Article (Scientific journals)
Experimental modal identification of mistuning in an academic two-stage drum
Nyssen, Florence; Epureanu, Bogdan; Golinval, Jean-Claude
2016In Mechanical Systems and Signal Processing
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Keywords :
Bladed disks; multi-stage; mistuning identification
Abstract :
[en] Various assumptions are often made to model turbomachinery bladed assemblies. In particular, the cyclic symmetry of single rotor stages, and dynamically independence of isolated rotor stages are frequently used. The first assumption enables a drastic reduction of the required computational resources by considering only one sector instead of the entire assembly to model and analyze the dynamic behavior of the complete structure. However, small random blade-to-blade structural variations, known as mistuning, exist due to manufacturing tolerances, etc. and significantly affect the dynamic behavior of bladed disks. The second assumption also reduces the needed computational resources and time. However, ignore inter-stage coupling does not always describe accurately the disk or drum flexibility especially at the inter-stage boundaries. In this work, the component mode mistuning method is used for multi-stage assemblies to create a mistuning identification approach. An experimental modal analysis is performed on a two-stage monobloc academic bladed drum. The frequency response function is measured using a base excitation with an electrodynamic shaker and one measurement point per blade of each stage is used. The approach is used to identify mistuning in a multi-stage rotor. Numerical and experimental results are presented. Results show that the proposed approach is effective even for modes which are multi-stage.
Research center :
Aerospace and Mechanical Engineering Department, Univeristy of Liege
Mechanical Engineering Department, University of Michigan
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Nyssen, Florence ;  Université de Liège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Epureanu, Bogdan;  University of Michigan > Mechanical Engineering Department
Golinval, Jean-Claude  ;  Université de Liège > Département d'aérospatiale et mécanique > LTAS - Vibrations et identification des structures
Language :
English
Title :
Experimental modal identification of mistuning in an academic two-stage drum
Publication date :
2016
Journal title :
Mechanical Systems and Signal Processing
ISSN :
0888-3270
eISSN :
1096-1216
Publisher :
Academic Press, London, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 28 November 2016

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