Math/Engineering help needed....

Dec 04, 2003 4 Replies
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I'm working on a project for school, and I'm having a hard time trying to figure it out. What is required is to write a program, of our choice, to find the section properties of an arbitrary shaped region from coordinates of its vertices.



Section Properties include:



  1. Area
  2. Centroid location
  3. Moments of Inertia


The Area and Centroid Locations are straight forward, but I've been having problems determining the Moments of Inertia. If anyone can help me out it would be greatly appreciated. Remember, all I know is the coordinates of the vertices, and it's an arbitrary cross-section.



email me at snipped-for-privacy@hotmail.com



Thanks,



-Matt


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P

Here's a program written in QBasic from sci.engr.civil that might do what you want:

formatting link

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D

a program to calculate these results has been around in LISP for years. Do a Google search for SectionProps.lsp or SectionProperties.lsp or some such. Dave

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K

I agree not supplying the code. Matt only asked for help in the principle needed.

Hint: What if your code created triangle sections between all points. For example with 5 vertices you make three triangle. Calculate moment of inertia for each and add them together based on mathethimatical theories.

I believe that's the type of inquiry Matt first made. He may be trying to learn something here.

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