2008 14th Symposium on Electromagnetic Launch Technology最新文献_第8页

Advances in Electromagnetic Launch Science and Technology and its Applications 电磁发射科学技术及其应用进展

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.9

H. Fair

{"title":"Advances in Electromagnetic Launch Science and Technology and its Applications","authors":"H. Fair","doi":"10.1109/elt.2008.9","DOIUrl":"https://doi.org/10.1109/elt.2008.9","url":null,"abstract":"The US continues a broad spectrum of research to provide the scientific underpinnings for electromagnetic launch. These efforts include fundamental research on materials, properties of materials subjected to electromagnetic and thermal stress, railguns (particularly the rail-armature sliding interface), coilguns and energy storage and power conditioning. There is also broad and growing interest in novel applications of electromagnetic launch. For example, a supersonic beam of neon atoms have been slowed and stopped opening the door to investigating the atomic and molecular properties of most of the periodic table of atoms and certain molecules. Research is continuing on magnetic brakes, and the more traditional research on the launch of materials to hypervelocities. More recently, the launching of materials into earth's orbit or even deeper in space is obtaining renewed interest. Consequently, some attention is being given to the types of materials of projectiles for hypersonic flight. The US Navy has initiated new multidisciplinary University Research teams including physics, chemistry, and materials science to develop new diagnostic tools and to provide a more detailed examination of the rail-armature interface. Most significantly, the US Army has elevated its emphasis from electromagnetic launch science and technology development to the operational consequences of long-range precision fires. In concert with the recent US Navy efforts on long-range fires, it is anticipated that the pull of these applications will enable even greater advances in the science and technology of electromagnetic launch.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114059756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integral Formulation of the Problem of Current Distribution in Compulsator Wires of Electromagnetic Launchers and Railguns 电磁发射器和轨道炮强制导线电流分布问题的积分公式

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.105

K. Sheshadri

引用次数: 0

Thermal Stresses Analysis of the Rails and the Armature of an Electromagnetic Launcher 电磁发射器导轨和电枢的热应力分析

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.92

M. Ghassemi, M. Varmazyar

{"title":"Thermal Stresses Analysis of the Rails and the Armature of an Electromagnetic Launcher","authors":"M. Ghassemi, M. Varmazyar","doi":"10.1109/elt.2008.92","DOIUrl":"https://doi.org/10.1109/elt.2008.92","url":null,"abstract":"In an electromagnetic launcher, the magnetic field creates a dynamic force that moves the armature forward. During the launch, electrical current creates high body forces and temperature distribution in the rails and the armature. As a result the rails and armature experience high amplitude stress and strain which damage the rails and the armature and reduces their life span. The purpose of this paper is to investigate the effect of body force as well as the temperature distribution on the displacement of the rails in an electromagnetic launcher. In this study the physical and geometrical properties of the rails are constant in location. In our formulation of governing non-linear differential equations, Maxwell, Energy equation and Navier equation are applied to the rails under dynamic loading. To solve the non-linear governing differential equations a finite difference base code is developed and utilized. It is shown that the Maximum volumetric forces take place where the highest magnetic field gradient occurs. In addition, the maximum magnetic force is accumulated at the trailing edge of the armature and portions of the rail interior. The thermal stresses distribution follows the same trend as displacement due to temperature behavior of the rails.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117251467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

50 kJ Ultra-Compact Pulsed-Power Supply Unit for Active Protection Launcher Systems 50kj超紧凑型脉冲电源单元，用于主动保护发射系统

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.13

E. Spahn, K. Sterzelmeier, C. Gauthier-Blum, V. Brommer, L. Sinniger, B. Grasser

{"title":"50 kJ Ultra-Compact Pulsed-Power Supply Unit for Active Protection Launcher Systems","authors":"E. Spahn, K. Sterzelmeier, C. Gauthier-Blum, V. Brommer, L. Sinniger, B. Grasser","doi":"10.1109/elt.2008.13","DOIUrl":"https://doi.org/10.1109/elt.2008.13","url":null,"abstract":"The impulsive acceleration of active protection elements such as armour plates or other terminal ballistics interception devices can preferably be realized by single-stage electromagnetic launcher systems using pancake coils. The technology with controlled multipartite coil assemblies represents a new supplementary topic in the entire field of ballistics. But the essential condition is the availability of modular high energy density pulsed power supply units with low volume and weight. During the last years modular structured energy packs have been built up at ISL as a basic installation for various applications in the field of pulsed power electronics, in particular they are developed to feed active protection launcher systems. Each power supply module comprises one energy storage capacitor, a thyristor stack, a corresponding number of crow-bar diodes and a well-designed coaxial power line serving as a pulse forming network and current limiting reactor. To provide high flexibility these modules can be triggered separately and independently by fiber optic transmitters with an overall jitter lower than 50 ns. The paper presented describes the basic design of a 50 kJ energy pack and the further developed set-up with a strongly reduced overall height obtained by using a novel multichip thyristor. Additionally a two dimensional steerable launcher system supplied by these modules will be presented.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"165 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114100235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Two-Objective Optimization Design for Pulsed Power Supply 脉冲电源的双目标优化设计

