Integrated launch package design with considerations for reduced-scale demonstration

Zielinski, A.E.

doi:10.1109/tmag.2002.806371

Cited by 15 publications

(5 citation statements)

References 11 publications

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“…The rail has a rectangular cross section and is mechanically supported by a rigid insulation and a containment structure [10]. The structural response of the rail can be modeled as a beam sitting on an elastic foundation, as shown in Figure 2.…”

Section: Discussionmentioning

confidence: 99%

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

Tzeng¹

2002

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A model is developed to investigate the dynamic response of an electromagnetic rail gun induced by a moving magnetic pressure during launch of projectiles. As the projectile velocity approaches a critical value, resonance can occur and cause high-amplitude stress and strain in the rail at the instant and location of the projectile's passage. In this study, governing equations of a railgun under dynamic-loading conditions are derived that illustrate a lower-bound critical velocity in terms of material properties, geometry, and barrel cross section. A study is then performed to show the effect of these parameters on the critical velocity of the barrel. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide barrel design.ii

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Section: Discussionmentioning

confidence: 99%

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

Tzeng¹

2002

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“…4. R. L. Ellis [12] and Alexander E. Zielinski [13] presented some methods to design armature, according to the methods, the length of armature tail and the thickness of armature leader can be obtained and shown in table Ⅱ.…”

Section: Fundamental Structural Parameters Of Armaturementioning

confidence: 99%

Optimizing study on the concave arc surfaced C-shaped armature with medium and small caliber

Tang

Chen

et al. 2014

2014 17th International Symposium on Electromagnetic Launch Technology

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Previous studies on solid armatures show that in a railgun system, concave arc surfaced C-shaped armature (ASCA) can improve the contact pressure and current distribution at the armature/rail (A/R) interface. However, concrete design or parameter study of the concave ASCA is rarely mentioned. In fact, besides the basic structural parameters for conventional C-shaped armatures, there are two more key structural parameters for concave ASCA, namely the radius ( r ) and the central angle ( θ ) of their surface arc.In this paper, three matching models of concave armature contacting with corresponding rail structure are discussed and compared, and consequently the best structure pattern of the contact is presented. Meanwhile, the radius and the central angle of the arc in the ASCA are proposed and analyzed. With a fixed railgun caliber and minimum thickness of armature trailing edge, the optimal θ and r are determined according to the current distribution obtained in simulation. The concave ASCAs for squarecaliber railgun of 20 mm, 30 mm, 40 mm and 50mm calibers are discussed, and their optimal structural parameters are presented respectively. Index Terms-central angle, concave arc surfaced C-shaped armature, current distribution, optimal structure parameter

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“…After the launch package has left the barrel, the projectile has to separate from the armature and sabot to embark on its free flight trajectory. Work at other research labs concerning the development and testing of electromagnetic gun launch packages is described in the recent literature [3]- [6]. The aim of the investigation described in this report is to demonstrate that close to realistic projectiles can be successfully launched with the existing railgun technology.…”

Section: Introductionmentioning

confidence: 99%

Developing a Launch Package for the PEGASUS Launcher

Hundertmark

Vincent

Simicic

2017

IEEE Trans. Plasma Sci.

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Abstract-Railguns are capable to far exceed the muzzle energies of current naval deck guns. Therefore one of the most promising scenario for the future application of railguns in naval warfare is the long range artillery. Hypervelocity projectiles being propelled to velocities above 2 km/s reach targets at distances of 200 km or more. At the French-German Research Institute the PEGASUS launcher is used for investigations with respect to this scenario. The 6 m long barrel has a square caliber of 40 mm. The power supply unit is able to deliver 10 MJ to the gun. Within this investigation, a complete launch package is being developed and experiments are performed that aim at showing that this package can be accelerated to velocities ranging from 2000 m/s to 2500 m/s. A launch package consists out of an armature, a sabot and the projectile. The armature ensures the electrical contact during launch and pushes the sabot with its payload through the barrel. The sabot guides and protects the payload during the acceleration. At the same time the accelerating forces generated at the armature needs to be transferred to the projectile. After the launch package has left the barrel, the sabot should open and release its payload, the projectile into free-flight. Here the the current status of the launch package development and results from Experiments with the PEGASUS railgun are presented. I. IntroductionThe PEGASUS railgun installation at the French-German Research Institute (ISL) is being used for experiments in support of research for a long range artillery scenario. In future and current modern naval ships, the electric power requirements for a large muzzle energy railgun can be meet [1], [2]. Compared to existing naval deck guns the large muzzle velocities of 2 km/s to 3 km/s require the development of new guided hypervelocity projectiles. In response to this, activities for the design of such a projectile have started at ISL. The sub-caliber projectile is embedded in a sabot when launched with a railgun. This sabot ensures the mechanical contact to the armature, guidance through the railgun barrel and mechanical protection. Depending on the sensitivity of the on-board electronics of the projectile the sabot might also need to incorporate a shielding function against electromagnetic interference from the electromagnetic fields during railgun operation. The assembly of the armature, the sabot and the projectile is termed launch package. After the launch package has left the barrel, the projectile has to separate from the armature and sabot to embark on its free flight trajectory. Work at other research labs concerning the development and testing of electromagnetic gun launch packages is described in the recent literature [3]- [6]. The aim of the investigation described in this report is to demonstrate that close to realistic projectiles can be successfully launched with the existing railgun

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Integrated launch package design with considerations for reduced-scale demonstration

Cited by 15 publications

References 11 publications

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

Critical Velocity of Electromagnetic Rail Gun in Response to Projectile Movement

Optimizing study on the concave arc surfaced C-shaped armature with medium and small caliber

Developing a Launch Package for the PEGASUS Launcher

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