2008 14th Symposium on Electromagnetic Launch Technology最新文献_第6页

High Velocity Linear Induction Launcher with Exit-Edge Compensation for Testing of Aerospace Components 用于航天部件试验的出口边缘补偿高速直线感应发射装置

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.137

S. Kuznetsov, D. Marriott

引用次数: 4

Simulation of Electromagnetic Launcher of Active Electromagnetic Armor 主动电磁装甲电磁发射装置仿真

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.132

Yanjie Cao, Chengxue Wang, Huijin Wang, Hongbo Jin

引用次数: 3

Investigation on the Time-Varying Inductance Gradient of Railgun 轨道炮时变电感梯度的研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.120

W. Yuan, Liqiang Sun, C. Ren, P. Yan

{"title":"Investigation on the Time-Varying Inductance Gradient of Railgun","authors":"W. Yuan, Liqiang Sun, C. Ren, P. Yan","doi":"10.1109/ELT.2008.120","DOIUrl":"https://doi.org/10.1109/ELT.2008.120","url":null,"abstract":"The inductance gradient of railgun is one of the key factors in the EM railgun launcher. Generally, people take it as a constant value during simulation, but in fact it is variable in firing. Better understanding of the inductance gradient during launching is helpful to the predicting of the armature transition velocity. To obtain the waveform of the time-varying inductance gradient, the experimental current waveform was analyzed with time-frequency analysis tools. Thus the frequency-time waveform (f-t waveform) of the load current was obtained. The 3-D railgun model was setup in Maxwell 3D modular of Ansoft Corporation. Frequency points of the f-t waveform corresponding with B-dot signals were input to the simulation model to calculate the corresponding inductance gradient and the time-varying inductance gradient was gained. It is indicated that the inductance gradient of the railgun is decreased rapidly before the load current reaches its peak value. The propelling force on the armature is calculated with the inductance gradient waveform and the load current waveform. The armature's mass will show pseudo increase at the rise of current and decrease rapidly when the armature's wings are soft enough.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"9 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":"127935283","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: 7

The Velocity and Efficiency Limiting Effects of Magnetic Diffusion in Railgun Sliding Contacts 磁扩散在轨道炮滑动触点中的速度和效率限制效应

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.90

Thomas G. Engel, Jesse M. Neri, M. Veracka

{"title":"The Velocity and Efficiency Limiting Effects of Magnetic Diffusion in Railgun Sliding Contacts","authors":"Thomas G. Engel, Jesse M. Neri, M. Veracka","doi":"10.1109/ELT.2008.90","DOIUrl":"https://doi.org/10.1109/ELT.2008.90","url":null,"abstract":"The authors identify and characterize a velocity and efficiency limiting effect called contact velocity skin effect (VSEC) which occurs in the interface of a railgun's sliding contact. Despite enormous contact forces, the armature will remain separated from the rail by a thin adsorbed layer, on the order of 10 to 15 angstroms in this investigation. Electrical conduction through the layer is via quantum tunneling which is more resistive than classical conduction through the conductor. A comprehensive theory to account VSEC is presented and is applicable to all constant gradient electromagnetic launchers. The theory not only accounts for the velocity-limit effect, but also predicts a maximum efficiency. Theoretical parameters include the inductance gradient, system resistance, projectile velocity, and sliding contact area. Theoretical predictions are compared to experimental data from a conventional and an augmented railgun. The augmented railgun is a 3-turn augmented system with 40 mm bore x 750 mm length typically operating at 250 kA peak current with a projectile velocity of 300 m/s. The conventional railgun is 40 mm bore x 4000 mm length which typically operates at 850 kA with a projectile velocity of 1600 m/s. The characterization of VSEC predicts velocity saturation and efficiency roll-off in electromagnetic launchers and provides new insights into EML operation and physics especially with regard to the armature and its contacts.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"9 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":"131980511","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: 13

Projectile-Stacked Launch Techniques for Electromagnetic Railgun 电磁轨道炮叠放发射技术

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.128

Jiange Zhang, G. Gu, Yuexin Liu

引用次数: 0

The Thrust Characteristics Investigation of Double-Side Plate Permanent Magnet Linear Synchronous Motor for EML EML双极板永磁直线同步电机推力特性研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.53

B. Kou, Hongxin Wu, Liyi Li

引用次数: 14

ICCOS Counter-Current Thyristor High-Power Opening Switch for Currents up to 28 kA ICCOS逆流晶闸管大功率开路开关，电流高达28ka

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.103

P. Dedié, S. Scharnholz, V. Brommer

{"title":"ICCOS Counter-Current Thyristor High-Power Opening Switch for Currents up to 28 kA","authors":"P. Dedié, S. Scharnholz, V. Brommer","doi":"10.1109/elt.2008.103","DOIUrl":"https://doi.org/10.1109/elt.2008.103","url":null,"abstract":"Inductive energy storage systems require opening switches, being technically much more difficult to realize than closing switches. Most advanced state-of-the-art semiconductor devices, namely integrated gate-commutated thyristors (IGCTs), are capable of breaking currents in the order of 4 kA. However, the ISL has developed a high-power opening switch based on standard high-power thyristors and using our so-called ICCOS counter-current commutation principle. These ICCOS opening switches, being capable of interrupting pulse currents up to 28 kA, exploit the general property of thyristors that falling short of the holding current puts a thyristor into its blocking state. For this, a well-dimensioned counter-current pulse is injected, via an elaborate circuit, into the thyristor being in its conducting state. A 50 muF capacitor is used as counter-current pulse source, as well as a fast current rise thyristor and a fast recovery diode for the counter-current subcircuit. The counter-current energy stored in the dedicated capacitor is not lost in the switching process but fed into the load, in addition to the main circuit energy. The realized ICCOS switch-off time is about 30 mus.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"232 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":"124187143","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

Development of 120-mm Electro-Thermal Chemical Launcher 120毫米电热化学发射器的发展

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.29

Fenglin Yao, Jun Li, Yingchun Gui, Peizhu Liu, Shizhong Li, Jiannian Dong, Mingan Zhang, P. Yan

引用次数: 0

Research on Inter-Stage Coupling of 3-Stage Reconnection Electromagnetic Launching System 三级重联电磁发射系统级间耦合研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.70

Liyi Li, Xiaopeng Li, Qiguo Li, Tao Yu, Peng Li

引用次数: 1

Magnetic Diffusion in Railguns: Measurements Using CMR-Based Sensors 磁扩散轨道炮:测量使用基于cmr的传感器

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 1900-01-01 DOI: 10.1109/elt.2008.55

M. Schneider, O. Liebfried, V. Stankevič, S. Balevičius, N. Žurauskienė

引用次数: 0