scholarly journals Constraint Based Design of Multipole Field Electromagnetic Launcher using Gauss Method

2019 ◽  
Vol 8 (6S2) ◽  
pp. 907-911
Keyword(s):  
Iterative Method ◽  
Objective Function ◽  
Design Algorithm ◽  
Muzzle Velocity ◽  
Electromagnetic Launchers ◽  
The World ◽  
Electromagnetic Launcher ◽  
Gauss Method ◽  
Multipole Field ◽  
Electromagnetic Propulsion

Initiatives in electromagnetic propulsion all over the world are aimed at the development of electromagnetic launchers. This paper presents the constraint based design of Multipole Field Electromagnetic Launcher (MFEL). A design algorithm is developed based on Gauss iterative method. Muzzle velocity is considered as the objective function and the length, diameter and thickness of the accelerating coil are considered as constraints. The results for hexapole, octapole, decapole, dodecapole and hexadecapole cases are compared and tabulated.

scholarly journals Computations of Magnetic Forces in Multipole Field Electromagnetic Launcher

2019 ◽  
Vol 4 (3) ◽  
pp. 761-774 ◽  
Author(s):  
Srichandan Kondamudi ◽  
Mallikarjuna Rao Pasumarthi
Keyword(s):  
Finite Element Analysis ◽  
Flux Distribution ◽  
Element Analysis ◽  
Flux Lines ◽  
Magnetic Forces ◽  
Electromagnetic Launchers ◽  
Lorentz Equation ◽  
Electromagnetic Launcher ◽  
Multipole Field ◽  
Force Characteristics

Multipole Field Electromagnetic Launchers (MFEML) is one of the radial electromagnetic launching mechanisms, which can propel a payload for long distances. This paper proposes formulae for inductance based on the magnetic flux distribution in the coils of MFEML. Flux lines flow is sectionalized, for each section reluctance formulae is derived based on the position of the projectile. Based on the principles of the Lorentz equation, magnetic forces are calculated. This paper presents an electrical and magnetic equivalent circuit of MFEML. The velocity and force characteristics are obtained for the proposed formulae. The results are validated using Finite element analysis.

Design of armature with high muzzle velocity in the small caliber electromagnetic launcher

2014 ◽  
Vol 26 (4) ