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IEE Proceedings A - Physical Science, Measurement and Instrumentation, Management and Education - Reviews

Issue 7 • Sept. 1988

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Displaying Results 1 - 17 of 17
  • Complementary solutions of linear and nonlinear magnetostatic problems

    Publication Year: 1988, Page(s):433 - 447
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1572 KB)

    Complementary magnetostatic formulations and the associated bounds are derived systematically from an error based on the mismatch in the constitutive relationship. Two-dimensional finite-element results are presented for linear and nonlinear problems. Combined presentation of complementary computational results is shown to yield significant information on their comparative numerical behaviour, the... View full abstract»

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  • Static fringing capacitance of a dielectric loaded coaxial termination

    Publication Year: 1988, Page(s):448 - 450
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (271 KB)

    The problem of theoretically determining the electrostatic fringing capacitance of a coaxial line which is terminated in an infinite, dielectric loaded ground plane has been reexamined. It is shown that the dependence of the fringing capacitance on the permittivity of the load is essentially nonlinear and may be modelled using a power series which arises naturally from the supporting mathematical ... View full abstract»

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  • Electromagnetic shielding in a system of two slabs

    Publication Year: 1988, Page(s):451 - 456
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (413 KB)

    An attempt is made at the examination of the shielding effectiveness of a system of two conducting slabs, when the excitation is a current filament placed above the system of the slabs. For the determination of the electromagnetic field the Helmholtz equation is used. The term of displacement current is not omitted as is usually the case. The problem is solved under steady-state conditions. The so... View full abstract»

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  • Integral formulation for 3D eddy-current computation using edge elements

    Publication Year: 1988, Page(s):457 - 462
    Cited by:  Papers (70)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (575 KB)

    An integral formulation for eddy-current problems in nonmagnetic structures is presented. The solenoidality of the current density is assured by introducing a current vector potential T. This potential possesses only two scalar components, as the gauge chosen to ensure its uniqueness is T.u=0, where u is a prescribed vector field. The discrete analogue of this gauge and the boundary conditions are... View full abstract»

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  • Foucault currents in a conducting sphere moving with constant velocity

    Publication Year: 1988, Page(s):463 - 469
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (515 KB)

    The difficult problem of evaluating motionally induced currents is solved for a small sphere moving in the field of a magnetic dipole. Numerical results are given for the induced currents, the induced magnetic dipole and the magnetic force. The results obtained for this canonical case are valuable for a better understanding of the physical phenomena involved.<> View full abstract»

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  • Calculation of self and mutual impedances for coils on ferromagnetic cores

    Publication Year: 1988, Page(s):470 - 476
    Cited by:  Papers (26)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (574 KB)

    By means of integral transform techniques, the paper establishes a new set of self- and mutual-impedance formulas relating to coils on ferromagnetic cores of circular cross-section. If the core is straight and infinitely long, the formulas are expressed in terms of convergent integrals that may be evaluated numerically. In the case of closed cores, e.g. toroidal cores, the formulas formally reduce... View full abstract»

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  • Digital-pulse approach to electromagnetism

    Publication Year: 1988, Page(s):477 - 486
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1095 KB)

    The advantages of a change in approach to electromagnetism are explored. In place of the historical method, which bases magnetism on empirical observations and deduces propagation effects, the sequence is reversed by assuming a finite velocity of propagation and deriving the magnetic interactions. The starting point is the pulse, and the key relationship is the change in charge density which is ca... View full abstract»

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  • Active network for correcting impulse-voltage measurements

    Publication Year: 1988, Page(s):487 - 492
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (499 KB)

    High-voltage impulse measurements are usually carried out by using a divider system which may distort the impulse. The authors present a method for the correction of the input signal from the distorted output signal by using a wideband active network. The method is demonstrated by several test results. The accuracy analysis of the method is also carried out theoretically. The correction method is ... View full abstract»

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  • Complementary solutions of linear and nonlinear magnetostatic problems

    Publication Year: 1988, Page(s):433 - 447
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2358 KB)

    Complementary magnetostatic formulations and the associated bounds are derived systematically from an error based on the mismatch in the constitutive relationship. Two-dimensional finite-element results are presented for linear and nonlinear problems. Combined presentation of complementary computational results is shown to yield significant information on their comparative numerical behaviour, the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Erratum: Impulse flashover along the outer surface of a cylindrical dielectric solid with a gas layer inside

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (80 KB)
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  • Static fringing capacitance of a dielectric loaded coaxial termination

    Publication Year: 1988, Page(s):448 - 450
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (335 KB)

    The problem of theoretically determining the electrostatic fringing capacitance of a coaxial line which is terminated in an infinite, dielectric loaded ground plane has been reexamined. It is shown that the dependence of the fringing capacitance on the permittivity of the load is essentially nonlinear and may be modelled using a power series which arises naturally from the supporting mathematical ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Electromagnetic shielding in a system of two slabs

    Publication Year: 1988, Page(s):451 - 456
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (510 KB)

    In the paper, an attempt is made at the examination of the shielding effectiveness of a system of two conducting slabs, when the excitation is a current filament placed above the system of the slabs. For the determination of the electromagnetic field the Helmholtz equation is used. The term of displacement current is not omitted as is usually the case. The problem is solved under steady-state cond... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integral formulation for 3D eddy-current computation using edge elements

    Publication Year: 1988, Page(s):457 - 462
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (721 KB)

    An integral formulation for eddy-current problems in nomagnetic structures is presented. The solenoidality of the current density is assured by introducing a current vector potential T. This potential possesses only two scalar components, as the gauge chosen to ensure its uniqueness is T. u = 0, where u is a prescribed vector field. The discrete analogue of this gauge and the boundary conditions a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Foucault currents in a conducting sphere moving with constant velocity

    Publication Year: 1988, Page(s):463 - 469
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (641 KB)

    The difficult problem of evaluating motionally induced currents is solved for a small sphere moving in the field of a magnetic dipole. Numerical results are given for the induced currents, the induced magnetic dipole and the magnetic force. The results obtained for this canonical case are valuable for a better understanding of the physical phenomena involved. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Calculation of self and mutual impedances for coils on ferromagnetic cores

    Publication Year: 1988, Page(s):470 - 476
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (715 KB)

    By means of integral transform techniques, the paper establishes a new set of self- and mutual-impedance formulas relating to coils on ferromagnetic cores of circular cross-section. If the core is straight and infinitely long, the formulas are expressed in terms of convergent integrals that may be evaluated numerically. In the case of closed cores, e.g. toroidal cores, the formulas formally reduce... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital-pulse approach to electromagnetism

    Publication Year: 1988, Page(s):477 - 486
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1373 KB)

    The advantages of a change in approach to electromagnetism are explored. In place of the historical method, which bases magnetism on empirical observations and deduces propagation effects, the sequence is reversed by assuming a finite velocity of propagation and deriving the magnetic interactions. The starting point is the pulse, and the key relationship is the change in charge density which it ca... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Active network for correcting impulse-voltage measurements

    Publication Year: 1988, Page(s):487 - 492
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (735 KB)

    High-voltage impulse measurements are usually carried out by using a divider system which may distort the impulse. The paper presents a method for the correction of the input signal from the distorted output signal by using a wide-band active network. The method is demonstrated by several test results. The accuracy analysis of the method is also carried out theoretically. The correction method is ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.