Vibration damping structure of rotor blades

The rotor blade assembly with part-span shrouds and movable dampers addresses the inefficiencies of conventional damping methods by providing effective vibration reduction and extended blade life without additional weight or flow obstruction.

JP7888255B2Active Publication Date: 2026-07-13GENERAL ELECTRIC TECH GMBH
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Patent Information

Application Number
JP2021159807
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-09-30
Filing Date
2021-09-29
Publication Date
2026-07-13
Estimated Expiration
2041-09-29

AI Technical Summary

Technical Problem

Conventional vibration damping methods for turbomachine rotor blades, such as platform dampers and shrouds, are ineffective for short-shank blades and result in high-cycle fatigue and premature failure due to unsteady aerodynamic loads, while adding additional shrouds increases weight and flow path blockage.

Method used

A rotor blade assembly design featuring part-span shrouds with movable dampers, such as sleeve, insert, and pin dampers, that form interference joints and provide friction damping without significant weight or flow obstruction, enhancing vibration damping and rigidity.

Benefits of technology

The design effectively reduces vibrations and extends the life of rotor blades by increasing friction damping without compromising rigidity or causing flow path blockage, offering flexible and efficient vibration damping solutions.

✦ Generated by Eureka AI based on patent content.

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Abstract

To damp vibrations in a rotor blade assembly.SOLUTION: A rotor blade assembly includes a first rotor blade 48 and a second rotor blade 50 that are positioned adjacently to one another. The first rotor blade and the second rotor blade each include a platform and an airfoil 52 extending radially outward from a root coupled to the platform to a tip. The airfoil includes a part-span shroud 72, 73. The part-span shroud extends from the airfoil and is disposed between the root and the tip. The part-span shroud includes a pressure side portion 76 extending from a pressure side surface 54 and a suction side portion 74 extending from the suction side surface 56. A damper 100 is in contact with both the part span shroud of the first rotor blade and the part span shroud of the second rotor blade at an interference joint 75. The damper is movable relative to the part span shroud of both the first rotor blade and the second rotor blade.SELECTED DRAWING: Figure 6
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Citation Information

Patent Citations

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