2008 14th Symposium on Electromagnetic Launch Technology最新文献

Mesoscale Contact Characteristics under Current Transfer 电流传递下的中尺度接触特性

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.58

L. Brown, D. Xu, K. Ravi-Chandar, S. Satapathy

{"title":"Mesoscale Contact Characteristics under Current Transfer","authors":"L. Brown, D. Xu, K. Ravi-Chandar, S. Satapathy","doi":"10.1109/ELT.2008.58","DOIUrl":"https://doi.org/10.1109/ELT.2008.58","url":null,"abstract":"Sliding metal-on-metal wear experiments were conducted at the meso-scale within a controlled environment chamber to evaluate the influence of current density, polarity, and humidified gas on system wear behavior. A meso-scale friction tester (MFT) was modified by enclosing the apparatus with an environmental chamber used for introducing humidified gases. Additionally, a high capacity direct current precision power supply was used to supply current through the contact interface of the test materials. Wear rates were observed to decrease with increasing levels of humidity. This observation is in agreement with previous experiments of this nature, but had not been conducted within this scale of measurement. Scanning electron microscopy (SEM) analysis of the wear areas and energy dispersive spectrometer (EDS) analyses suggest the possibility of micro arcing and melting during the evolution of the wear track. The static friction forces and the periods of stick slip were found to correlate with the grain size distribution. Experimental measurement of weld force and blow off force was found to correlate poorly with the theoretically predicted values, and could be attributed to scaling effects not included in the models.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"107 5 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":"127004970","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

Capture Dynamics of Coaxial Magnetic Brakes 同轴磁制动器的捕获动力学

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.20

P. Putman, K. Salama

引用次数: 3

The Research of a Novel Brushless DC Linear Motor for Electromagnetic Launcher 电磁发射器用新型无刷直流电动机的研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.138

Hongxin Wu, B. Kou, Liyi Li

引用次数: 0

High Voltage Super-Capacitors for Energy Storage Devices Applications 用于储能设备的高压超级电容器

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.102

Li Zhang, Jinyan Song, Ji-Yan Zou, Ning Wang

{"title":"High Voltage Super-Capacitors for Energy Storage Devices Applications","authors":"Li Zhang, Jinyan Song, Ji-Yan Zou, Ning Wang","doi":"10.1109/ELT.2008.102","DOIUrl":"https://doi.org/10.1109/ELT.2008.102","url":null,"abstract":"Super-capacitor has the characteristics of big capacitance, high energy density, long cycle life, quick charge and discharge compared with traditional capacitors, which is regarded as a new-style energy storage element. The general demands for super-capacitors are high working voltage, big capacitance and low resistance for pulse power supply applications, especially for the pulse power supply of electromagnetic launch system applications. However the working voltage of existing super-capacitors is very low (<3.5 V), which has restricted its further applications. To meet the requirements of high voltage, it has to be connected some units of super-capacitors in series. But the total capacitance of energy storage device decreases, and the inner resistance increases. In the paper, a high voltage super-capacitor of 100 V, 5.8 mF, 0.05 Omega was introduced. The super-capacitor is composed of anode of electrolytic capacitors, cathode of electrochemical capacitors and 38 wt% H2SO4 electrolyte solution. By electric test, the super- capacitor has the properties of large capacitance and high energy density, which is an idea energy storage element. Energy storage device of 100 V/3 kJ is constructed with 100 high voltage super-capacitors in parallel; it can be set between battery and pulse load as intermediate energy storage device instead of electrolytic capacitors to enhance energy density and power density of power supply system. The test and simulation results show that the energy storage device can provide a discharge current of 2000 A, and peak power up to 200 kW.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"57 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":"132371941","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: 20

High Current, High Voltage Solid State Discharge Switches for Electromagnetic Launch Applications 电磁发射用大电流、高电压固态放电开关

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.45

A. Welleman, R. Leutwyler, J. Waldmeyer

{"title":"High Current, High Voltage Solid State Discharge Switches for Electromagnetic Launch Applications","authors":"A. Welleman, R. Leutwyler, J. Waldmeyer","doi":"10.1109/ELT.2008.45","DOIUrl":"https://doi.org/10.1109/ELT.2008.45","url":null,"abstract":"This presentation is about the work done on design, built-up, production and test of ready-to-use solid state switch assemblies using Thyristor- or IGCT technology. The presented thyristor switch assemblies, using 120 mm wafer size, are made to switch 3MJ stored energy into a load. The maximum charge voltage of the assembly is 12 kVdc, current capability more than 260 kA@tp=3.3 ms and a pulse repetition rate of up to 6 shots per minute with convection air cooling. New very large thyristors with 150 mm wafer diameter will be available from fall 2008. As second a 70 kA/21 kVdc switch using IGCT technology will be presented. The switch is designed for fast discharge in the microsecond range and has a very high di/dt capability. Because for the IGCT switches a reverse conducting design can be used, damped sine waves can be handled without the use of separate anti-parallel diodes. The thyristor and IGCT switches come complete with power supplies, driver units and if required also with air- or water cooled heat sinks. Reliability figures will be mentioned as well as information collected during long-term testing. The switches are supplied as complete power blocks and all components are produced on mass production line and therefore benefit from the volume production experience and quality monitoring system. It will be concluded that ABB has long term experience with production of components and switches for highest energy in pulsed power applications like electromagnetic launch and magnetic forming.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"111 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":"121326532","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

