Correlation of tuned free vibration characteristics with mistuning sensitivity for a bladed disk

Mahmoud I. Hussein, Christophe Pierre, Matthew P. Castanier

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations

Abstract

The inevitable occurrence of blade mistuning in turbomachinery rotors is known to cause vibration localization among the blades. This in turn increases the likelihood of an excessive vibration response at certain conditions, thus posing a major safety concern. This problem motivates the exploration of the various factors that affect the degree to which the response of a bladed disk increases as a result of mistuning. This paper shows that there is a correlation between the tuned system free vibration characteristics and the mistuned system forced response. More specifically, there is a three-way link among (1) the properties of the tuned structure eigenfrequency curves, (2) physical notions such as disk/blade participation and structural interblade coupling, and (3) the sensitivity of the blades' response to mistuning. These correlations are established by comparing a large set of mistuned forced response data to the tuned free vibration characteristics for a model of an industrial bladed disk. The forced response calculations are obtained using a reduced order modeling methodology. Although the results presented pertain specifically to the bladed disk considered, some of the ideas and conclusions could be extended to bladed disk structures in general. On this basis, some guidelines are presented that could serve as an inexpensive design tool for assessing mistuning sensitivity for bladed disks solely relying on tuned free response information.

Original languageEnglish
Pages (from-to)1341-1358
Number of pages18
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume2
StatePublished - 2003
Event44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference - Norfolk, VA, United States
Duration: 7 Apr 200310 Apr 2003

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