Turbine bucket natural frequency tuning rib

摘要: A tuning rib is added preferably in the aft cavity of a cored turbine bucket to alter bucket's natural frequencies. The may be solid or segmented and particularly suited for altering high order frequency modes such as 2T, 4F 1-3S. As such, detrimental crossings frequencies gas stimuli can avoided thereby improve reliability without impacting other features that are important performance turbine.