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Strain experimental modal analysis of an Euler–Bernoulli beam based on the thermoelastic principle
ID Zaletelj, Klemen (Author), ID Slavič, Janko (Author), ID Šonc, Jaša (Author), ID Boltežar, Miha (Author)

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Abstract
The strain mode shapes can be utilized as an indicator of vibration fatigue-hotspots and are utilized for predicting the distribution of damage intensity. However, the conventional approach for measurement, which involves using strain sensors, does not offer the necessary high spatial density required for accurately identifying critical locations or creating a comprehensive map of damage intensity. Non-contact methods have been employed to indirectly determine the full-field strain shapes, but when measuring kinematic quantities, a relation between kinematics and stress/strain must be known. For Euler–Bernoulli beam, the double spatial derivative is required which introduces a significant uncertainty. In contrast, by leveraging the thermoelastic principle, the full-field stress/strain response of an arbitrary structure can be directly measured using a high-speed infrared (IR) camera. The thermoelastic principle has not been extensively researched for strain experimental modal analysis (EMA). In this study, the hybrid EMA (based on one high-dynamic range sensor) was researched for thermoelastic identification of an Euler–Bernoulli beam. The minimum stress/temperature variation required to achieve accuracy comparable to scanning-laser kinematics-based strain mode shapes was investigated. The findings demonstrate that even when the noise floor is significantly higher than the signal, full-field strain mode shapes can be identified using IR cameras and the hybrid EMA method. By considering the minimum stress/temperature variation determined in this research (for aluminum and steel), the accuracy of thermoelasticity-based strain shapes can be evaluated during the experiment-design stage. While this research is theoretically and experimentally based on Euler–Bernoulli beam, generalization of the thermoelastic principle to arbitrary structure is feasible.

Language:English
Keywords:thermoelastic principle, strain shapes, modal identification, structural dynamics
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:11 str.
Numbering:Vol. 201, art. 110655
PID:20.500.12556/RUL-148420 This link opens in a new window
UDC:531.391:538.913 :510.643.5
ISSN on article:1096-1216
DOI:10.1016/j.ymssp.2023.110655 This link opens in a new window
COBISS.SI-ID:161829379 This link opens in a new window
Publication date in RUL:22.08.2023
Views:247
Downloads:51
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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:1096-1216
COBISS.SI-ID:15296283 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:princip termoelastičnosti, deformacijske lastne oblike, modalna identifikacija, strukturna dinamika

Projects

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

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

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