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)