Claims
- 1. A method of tuning a turbine bucket having an internal cavity, the method comprising:
(a) designing the turbine bucket construction; (b) testing the turbine bucket; and (c) after steps (a) and (b), adding a rib in the internal cavity to thereby alter a natural frequency of the turbine bucket.
- 2. A method according to claim 1, wherein step (c) is practiced by adding a rib in an aft cavity of the turbine bucket.
- 3. A method according to claim 1, wherein step (c) is practiced by adding a solid rib.
- 4. A method according to claim 1, wherein step (c) is practiced by adding a segmented rib.
- 5. A method according to claim 1, wherein step (c) is practiced by adding the rib to thereby alter high order frequency modes.
- 6. A method according to claim 5, wherein the high order frequency modes include at least one of 2T, 4F and 1-3S.
- 7. A turbine bucket that is tuned according to the method of claim 1.
- 8. A turbine bucket comprising an internal cavity and a tuning rib added in the cavity that alters a natural frequency of the turbine bucket.
- 9. A turbine bucket according to claim 8, wherein the tuning rib is disposed in an aft cavity of the turbine bucket.
- 10. A turbine bucket according to claim 8, wherein the tuning rib is solid.
- 11. A turbine bucket according to claim 8, wherein the tuning rib is segmented.
Government Interests
[0001] This invention was made with Government support under Contract No. DE-FC21-95MC-31176 awarded by the Department of Energy. The Government has certain rights in this invention.