Dynamic modeling and vibration analysis of mistuned bladed disks

Gísli Óttarsson (1)

1 Vibrations and acoustics laboratory

One of the most important problems that plague turbomachinery rotors is the existence of rogue blades -- lone blades that exhibit unexpected fatigue failure. It has been recognized that rotor mistuning might be the cause of rogue blades through a phenomenoncalled normal mode localization, whereby vibration energy is confined to a few blades of the assembly. The goals of this dissertation are (1) to achieve a thorough understanding of the fundamental mechanisms governing mistuning effects, (2) the development of mathematical models of turbomachinery rotors suitable for mistuning analysis, and (3) the development of techniques for designers interested in the mistuning sensitivity of a particular rotor design.

Mots clés: mistuning; bladed-disk assemblies; localization; lumped models

Domaines: Mécanique [physics.med-ph]

Gísli Óttarsson. Dynamic modeling and vibration analysis of mistuned bladed disks. Mechanics [physics.med-ph]. University of Michigan, 1994. English. ⟨NNT : ⟩. ⟨tel-00598068⟩