Eigenfrequency analysis problem

Hi,

I'm dealing with a nano rod vibration.
I want to know the displacement of some point on the eigen mode. (0.5 L, 0.125 L, .....)
However, I found that I can't find the same value that is I will get different answer after evaluation (on all the same condition).

ex.
sol.1 : 700Hz 20um
sol.2 : 700Hz 30um

The following is the processes I did,

Study: eigenfrequency
desired number: 30

after compute

use cut point 3D set some point in the center of rod but at different L

use derived value, Point Evaluation , then change the Data set to cut point 3D

then find u, v, w

the result is that i can't find the totally consistent answer in two time~~

(I thing is not the mesh problem)



L=length of the rod.


Thank you very much.


HW