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

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)