Micrometeoroid impact simulations using a railgun electromagnetic accelerator

Upshaw, J.L.; Kajs, J.P.

doi:10.1109/20.101103

Cited by 20 publications

(5 citation statements)

References 2 publications

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“…Physical tests, when the protective material is directly exposed in orbit, is expensive and takes a long time, so for reach this range of speed for the experiment the EM launcher is used. They are used to investigate the effects of micrometre shock protection when the target is struck from 10 -4 to 10 -7 g particles accelerated up to 11 km/s (Upshaw and Kajs 1991).…”

Section: A) B)mentioning

confidence: 99%

Magnetomechanical study of open-bore two-rail electromagnetic launcher

Račkauskas¹

2018

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Section: A) B)mentioning

confidence: 99%

Magnetomechanical study of open-bore two-rail electromagnetic launcher

Račkauskas¹

2018

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“…O zamandan beri elektromanyetik fırlatıcılar birçok araştırmaya konu olmuştur. Örneğin insansız hava araçları [5], tuzak karşı önlem [6], [7], havan [8], füze [8]), uzun menzilli silahlar [9] ve yüksek hız uygulamaları [10], fizik uygulamaları [11]), titreşim testi [12] için elektromanyetik fırlatıcılar (EML) geliştirilmiştir. Uzun bir gelişim süreci olan elektromanyetik fırlatıcıların farklı geometride birçok çeşidi imal edilmiş ve performansı değerlendirilmiştir [13].…”

Section: Introductionunclassified

A new magnetic launcher design and analysis: An ANSYS Maxwell application

Bicakcı

Çıtak

2023

Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada herhangi bir mekanik itici kullanmadan halka ve silindirik şeklindeki sabit mıknatıslardan oluşturulmuş yeni bir manyetik fırlatıcı tasarımı önerilmiştir. Tasarımda önce iki halka mıknatıs kullanılmış daha sonra her seferinde bir halka mıknatıs ilave edilerek fırlatıcı boyu değiştirilmiştir. Farklı boylardaki fırlatıcı tasarımlarında halka mıknatıslar arası mesafe sabit değerde arttırılmış ve fırlatılacak mıknatıs merminin kesiti de değişken tutulmuştur. ANSYS Maxwell simülasyon program kullanılarak oluşturulan boyları farklı her bir fırlatıcı tasarımı için mıknatıs mermiye uygulanan manyetik kuvvetin konuma göre değişimleri analiz sonrasında belirlenmiştir. Böylece mermi kesiti değişiminin ve fırlatıcı boyunun sabit kademelerle arttırılmasının manyetik kuvvete olan etkileri bulunmuştur. Ayrıca mermiye etkiyen manyetik kuvvette etkin rol oynayan halka mıknatıslar yerine bobin kullanılması durumunda bobin ile ilgili değişkenlerin belirlenmesine de çalışılmıştır. Böylece bobine verilecek değişken akıma göre itici kuvvetin de değiştirilebilir olması sağlanabilmiştir. Makalede fırlatıcı tasarımlarının ANSYS Maxwell programıyla oluşturulması ve elde edilen sonuçlar ayrıntılı olarak tartışılmıştır.

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“…Such accelerators are used in test installations for shock loads, in high-speed electrical devices and valve-switching equipment, in launchers, etc. [6][7][8][9][10][11] for example, work [12] describes a setup for testing electronic equipment in a collision with a moving object. Launchers are also used for many classes of unmanned aerial vehicles [4,13].…”

Section: Introductionmentioning

confidence: 99%

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

Bolyukh¹,

Schukin²,

Lasocki

2021

Electrical Engineering & Electromechanics

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Purpose. The purpose of the article is to determine the influence of the initial displacement of the windings on the indicators of an electromechanical induction accelerator of a cylindrical configuration with pulsed excitation from a capacitive energy storage and with short-term excitation from an alternating voltage source. Methodology. To take into account the interrelated electrical, magnetic, mechanical and thermal processes, as well as a number of nonlinear dependencies, we use the lumped parameters of the windings, and the solutions of the equations describing these processes are presented in a recurrent form. The mathematical model of the accelerator takes into account the variable magnetic coupling between the windings during the excitation of the inductor winding. When calculating the parameters and characteristics of the accelerator, a cyclic algorithm is used. Results. At a frequency of an alternating voltage source of 50 Hz, the current amplitude in the armature winding is less than in the inductor winding. With an increase in the source frequency to 250 Hz, the phase shift between the winding currents decreases. The current in the inductor winding decreases, and in the armature winding it increases. The accelerating components of the force increase, and the braking ones decrease. With an increase in the source frequency to 500 Hz, the current density in the armature winding exceeds that in the inductor winding. In this case, the phase shift between the windings is further reduced. Originality. When a cylindrical accelerator is excited, the largest amplitude of the current density in the inductor winding occurs at the maximum initial displacement of the windings, but the amplitude of the current density in the armature winding is the smallest. The largest value of the current density in the armature winding occurs in the absence of an initial displacement. When excited from a capacitive energy storage, the electrodynamic force between the windings has an initial accelerating and subsequent braking components. As a result, the speed of the armature initially increases to a maximum value, but decreases towards the end of the electromagnetic process. When a cylindrical accelerator is excited from an alternating voltage source, a phase shift occurs between the currents in the windings, which leads to the appearance of alternating accelerating and decelerating components of electrodynamic forces. The accelerating components of the force prevail over the braking components, which ensures the movement of the armature. Practical value. At a frequency of an alternating voltage source of 50 Hz, the highest speed at the output of the accelerator vzf=0.5 m/s is realized at an initial displacement of the windings z0=6.2 mm, at a frequency of 250 Hz, the highest speed vzf=2.4 m/s is realized at z0=3.1 mm, and at a frequency of 500 Hz the highest speed vzf=2.29 m/s is realized at z0=2.3 mm.

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Micrometeoroid impact simulations using a railgun electromagnetic accelerator

Cited by 20 publications

References 2 publications

Magnetomechanical study of open-bore two-rail electromagnetic launcher

Magnetomechanical study of open-bore two-rail electromagnetic launcher

A new magnetic launcher design and analysis: An ANSYS Maxwell application

Influence of the initial winding displacement on the indicators of the electromechanical induction accelerator of cylindrical configuration

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