Mode-oriented finite-element model updating for thin-walled ducts via point-wise time-harmonic simulations

Heidegger P, Czwielong F, Wurzinger A, Heigl C, Saur L, Schoder S, Reinbacher-Köstinger A, Becker S, Kaltenbacher M (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Book Volume: 31

Article Number: 111562

DOI: 10.1016/j.rineng.2026.111562

Abstract

Unspecified material properties and boundary conditions are common culprits for inaccurate vibro-mechanical finite-element predictions of thin-walled ducts. Updating inaccurate modeling assumptions can be challenging, especially when damping is non-negligible. This paper proposes a mode-oriented model-updating workflow that utilizes time-harmonic simulations evaluated only at estimated target-mode frequencies of a reference measurement, enabling straightforward consideration of linear damping. Simulated frequencies are paired with measured spectral bins via the maximum spatial coherence of their frequency-response-function vectors to construct the objective functions. Three variants of scalarized objective functions are investigated, optionally considering the frequency mismatches, spatial coherences, and vibration magnitudes of identified pairs. Parameter identification is performed using global optimization and surrogate models based on Random Forest regressors. Applicability is investigated across three damped, thin-walled scenarios of increasing complexity, evaluated at multiple training-simulation set sizes. S1 recovers known flange elasticity and frequency-constant damping in a simplified compound-structure model, S2 identifies 5 equivalent parameters for de-featured flanges and mountings to emulate a more detailed simulated reference, and S3 updates 14 parameters of a real ventilation-duct model, with laser Doppler vibrometry of the impact-hammer excited structure as reference. Validation is performed by comparing frequency-averaged spatial coherences and relative mean-squared errors within proximity bands across the frequency range. Results yield consistently improving surrogate predictions along increasing training-set sizes in all scenarios, successful recovery of target parameters in S1 , substantial improvements over a trivial baseline in S2 , and moderate improvements in S3 . Most robust performance is achieved by combining only frequency-shift and spatial-coherence penalties in the objective function.

Authors with CRIS profile

Involved external institutions

Technische Universität Graz Austria (AT)

How to cite

APA:

Heidegger, P., Czwielong, F., Wurzinger, A., Heigl, C., Saur, L., Schoder, S.,... Kaltenbacher, M. (2026). Mode-oriented finite-element model updating for thin-walled ducts via point-wise time-harmonic simulations. Results in Engineering, 31. https://doi.org/10.1016/j.rineng.2026.111562

MLA:

Heidegger, Patrick, et al. "Mode-oriented finite-element model updating for thin-walled ducts via point-wise time-harmonic simulations." Results in Engineering 31 (2026).

BibTeX: Download