Simulation of materials and joints in FDTD using digital filter macro-models

TY - CHAP

T1 - Simulation of materials and joints in FDTD using digital filter macro-models

AU - Flintoft, Ian David

AU - Dawson, John Frederick

AU - Xia, Ran

AU - Porter, Stuart John

AU - Marvin, Andy

PY - 2012/7/2

Y1 - 2012/7/2

N2 - A methodology for the accurate and efficient modelling of thin surfaces, containing either frequency-dependent homogeneous materials or heterogeneous pseudo two-dimensional joints, in time-domain computer codes is presented. The approach is based on a two-sided surface impedance boundary condition “macro-model” representation of the material or joint. The macro-model is derived from scattering matrix data obtained from either measurements or high resolution simulations that is processed using conditioning and optimization algorithms to produce a digital filter representation of the impedance matrix elements. The digital filters are realized in a finite-difference time-domain code as a second-order section cascade filter using a novel face-centred explicit update scheme.

AB - A methodology for the accurate and efficient modelling of thin surfaces, containing either frequency-dependent homogeneous materials or heterogeneous pseudo two-dimensional joints, in time-domain computer codes is presented. The approach is based on a two-sided surface impedance boundary condition “macro-model” representation of the material or joint. The macro-model is derived from scattering matrix data obtained from either measurements or high resolution simulations that is processed using conditioning and optimization algorithms to produce a digital filter representation of the impedance matrix elements. The digital filters are realized in a finite-difference time-domain code as a second-order section cascade filter using a novel face-centred explicit update scheme.

M3 - Other chapter contribution

BT - EuroEM 2012

ER -