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

D. Di Maio*, M. Vater, R. Seidel, S. Foglia

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)


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
Subtitle of host publicationProceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
EditorsBrandon J. Dilworth, Michael Mains
Place of PublicationCham
Number of pages17
ISBN (Electronic)978-3-319-74700-2
ISBN (Print)978-3-319-74699-9
Publication statusPublished - 2019
Externally publishedYes
Event36th Conference and Exposition on Structural Dynamics, IMAC 2018 - Orlando, United States
Duration: 12 Feb 201815 Feb 2018
Conference number: 36

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652


Conference36th Conference and Exposition on Structural Dynamics, IMAC 2018
Abbreviated titleIMAC
Country/TerritoryUnited States
Internet address


  • Composites
  • Excitation methods
  • Vibration testing


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