A comparison of two modal analysis methods: An impact hammer versus laser vibrometry
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Date
2020-11-19
Authors
Krejčí, Jakub
Beneš, Petr
0000-0001-6289-5119Advisor
Referee
Mark
Journal Title
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Volume Title
Publisher
Czech Technical University in Prague
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Abstract
This paper presents a comparative experimental-analytical study on the performance of Multi-Input Single-Output (MISO) and Single-Input Multi-Output (SIMO) techniques to identify the modal properties of a cantilever beam. A 2-D laser interferometry was employed to perform the SIMO modal test, while for the MISO test configuration, a conventional accelerometer was used to measure the response of the structure. Comparing the experimentally-measured natural frequencies with those calculated by the FEM model, a maximum difference of 4% between natural frequencies was observed. The repeatability of both techniques is also investigated in this paper and it is shown that the difference between modal properties identified under different operators is less than 0.5% for both the MISO and SIMO techniques.
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Citation
Acta Polytechnica (on-line). 2020, vol. 60, issue 5, p. 420-427.
https://ojs.cvut.cz/ojs/index.php/ap/article/view/6050
https://ojs.cvut.cz/ojs/index.php/ap/article/view/6050
Document type
Peer-reviewed
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en