Method for Analysis of Nonlinear Multiharmonic Vibrations of Mistuned Bladed Disks with Scatter of Contact Interface Characteristics

EP Petrov, D Ewins

Research output: Contribution to journalArticle (Academic Journal)peer-review

66 Citations (Scopus)

Abstract

An efficient method for analysis of nonlinear vibrations of mistuned bladed disk assemblies has been developed. This development has facilitated the use of large-scale finite element models for realistic bladed disks, used hitherto in analysis of linear vibration, to be extended for the analysis of nonlinear multiharmonic vibration. The new method is based on a technique for the exact condensation of nonlinear finite element models of mistuned bladed disks. The model condensation allows the size of the nonlinear equations to be reduced to the number of degrees of freedom where nonlinear interaction forces are applied. The analysis of nonlinear forced response for simplified and realistic models of mistuned bladed disks has been performed. For a practical high-pressure bladed turbine disk, several types of nonlinear forced response have been considered, including mistuning by (i) scatter of underplatform dampers, (ii) shroud gap scatter, and (iii) blade frequency scatter in the presence of nonlinear shroud interactions.
Translated title of the contributionMethod for Analysis of Nonlinear Multiharmonic Vibrations of Mistuned Bladed Disks with Scatter of Contact Interface Characteristics
Original languageEnglish
Pages (from-to)128 - 136
Number of pages9
JournalJournal of Turbomachinery
Volume127 (1)
DOIs
Publication statusPublished - Jan 2005

Bibliographical note

Publisher: ASME American Society of Mechanical Engineers

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