Turbine bucket natural frequency tuning rib
First Claim
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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 for high cycle fatigue problems based on a natural frequency of the turbine bucket; and
(c) after steps (a) and (b), altering the natural frequency of the turbine bucket by adding a rib in the internal cavity.
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Abstract
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.
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Citations
11 Claims
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1. A method of tuning a turbine bucket having an internal cavity, the method comprising:
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(a) designing the turbine bucket construction;
(b) testing the turbine bucket for high cycle fatigue problems based on a natural frequency of the turbine bucket; and
(c) after steps (a) and (b), altering the natural frequency of the turbine bucket by adding a rib in the internal cavity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification