I want to obtain the center of gravity COG of HAWT blade before testing it.
Dear Ahmed
If you want to go computerized then you should read an article entitled A Comparison Of The Least-Squares And Center Of Gravity Algorithms
http://proceedings.spiedigitallibrary.org/mobile/proceeding.aspx?articleid=1239826
Your university library would be able to download the article for you.
Regards Gerro
Dear Ahmed;
If you go with computer programs with structural analysis you can compute it, but if you are talking about the nonhomogeneous cross-section centroids of a composite blade than you can see it in an Aircraft Structural Analysis book, such as Bruce K. Donaldson's "Analysis of Aircraft Structures" McGraw-Hill, 1993 ed. page 247.
Dear Gerro and Tolun ,
Thanks for your comments. My problem is not the computerized calculations ...I got it analytically. I want to validate the analytic solution experimentally.
After researching on the experimental methods to get the COG and to make the question useful for those who search in this point:
Method 1:
The center of gravity of the blade can be found out by hanging the blade as free as possible in two or three different positions and marking each time the vertical line that starts from the pivot point and the intersection of the vertical lines gives the center of gravity as shown in figure.
Method 2:
Mounting the blade on two jigs, each one at each end. One of the jigs will be displaced along the blade therefore the distance between the two jigs changes. When the movable jig is positioned beyond the center of gravity of the blade, then the blade becomes unbalanced and starts to turn.
Hope this help all colleagues who answered me.
Thanks Gerro Prinsloo and S. Tolun
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