4. B modeling#
4.1. Characteristics of modeling#
This cyclic repeatable structure is studied using the MAC - NEAL cyclic dynamic substructuring method.
A base sector, constituted by an angular sector of \(\text{20°}\), is meshed into triangles to which plate elements DKT are assigned.
The modal base used for the sector is composed of 20 specific modes and attachment modes associated with interfaces.
4.2. Characteristics of the mesh#
Number of knots: 66.
Number of meshes and types: 100 triangles with 3 knots DKT
4.3. Tested sizes and results#
Number of |
Number of |
|||||
Number order |
diameter nodes \(i\) |
circles nodes \(j\) |
Reference |
Aster |
% difference |
|
1 |
0 |
0 |
0 |
79.26 |
79.58 |
0.4 |
8 |
0 |
1 |
518.85 |
518.85 |
519.53 |
0.1 |
2.3 |
1 |
0 |
81.09 |
81.09 |
81.18 |
0.1 |
9.10 |
1 |
1 |
528.61 |
528.61 |
529.50 |
0.2 |
4.5 |
2 |
0 |
0 |
89.63 |
89.72 |
0.1 |
11.12 |
2 |
1 |
559.09 |
559.48 |
0.07 |
|
6.7 |
3 |
0 |
112.79 |
112.79 |
113.16 |
0.3 |
13.14 |
3 |
1 |
1 |
609.70 |
609.76 |
0.01 |
4.4. notes#
Modes with more than 1 modal diameter are dual modes.