A FEM-Based Method Using Harmonic Overtones to Determine the Effective Elastic, Dielectric, and Piezoelectric Parameters of Freely Vibrating Thick Piezoelectric Disks

Jonsson, Ulf G.,1950-Umeå universitet,Centrum för medicinsk teknik och fysik (CMTF) (author)

To gain an understanding of the electroelasticproperties of tactile piezoelectric sensors used in the characterizationof soft tissue, the frequency-dependent electric impedanceresponse of thick piezoelectric disks has been calculatedusing finite element modeling. To fit the calculated to the measuredresponse, a new method was developed using harmonicovertones for tuning of the calculated effective elastic, piezoelectric,and dielectric parameters. To validate the results, theimpedance responses of 10 piezoelectric disks with diameterto-thickness ratios of 20, 6, and 2 have been measured from10 kHz to 5 MHz. A two-dimensional, general purpose finiteelement partial differential equation solver with adaptive meshingcapability run in the frequency-stepped mode, was used.The equations and boundary conditions used by the solver arepresented. Calculated and measured impedance responses arepresented, and resonance frequencies have been compared indetail. The comparison shows excellent agreement, with averagerelative differences in frequency of 0.27%, 0.19%, and0.54% for the samples with diameter-to-thickness ratios of 20,6, and 2, respectively. The method of tuning the effective elastic,piezoelectric, and dielectric parameters is an importantstep toward a finite element model that describes the propertiesof tactile sensors in detail.

Andersson, Britt M.Umeå universitet,Centrum för medicinsk teknik och fysik (CMTF)(Swepub:umu)bran0001 (author)
Lindahl, Olof A.Umeå universitet,Centrum för medicinsk teknik och fysik (CMTF)(Swepub:umu)olli0002 (author)
Umeå universitetCentrum för medicinsk teknik och fysik (CMTF) (creator_code:org_t)

In:IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency ControlNew York : IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society60:1, s. 243-2550885-30101525-8955

By the author/editor: Jonsson, Ulf G., ...; Andersson, Britt ...; Lindahl, Olof A.

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