Non-contact modal testing by the electromagnetic acoustic principle: Applications to bending and torsional vibrations of metallic pipes

This work aims to investigate a possibility of non-contact vibration modal testing for bending and torsional motions of cylindrical bodies such as pipes. Here, a transducer operated by the electromagnetic acoustic coupling principle is newly devised. Depending on vibration modes, bending or torsiona...

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Bibliographic Details
Published inJournal of sound and vibration Vol. 332; no. 4; pp. 740 - 751
Main Authors Kim, Hongjin, Park, Chan Il, Lee, Sun Ho, Kim, Yoon Young
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 18.02.2013
Subjects
Bend tests
Bending
Cylindrical bodies
Pipe
Torsional vibration
Transducers
Vibration
Vibration mode
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Summary:This work aims to investigate a possibility of non-contact vibration modal testing for bending and torsional motions of cylindrical bodies such as pipes. Here, a transducer operated by the electromagnetic acoustic coupling principle is newly devised. Depending on vibration modes, bending or torsional, different magnetic circuit configurations are employed to fabricate the transducer. The main characteristic of the proposed transducer is non-contact vibration generation in a test specimen without any mechanical movement of the actuating unit. It can be also used as a non-contact sensing unit if necessary. The validity and the performance of the proposed non-contact modal testing method are checked with several experiments.
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ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2012.10.004