Response of bladed disks with mistuned blade-disk interfaces

J. Avalos (1) , M. P. Mignolet (1) , Christian Soize (2)

1 Fac Mech & Aerosp Engn
2 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

This paper focuses on the determination of the effects on the bladed disk forced response of small variations (mistuning) in the blade-disk interface properties as may result from blade seating. A blade-interface-disk mean model is first developed that relies on both the Craig-Bampton approach and a local modeling of the interface. Then, both model and data uncertainties are introduced in this model using the nonparametric stochastic modeling approach. An example of application is presented that indicates a difference in physical behavior of a bladed disk with mistuned interfaces as compared to one with mistuned blade alone frequencies. Most notably, it is shown that at equal variability on the blade frequencies, the variations in blade-disk interface properties lead to a higher amplification factor.

Mots clés: uncertainty quantification; mistuning; mistuned; bladed disk; mistuned blades disk; nonparametric probabilistic approach; modeling errors; model uncertainty; stochastic modeling; random matrix; blade vibration; random unceratinties; localization phenomena; cyclic geometry

Domaines: Mécanique [physics.med-ph]; Probabilités [math.PR]; Vibrations [physics.class-ph]

J. Avalos, M. P. Mignolet, Christian Soize. Response of bladed disks with mistuned blade-disk interfaces. 54th ASME Turbo Expo 2009, ASME, Jun 2009, Orlando, FL, United States. pp.323-332. ⟨hal-00684611⟩