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2025 | OriginalPaper | Buchkapitel

Expansion Techniques in the Modal Domain: Practical Implementation of M-SEMM and Comparative Study with SEREP

verfasst von : Miha Pogačar, Gregor Čepon, Miha Boltežar

Erschienen in: Dynamic Substructures, Vol. 4

Verlag: Springer Nature Switzerland

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Abstract

System equivalent model mixing (SEMM) is a substructuring-based dynamic expansion method that has recently undergone reformulation for its application in the modal domain, resulting in M-SEMM. This chapter aims to present the practical aspect of the method, beginning with a concise overview of the implementation-relevant equations. Subsequently, we introduce a substructuring laboratory testbench, for which a full-field response is obtained by laser scanning vibrometer. Different expansion case studies are examined, showcasing the capabilities of M-SEMM. Additionally, the performance of the method is compared to one of the most established expansion methods in the modal domain, system equivalent reduction/expansion process (SEREP). The results highlight the practicality and potential of M-SEMM as a novel modal expansion method.

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Vorheriges Kapitel Different Displacement Reduction Spaces for the Use in Admittance-Based TPA Methods

Nächstes Kapitel Comparing Frequency-Based and Modal-Based Substructuring on the Dynamic Substructuring Round Robin Benchmark

There are also nonmodel -based techniques [4, 5] which are not the focus of this chapter.

Although the concept has broader applications, in this chapter we will primarily focus on the parent model being numerical and the overlay being derived from experimental data.

Note that matrices \({\mathbf {L}}_{\text{m}}\), \(\tilde {\mathbf {M}}_{\text{m}}^{\mathrm {(hyb)}}\), and \(\tilde {\mathbf {K}}_{\text{m}}^{\mathrm {(hyb)}}\) are reevaluated for each k.

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Dascotte, E.: Model updating for structural dynamics: past, present and future outlook. In: International Conference on Engineering Dynamics (ICED), Carvoeiro, Algarve, pp. 16–18 (2007)

Chen, Y., Logan, P., Avitabile, P., Dodson, J.: Non-model based expansion from limited points to an augmented set of points using Chebyshev polynomials. Exp. Tech. 43(5), 521–543 (2019)CrossRef

Chen, Y., Avitabile, P., Page, C., Dodson, J.: A polynomial based dynamic expansion and data consistency assessment and modification for cylindrical shell structures. Mech. Syst. Signal Process. 154, 107574 (2021)CrossRef

O’Callahan, J.C., Avitabile, P., Riemer, R.: System equivalent reduction expansion process (SEREP). In: Proceedings of the VII International Modal Analysis Conference (IMAC), vol. 1, pp. 29–37. Society for Experimental Mechanics, Bethel (1989)

Thibault, L., Butland, A., Avitabile, P.: Variability improvement of key inaccurate node groups–VIKING. In: Topics in Modal Analysis II, vol. 6, pp. 603–624. Springer, Berlin (2012)

Klaassen, S.W. van der Seijs, M.V., de Klerk, D.: System equivalent model mixing. Mech. Syst. Signal Process. 105, 90–112 (2018)

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10.

Bregar, T., El Mahmoudi, A., Kodrič, M., Ocepek, D., Trainotti, F., Pogačar, M., Göldeli, M., Čepon, G., Boltežar, M., Rixen, D.J.: pyFBS: a python package for frequency based substructuring. J. Open Source Software 7(69), 3399 (2022)

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Titel: Expansion Techniques in the Modal Domain: Practical Implementation of M-SEMM and Comparative Study with SEREP
verfasst von: Miha Pogačar
Gregor Čepon
Miha Boltežar
Verlag: Springer Nature Switzerland
Buch: Dynamic Substructures, Vol. 4
Print ISBN: 978-3-031-68896-6

Electronic ISBN: 978-3-031-68897-3

Copyright-Jahr: 2025
DOI: https://doi.org/10.1007/978-3-031-68897-3_9

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