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Turbine bucket natural frequency tuning rib

United States Patent

6,481,972
November 19, 2002
View the Complete Patent at the US Patent & Trademark Office
A tuning rib is added preferably in the aft cavity of a cored turbine bucket to alter the bucket's natural frequencies. The tuning rib may be a solid rib or a segmented rib and is particularly suited for altering high order frequency modes such as 2T, 4F and 1-3S. As such, detrimental crossings of natural bucket frequencies and gas turbine stimuli can be avoided to thereby improve the reliability of a gas turbine without impacting other features of the bucket that are important to the performance of the gas turbine.
Wang; John Zhiqiang (Greenville, SC), Norton; Paul Francis (Greenville, SC), Barb; Kevin Joseph (Halfmoon, NY), Jacala; Ariel Caesar-Prepena (Simpsonville, SC)
General Electric Company (Schenectady, NY)
09/ 741,892
20020081206
December 22, 2000
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.