1,391 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.

Active Member
Posts: 9
Registered: ‎12-21-2011
Message 8 of 21 (1,371 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

Valued Contributor
Posts: 53
Registered: ‎08-24-2004
Message 9 of 21 (1,355 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!

Active Member
Posts: 10
Registered: ‎11-11-2012
Message 10 of 21 (1,341 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 ?

---------------------------------------------------------------------------------------------------
Life is beautiful
The feeling is always stunned!

### You are not logged in.

Announcements
Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.

### Maintenance Subscription Resources

Upgrading to a 2015 product? Make sure to check these out 1st!