7. Summary of results

• A and B models:

Precision on natural frequencies \(\text{≤ 1\%}\) up to the sixth mode of bending.

• C modeling:

In substructuring, the quality of results could be improved by using a finer substructure mesh.

• D modeling:

To obtain a precision of \(\text{1\%}\) on the natural frequencies, it is also necessary to condense on the 4 middle nodes of the edges \(L\), \(M\), \(N\) and \(O\).