Method For Testing Rotors

• US 20100089136A1
• Filed: 06/25/2007
• Published: 04/15/2010
• Est. Priority Date: 07/25/2006
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Lüneburg, Bernd
• Granted Patent: US 8,261,616 B2
• Time in Patent Office: Days
• US Class Current: 73/112.10
• CPC Class Codes: G01H 1/006 of the rotor of turbo machines

Abstract

A method for testing rotors is disclosed, wherein a rotor to be tested is coupled in a torque-transmitting manner to an activating motor and is set in rotation. Vibrations of the rotor to be tested are measured, wherein the activating motor is operated such that torsional excitations are generated in the rotor.

Claims

1-14. -14. (canceled)

15. A method for testing rotors, comprising:

coupling a rotor to be tested in a torque-transmitting manner to an activating motor;

setting the rotor in rotation by the activating motor;

operating the activating motor such that torsional excitations are generated in the rotor; and

measuring vibrations of the rotor.

16. The method as claimed in claim 15, wherein the torsional excitations are generated such that the torque transmitted from the activating motor to the rotor also has a component which is variable with respect to time as well as a component which is constant with respect to time.

17. The method as claimed in claim 16, wherein the component of the transmitted torque which is constant with respect to time is achieved with a drive motor and the component which is variable with respect to time is achieved with the activating motor.

18. The method as claimed in claim 16, wherein the component which is variable with respect to time is a harmonic function.

19. The method as claimed in claim 17, wherein the component which is variable with respect to time is a harmonic function.

20. The method as claimed in claim 16, wherein the component which is variable with respect to time exhibits an amplitude.

21. The method as claimed in claim 17, wherein the component which is variable with respect to time exhibits an amplitude.

22. The method as claimed in claim 16, wherein the activating motor transmits the torque to the rotor according to the following equation:

M(t)=M0+MA×

sin(ω

(t)×

t), wherein

M0=Torque which is constant with respect to time,

MA=Amplitude of the component which is variable with respect to time,

ω

(t)=Frequency which is variable with respect to time.

23. The method as claimed in claim 22, wherein the frequency ω

(t) is varied from a starting value to a target value at a fixed rotational speed of the rotor and the amplitude MA remains constant.

24. The method as claimed in claim 23, wherein the amplitude MA is varied and the frequency ω

(t) is again varied from a starting value to a target value.

25. The method as claimed in claim 15, wherein blades are arranged on the rotor and vibrations of the blades are measured.

26. An activating motor for use in a measuring arrangement to measure vibrations of a rotatably mounted rotor, wherein torque transmitted from the activating motor to the rotor has a component which is constant with respect to time and a component which is variable with respect to time.

27. The activating motor as claimed in claim 26, wherein the component which is variable with respect to time is a harmonic function.

28. The activating motor as claimed in claim 26, wherein the torque is transmitted according to the following equation:

M(t)=M0+MA×

sin(ω

(t)×

t), wherein

M0=Torque which is constant with respect to time,

MA=Amplitude of the component which is variable with respect to time,

ω

(t)=Frequency which is variable with respect to time.

29. The activating motor as claimed in claim 28, wherein the frequency ω

(t) varies from a starting value to a target value at a fixed rotational speed of the rotor.

30. The activating motor as claimed in claim 28, wherein the amplitude MA varies.