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Multi-level curvature-based parametrization and model updating using a 3D full-field response
ID Zaletelj, Klemen (Author), ID Gorjup, Domen (Author), ID Slavič, Janko (Author), ID Boltežar, Miha (Author)

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Abstract
Model updating improves the correlation between the response of the real structure and the response of the finite-element (FE) model; however, the selection of the updating parameters (parametrization) is crucial for its success. Using full-field modal shapes, a large number of parameters can be updated, e.g., the Young’s moduli of all the finite elements; however, the structural response is not necessarily sensitive to an arbitrary parameter, making the optimization problem ill-conditioned. Additionally, the computation of the full sensitivity matrix is not feasible for relatively large FE models. Not all locations are equally important for model updating; at locations of the highest mechanical loads, more focus is required. In this research, the updating parameters are based on the curvature of the 3D full-field experimental shape, where locations with high curvature are associated with high sensitivity. The assumption is initially researched with the Euler–Bernoulli beam elements and second-order tetrahedrons. The proposed method is investigated on numerical and real experiments, where successful updating was confirmed. With the proposed parametrization and updating approach, a geometrically complex structure is parametrized and the parameters updated without significant user input, generalizing the model-updating procedure.

Language:English
Keywords:FE model updating, interior point method, curvature-based parametrization, frequency-domain triangulation
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2023
Number of pages:15 str.
Numbering:Vol. 187, art. 109927
PID:20.500.12556/RUL-142702 This link opens in a new window
UDC:535:004.9(045)
ISSN on article:0888-3270
DOI:10.1016/j.ymssp.2022.109927 This link opens in a new window
COBISS.SI-ID:130115331 This link opens in a new window
Publication date in RUL:21.11.2022
Views:305
Downloads:104
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Record is a part of a journal

Title:Mechanical systems and signal processing
Shortened title:Mech. syst. signal process.
Publisher:Elsevier
ISSN:0888-3270
COBISS.SI-ID:169243 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Keywords:modelno posodabljanje, metoda notranje točke, parametrizacija ukrivljenosti, triangulacija v frekvenčni domeni

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0263
Name:Mehanika v tehniki

Funder:ARRS - Slovenian Research Agency
Project number:J2-1730
Name:Polno zaznavanje prostorskih vibracij s hitro kamero z aplikacijami v digitalnih dvojčkih in oddaljenem zaznavanju

Funder:ARRS - Slovenian Research Agency
Project number:N2-0144
Name:Optična metoda za obratovalno identifikacijo reduciranega nelinearnega modela

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