Equivalent circuits and parameters for induction-type electromagnetic launchers

J. L. He; E. Levi; Z. Zabar; L. Birenbaum

doi:10.1109/20.195655

Equivalent circuits and parameters for induction-type electromagnetic launchers

J. L. He, E. Levi, Z. Zabar, L. Birenbaum

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

This paper presents a lumped parameter equivalent circuit model for cylindrical, induction-type, electromagnetic coil-launchers based on an electromagnetic field transmission-line approach. Basic closed-form formulas for performance analysis are derived from the model. System parameters and performance indices are obtained from the circuit model and related to the dimensions of the launcher. Currents in the linear array of barrel and projectile (sleeve) conductors are represented by two voltage-controlled current sources. If the barrel and sleeve are approximated by two equivalent cylindrical current sheets, then the circuit model becomes simplified, the Bessel function arguments become real, and the barrel may be modeled by a single constant voltage source. A modified planar model is also considered. Limitations of each level of approximation are presented. Formulas for determining the electrical time constants of the launcher are’ included. Data from experiments with a small model are compared with calculated results.

Original language	English (US)
Pages (from-to)	667-674
Number of pages	8
Journal	IEEE Transactions on Magnetics
Volume	29
Issue number	1
DOIs	https://doi.org/10.1109/20.195655
State	Published - Jan 1993

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.195655

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title = "Equivalent circuits and parameters for induction-type electromagnetic launchers",

abstract = "This paper presents a lumped parameter equivalent circuit model for cylindrical, induction-type, electromagnetic coil-launchers based on an electromagnetic field transmission-line approach. Basic closed-form formulas for performance analysis are derived from the model. System parameters and performance indices are obtained from the circuit model and related to the dimensions of the launcher. Currents in the linear array of barrel and projectile (sleeve) conductors are represented by two voltage-controlled current sources. If the barrel and sleeve are approximated by two equivalent cylindrical current sheets, then the circuit model becomes simplified, the Bessel function arguments become real, and the barrel may be modeled by a single constant voltage source. A modified planar model is also considered. Limitations of each level of approximation are presented. Formulas for determining the electrical time constants of the launcher are{\textquoteright} included. Data from experiments with a small model are compared with calculated results.",

author = "He, {J. L.} and E. Levi and Z. Zabar and L. Birenbaum",

note = "Funding Information: This work was sponsored by US SDIO/IST and managed by US AFOSR under contract F49620-86-C-0126 and by USASDC under contracts DASG60-88-C-0047 and DASG60-91 -C-0154. The authors acknowledge with thanks the suggestion of Prof. Yehuda Naot to perform static force tests at variable frequency.",

year = "1993",

month = jan,

doi = "10.1109/20.195655",

language = "English (US)",

volume = "29",

pages = "667--674",

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publisher = "Institute of Electrical and Electronics Engineers Inc.",

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AU - He, J. L.

AU - Levi, E.

AU - Zabar, Z.

AU - Birenbaum, L.

N1 - Funding Information: This work was sponsored by US SDIO/IST and managed by US AFOSR under contract F49620-86-C-0126 and by USASDC under contracts DASG60-88-C-0047 and DASG60-91 -C-0154. The authors acknowledge with thanks the suggestion of Prof. Yehuda Naot to perform static force tests at variable frequency.

PY - 1993/1

Y1 - 1993/1

N2 - This paper presents a lumped parameter equivalent circuit model for cylindrical, induction-type, electromagnetic coil-launchers based on an electromagnetic field transmission-line approach. Basic closed-form formulas for performance analysis are derived from the model. System parameters and performance indices are obtained from the circuit model and related to the dimensions of the launcher. Currents in the linear array of barrel and projectile (sleeve) conductors are represented by two voltage-controlled current sources. If the barrel and sleeve are approximated by two equivalent cylindrical current sheets, then the circuit model becomes simplified, the Bessel function arguments become real, and the barrel may be modeled by a single constant voltage source. A modified planar model is also considered. Limitations of each level of approximation are presented. Formulas for determining the electrical time constants of the launcher are’ included. Data from experiments with a small model are compared with calculated results.

AB - This paper presents a lumped parameter equivalent circuit model for cylindrical, induction-type, electromagnetic coil-launchers based on an electromagnetic field transmission-line approach. Basic closed-form formulas for performance analysis are derived from the model. System parameters and performance indices are obtained from the circuit model and related to the dimensions of the launcher. Currents in the linear array of barrel and projectile (sleeve) conductors are represented by two voltage-controlled current sources. If the barrel and sleeve are approximated by two equivalent cylindrical current sheets, then the circuit model becomes simplified, the Bessel function arguments become real, and the barrel may be modeled by a single constant voltage source. A modified planar model is also considered. Limitations of each level of approximation are presented. Formulas for determining the electrical time constants of the launcher are’ included. Data from experiments with a small model are compared with calculated results.

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Equivalent circuits and parameters for induction-type electromagnetic launchers

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