Local/global effects of mistuning on the forced response of bladed disks

A. J. Rivas-Guerra, Marc Mignolet

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The focus of the present investigation is on the assessment and modeling of the local (spanning only a few blades) and global (encompassing the entire disk) effects of mistuning on the forced response of bladed disks. To this end, the concept of localization is first revisited and a new measure of this effect is introduced in terms of the number of blades the mistuning of which actually affects the forced response of a central blade. Using this new metric, it is demonstrated that high responding blades typically exhibit a high level of localization and that the reverse is not necessarily true. Thus, localization is not only disk dependent but also varies from blade-to-blade on the same disk. This observation is then used to validate a partial mistuning approach to the determination of the maximum amplitude of response over the entire population of disks. The results of this study indicate that the largest amplification due to the mistuning occurs at very strong blade-to-blade coupling levels, at the contrary of a general perception, but is associated with large mistuning levels. Finally, the above phenomenological observations are used to devise a modeling technique of both local and global components of mistuning. An example of application is presented that demonstrates the high accuracy of this approach through the entire blade-to-blade coupling domain.

Original languageEnglish (US)
Pages (from-to)131-141
Number of pages11
JournalJournal of Engineering for Gas Turbines and Power
Volume126
Issue number1
DOIs
StatePublished - Jan 2004

Fingerprint

Amplification

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Local/global effects of mistuning on the forced response of bladed disks. / Rivas-Guerra, A. J.; Mignolet, Marc.

In: Journal of Engineering for Gas Turbines and Power, Vol. 126, No. 1, 01.2004, p. 131-141.

Research output: Contribution to journalArticle

@article{1c5f966cb1d84ffe8026d197c185fdda,
title = "Local/global effects of mistuning on the forced response of bladed disks",
abstract = "The focus of the present investigation is on the assessment and modeling of the local (spanning only a few blades) and global (encompassing the entire disk) effects of mistuning on the forced response of bladed disks. To this end, the concept of localization is first revisited and a new measure of this effect is introduced in terms of the number of blades the mistuning of which actually affects the forced response of a central blade. Using this new metric, it is demonstrated that high responding blades typically exhibit a high level of localization and that the reverse is not necessarily true. Thus, localization is not only disk dependent but also varies from blade-to-blade on the same disk. This observation is then used to validate a partial mistuning approach to the determination of the maximum amplitude of response over the entire population of disks. The results of this study indicate that the largest amplification due to the mistuning occurs at very strong blade-to-blade coupling levels, at the contrary of a general perception, but is associated with large mistuning levels. Finally, the above phenomenological observations are used to devise a modeling technique of both local and global components of mistuning. An example of application is presented that demonstrates the high accuracy of this approach through the entire blade-to-blade coupling domain.",
author = "Rivas-Guerra, {A. J.} and Marc Mignolet",
year = "2004",
month = "1",
doi = "10.1115/1.1581898",
language = "English (US)",
volume = "126",
pages = "131--141",
journal = "Journal of Engineering for Gas Turbines and Power",
issn = "0742-4795",
publisher = "American Society of Mechanical Engineers(ASME)",
number = "1",

}

TY - JOUR

T1 - Local/global effects of mistuning on the forced response of bladed disks

AU - Rivas-Guerra, A. J.

AU - Mignolet, Marc

PY - 2004/1

Y1 - 2004/1

N2 - The focus of the present investigation is on the assessment and modeling of the local (spanning only a few blades) and global (encompassing the entire disk) effects of mistuning on the forced response of bladed disks. To this end, the concept of localization is first revisited and a new measure of this effect is introduced in terms of the number of blades the mistuning of which actually affects the forced response of a central blade. Using this new metric, it is demonstrated that high responding blades typically exhibit a high level of localization and that the reverse is not necessarily true. Thus, localization is not only disk dependent but also varies from blade-to-blade on the same disk. This observation is then used to validate a partial mistuning approach to the determination of the maximum amplitude of response over the entire population of disks. The results of this study indicate that the largest amplification due to the mistuning occurs at very strong blade-to-blade coupling levels, at the contrary of a general perception, but is associated with large mistuning levels. Finally, the above phenomenological observations are used to devise a modeling technique of both local and global components of mistuning. An example of application is presented that demonstrates the high accuracy of this approach through the entire blade-to-blade coupling domain.

AB - The focus of the present investigation is on the assessment and modeling of the local (spanning only a few blades) and global (encompassing the entire disk) effects of mistuning on the forced response of bladed disks. To this end, the concept of localization is first revisited and a new measure of this effect is introduced in terms of the number of blades the mistuning of which actually affects the forced response of a central blade. Using this new metric, it is demonstrated that high responding blades typically exhibit a high level of localization and that the reverse is not necessarily true. Thus, localization is not only disk dependent but also varies from blade-to-blade on the same disk. This observation is then used to validate a partial mistuning approach to the determination of the maximum amplitude of response over the entire population of disks. The results of this study indicate that the largest amplification due to the mistuning occurs at very strong blade-to-blade coupling levels, at the contrary of a general perception, but is associated with large mistuning levels. Finally, the above phenomenological observations are used to devise a modeling technique of both local and global components of mistuning. An example of application is presented that demonstrates the high accuracy of this approach through the entire blade-to-blade coupling domain.

UR - http://www.scopus.com/inward/record.url?scp=13644269619&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=13644269619&partnerID=8YFLogxK

U2 - 10.1115/1.1581898

DO - 10.1115/1.1581898

M3 - Article

AN - SCOPUS:13644269619

VL - 126

SP - 131

EP - 141

JO - Journal of Engineering for Gas Turbines and Power

JF - Journal of Engineering for Gas Turbines and Power

SN - 0742-4795

IS - 1

ER -