1. Dynamics DYSTIFF s.r.o., Olomouc

2. Vertical pump - Variable speed of rotation - High level of vibration - Two eigenfrequencies in speed range

3. Calculation model of the original design

4. Harmonic response

5. Eigenmode

7. Wrong solution

8. Recommended design

9. Harmonic response of modified design

10. Eigenmode

12. Elastic rotor of long vertical pump - Water lubricated rubber bearings - Long segmented rotor - Modal analysis - Harmonic excitation - Start up state

13. Calculation model of elastic rotor

14. First eigenmode of rotor

15. Response spectra of harmonic excited rotor

16. Response of staring up rotor

17. High pressure water station - Plunger pumps with hydraulics dampers (resonators) - High level of vibrations - Failure of connecting flanges

18. Schema of station

19. Calculation model of one damper

20. Shape of vibration

21. Stress intensity in the resonator support

22. Submodel of flange connection to the pump

23. Stress intensity amplitude in the flange during one period