Abstract
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.
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References
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Acknowledgment
The authors would like to thank F. Carstensen, S. Chauhan, D. Naylor, A. Tantalo Rolls-Royce graduate trainees to have supported this research study and Clive Rendall for his valuable suggestions on the design of the 14-DC magnetic exciter.
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© 2019 The Society for Experimental Mechanics, Inc.
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Di Maio, D., Vater, M., Seidel, R., Foglia, S. (2019). Modal Testing of a Composite Bladed Disc Using Travelling Wave Excitation Method. In: Mains, M., Dilworth, B. (eds) Topics in Modal Analysis & Testing, Volume 9. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-74700-2_4
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DOI: https://doi.org/10.1007/978-3-319-74700-2_4
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Online ISBN: 978-3-319-74700-2
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