Response of Bladed Disks With Mistuned Blade-Disk Interfaces

Abstract

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.

A reduced order model based on sector mistuning for the dynamic analysis of mistuned bladed disks

“…In order to fill this gap, they proposed an alternative mistuning model, which considers the frequency deviation of the whole sector. The importance of the blade-to-disk interface mistuning has been recently confirmed by Mignolet et al in [22]: considering the FE model of a nonintegral bladed disk, they showed how the highest forced response amplifications obtained with a mistuning pattern in the disk-to-blade interfaces can be compared to those occurring when only the blades are mistuned.…”

Nonparametric Stochastic Modeling of Structures with Uncertain Boundary Conditions/Coupling Between Substructures

“…as in bladed disks (see [6]) or in wings near flutter as shown here. Note that both model and parameter uncertainties are in American Institute of Aeronautics and Astronautics 3 general present.…”

Uncertainty and global sensitivity analysis of bladed disk statics with material anisotropy and root geometry variations

“…Qin et al studied the effect of geometry mismatch in fir tree joints on the natural frequency of a blade by varying the surfaces where contact or gap exists. Avalos et al investigated the effects of blade‐disk interface mistuning on the force response amplification of bladed disks.…”