Effects of harmonic intentional mistuning on the free response of bladed disks

Michael E. Brewer, Matthew P. Castanier, Christophe Pierre

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

13 Scopus citations

Abstract

In this paper, the free response of bladed disks with intentional mistiming is considered in detail. A simple lumped-parameter model of a bladed disk is employed. Intentional mistuning is included by applying a sinusoidal variation to the nominal blade stiffnesses. It is shown that if the intentional mistuning harmonic number and the number of blades have a common integer factor greater than one, then the eigenvalue problem reduces to a set of smaller problems. It is found that the ratio of intentional mistuning strength to the interblade coupling strength is a key parameter for the free response. As this ratio increases, the modes become localized. More importantly, the modes of the intentionally mistuned system have several non-zero nodal diameter components, in contrast to the tuned system which has pure nodal diameter modes. Furthermore, if only random mistuning is present, each mode of the bladed disk assembly still retains a strong nodal diameter component. However, the modes of the system with intentional mistuning and random mistuning tend to have more evenly distributed nodal diameter components. This shows why intentional mistuning can be effective in reducing the maximum blade forced response for engine order excitation.

Original languageEnglish
Title of host publication17th Biennial Conference on Mechanical Vibration and Noise
Pages1873-1884
Number of pages12
ISBN (Electronic)9780791880395
DOIs
StatePublished - 1999
EventASME 1999 Design Engineering Technical Conferences, DETC 1999 - Las Vegas, United States
Duration: 12 Sep 199916 Sep 1999

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
Volume7B-1999

Conference

ConferenceASME 1999 Design Engineering Technical Conferences, DETC 1999
Country/TerritoryUnited States
CityLas Vegas
Period12/09/9916/09/99

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