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Using a look-up table technique and finite element calculations for quick detection of stiff inclusions in silicone rubber
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Centrum för medicinsk teknik och fysik (CMTF).
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Centrum för medicinsk teknik och fysik (CMTF). Umeå universitet, Medicinska fakulteten, Institutionen för strålningsvetenskaper.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för tillämpad fysik och elektronik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Centrum för medicinsk teknik och fysik (CMTF).ORCID-id: 0000-0002-2440-9543
2020 (engelsk)Inngår i: Engineering computations, ISSN 0264-4401, E-ISSN 1758-7077Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
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.

sted, utgiver, år, opplag, sider
Emerald Group Publishing Limited, 2020.
Emneord [en]
Finite Element Method, Look-up table, Fractional derivative model, Lamb waves, Piezoelectric sensor, Silicone rubber
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-168955DOI: 10.1108/EC-02-2019-0036ISI: 000512206600001OAI: oai:DiVA.org:umu-168955DiVA, id: diva2:1420907
Tilgjengelig fra: 2020-04-01 Laget: 2020-04-01 Sist oppdatert: 2020-04-01

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Jonsson, Ulf GLindahl, Olof AAndersson, Britt M.

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