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2020, International Journal of Engineering Research and Technology (IJERT)
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4 pages
1 file
https://www.ijert.org/electromagnetic-launcher-review-of-various-structures https://www.ijert.org/research/electromagnetic-launcher-review-of-various-structures-IJERTV9IS090223.pdf A theoretic review of electromagnetic coil-gun launcher and its types are illustrated in this paper. In recent years conventional launchers like steam launchers, chemical launchers are replaced by electromagnetic launchers with auxiliary benefits. The electromagnetic launchers like rail-gun and coil-gun elevated with multi pole field structure delivers great muzzle velocity and huge repulse force in limited time. Various types of coil-gun electromagnetic launchers are compared in this paper for its structures and characteristics. The paper focuses on the basic formulae for calculating the values of inductance and resistance of electromagnetic launchers.
International Journal of Engineering Research and, 2020
A theoretic review of electromagnetic coil-gun launcher and its types are illustrated in this paper. In recent years conventional launchers like steam launchers, chemical launchers are replaced by electromagnetic launchers with auxiliary benefits. The electromagnetic launchers like rail-gun and coil-gun elevated with multi pole field structure delivers great muzzle velocity and huge repulse force in limited time. Various types of coil-gun electromagnetic launchers are compared in this paper for its structures and characteristics. The paper focuses on the basic formulae for calculating the values of inductance and resistance of electromagnetic launchers.
International Journal of Engineering Research and Technology (IJERT), 2018
https://www.ijert.org/a-review-on-technological-advancement-in-electromagnetic-coil-gun-system https://www.ijert.org/research/a-review-on-technological-advancement-in-electromagnetic-coil-gun-system-IJERTCONV6IS15038.pdf A ground based electrically powered launcher could significantly reduce the complexity and cost of space launches for moderate weight payloads. This paper presents results of a study to estimate the required parameters. This study is based on electromagnetic gun technology which is constrained to a coaxial geometry to take advantage of the efficiency of closely coupled coils. Each coil is sequentially fired as the projectile moves down the bore. A hybrid power electronic system has been used for firing of a projectile without any chemical substances, without any loud noise and without fire. There's been speculation that, this paper has involved in this research. With this in mind, this paper humbly presents the crown jewel of the electronic weaponry, which brings a great revolution in the field of advanced weaponry systems in our country and makes us proud.
International Journal of Engineering and Technology
This paper presents a model of electromagnetic coil gun launcher with simulation studies and experimental model validating the proposed strategy. Military research organisations are recently developing electromagnetic rail gun launcher for long range weapons that launch projectile electrically instead of chemical propellants at a speed exceeding Mach 7. Even though Rail gun launchers are used for long range weapons, it suffers from barrel wear down after a dozen of shell firing and weapon heat generated degrading the performance. It requires non-flammable liquid gas like nitrogen for reducing the heat generated at the rail barrel. Instead of rail guns, coil guns are more safe and accurate for high velocity military weapons. Coil gun projectile have no direct contact with the high voltage coil and the projectile is passing through the barrel axis avoiding friction causing wear down. No heat is generated between projectile and stator coils Keyword-Electromagnetic Launcher, muzzle velocity, Lorentz force I. INTRODUCTION Electromagnetic Launching system is used in defence mainly for launching high-velocity missiles [1]. US Navy recently developed a 33MJ prototype which can attain a speed of MACH 7 (1 Mach= 340.3 m\s), generally atomic Blitzer rail gun [2]. According to present status, the system is capable of reaching more than 100 nautical miles (1nm = 1.852 m\s) in several minutes. Since rail guns are simple in construction, their thermal management is highly complex, and it needs plasma discharge losses. Large installation cost, high-grade thermal insulation are some of the other requirements for the rail gun type electromagnetic launcher. Thus trying to concentrate on Electromagnetic Launcher (EML), where actuator force is given by coil (or solenoid) is considered as the research topic. Finite Element Analysis (FEA) models provide a platform for estimation and analysis of the magnetic force associated with a coil [3]. Electromagnetic launch pads find their application even in weather forecasting [4].When a current flowing through a winding produces a magnetic field, the magnetic field will exert a force (Lorentz force) given by the right-hand rule [5]. The muzzle velocity attained by the projectile used in an electromagnetic launcher is dependent on the charging voltage of the storage device. Since a battery is switching for a small time, the battery cannot provide a high current to flow through the coil in a short period. Capacitors can provide a very high current in a minimal time, unlike a battery. The charge across the capacitor is given to coil in three steps. First, the energy needed for acceleration is stored in the capacitor. Secondly, the energy stored in the capacitor is transmitted to the projectile in shortest possible time (high energy current peak creates a strong electromagnetic field). Third, the current pulse must be switched OFF before projectile passes half of coil length to prevent from being arrested at the centre of the magnet. The product of resistance and capacitance denotes the capacitor time constant, which characterises the charging and discharging rate. Fig.1 shows the charging-discharging voltage waveform of a capacitor. A time equalling 5τ d is required for fully charging and fully discharging of capacitor; τ d is the time constant of the resistor capacitor circuit (RC circuit). Below shown is the equation relating charging and discharging of capacitor. Value of τ D will be small either by selecting a low value of capacitor or resistance. Then the discharging of capacitor will be faster. The equations (1) and (2) show the relationship between charging and discharging time constants c and D with charging voltage V and capacitor voltage c V .
