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Nonlinear Phase Separation Testing of an Experimental Wing-Engine Structure

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationRotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry
Subtitle of host publicationProceedings of the 35th IMAC, A Conference and Exposition on Structural Dynamics 2017
Publisher or commissioning bodySpringer
Number of pages2
ISBN (Electronic)978-3-319-54648-3
DateAccepted/In press - 30 Jan 2017
DatePublished (current) - 28 Mar 2017

Publication series

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


Modal testing of nonlinear engineering structures is currently a research area that attracts substantial attention. Recently, a nonlinear generalisation of phase separation testing has been proposed for identifying nonlinear normal modes (NNMs) based on input and output measurements. The nonlinear phase separation (NPS) method integrates identification and continuation tools to calculate multiple NNMs from broadband data. The present contributionr reports the first experimental application of the NPS method. The structure of interest is a model inspired by a wing with two engines connected by means of nonlinear pylons with softening-hardening stiffness characteristics. The frequency-energy dependences of four NNMs in the 0-100 Hz range are estimated, including modal interactions. NNMs identified using the NPS method are also compared to free-decay testing results

    Research areas

  • nonlinear normal modes, experimental identification, broadband excitation, experimental model, discrete- time continuation

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Springer at Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2.19 MB, PDF document



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