Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents This paper presents a semi-analytical method for the calculation of the electromagnetic field due to a three-dimensional incident field which is screened by an infinitely long circular cylindrical conducting and permeable shell. The resulting threedimensional Helmholtz equations are solved by using the method of the separation of variables together with the Fourier Transform applied to the longitudinal field components. The transformed transversal components are represented in terms of the transformed longitudinal components. With the aid of the DFT (discrete Fourier Transform) the three-dimensional incident field can be expanded into a Fourier series and then be transformed. Finally the inverse DFT yields the solution of the boundary value problem. Calculations using the proposed method are presented.
    Notes: Übersicht Ein semianalytisches Rechenverfahren wird vorgestellt, welches es gestattet, das elektromagnetische Feld eines durch eine unendlich lange, kreiszylindrische, leitfähige und permeable Hülle geschirmten, dreidimensionalen Erregerfeldes zu berechnen. Die dabei auftretenden dreidimensionalen Helmholtz-Gleichungen werden unter Verwendung der longitudinalen Feldkomponenten mit Hilfe der Methode der Separation der Variablen und der Fourier-Transformation gelöst. Die transformierten transversalen Komponenten werden in Abhängigkeit der transformierten longitudinalen Komponenten dargestellt. Unter Zuhilfenahme der DFT (diskrete Fourier-Transformation) wird das dreidimensionale Erregerfeld erst in eine Fourierreihe entwickelt und dann ebenfalls transformiert. Eine abschließende inverse DFT liefert die Lösung des Randwertproblems. Unter Anwendung des vorgeschlagenen Verfahrens werden Rechenergebnisse präsentiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 75 (1992), S. 249-253 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents This work presents a semi-analytical method for calculating the eddy currents due to a three-dimensional incident field which is caused by a line current situated in the cavity of a finitely long circular cylindrical conducting and permeable shell. The components of the incident field are expanded into Fourier series in the azimuthal and the axial directions. The Fourier coefficients of the transversal field components are expressed in terms of the Fourier coefficients of the longitudinal field components, because only the longitudinal field components allow using the method of separation of variables for solving the occurring Helmholtz equations.
    Notes: Übersicht In der vorliegenden Abhandlung wird ein semianalytisches Verfahren zur Berechnung der dreidimensionalen Wirbelströmung in einer leitfähigen und permeablen kreiszylindrischen Hülle bei Vorhandensein eines dreidimensionalen Erregerfeldes beschrieben, das durch einen innerhalb des Zylinderhohlraumes fließenden Linienstrom hervorgerufen wird. Die Komponenten des Erregerfeldes werden in azimutaler und axialer Richtung in eine Fourier-Reihe entwickelt. Die Fourier-Koeffizienten der (bezüglich der Zylinderachse) transversalen Feldkomponenten werden in Abhängigkeit von den Fourier-Koeffizienten der longitudinalen Feldkomponenten dargestellt, da nur die longitudinalen Feldkomponenten eine Separation der Variablen in den auftretenden Helmholtz-Gleichungen zulassen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 76 (1993), S. 423-426 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Übersicht Die Verteilungen von Potential, Stromdichte und Verlustleistungsdichte in einem kreisförmigen, dünnen Film- bzw. Folienwiderstand werden mittels einer konformen Abbildung berechnet. Das Ergebnis zeigt, daß die Verlustleistungsdichte in der Ecke des Kontakts zwischen der Zuleitung und dem Film (der Folien) des Widerstandes gegen unendlich strebt. Dadurch kann dieser Teil des Widerstandes abbrennen oder schmelzen. Abschließend wird eine geeignete Kontaktform zwischen der Zuleitung und dem Widerstand vorgeschlagen.
    Notes: Contents The potential, current flux and dissipation density distributions in a circular thin film/foil resistor are calculated based on a conformal mapping. The results indicate that the dissipation density at the corner of the contact between the lead and the resistor film/foil reaches infinity. This results in burning down or melting that part of the resistor. Finally, a reasonable contact shape between the lead and the resistor is suggested.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 79 (1996), S. 289-295 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Contents Both a 3-D semi-analytical method and an approach based on a 3-D FEM are presented to calculate the electromagnetic and thermal fields for edge induction heating. The proposed semi-analytical method is based on the separation of variables and the discrete Fourier transform to solve the eddy current problem. The Fourier components are sinusoidal functions with complex arguments. Boundary conditions are used to determine the unknown coefficients, and a criterion for the existence of the solution is given. The thermal problem is solved by a nonlinear FEM by considering the radiation boundary condition. The computation results show that after the edge induction heating the temperature at the edges of the steel bar is really raised as expected to compensate the temperature drop at the edges during the steel strip casting process. Compared with experimental model records, the proposed algorithms are verified. Comparisons performed include the distribution of temperature and four main characteristic quantities of the edge induction heating. The error observed is less than 15%. Because the computation shows the distributions of the power and fields in the heated bar, it can be expected to achieve an optimal design for the edge induction heating.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 186 (1994), S. 265-268 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 352 (1988), S. 61-66 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Organometallic Chemistry 352 (1988), S. 67-72 
    ISSN: 0022-328X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Peptides 14 (1993), S. 1159-1164 
    ISSN: 0196-9781
    Keywords: 5-HT"1"C receptor ; 6-Hydroxydopamine ; D"1 receptor ; MIF-1 ; Oral activity ; SKF 38393 ; Supersensitivity ; m-Chlorophenylpiperazine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 74 (1993), S. 186-190 
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 62 (1992), S. 410-415 
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...