000022823 001__ 22823
000022823 005__ 20220110134529.0
000022823 04107 $$aeng
000022823 046__ $$k2018-05-14
000022823 100__ $$aMračko, M.
000022823 24500 $$aComputational time reversal method based on finite element method: influence of temperature

000022823 24630 $$n24.$$pEngineering Mechanics 2018
000022823 260__ $$bInstitute of Theoretical and Applied Mechanics of the Cech Academy of Sciences, Prague
000022823 506__ $$arestricted
000022823 520__ $$2eng$$aTime 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 experiment.

000022823 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022823 653__ $$atime reversal method, elastic wave propagation, finite element method, temperature sensitivity, refocusing

000022823 7112_ $$aEngineering Mechanics 2018$$cSvratka, CZ$$d2018-05-14 / 2018-05-17$$gEM2018
000022823 720__ $$aMračko, M.$$iet, al.
000022823 8560_ $$ffischerc@itam.cas.cz
000022823 8564_ $$s758626$$uhttps://invenio.itam.cas.cz/record/22823/files/561.pdf$$yOriginal version of the author's contribution in proceedings, page , section DYN.
000022823 962__ $$r21225
000022823 980__ $$aPAPER