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 Simple equations for coilgun There is often need to assess some parameters of coilgun (e.g. peak current to choose an appropriate power switch) quickly. Exact formulae (given here) may be used, but it is more convenient to establish few simple relations.  This section collects such relactions for different cases. .u-star-rating-16 { list-style:none;margin:0px;padding:0px;width:80px;height:16px;position:relative;background: url('/.s/t/1321/rating.png') top left repeat-x } .u-star-rating-16 li{ padding:0px;margin:0px;float:left } .u-star-rating-16 li a { display:block;width:16px;height: 16px;line-height:16px;text-decoration:none;text-indent:-9000px;z-index:20;position:absolute;padding: 0px;overflow:hidden } .u-star-rating-16 li a:hover { background: url('/.s/t/1321/rating.png') left center;z-index:2;left:0px;border:none } .u-star-rating-16 a.u-one-star { left:0px } .u-star-rating-16 a.u-one-star:hover { width:16px } .u-star-rating-16 a.u-two-stars { left:16px } .u-star-rating-16 a.u-two-stars:hover { width:32px } .u-star-rating-16 a.u-three-stars { left:32px } .u-star-rating-16 a.u-three-stars:hover { width:48px } .u-star-rating-16 a.u-four-stars { left:48px } .u-star-rating-16 a.u-four-stars:hover { width:64px } .u-star-rating-16 a.u-five-stars { left:64px } .u-star-rating-16 a.u-five-stars:hover { width:80px } .u-star-rating-16 li.u-current-rating { top:0 !important; left:0 !important;margin:0 !important;padding:0 !important;outline:none;background: url('/.s/t/1321/rating.png') left bottom;position: absolute;height:16px !important;line-height:16px !important;display:block;text-indent:-9000px;z-index:1 } Coilgun calculations | Views: 16 | Added by: Eugen | Date: 21.06.2017 | Comments (0)

 Investigation of stability of multistage coilgun accelerator with and without feedback to variation of the initial parameters Variation of the parameters such as capacitance, initial projectile velocity etc and its influence on acceleration efficiency  is analyzed for two base configurtions of the accelerator - with and without feedback. Coilgun calculations | Views: 37 | Added by: Eugen | Date: 14.10.2016 | Comments (0)

 Investigation of conditions of aerodynamic stabilization of arrow During the work on EM-2 and EM-3 projects, the author of this paper has performed some experiments and calculations, which resulted in creation of unfinned arrow for electromagnetic accelerator.  Nonetheless, I became interested in this question and (after EM-3 projected was finished) decided to conduct more detailed investigation, which is described in this paper. Coilgun calculations | Views: 122 | Added by: Eugen | Date: 15.03.2016 | Comments (0)

 Simple assessment of scattering of the coilgun’s projectiles, or why we cannot build a ball-firing gauss-gun This short article considers mathematical estimation of the projectile spread during reluctance accelerator shooting. Using simple formulae, conservative assessments are conducted for cylindrical and sphere-shaped projectiles. Coilgun calculations | Views: 134 | Added by: Eugen | Date: 13.01.2016 | Comments (0)

 Sequential feeding system The sequential electromagnetic feeding system for coilgun is described, operating on the "travelling wave" principle. The system is tuned for standard 4.5 mm steel balls and has capacity of 17 charges. Feeding systems | Views: 176 | Added by: Eugen | Date: 04.12.2015 | Comments (0)

 Investigation of the recovery efficiency in a halfbridge electromagnetic accelerator Analytical solution describing recuperation of the energy for the diagonal halfbridge scheme is performed. Efficiency is analyzed for variety of conditions inherent to the real coilgun implementations. Coilgun calculations | Views: 46 | Added by: Eugen | Date: 16.11.2015 | Comments (0)

 Inductive sensor of projectile The theory of inductive sensor using the current shape in coil to detect a projectile is presented. Experimental setup which realizes this principle is also described. Detectors | Views: 46 | Added by: Eugen | Date: 15.11.2015 | Comments (0)

 Mathematics of a coilgun Basic equations for current and voltage in RLC-circuit of one-stage coilgun are presented in this article. Using them, some interesting specific cases of practical importance are analyzed (for example, current decay in a half-bridge recuperative coilgun). Coilgun calculations | Views: 103 | Added by: Eugen | Date: 07.11.2015 | Comments (0)

 Proximity sensor IR proximity sensor for safe loading of the coilgun is described. Detectors | Views: 99 | Added by: Eugen | Date: 29.10.2015 | Comments (0)

 Arrow for electric bow This article bases on results of experiments conducted when EM-2 and EM-3 coilguns were being constructed. Their purpose was to  obtain accelerated body (projectile), optimal for portative electromagentic accelerators. Besides, I had to do some caluclations and Web data retrieval. The findings of those investigations are presented. Other | Views: 134 | Added by: Eugen | Date: 29.10.2015 | Comments (0)

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