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.94

Zhengjun Shi, Xinjie Yu

引用次数: 0

A Study of Electrothermal Launcher Efficiencies and Gas Dynamics 电热发射效率与气体动力学研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.114

D. Motes, J. Ellzey, S. Levinson, J. Parker, F. Stefani, D. Wetz

引用次数: 6

The Use of Electronic Components in Railgun Projectiles 电子元件在轨道炮弹丸中的应用

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.124

R. Ciolini, M. Schneider, B. Tellini

{"title":"The Use of Electronic Components in Railgun Projectiles","authors":"R. Ciolini, M. Schneider, B. Tellini","doi":"10.1109/elt.2008.124","DOIUrl":"https://doi.org/10.1109/elt.2008.124","url":null,"abstract":"This paper deals with experiments and calculations performed in order to investigate the influence of the electromagnetic hardening of payloads in a railgun. This is a complex task: besides the large amplitudes of the in-bore magnetic fields due to the pulsed current, the exit of the projectile from the muzzle and the consequences of plasma arcs have to be considered. At the muzzle the magnetic induction can drop from several Teslas to zero within some microseconds, leading to very high induced voltages and electric fields in the metallic parts of the projectile. On the other hand, the electric contact established by solid armatures tends to develop into electric arcs at high velocities during the launch. These plasma arcs as well as the closing switch transients of the railgun circuit are a source of electromagnetic radiation in a broad spectral range. Some electronic devices were selected and tested with static setups corresponding to the previous conditions. In a first phase a series of static railgun experiments (no projectile movement) was performed. In a second phase, static experiments simulating the muzzle exit conditions were carried out. Finally, the influence of electromagnetic waves emitted during railgun experiments on electronic devices was investigated, using a static setup with a conventional spark gap.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126015356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Melting and Cavity Growth in the Vicinity of Crack Tips Subjected to Short-Duration Current Pulses 短时间电流脉冲作用下裂纹尖端附近的熔化和空洞生长

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.121

F. Gallo, S. Satapathy, K. Ravi-Chandar

引用次数: 8

Effect of Magnetic Flux Density and Other Properties on Temperature and Velocity Distribution in Magnetohydrodynamic Pump (MHD) 磁通密度及其它特性对磁流体动力泵(MHD)内温度和速度分布的影响

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.32

M. Ghassemi, A. Shahidian

{"title":"Effect of Magnetic Flux Density and Other Properties on Temperature and Velocity Distribution in Magnetohydrodynamic Pump (MHD)","authors":"M. Ghassemi, A. Shahidian","doi":"10.1109/elt.2008.32","DOIUrl":"https://doi.org/10.1109/elt.2008.32","url":null,"abstract":"The interaction of moving conducting fluids with electric and magnetic fields provides the magnetohydrodynamic (MHD) phenomenon. Based on this principle, MHD pump uses the \"Lorentz force\" to move fluid. The railgun channel is one important segment in an electromagnetic launcher. As known one of the possible ways to increase the EML efficiency is to segment the working channel. For this purpose MHD flow study is necessary. It is required to have the knowledge of the flow field and the temperature to design a magnetohydrodynamic pump. The purpose of this study is to investigate the effect of the magnetic flux density and current on the flow and the temperature distribution in a magnetohydrodynamic pump. To solve the governing differential equations, a finite difference based code is developed and utilized. The temperature and velocity are calculated by solving the energy and the Navier-Stokes equations. Results show a maximum value of velocity for different values of magnetic flux density (B). However the temperature stays almost constant with magnetic field. In addition as current increases, the velocity and the temperature increase too.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131202447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Inductive Pulsed-Power Supply with Marx Generator Methodology 马克思发电机方法的感应脉冲电源

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.50

Y. Aso, T. Hashimoto, T. Abe, S. Yamada

引用次数: 5