3. Modeling A#
3.1. Characteristics of modeling#
Discrete element in type translation **** DIS_T **
Items used: POU_D_T. Beam characteristics are defined by:
POUTRE: (GROUP_MA: GRMAPRIM… SECTION: “RECTANGLE” CARA: (“HZ” “HY”) VALE: (0.1 0.1) …);
The calculation method requires the calculation of static modes corresponding to the degrees of freedom of excitation.
The natural frequencies taken into account in the calculations are all frequencies in band \([\mathrm{0, 35}\mathrm{Hz}]\).
3.2. Characteristics of the mesh#
Number of nodes: |
\(\mathrm{PA}\): 31 |
|
|
Number of meshes and types: |
\(\mathrm{PA}\): 30 SEG2 |
: 30 |
|
3.3. Tested sizes and results#
Standard deviation, average maximum, and peak factor calculated by POST_DYNA_ALEA for the Kanai Tajimi spectrum:
Size tested |
Reference |
% Tolerance |
Type |
Standard deviation |
5.522084286 |
|
Non Regression |
Median maximum |
18.643183662069 |
|
Non Regression |
Peak Factor |
3.3761135643155 |
|
Non Regression |
Fractile maximum 95% |
22.5384604631 |
|
Non Regression |
Comparison of the standard deviation calculated by POST_DYNA_ALEA for DSP by Kanai Tajimi and with the standard deviation of a signal realization with GENE_FONC_ALEA:
Size tested |
Reference |
% Tolerance |
Type |
Standard deviation |
5.522084286 |
|
Other Aster (POST_DYNA_ALEA) |
Values of the acceleration response spectral density at the point \(\mathrm{PB25}\) by direct calculation:
Frequency |
Node |
Reference |
% Tolerance |
Type |
|
\(5.\mathrm{Hz}\) |
|
3.6913 |
0.01 |
Non Regression |
|
\(10.\mathrm{Hz}\) |
|
75.439 |
0.01 |
Non Regression |
|
\(15.\mathrm{Hz}\) |
|
1.6777 |
0.01 |
No Regression |
|
\(20.\mathrm{Hz}\) |
|
1.1367 |
1.1367 |
0.01 |
Non Regression |
\(25.\mathrm{Hz}\) |
|
0.2927 |
0.01 |
Non Regression |
Values of the acceleration response spectral density at the point \(\mathrm{PB25}\) by chained calculation:
Frequency |
Node |
Reference |
% Tolerance |
% difference |
|
\(5.\mathrm{Hz}\) |
|
3.6913 |
1.0 |
Other Aster |
|
\(10.\mathrm{Hz}\) |
|
75.439 |
75.439 |
1.0 |
Other Aster |
\(15.\mathrm{Hz}\) |
|
1.6777 |
1.0 |
Other Aster |
|
\(20.\mathrm{Hz}\) |
|
1.1367 |
1.1367 |
4.0 |
Other Aster |
\(25.\mathrm{Hz}\) |
|
0.2927 |
0.2927 |
11.0 |
Other Aster |