In the field of turbomachinery, the assumption of cyclic symmetry of rotor stages is usually made to lower the required computational resources. However, in reality, small random blade-to-blade variations, known as mistuning, appear due to manufacturing tolerances, etc. and disturb the dynamic behavior of bladed disks. In this work, an experimental modal analysis is performed on a mono-stage and monobloc academic bladed structure. The frequency response function (FRF) is measured using a base excitation with an electrodynamic shaker and one measurement point per blade. The mistuning of the structure is identified. Then, an optical geometry measurement system is used to obtain the exact geometry of each blade. Based on these optical data, a finite element model of the structure is constructed and the FRF of this model is compared to the experimental FRF. The accurate measurement of the geometry allows to compare the level of geometry mistuning of the academic structure with the identified frequency mistuning.
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ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
June 15–19, 2015
Montreal, Quebec, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5677-2
PROCEEDINGS PAPER
Experimental Modal Identification of Mistuning in an Academic Blisk and Comparison With the Blades Geometry Variations Available to Purchase
Florence Nyssen,
Florence Nyssen
University of Liege, Liege, Belgium
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Maarten Arnst,
Maarten Arnst
University of Liege, Liege, Belgium
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Jean-Claude Golinval
Jean-Claude Golinval
University of Liege, Liege, Belgium
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Florence Nyssen
University of Liege, Liege, Belgium
Maarten Arnst
University of Liege, Liege, Belgium
Jean-Claude Golinval
University of Liege, Liege, Belgium
Paper No:
GT2015-43436, V07BT32A027; 10 pages
Published Online:
August 12, 2015
Citation
Nyssen, F, Arnst, M, & Golinval, J. "Experimental Modal Identification of Mistuning in an Academic Blisk and Comparison With the Blades Geometry Variations." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Montreal, Quebec, Canada. June 15–19, 2015. V07BT32A027. ASME. https://doi.org/10.1115/GT2015-43436
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