IEEE Transactions on Magnetics

Issue 1  Part 1 • Jan. 1999

 This issue contains several parts.Go to:  Part 2 

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Displaying Results 1 - 25 of 91
  • Author index

    Publication Year: 1999, Page(s):489 - 490
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  • Preliminary experimental results of a novel induction type railgun

    Publication Year: 1999, Page(s):447 - 451
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    This paper describes the concept of an induction type railgun and the results of preliminary experiments with such a railgun. The induction type railgun may surmount the barrier which has been created by secondary arcs in the operations of plasma armature railguns. The induction type railgun is operated as a conventional railgun during the early stage of acceleration and is designed to accelerate ... View full abstract»

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  • Electro-thermal behavior of solid armatures

    Publication Year: 1999, Page(s):47 - 52
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (512 KB)

    In this paper we discuss the electro-thermal behavior of solid armatures in railguns. This discussion is based on a review of results obtained by a theory that takes into account the three-dimensional nature of melting and vaporizing of the contact surface between rail and armature. This theory is numerically treated by an integral approach based on a suitable decomposition of rails and armature i... View full abstract»

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  • Loss of propulsive force in railguns with laminated containment

    Publication Year: 1999, Page(s):442 - 446
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (604 KB)

    The effect of a close-fitting laminated containment structure on propulsive L' is studied both experimentally and computationally. It is shown that the interaction of axial magnetic fields near the armature with the laminations transfers a fraction of the propulsive force to the containment. This reduces the propulsive L' without causing significant reduction in the rail L'. The effect is very sen... View full abstract»

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  • Effect of railgun electrodynamics on armature discard

    Publication Year: 1999, Page(s):112 - 117
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (684 KB)

    An experiment was conducted to examine the role that electromagnetics plays during the sabot discard process. This investigation is less rigorous than an accuracy test but uses a number of performance indicators, including measured downrange magnetic fields, to quantify the effect on subprojectile performance. The test program consisted of two sets of shots with different armature current profiles... View full abstract»

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  • EML technology research in China

    Publication Year: 1999, Page(s):44 - 46
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (264 KB)

    In the last 20 years, electromagnetic launch (EML) technology has been developed in the US and Europe, and the electromagnetic (EM) launcher has been regarded as a prospective equipment of propulsion. In the early 1980s, experiments on EML technology were done in some Chinese laboratories, and a lot of work has been finished in order to systematize the theory of EML technology in some universities... View full abstract»

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  • Performance simulation of pulsed power supply system for electrothermal launcher

    Publication Year: 1999, Page(s):328 - 333
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (756 KB)

    Computer simulation of electrical discharges in the high-pressure chambers of electrothermal launcher pulsed power supply systems containing homopolar generators (HPGs), storage inductors (SIs) and two-stage opening switches with mechanical and explosive circuit breakers has been carried out at the chamber radii of (0.02-0.1) m and various values of the gap spacing (0.1-0.8) m. Space-time dependen... View full abstract»

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  • Experimental observation of the rail resistance contribution to muzzle voltage [in railguns]

    Publication Year: 1999, Page(s):437 - 441
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (572 KB)

    In 1994, Dreizin and Barber presented an analysis of the muzzle voltage developed in a railgun with a solid contact armature. They showed that there is a significant contribution to the measured muzzle voltage arising from the current flow in the rails ahead of the armature. They further argued that this voltage is influenced by velocity skin effect and that it may become the dominant effect on mu... View full abstract»

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  • First measurements of current distribution in moving fiber-armatures in railguns

    Publication Year: 1999, Page(s):107 - 111
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (852 KB)

    Using miniaturized Rogowski coils developed at ISL, we are able to measure the currents flowing through moving metallic fiber-armatures in a railgun. The 15 mm square bore railgun is 0.5 m in length and is powered by a 150 kJ capacitor bank. The peak current is about 200 kA and typical launch velocities with this test bed reach 600 m/s. The armature consists of two fiber brushes made of the same m... View full abstract»

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  • Electric launch in Russia. A review of recent results

    Publication Year: 1999, Page(s):37 - 43
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (848 KB)

    In this paper, we present some major research results in electric launch technology that have been obtained in Russia since 1996. The research program includes studies of the potential of railguns, electric discharge launchers, coil guns, and ETC guns. The main efforts of researchers are now focused on investigation of fundamental physical processes and phenomena that limit attainment of high velo... View full abstract»

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  • EM gun scaling relationships

    Publication Year: 1999, Page(s):484 - 488
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (348 KB)

    Sub-scale system test results and the experiences gained during fabrication and testing can be extremely valuable for success with the full scale system. This publication focuses on the EM gun scaling relationships between the full and sub-scaled systems' field variables. Derivations of the scaling relationships presented are based upon the magnetic, thermal and momentum differential equations and... View full abstract»

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  • Influence of radiation on grain heating in ETC closed chambers

    Publication Year: 1999, Page(s):234 - 239
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (708 KB)

    A model of radiation from an ETC plasma is proposed to investigate bulk heating of the propellant. The radiant energy is transmitted to the solid propellant, the combustion chamber gases, and the chamber walls. A numerical simulation is used to compute the enhancement in the burning rate of the solid propellant as a result of the bulk temperature increase. The model is applied to a closed chamber ... View full abstract»

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  • High-current vacuum switching devices for power energy storages

    Publication Year: 1999, Page(s):323 - 327
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    The series of new vacuum switching devices for the commutation of power energy storage has been developed. To provide reliable and fast commutation of capacitor type energy storages a new type of triggered vacuum switch (TVS) of sealed off design has been developed-the RVU-43. This switch provides commutation of current pulses with peak value up to 250 kA at working voltage up to 25 kV, with trans... View full abstract»

