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Original title:
Computational time reversal method based on finite element method: influence of temperature
Authors: Mračko, Michal ; Kolman, Radek ; Kober, Jan ; Převorovský, Zdeněk ; Plešek, Jiří
Document type: Papers
Conference/Event: Engineering mechanics 2018 /24./, Svratka (CZ), 20180514
Year: 2018
Language: eng
Abstract: 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.
Keywords: elastic wave propagation; finite element method; refocusing; temperature sensitivity; time reversal method
Project no.: EF15_003/0000493, GA17-22615S (CEP)
Funding provider: GA MŠk, GA ČR
Host item entry: Engineering mechanics 2018. Book of full texts, ISBN 978-80-86246-88-8, ISSN 1805-8248
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0290051
Permalink: http://www.nusl.cz/ntk/nusl-390087
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Mračko, Michal ; Kolman, Radek ; Kober, Jan ; Převorovský, Zdeněk ; Plešek, Jiří
Document type: Papers
Conference/Event: Engineering mechanics 2018 /24./, Svratka (CZ), 20180514
Year: 2018
Language: eng
Abstract: 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.
Keywords: elastic wave propagation; finite element method; refocusing; temperature sensitivity; time reversal method
Project no.: EF15_003/0000493, GA17-22615S (CEP)
Funding provider: GA MŠk, GA ČR
Host item entry: Engineering mechanics 2018. Book of full texts, ISBN 978-80-86246-88-8, ISSN 1805-8248
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0290051
Permalink: http://www.nusl.cz/ntk/nusl-390087
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2018-12-07, last modified 2021-11-24