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Using a look-up table technique and finite element calculations for quick detection of stiff inclusions in silicone rubber
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF).
Umeå University, Faculty of Medicine, Department of Radiation Sciences, Radiation Physics. Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF).
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Umeå University, Faculty of Science and Technology, Centre for Biomedical Engineering and Physics (CMTF).ORCID iD: 0000-0002-2440-9543
2020 (English)In: Engineering computations, ISSN 0264-4401, E-ISSN 1758-7077, Vol. 37, no 6, p. 2137-2153Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Emerald Group Publishing Limited, 2020. Vol. 37, no 6, p. 2137-2153
Keywords [en]
Finite Element Method, Look-up table, Fractional derivative model, Lamb waves, Piezoelectric sensor, Silicone rubber
National Category
Computer Sciences Electrical Engineering, Electronic Engineering, Information Engineering Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-168955DOI: 10.1108/EC-02-2019-0036ISI: 000512206600001Scopus ID: 2-s2.0-85079439504OAI: oai:DiVA.org:umu-168955DiVA, id: diva2:1420907
Funder
European CommissionAvailable from: 2020-04-01 Created: 2020-04-01 Last updated: 2022-04-04Bibliographically approved

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Jonsson, Ulf G.Lindahl, Olof A.Andersson, Britt M.

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