4. Model A results#
4.1. Tested values#
Changes in the natural frequency and the reduced damping of the fifth air mode of the structure, as a function of the average flow speed.
Speed flow ( \(m/s\) ) |
Frequency MOCCA ( \(\mathrm{Hz}\) ) |
Frequency Aster ( \(\mathrm{Hz}\) ) |
gap (%) |
Love reduced amor** |
Love MOCCA (%) |
Reduced Love Aster (%) |
difference (%) |
31.8794 |
32.5315 |
2.5315 |
2.046 |
0.0353905 |
0.0359752 |
1.652 |
|
31,8806 |
32.5327 |
2.5327 |
2.045 |
1.27602 |
1.24509 |
—2,114 |
|
31.8842 |
32.5361 |
2.0361 |
2.045 |
2.50164 |
2.43947 |
—2.485 |
|
31.8900 |
32.5419 |
2.5419 |
2.044 |
3.74046 |
3.64669 |
—2.507 |
|
31.8982 |
32.5500 |
2.5500 |
2.043 |
4.97402 |
4.84884 |
—2.517 |
|
31.9087 |
32.5603 |
2.5603 |
2.042 |
6.20616 |
6.04989 |
—2.518 |
|
31.9217 |
32.5731 |
2.5731 |
2.041 |
7.43705 |
7.24936 |
—2.524 |
|
31.9372 |
32.5880 |
32.5880 |
2.038 |
8.66394 |
8.44513 |
—2.526 |
|
31.9546 |
32.6054 |
32.6054 |
2.037 |
9.89269 |
9.64298 |
—2.524 |
4.2. notes#
The results are in line with what could be expected.
A difference of the order of 2% in frequency and reduced damping appears, due to differences between models and resolution methods. This difference is reasonable considering the initial frequency of the non-flow structure (\(\mathrm{90,4}\mathrm{Hz}\)).