Research on an Axial-Axial Flux Compound-Structure Permanent-Magnet Synchronous Machine Used for Hybrid Electric Vehicles 混合动力汽车用轴-轴磁通复合结构永磁同步电机的研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.69

P. Zheng, J. Zhao, Z. Tang, Lin Shen, Lina Li, F. Chai

引用次数: 2

Experimental Observations and Analysis of Armatures and Rails in a Small Railgun 小型轨道炮电枢和导轨的实验观察与分析

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.41

P. Clifford, W. Maier

引用次数: 0

Research on Computer Measure and Control System of Electromagnetic Rail Gun 电磁轨道炮计算机测控系统研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.122

Fucai Liu, Shiguo Wang, Yanliu Zhang, Y. Han

{"title":"Research on Computer Measure and Control System of Electromagnetic Rail Gun","authors":"Fucai Liu, Shiguo Wang, Yanliu Zhang, Y. Han","doi":"10.1109/ELT.2008.122","DOIUrl":"https://doi.org/10.1109/ELT.2008.122","url":null,"abstract":"In order to monitor the transient state and get more data of the electromagnetic launch system in the research of the electromagnetic rail gun, many signals need to be controlled and acquired, so the computer measure and control system is an essential part of the entity. Firstly, this paper introduces the structure of the system which is controlled and measured by using serial and optical fiber communicate and data acquisition card. Secondly, it presented the block diagram of the control system and the design method of hardware circuit interface. Then, it introduces the key technology referring to multithread, data acquisition and data storage in the software. Proved by experiment, this measure and control system is steady. It realizes the isolation between signal portion and computer portion, and assured the security of equipment under super current. The launch time can be controlled by software time delay. The software has character of Modularization, integration and Windows interface. It not only can control all the experiment directly, but also can control, acquire and analyze data from much more access by expand modules.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"61 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":"132289195","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

Research on the Control of a Radial-Radial Flux Compound-Structure Permanent-Magnet Synchronous Machine Used for HEVs 混合动力汽车用径向-径向磁通复合结构永磁同步电机控制研究

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.135

P. Zheng, Ranran Liu, W. Fan, Jianqun Han, Jianwei Li, B. Kou

引用次数: 6

Analysis of Electric Parameters of a PPS System and Their Influence on Muzzle Velocity in EMG PPS系统电参数及其对EMG初速的影响分析

2008 14th Symposium on Electromagnetic Launch Technology Pub Date : 2008-06-10 DOI: 10.1109/ELT.2008.112

Yongxia Han, Fuchang Lin, Ling Dai, Lin Zou, Lei Wang, Gang Liu, L. Bo

{"title":"Analysis of Electric Parameters of a PPS System and Their Influence on Muzzle Velocity in EMG","authors":"Yongxia Han, Fuchang Lin, Ling Dai, Lin Zou, Lei Wang, Gang Liu, L. Bo","doi":"10.1109/ELT.2008.112","DOIUrl":"https://doi.org/10.1109/ELT.2008.112","url":null,"abstract":"A 500 kJ compact pulsed power supply (PPS) system used for electromagnetic railgun (EMG) system has been developed to investigate the influence of electric parameters on muzzle velocity in the paper, from which the stability and reliability of the PPS system can be evaluated. The pulsed power supply system consists of ten modules, and each module is composed of a high energy density capacitor, a triggered vacuum switch, a pulse shaping inductor, a dump resistor and a crowbar. Influence of different parameters on the velocity was analyzed by ATP simulations in this paper. The parameters include capacitance, equivalent series resistance (ESR) of the capacitor, inductance, natural electric parameter and jitter time of the TVS. The ESR and natural electric parameters are critical influencing factors by comparing the simulation and experimental results. In the end, muzzle velocity deduced by the current, which is obtained from a new model of actual circuit, is about twenty percent lower than that in ideal condition. It is pointed out that the velocity error is mostly caused by ESR and natural electric parameter.","PeriodicalId":170049,"journal":{"name":"2008 14th Symposium on Electromagnetic Launch Technology","volume":"95 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":"115001329","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