On the role of induced fields in railguns

Côté, Paul J.; Johnson, Mark A.; Truszkowska, K.; Vottis, P.

doi:10.1088/0022-3727/40/1/026

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Electromagnetic Railgun with a solid-armature is a hypervelocity launcher and can accelerate projectile from stationary to 2km/s in several seconds. Over the past decades, research has been focused on the fundamental understanding of Electromagnetic railgun [1][2][3][4] and on the accuracy of experimental control on launching velocity. Even at low speed (<300m/s), the reason for producing any deviation in velocity remains unclear [5].…”

Section: Introductionmentioning

confidence: 99%

The Research on the Launching Consistence of Small Caliber Electromagnetic Railgun

Zhang¹,

Yang²,

Li³

et al. 2012

AMM

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Electromagnetic railgun can perform precision strike in long range. It is obtained that the scatter of velocity must be exist because there are many effectors influencing launching process, for example, the manufacturing error, the initial value of launching parameters and uncertainty during launching process and so on. Among these factors, the parameters of armature are easy to adjust to ensure the consistence of velocity. So we attempt to apply Grey Analyzing Model to carry on the study, and then by means of the measurement of strain on the barrel to verify the model. The result shows that the reasonable matching of armature mass and diameter can be helpful to improve the consistence of armature muzzle with the other parameters the same. This method is a new attempt to study the stability and consistence of velocity of solid armature.

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Section: Introductionmentioning

confidence: 99%

The Research on the Launching Consistence of Small Caliber Electromagnetic Railgun

Zhang¹,

Yang²,

Li³

et al. 2012

AMM

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“…The magnetic field B is generated within the rails behind the armature which has accelerated the armature to velocity v. When there is no armature motion, the voltage distribution for the railgun in Fig. 1 is given by (Cote, 2007):…”

Section: Introductionmentioning

confidence: 99%

Determing the Time Dependence of Electrical Gradients in Railguns using the Transmission Line

Johnson¹,

Côté²

2008

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information 5a. CONTRACT NUMBER. Enter all contract numbers as they appear in the report, e.g. F33615-86-C-5169. 5b. GRANT NUMBER.Enter all grant numbers as they appear in the report, e.g. AFOSR-82-1234. 5c. PROGRAM ELEMENT NUMBER.Enter all program element numbers as they appear in the report, e.g. 61101A.5d. PROJECT NUMBER. Enter all project numbers as they appear in the report, e.g. 1F665702D1257; ILIR.5e. TASK NUMBER. Enter all task numbers as they appear in the report, e.g. 05; RF0330201; T4112.5f. WORK UNIT NUMBER. Enter all work unit numbers as they appear in the report, e.g. 001; AFAPL30480105. AUTHOR(S). Enter name(s) of person(s)responsible for writing the report, performing the research, or credited with the content of the report. The form of entry is the last name, first name, middle initial, and additional qualifiers separated by commas, e.g. Smith, Richard, J, Jr. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES). Self-explanatory. PERFORMING ORGANIZATION REPORT NUMBER.Enter all unique alphanumeric report numbers assigned by the performing organization, e.g. BRL-1234; AFWL-TR-85-4017-Vol-21-PT-2. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES).Enter the name and address of the organization(s) financially responsible for and monitoring the work. SPONSOR/MONITOR'S ACRONYM(S).Enter, if available, e.g. BRL, ARDEC, NADC. SPONSOR/MONITOR'S REPORT NUMBER(S).Enter report number as assigned by the sponsoring/ monitoring agency, if available, e.g. BRL-TR-829; -215. DISTRIBUTION/AVAILABILITY STATEMENT. ABTRACTA new technique has been developed for determining the time dependence of the inductance and resistance gradients of electromagnetic launchers. These are fundamental parameters when estimating launcher performance. The method is based on our analysis that shows how a transmission line model describes the relationship between the voltage gradient along the launcher rails and the rate of change of current. The approach extracts the gradients from experimental data by solving the normal equations associated with the transmission line model. An electromagnetic launcher was developed to test this new approach and experimental results are in excellent agreement with predicted behavior. This new technique provides a straightforward means to accurately determine the gradients of experimental designs under dynamic conditions. The data for these gradients are new and not available by any other known technique.

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“…Instead, the emfs responsible for the high fields that tend to generate plasmas behind the armature originate from rapid changes in rail current and from the motion of the armature. A theoretical treatment of these induced emfs is presented in reference [3].…”

Section: Introductionmentioning

confidence: 99%

Analysis of HEMCL Railgun Insulator Damage

Côté¹,

Johnson²,

Truszkowska³

et al. 2006

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On the role of induced fields in railguns

Cited by 4 publications

References 13 publications

The Research on the Launching Consistence of Small Caliber Electromagnetic Railgun

The Research on the Launching Consistence of Small Caliber Electromagnetic Railgun

Determing the Time Dependence of Electrical Gradients in Railguns using the Transmission Line

Analysis of HEMCL Railgun Insulator Damage

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