The TRChallenge – Experimental quantification of nonlinear modal parameters and confrontation with the predictions

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204-IMAC41_The TRChallenge – Experimental quantification of nonlinear modal parameters and confrontation with the predictions_2023.pdf

Date

2023-2-13

Author

Özgüven, Hasan Nevzat
Bhattu, Arati
Jamia, Nidhal
Hermann, Svenja
Muller, Florian
Scheel, Maren
Schwingshackl, Christoph
Krack, Malte

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In recent years, the prediction of the behavior of structures with high-level nonlinearities has been a challenging area of research. In 2021, the Tribomechadynamics Research Challenge was proposed to evaluate the current state of the art in modelling in the community of jointed structures: the task was a blind prediction of the nonlinear dynamic response of a system including a frictional and a geometric nonlinearity. Participants of the challenge were given only the technical drawings, including mate rial and surface specifications required to manufacture and assemble the system and were asked to predict the frequency and damping ratio of the lowest-frequency elastic mode as function of the amplitude. The behavior of the real system was exper imentally characterized during the Tribomechadynamics Research Camp 2022. This contribution presents the experimental work performed during the research camp. As the nature of the structure requires a base excitation, two recently developed nonlinear testing techniques have been explored to extract the modal parameters: the response-controlled testing method and the phase-resonant testing method. The results obtained with the different methods are compared and the blind predictions are confronted with the experimental results in order to assess their accuracy.

Subject Keywords

Frictional and geometric non-linearity, Backbone curve, Phased-Locked-Loop, Tribomechadynamics

URI

https://hdl.handle.net/11511/105231
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85175947440&origin=inward

DOI

https://doi.org/https://doi.org/10.1007/978-3-031-36999-5_18

Conference Name

IMAC-XLI Conference and Exposition on Structural Dynamics (February 13-16, 2023)

Collections

Department of Mechanical Engineering, Conference / Seminar

Citation Formats

H. N. Özgüven et al., “The TRChallenge – Experimental quantification of nonlinear modal parameters and confrontation with the predictions,” presented at the IMAC-XLI Conference and Exposition on Structural Dynamics (February 13-16, 2023), Austin, TX, 2023, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/105231.