Název: Computational time reversal method based on finite element method: influence of temperature
Autoři: Mračko, Michal ; Kolman, Radek ; Kober, Jan ; Převorovský, Zdeněk ; Plešek, Jiří
Typ dokumentu: Příspěvky z konference
Konference/Akce: Engineering mechanics 2018 /24./, Svratka (CZ), 20180514
Rok: 2018
Jazyk: eng
Abstrakt: Time reversal method is used to focus elastic waves to the location of the original source and reconstruct its source time function. The procedure consists of two steps: Frontal task and Reversal task. In the Frontal task, the medium is excited by an arbitrary source, elastic waves propagate through a body of interest and the dynamic response at few points on boundary is recorded. In the second step (say the Reversal task) the response signal is reversed in time and transmitted back into the medium resulting in focusing in the original source location. It is of practical importance to investigate a case when the medium changes its properties between the frontal and reversal wave propagation steps. An example is a problem of transferring experimentally recorded data to a computational model, where discrepancies in geometry, elastic properties and boundary conditions are expected. Our motivation is to develop a methodology for computation of time reversal problems in commercial finite element software. The results prove that this method is extremely sensitive to the change of temperature and one have to pay special attention to tuning of elastic parameters relevant to the\nexperiment.
Klíčová slova: elastic wave propagation; finite element method; refocusing; temperature sensitivity; time reversal method
Číslo projektu: EF15_003/0000493, GA17-22615S (CEP)
Poskytovatel projektu: GA MŠk, GA ČR
Zdrojový dokument: Engineering mechanics 2018. Book of full texts, ISBN 978-80-86246-88-8, ISSN 1805-8248

Instituce: Ústav termomechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0290051

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-390087


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Věda a výzkum > AV ČR > Ústav termomechaniky
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