Nonlinear Vibrational Analysis for Integrally Bladed Disk Using Frictional Ring Damper

Yekai Sun,Loïc Salles,Luca Pesaresi,Jie Yuan

doi:10.1088/1742-6596/1106/1/012026

Yekai Sun, Loïc Salles + Show 2 more

Open Access

https://doi.org/10.1088/1742-6596/1106/1/012026

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Abstract

The use of integrally bladed-disk is now very popular in turbomachinery industry since they feature significant aerodynamic and structural improvements along with a significant mass reduction. However, these integrated single structures can arise a major high cycle fatigue issue due to the lack of sufficient damping for dissipating the vibrational energy. This work describes a numerical investigation of the nonlinear dynamic behaviour and nonlinear normal mode for such a bladed-disk with frictional ring damper using the Harmonic Balanced Method (HBM) with alternating Fourier transformation. Jenkins element is used to model the nonlinear contact friction between the disc and ring damper. Using such a modeling strategy, the modal damping and resonance amplitude are directly and efficiently computed through nonlinear normal mode analysis. The initial results show the vibrational level on the blades can be effectively controlled by the parameters of the ring damper model. The effectiveness of ring damper and damping performance is evaluated. This study also indicates the nonlinear normal mode analysis based HBM may be an effective method to analyse the dynamic behaviour of the integrated bladed-disk with frictional ring damper.

Highlights

Blisk is one type of bladed-disk system used in turbomachinery analysis
The aeroelastic excitation on the blisk might cause severe vibration stress leading to high cycle fatigue (HCF)
HCF is regarded as a major reason for most of the failures in aero-engine

Summary

Introduction

Blisk is one type of bladed-disk system used in turbomachinery analysis It is key dynamic components in aircraft engine, which undergoes complicated operational environment with thermal loads, static fluid pressures and rotation-induced centrifugal loads [1]. In integrated bladed-disk, the rotor is manufactured in a single piece of component, in stead of an assembled structure with a disk and individual blade. For this reason, the conventional friction joints are no longer favorable due to lack of contact surfaces. The alternative method to introduce contact friction is defined as a ring underneath the blisk wheel This ring is used as a frictional damper to reduce the vibration of blisk [6]

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