Modal testing of a composite bladed disc using travelling wave excitation method

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This research article presents a novel application of travelling wave excitation method applied to a composite bladed disc. The objective of this work is to develop a non-contact excitation method for research applications where (i) blades are non-ferromagnetic and (ii) damping is nominally high. This goal was achieved by spinning a disc, on which 14 powerful DC magnets were installed, in front the composite bladed disc. Small DC magnets were attached near each blade root to provide repellent forces. Twenty blades were manufactured with pre-pregs IM7–8552, using unidirectional stacking sequence and were installed on a rigid metallic mounting hub. The paper will present the design and make of the bladed disc, the theoretical study of normal and tangential forces in a magnet-to-magnets configuration and, finally, the experimental validation of a 14-DC magnetic exciter. The forced responses were measured in one test case by a 3D single point LDV system and in another test case by a Scanning LDV system. This work will also present an attempt to develop a DC electromagnetic exciter with its limitation and potential.


Original languageEnglish
Title of host publicationTopics in Modal Analysis and Testing, Volume 9 - Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
EditorsMichael Mains, Brandon J. Dilworth
PublisherSpringer Science and Business Media, LLC
Number of pages17
ISBN (electronic)978-3-319-74700-2
ISBN (print)978-3-319-74699-9
Publication statusPublished - 2019

Publication series

SeriesConference Proceedings of the Society for Experimental Mechanics Series


Title36th IMAC, A Conference and Exposition on Structural Dynamics, 2018
Duration12 - 15 February 2018
City[state] FL
CountryUnited States of America

External IDs

ORCID /0000-0003-1626-9322/work/142240028



  • Composites, Excitation methods, Vibration testing