20.500.12556/RUL-148420 Strain experimental modal analysis of an Euler–Bernoulli beam based on the thermoelastic principle 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. thermoelastic principle strain shapes modal identification structural dynamics princip termoelastičnosti deformacijske lastne oblike modalna identifikacija strukturna dinamika true false true Angleški jezik Slovenski jezik Članek v reviji 2023-08-22 09:53:04 2023-08-22 09:53:06 2024-02-13 10:44:48 0000-00-00 00:00:00 2023 0 0 11 str. Vol. 201, art. 110655 Oct. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531.391:538.913 :510.643.5 1096-1216 10.1016/j.ymssp.2023.110655 161829379 Zaletelj...-Strain_experimental_modal_analysis_of_an_Euler–Bernoulli_beam_based_on_the_thermoelastic_principle.pdf Zaletelj...-Strain_experimental_modal_analysis_of_an_Euler–Bernoulli_beam_based_on_the_thermoelastic_principle.pdf 1 B63DD8EECDF0336E43C53074367A2DC4 ac7e7a606ec49d4986d08ceea37443e50e78ced80c4a7ffbe02e089ab6e9efdd 1ffe302f-40c1-11ee-b9d7-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172640 https://www.sciencedirect.com/science/article/pii/S0888327023005630 1 e26c8e4c-40c0-11ee-b9d7-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172639 Fakulteta za strojništvo 0 0 0