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Using a look-up tab...
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Jonsson, Ulf G.Umeå universitet,Institutionen för tillämpad fysik och elektronik,Centrum för medicinsk teknik och fysik (CMTF)
(författare)
Using a look-up table technique and finite element calculations for quick detection of stiff inclusions in silicone rubber
- Artikel/kapitelEngelska2020
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Emerald Group Publishing Limited,2020
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:umu-168955
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-168955URI
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https://doi.org/10.1108/EC-02-2019-0036DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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Purpose: The aim of the study was to show that a new method, using a look-up table technique, can be used to detect the presence and position of an inclusion embedded in a tissue-like material. Due to the time-consuming nature of the finite element (FE) method or FEM, real-time applications involving FEM as part of a control loop, are traditionally limited to slowly varying systems. By using a simplified two-dimensional FE model and a look-up table, we show by simulations and experiments that it is possible to achieve reasonable computational times in a tactile resonance sensor application.Design/methodology/approach: A piezoelectric disk was placed in the center of a silicone rubber disk (SRD) with viscoelastic properties, where it acted as both sensor and actuator and dissipated radial acoustic waves into the silicone. The look-up table was constructed by calculating the radial Lamb wave transition frequencies in the impedance frequency response of the sensor while varying the position of an inclusion. A position-matching algorithm was developed that matched measured and calculated Lamb wave transitions and thereby identified the presence and position of an inclusion.Findings: In an experiment, the position of a hard inclusion was determined by measuring the Lamb transition frequencies of the first radial resonance in two SRDs. The result of the matching algorithm for Disk 1 was that the matched position was less than 3% from the expected value. For Disk 2, the matching algorithm erroneously reported two false positions before reporting a position that was less than 5% from the expected value. An explanation for this discrepancy is presented. In a verifying experiment, the algorithm identified the condition with no inclusion present.Originality/value: The approach outlined in this work, adds to the prospect of developing time-sensitive diagnostic instruments. This approach has the potential to provide a powerful technique to quickly present spatial information on detected tumors.
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
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Lindahl, Olof A.Umeå universitet,Radiofysik,Centrum för medicinsk teknik och fysik (CMTF)(Swepub:umu)olli0002
(författare)
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Andersson, Britt M.,1962-Umeå universitet,Institutionen för tillämpad fysik och elektronik,Centrum för medicinsk teknik och fysik (CMTF)(Swepub:umu)bran0001
(författare)
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Umeå universitetInstitutionen för tillämpad fysik och elektronik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Engineering computations: Emerald Group Publishing Limited37:6, s. 2137-21530264-44011758-7077
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