Turbine bucket natural frequency tuning rib

摘要

A tuning rib (18) is added preferably in the aft cavity (16) of a cored turbine bucket (10) to alter the bucket's natural frequencies. The tuning rib may be a solid rib (18) 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.