Non-linear periodic response analysis of mistuned bladed disk assemblies in modal domain

Date

2008-09

Author

Orbay, Günay
Özgüven, Hasan Nevzat

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

34
views

22
downloads

Cite This

Mistuning phenomenon has been studied extensively for almost half a century,especially for bladed disk assemblies. However, the studies hitherto focus on either linear models with distributed parameter mistuning or nonlinear models with pointmistuning. The former method is not realistic under significant non-linear effects.Whereas the latter method lacks accuracy since discrete mistuning elements distortthe mode shapes unless their numbers are large. Therefore a model which includes both nonlinearities and distributed parameter mistuning is required. In this study, aformulation for the analysis of mistuned bladed disk assemblies under periodic loadsin the presence of distributed parameter mistuning and nonlinearity is given. The proposed method combines the component mode synthesis based reduced order modeling approach with non-linear forced response analysis technique in modalspace. The calculations are carried out in modal domain which reduces thecomputational effort considerably, especially for large size finite element (FE)models. The mistuning is imposed on individual blade natural frequencies, which ismore realistic compared to adding discrete mistuning elements. A case study is presented to demonstrate the application of the method and the effect of macro-slipfriction type nonlinearity on the dynamic analysis of a mistuned bladed disk assembly. It is concluded that considering non-linear effects in the dynamic analysisof mistuned bladed disks is crucial when there exists significant non-linearity, suchas gaps and friction dampers in the system. It is believed that this is the first studyin which non-linear dynamic analysis of bladed disk assemblies is carried out withdistributed parameter mistuning.

Subject Keywords

Finite element method

URI

https://hdl.handle.net/11511/105133

Collections

Department of Mechanical Engineering, Conference / Seminar