2008 14th Symposium on Electromagnetic Launch Technology最新文献_第3页

Simulation of the Eddy Current Effects on the Inductance Gradient of Railgun 涡流对轨道炮电感梯度影响的仿真研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.123

W. Yuan, P. Yan

{"title":"Simulation of the Eddy Current Effects on the Inductance Gradient of Railgun","authors":"W. Yuan, P. Yan","doi":"10.1109/ELT.2008.123","DOIUrl":"https://doi.org/10.1109/ELT.2008.123","url":null,"abstract":"Inductance gradient of railgun is one of the most important parameters to railgun launch efficiency. The inductance gradient of simple railgun without metal container (tube) can be calculated via Kerrisk's approximate formula when the structure of rails is fixed. However, the metal container would be necessary if the repulsion on the rails is great enough in mega Ampere current railgun. Then eddy current will be induced in metal container because of the variable magnetic flux density. In this paper, the effects eddy current putting on the inductance gradient of railgun are investigated with Maxwell 3D modular of Ansoft Corp.. Models of railgun with metal-insulated combination containment (laminated containment) are simulated and compared with solid metal containment railgun and air containment railgun. The eddy current density and Lorentz force put on amature of each model are calculated. It is found that the inductance gradient fluctuates with the armature position relative to containment and the fluctuating amplitude decreases with the electrical conductivity. The reduction of inductance gradient is very little when the metal segments of containment are not wider than caliber. It's notable that the inductance gradient decreases rapidly near muzzle.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130576367","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: 9

The Homopolar Racer Competition: A Multi-Disciplinary Student Training Tool in Electromagnetic Launch Technology 同极赛车比赛:多学科学生电磁发射技术训练工具

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.87

T. Engel, G. M. Belarde

{"title":"The Homopolar Racer Competition: A Multi-Disciplinary Student Training Tool in Electromagnetic Launch Technology","authors":"T. Engel, G. M. Belarde","doi":"10.1109/ELT.2008.87","DOIUrl":"https://doi.org/10.1109/ELT.2008.87","url":null,"abstract":"The first electric motor, the homopolar motor, was demonstrated by Michael Faraday in 1821 at the Royal Institution of London. The homopolar motor operates on the principle that a force is produced orthogonal to current and magnetic field. The Homopolar Racer Competition (HRC) is a college-level competition created to raise awareness and interest in electromagnetic launcher technology and research and to serve as a multi-disciplinary training tool in this area. Student teams design, build, and demonstrate a homopolar motor in the form of a vehicle (i.e., the racer) that rolls along the ground. The students learn electrical, mechanical, and chemical engineering concepts along with principles from physics and material science. The racer must carry its own battery power during the race. Battery weight cannot exceed 100 grams. Scoring is based on the shortest time to travel the 10 meter track. This investigation will focus on HRC operation and design along with the rules of the event. The investigation will also report the results from the 2008 HRC event at the University of Missouri. The winning racer of that event achieved velocities of 2.4 m/s over the 10-meter track using a single battery.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127946367","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

Improvement of Inductance Gradient in Railgun Using Ferromagnetic Materials 利用铁磁材料改善轨道炮电感梯度

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.48

A. Keshtkar, A. Kalantarnia, M. Kiani

引用次数: 2

Design of a 3-Meter Long Electromagnetic Launcher 一种3米长的电磁发射器的设计

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.27

Yaohong Sun, P. Yan, W. Yuan, Jun Li, Yingchun Gui, Aimin Lv, J. Nie

{"title":"Design of a 3-Meter Long Electromagnetic Launcher","authors":"Yaohong Sun, P. Yan, W. Yuan, Jun Li, Yingchun Gui, Aimin Lv, J. Nie","doi":"10.1109/ELT.2008.27","DOIUrl":"https://doi.org/10.1109/ELT.2008.27","url":null,"abstract":"A 3-m long, 30-mm square bore launcher has been constructed for electromagnetic launch application at the Institute of Electrical Engineering, Chinese Academy of Sciences (IEECAS).The main purpose of the launcher is to conduct the basic and applied research in electromagnetic launch. An optimum structure of the insulators was adopted through the stress analysis using the software ANSYS. In order to know about the variation of the gap under a certain stress, an air pressure piston (Maximum air pressure 5 MPa) and a position sensitive detector (PSD) were adopted. The measuring results have shown that the rails gap decreases gradually from breech to muzzle; this kind of design can abate the erosion of the rails caused by arc discharge effectively. A total of 85 tests have been performed, including 17 tests of single module discharging and 68 tests of 9 modules sequential discharging, and the highest muzzle velocity of 1.9 km/s with a 45 g mass was achieved operating at a current of 410 kA, 2 ms pulse duration. This launcher is now used for the fundamental research on armature structure, performance of the pulsed power supply and the diagnostic system. A novel launcher based on the previous experimental results is under development.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130948661","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: 4