IEEE Transactions on Magnetics, 2005
Research progress in the development of a 40 mm 750 mm helical-coil electromagnetic launcher (HCEL) is presented and discussed. Significant technical problems that have been solved in this research include efficient stator commutation methods and the ability to simultaneously implement high-inductance gradient armatures. The HCEL is able to launch a 525-gram projectile to a velocity of 140 m/s. Power for the HCEL is derived from a 62.5 kJ sequentially fired pulse forming network (PFN) of 900 V (maximum) electrolytic capacitors. The experimentally measured HCEL efficiency of 18.2% is substantially greater than a conventional or augmented railgun of similar scale (i.e., equivalent mass, bore-size, and velocity). The HCEL's high launch efficiencies result from its 150 H/m inductance gradient, which is approximately 300 times greater than the inductance gradient of a conventional railgun. HCEL computer model predictions are given and compared to experimentally measured HCEL and PFN parameters including peak current, inductance gradient, acceleration time, parasitic mass ratios, and electrical-to-kinetic conversion efficiency. Scaling relationships for the HCEL are also presented and used to predict launcher operation at higher velocity and with a larger diameter bore size.
The XIX International Conference on Electrical Machines - ICEM 2010, 2010
In this paper, the performance analysis of two stages linear induction launcher (LIL) is presented. It is carried out based on current filament model (CFM) taking their transient behavior into account. A computer simulation based on the developed model, is down for predicting the electromechanical characteristics of the launcher (Current, velocity force, etc.). The section to section transitions which have significant effects on the launcher performance are also studied. Some simulation results are presented and discussed.
IEEE Transactions on Magnetics, 2003
An electromagnetic system that operates both as a rail and as a coil launcher is proposed, and its performance is analyzed. The device has a composite stator that consists of two rails properly slotted in order to allow the presence of a system of coils. The armature consists of a conductive slab sliding between the rails. Another system of slots is present in the armature where a system of short-circuited coils is placed.
9th International Conference on Electrical Engineering - ICEENG-9, 2014
This paper presents the investigation on electromagnetic launch for single stage coilgun. The proposed coilgun and its excitation circuit were designed for launching small objects few meters. A transient simulation for the projectile motion through the launcher was done using transient finite element commercial software ANSYS MAXWELL. Also a comparative comparison between different parameters is introduced including the effect of number of turns, voltage, induced current and length of coil on the exit velocity of projectile while leaving the barrel. Detailed studied cases have been investigated. The results confirm a direct proportional relation between the velocity of projectile and number of turns, voltage and induced current in coil while confirming an inverse proportional relation with the length of coil.
Results in Physics, 2019
This paper describes the concept of a Coil-Multipole Field Hybrid Electromagnetic Launcher. The electrical and magnetic equivalent circuits of coil gun and multipole field electromagnetic launch system (MFELS) are discussed. An attempt is made to analyze the combination of coil gun and MFELS. Simulation and finite element analysis are used to study the Coil-Multipole Field Hybrid Electromagnetic Launcher. A comparative study is carried out on the performance of coil gun, MFELS and coil-multipole hybrid launcher. Results shows that the speed of the proposed hybrid launcher is greater than that of a single coil gun and MFELS. Lastly, the advantages of the proposed hybrid electromagnetic launcher are discussed.
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/electromagnetic-railgun-coilgun-space-shuttle-launcher https://www.ijert.org/research/electromagnetic-railgun-coilgun-space-shuttle-launcher-IJERTV10IS060307.pdf At the present time the launching of satellites/rockets/shuttle in space there are required large amount of fuel, space and human efforts. If we use electromagnetic properties for launching shuttle in space with the use of electronics devices, it will reduce lots of human efforts and it's more reliable. This project aims to make cost-effective and using magnetic properties to reduce the usage of large amount of fuel for the space shuttle launcher. The entire staged rocket launching system employed so far is the non-reusability and the low ratio of the payload to the fuel mass which is overall termed as a propellant mass fraction which is not more than 1% has become a problem in terms of cost and in technicality. And the uplifting thrust required is also less. This problem can be solved by using a new technique based on an electromagnetic railgun space shuttle launching mechanism using electromagnetic force for an acceleration of the projectile. For launching the shuttle in space we are using full bridge rectifier circuit and capacitor bank, from capacitor bank the energy or force passes to the coil gun or rail gun to produces the magnetic force/flux which helps to the projectile launch in the space. In this project we are developing the antinuclear launcher for missile launcher and space shuttle launcher, this works on the Lorentz Force to accelerate a projectile. Due too many advantages and required less space and fuel of electromagnetic launcher, this project can be effectively implemented in Space Centre, Space Transportation System and carried cosmonaut and cargo to Earth orbit or in space.
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