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Cross-correlation technique for revealing defects in pulsed eddy current defectoscopy

100%

Jansa J. , Slobodnik K. , Karban P. , Dolezel I.

tom No. 77

47--53

Important aspects of the cross-correlation in the pulsed eddy current defectoscopy are analyzed and discussed. The application of the technique is described and illustrated with an example of an artificial defect in an electrically conductive steel plate. The results of the measurements are compared with the data obtained for the reference defect.

Numerical modeling of transient acoustic field using finite element method

100%

Koudela L. , Jansa J. , Karban P.

2013

tom No. 73

155--160

Numerical solution of acoustic wave equation in the time domain is performed. The appropriate mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of a semicircular acoustic diffuser in a free field, realized by a fully adaptive higher-order finite element method implemented in our own codes Agros2D and Hermes. The results are compared with the data obtained by the commercial code Comsol Multiphysics.

Numerical modeling of Gauss monocycle pulse in transient acoustic field

100%

Koudela L. , Jansa J. , Karban P.

Computer Applications in Electrical Engineering

2013

tom Vol. 11

141--147

Numerical solution of acoustic wave equation in the time domain is performed. The mathematical model is described by the partial differential wave equation supplemented with appropriate boundary conditions. The goal is to obtain the time evolution of the distribution of acoustic pressure, which can serve as the basis for the solution of various subsequent problems. The paper discusses the results of the numerical analysis of the Gauss monocycle pulse that proceeds from the signal source and incident on the semi-circular acoustic diffuser in a free field, realized by a fully adaptive higherorder finite element method implemented in codes Agros2D and Hermes developed by the hp-FEM group. Selected results of the computations are compared with the data obtained by the commercial code COMSOL Multiphysics.

Electrostatic microactuators for precise positioning and comparison of their parameters

88%

Štarman V. , Kacerovský J. , Jansa J. , Karban P. , Doležel I.

Computer Applications in Electrical Engineering

2013

tom Vol. 11

122--127

Comparison of several types of electrostatic microactuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated with typical examples whose results are discussed.

Comparison of efficiency of electrostatic micro-actuators for precise positioning

88%

Štarman V. , Kacerovský J. , Jansa J. , Karban P. , Doležel I.

2013

tom No. 73

29--34

Comparison of several types of electrostatic micro-actuators is carried out, particularly with respect to their resultant force effects. The continuous mathematical model of such actuators is mostly described by the Laplace equation. In this paper, its numerical solution is performed by a fully adaptive higher-order finite element method, using a code developed by the authors. The methodology is illustrated by typical examples whose results are discussed.