Reduced order models (ROMs) of turbine bladed disks (blisks) are essential to quickly yet accurately characterize vibration characteristics and effectively design for high cycle fatigue. Modeling blisks with contacting shrouds at adjacent blades is especially challenging due to friction damping and localized non-linearities at the contact interfaces which can lead to complex stick-slip behavior. While well-known techniques such as the harmonic balance method and Craig-Bampton component mode synthesis have generally been employed to generate ROMs in the past, they do not reduce degrees of freedom (DoFs) at the interfaces themselves. In this paper we propose a novel method to obtain a set of reduction basis functions for the contact interface DoFs as well as the remaining DoFs called adaptive microslip projection (AMP). The method is based on analyzing a set of linear systems with specifically chosen boundary conditions on the contact interface. Simulated responses of full order baseline models and the novel ROMs under various conditions are studied. Results obtained from the ROMs compare very favorably with the baseline model. The AMP procedure is also easily generalizable to other dynamic systems with Coulomb friction contacts.
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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
Adaptive Microslip Projection (AMP) for Reduction of Frictional and Contact Non-Linearities in Shrouded Blisks Available to Purchase
Mainak Mitra,
Mainak Mitra
University of Michigan, Ann Arbor, MI
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Stefano Zucca,
Stefano Zucca
Politecnico di Torino, Torino, Italy
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Bogdan I. Epureanu
Bogdan I. Epureanu
University of Michigan, Ann Arbor, MI
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Mainak Mitra
University of Michigan, Ann Arbor, MI
Stefano Zucca
Politecnico di Torino, Torino, Italy
Bogdan I. Epureanu
University of Michigan, Ann Arbor, MI
Paper No:
GT2015-43967, V07BT32A032; 16 pages
Published Online:
August 12, 2015
Citation
Mitra, M, Zucca, S, & Epureanu, BI. "Adaptive Microslip Projection (AMP) for Reduction of Frictional and Contact Non-Linearities in Shrouded Blisks." Proceedings of the ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Montreal, Quebec, Canada. June 15–19, 2015. V07BT32A032. ASME. https://doi.org/10.1115/GT2015-43967
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