4. Results#
4.1. Calculation A: natural frequencies, rotor stopped (\(\Omega =0\))#
Reference frequency (\(\mathrm{Hz}\)) |
Aster frequency (\(\mathrm{Hz}\)) |
% difference |
60.618 |
60.60643 |
1.91E-02 |
63.029 |
63.01608 |
2.05E-02 |
169.513 |
169.4401 |
4.3E-02 |
185.584 |
185.4870 |
5.23E-02 |
329.613 |
329.4818 |
3.98E-02 |
362.089 |
361.9114 |
4.91E-02 |
529.291 |
529.8633 |
8.08E-02 |
557.549 |
557.0589 |
8.79E-02 |
831.111 |
830.4900 |
7.47E-02 |
846.013 |
845.3138 |
8.26E-02 |
Table 4.1-1: Calculation of frequencies specific to stopping
4.2. Calculation B: natural frequencies, rotating rotor (\(\Omega =25000\mathrm{tr}/\mathrm{min}\))#
Reference frequency (\(\mathrm{Hz}\)) |
Aster frequency (\(\mathrm{Hz}\)) |
% difference |
55.408 |
55.4052 |
5.09E-03 |
67.209 |
67.1844 |
3.66E-02 |
157.904 |
157.8519 |
3.3E-02 |
193.706 |
193.5477 |
8.17E-02 |
249.898 |
249.7995 |
3.94E-02 |
407.619 |
407.1379 |
11.8E-02 |
446.622 |
446.2338 |
8.69E-02 |
622.654 |
622.0188 |
10.2E-02 |
715.03 |
713.9362 |
15.2E-02 |
Table 4.2-1: Calculation of frequencies specific to stopping (QZ algorithm)
Reference frequency (\(\mathrm{Hz}\)) |
Aster frequency (\(\mathrm{Hz}\)) |
% difference |
55.408 |
55.4052 |
5.08E-03 |
67.209 |
67.1844 |
3.66E-02 |
157.904 |
157.8519 |
3.3E-02 |
193.706 |
193.5476 |
8.17E-02 |
249.898 |
249.7995 |
3.94E-02 |
407.619 |
407.1379 |
11.8E-02 |
446.622 |
446.2337 |
8.69E-02 |
622.654 |
622.0188 |
10.2E-02 |
715.03 |
713.9362 |
15.2E-02 |
Table 4.2-2: Calculation of frequencies specific to \(25000\mathrm{tr}/\mathrm{min}\) (Sorensen algorithm)
Reference frequency (\(\mathrm{Hz}\)) |
Aster frequency (\(\mathrm{Hz}\)) |
% difference |
55.408 |
55.4075 |
8.39E-04 |
67.209 |
67.1872 |
3.25E-02 |
157.904 |
157.8626 |
2.62E-02 |
193.706 |
193.5564 |
7.73E-02 |
249.898 |
249.8516 |
1.86E-02 |
407.619 |
407.3783 |
5.9E-02 |
446.62 |
446.5080 |
2.55E-02 |
622.65 |
622.5052 |
2.39E-02 |
715.03 |
714.2990 |
10.2E-02 |
Table 4.2-3: Calculation of frequencies specific to \(25000\mathrm{tr}/\mathrm{min}\) (resolution in two stages)