Structure Design of an "Open-Bore" Electromagnetic Launcher 一种“开孔”电磁发射装置的结构设计

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.79

J. Nie, Q. Jiao, J. Qin, Jun Li, Jingjing Han

引用次数: 1

Electromagnetic Launching System for Automobiles 汽车电磁发射系统

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.36

Jiange Zhang, Yang Xiang, Lie Tao, Xiaohui Liu

引用次数: 0

The Study of Electric Field of High-Power Supercapacitors 大功率超级电容器的电场研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.113

Jinyan Song, Li Zhang, Ji-Yan Zou

引用次数: 3

The Effect of Shield Orifice on the Electromagnetic Interference Factor in HPM 屏蔽孔对HPM电磁干扰系数的影响

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.86

A. Keshtkar, A. Kalantarnia

引用次数: 0

Analytical Analysis of Flow in a Magnetohydrodynamic Pump (MHD) 磁流体动力泵(MHD)内部流动的解析分析

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.117

M. Ghassemi, H. Rezaeinezhad, A. Shahidian

{"title":"Analytical Analysis of Flow in a Magnetohydrodynamic Pump (MHD)","authors":"M. Ghassemi, H. Rezaeinezhad, A. Shahidian","doi":"10.1109/ELT.2008.117","DOIUrl":"https://doi.org/10.1109/ELT.2008.117","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 to design a magnetohydrodynamic pump. The purpose of this study is to analytically investigate the effect of Hartman number as well as magnetic and electrical angular frequency on the velocity distribution in a magnetohydrodynamic pump. To solve the governing differential equation, initially a velocity profile is guessed and then the Navier-Stokes is solved. Results show that as Hartman number approaches zero the velocity profile becomes similar to that of fully developed flow in a pipe. Furthermore, for frequency over 10pi rad/sec the flow can be treated as steady state. However below angular frequency of 10pi rad/sec velocity oscillates constantly. Therefore flow can not be treated as steady state.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133013319","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: 10

MFCG as Future Military PPS MFCG作为未来军事PPS

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.108

Q. Lv, Bin Lei, Mingliang Gao, Zhi-yuan Li, X. Chi, He Li

{"title":"MFCG as Future Military PPS","authors":"Q. Lv, Bin Lei, Mingliang Gao, Zhi-yuan Li, X. Chi, He Li","doi":"10.1109/ELT.2008.108","DOIUrl":"https://doi.org/10.1109/ELT.2008.108","url":null,"abstract":"As a kind of mobile pulsed power supply (PPS), the magnetic flux compression generator (MFCG) can be used in many military fields, but the MFCG concept has not been explored systematically. The definitions of MFCG were given in two ways: the electric circuit model and the magnetic field model, and the latter was indispensable to resolve many technical difficulties. According to the field model, the working principles of the MFCG with perfect solenoid were shown as the magnetic flux conservation or the magnetic flux linkage conservation. The inherent coherence of the two definitions was also outlined. The names of MFCGs were discussed, and the distinguishing features of MFCG from other pulsed generators were summarized. According to the different forms of the windings and the different moving modes of the armatures, 14 kinds of MFCGs were classified systematically, and their characteristics were generalized respectively. The most useful kinds of MFCGs were the piston type, the explosive one, and the rotary one. Their technical aspects were reviewed. The key technology of the piston type MFCG was analyzed and the conclusion is that the conical armature without any longitudinal slits on its surface is necessary. The working process of the two stages explosive MFCG for the microwave bomb was analyzed: the first stage as a magnetic energy accumulator, and the second as a pulsed generator. The CPA, as a kind of rotary MFCG, was developed as a kind of drum alternator in the big ship to power the EM launcher. All those essential work was important for MFCG concept, theory research, technology development, and military applications.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133476583","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