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Content available remote Loss estimation of a reactor with multi conductor coils by 3-D finite element analysis
Sawada M., Shindo Y., Tamiya T., Kawase Y., Yamaguchi T., Katagiri H., Ishigure H.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
110-112
EN
In this paper, the effects of the coil division on copper loss, especially eddy current loss, of a reactor are quantitatively clarified. The eddy current of the coil of the reactor is numerically computed using the three-dimensional finite element method.
PL
W artykule przedstawiono wpływ podziału cewki na straty wiroprądowe w dławiku. Prądy wirowe w cewce dławika obliczane są numerycznie przy użuyciu trójwymiarowej metody elementów skończonych.
2
Content available remote Testing and analysis of high frequency electroelastic characteristics of piezoelectric transformers
Narita F., Shindo Y., Saito F., Mikami M.
Archives of Mechanics
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2007
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Vol. 59, nr 2
119-131
EN
This article presents the results of experimental and numerical work on the dynamic electroelastic response of Rosen-type piezoelectric transformers. Experiments were conducted to measure the electrical impedance, phase angle and voltage gain at various frequencies. The three-dimensional finite element method was also employed to solve the coupled electro-elastic boundary value problem. The electrical impedance, phase angle and voltage gain were calculated and a comparison was made between experiment and simulation. The effects of load resistance and capacitance on the voltage gain and electroelastic field concentrations were also discussed in detail.
3
Content available remote The planar crack problem for a dielectric medium in a uniform electric field
Shindo Y., Narita F.
Archives of Mechanics
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2004
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Vol. 56, nr 6
447-463
EN
The theory for dielectric materials is applied to solve the planar problem of a Griffith crack in an infinite isotropic dielectric body subjected to a far-field tension and a uniform electric field. Fourier transforms are used to reduce the mixed boundary value problem to two simultaneous dual integral equations. The integral equations are then solved exactly, and the stress intensity factor and energy release rate under Mode I and Mode II loadings are expressed in closed form.
4
Content available remote Penny-shaped crack in a piezoceramic cylinder under Mode I loading
Narita F., Lin S., Shindo Y.
Archives of Mechanics
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2003
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Vol. 55, nr 3
275-304
EN
The electroelastic response of a penny-shaped crack in a piezoelectric cylinder of finite radius is investigated in this study. Fourier and Hankel transforms are used to reduce the problem to the solution of a pair of dual integral equations. They are then reduced to a Fredholm integral equation of the second kind. Numerical values of the stress intensity factor, energy release rate and energy density factor for piezoelectric ceramics are obtained to show the influence of applied electrical loads.
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