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  • Ablation measurements on EML insulators using free-arcs

    Publication Year: 1999, Page(s):294 - 299
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (432 KB)

    A new technique has been used to determine the ablation threshold and ablation rate of EML materials. Analysis of experimental data obtained by measuring free-arc velocity as a function of rail current in the presence of a background gas has been performed. A simulation of the free-arc motion has been developed using the graphical programming capabilities of LabVIEW. Nonablating theoretical data h... View full abstract»

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  • Investigations on magnetic field in the interface regions between plasma armature and rail electrodes in a railgun

    Publication Year: 1999, Page(s):65 - 67
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (412 KB)

    The key to controlling rail ablation lies in the interface regions between plasma armature and rails. The distribution of plasma in this region is affected by many factors, the magnetic field being the dominant one. In this paper, we analyze the magnetic field generated by rails and plasma armature in the interface regions, study the pattern and distribution of plasma near the interface and show t... View full abstract»

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  • Single shot switch performance on the cannon caliber electromagnetic gun program

    Publication Year: 1999, Page(s):346 - 351
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    The Cannon Caliber Electromagnetic Gun (CCEMG) program at The University of Texas at Austin Center for Electromechanics incorporates two solid state switch modules. The 95 MW rectifier/inverter bridge (RIB) generates the field inside of the compulsator (CPA) and the 825 kA gun switch module (GSM) is the main closing switch between the CPA and the launcher. Since commissioning the CCEMG system, nea... View full abstract»

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  • The STAR railgun concept

    Publication Year: 1999, Page(s):432 - 436
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    A novel concept for a staged augmented railgun is evaluated in which an external augmenting field would be applied to the bore of the railgun in addition to the self-induced magnetic field resulting from the current flow in the main rails. The augmenting magnetic field would be provided by multiple saddle-shaped coils located on the exterior of the gun barrel. These magnet coils, which would opera... View full abstract»

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  • Electromagnetic powder deposition experiments

    Publication Year: 1999, Page(s):268 - 273
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (848 KB)

    The US Department of Defense (DoD) and commercial entities are dependent on chemical plating and coating processes to replace worn or eroded material on damaged parts. Logistics Centers have been forced to consider replacement materials for repair operations due to the tightening of government regulations on the use of toxic and hazardous materials. This paper describes a new process capable of fu... View full abstract»

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  • Electrical and thermal effects of rail cladding

    Publication Year: 1999, Page(s):417 - 422
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (568 KB)

    Achieving long rail life may require the use of a thin surface cladding of hard, refractory material. This paper reports numerical simulations of the effect of a resistive cladding on railgun efficiency. Simulations are performed using a three-dimensional (3-D) finite element code, Electro-Mechanical Analyses Program in 3 Dimensions (EMAP3D), that is capable of tracking moving conductors. Current ... View full abstract»

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  • A 540 kJ modular capacitive pulsed power supply system for basic investigations on ETC-performance

    Publication Year: 1999, Page(s):394 - 397
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (800 KB)

    The investigations of the electrothermal control of the combustion of solid propellants to be applied in electrothermochemical (ETC) guns requires pulsed power supply systems which provide a high flexibility in pulse shape adjustment. In order to support the ETC gun investigations to be performed within the German ETC-programme at TZN a modular capacitive pulsed power supply system was designed, s... View full abstract»

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  • Experiments to measure wear in aluminum armatures [in railguns]

    Publication Year: 1999, Page(s):100 - 106
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1016 KB)

    Although wear in sliding electric contacts has been studied extensively at low velocities (100 m/s or less), the phenomenon constitutes uncharted territory at conditions of interest in railguns. A fundamental understanding of wear in railguns is important because loss of material from the armature is one cause of transition from solid to arcing contact, and the resulting deleterious effects on per... View full abstract»

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  • ETC technology development at Soreq NRC, Israel

    Publication Year: 1999, Page(s):31 - 36
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (624 KB)

    About ten years ago Soreq NRC, Israel initiated the development of SPETC (solid propellant electro thermal chemical) technology. The program started with the The BMDO (previously SDIO), the US Army SDC, ARL (US Army Research Laboratory), the German government and the Israeli Ministry of Defense (IMOD). The goals of the program were to obtain a high muzzle energy for ATBM (anti tactical ballistic m... View full abstract»

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  • Integrated thermal management of a hybrid electric vehicle

    Publication Year: 1999, Page(s):479 - 483
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (576 KB)

    A thermal management methodology, based on the Vehicle Integrated Thermal Management Analysis Code (VITMAC), has been developed for a notional vehicle employing the all-electric combat vehicle (AECV) concept. AECV uses a prime power source, such as a diesel, to provide mechanical energy which is converted to electrical energy and stored in a central energy storage system consisting of flywheels, b... View full abstract»

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  • Theoretical analysis of an external pulsed plasma jet

    Publication Year: 1999, Page(s):228 - 233
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    A theoretical description for a highly underexpanded, supersonic, pulsed plasma jet is presented, using an approximate analytical model. The model assumes an inviscid formulation and introduces an ad hoc asymptotic matching procedure with a perfect gas approximation. However, the specific heat ratio is allowed to be pressure and temperature dependent and the gas constant is a function of the degre... View full abstract»

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  • Energy storage capabilities of rotating machines including a comparison of laminated disk and rim rotor composite designs

    Publication Year: 1999, Page(s):317 - 322
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (540 KB)

    High speed rotating machines are being employed as energy storage devices to provide both pulsed and load leveling power to future electric weapon and/or electric drive vehicle systems. The ability to store as much energy as possible for the least weight is of paramount importance to these systems. The rotor configurations employed in these machines can vary greatly in shape, physical properties a... View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics is a peer-reviewed, archival journal in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The journal publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology