Predicting blade stress levels directly from reduced-order vibration models of mistuned bladed disks

Sang Ho Lim, Christophe Pierre, Matthew P. Castanier

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The forced vibration response of bladed disks can increase dramatically due to blade mistuning, which can cause major durability and reliability problems in turbine engines. To predict the mistuned forced response efficiently, several reduced-order modeling techniques have been developed. However, for mistuned bladed disks, increases in blade amplitude levels do not always correlate well with increases in blade stress levels. The stress levels may be computed by postprocessing the reduced-order model results with finite element analysis, but this is cumbersome and expensive. In this work, three indicators that can be calculated directly from reduced-order models are proposed as a way to estimate blade stress levels in a straightforward, systematic, and inexpensive manner. It is shown that these indicators can be used to predict stress values with good accuracy relative to finite element results, even for a case in which the displacement and stress levels show different frequency response trends.

Original languageEnglish
Pages (from-to)206-210
Number of pages5
JournalJournal of Turbomachinery
Volume128
Issue number1
DOIs
StatePublished - Jan 2006

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