0
research-article

An Efficient Approach for the Frequency Analysis of Non-Axisymmetric Rotating Structures: Application to a Coupled Bladed Bi-Rotor System

[+] Author and Article Information
Cécile Dumartineix

École Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR-CNRS 5513, 69134 Écully cedex, France; Safran Aircraft Engines, Rond Point René Ravaud − Réau, 77550 Moissy-Cramayel, France
cecile.dumartineix@doctorant.ec-lyon.fr

Benjamin Chouvion

École Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR-CNRS 5513, 69134 Écully cedex, France
benjamin.chouvion@ec-lyon.fr

Fabrice Thouverez

École Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR-CNRS 5513, 69134 Écully cedex, France
fabrice.thouverez@ec-lyon.fr

Marie-Océane Parent

Safran Aircraft Engines, Rond Point René Ravaud − Réau, 77550 Moissy-Cramayel, France
marieoceane.parent@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4040865 History: Received June 26, 2018; Revised July 04, 2018

Abstract

The improvement of efficiency in the design of turbomachines requires a reliable prediction of the vibrating behavior of the whole structure. The simulation of blades vibrations is decisive and this is usually based on elaborated finite element model re- stricted to the bladed-disk. However the blades dynamic behavior can be strongly affected by interactions with other parts of the engine. Global dynamic studies that consider these other parts are required but usually come with a high numerical cost. In the case of a bi-rotor architecture, two coaxial rotors with different rotating speed can be coupled with a bearing system. The me- chanical coupling between the shafts generates energy exchange that alters the dynamic behavior of the blades. The equations of motion of the whole structure that take into account the coupling contain periodic time-dependent coefficients due to the difference of rotational speed between both rotors. Equations of this kind, with variable coefficients, are typically difficult to solve. This study presents a preprocessing method to guarantee the elimi- nation of time-dependent coefficients in the bi-rotor equations of motion. This method is tested with a simplified finite element model of two bladed-disks coupled with linear stiffnesses. We obtain accurate results when comparing frequency analysis of preprocessed equations with time-integration resolution of the initial set of equations. The developed methodology also offers a substantial time saving.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In