Thank you very much for your help. I have read that but still I can't understand the meaning of harmonic index. In that text, I recognized the relationship between nodal diameter and harmonic index but why in full model (360┬░) there is no request for determination of harmonic index. I have three questions:
1. Is 'harminic index' equivalent to nodal circle? ( When nodes are positioned in a circular shape)
2. How many harmonic index should be considered?
3. What is the relationship between cyclic symmetric modeling and harmonic index?
Thanks for any help.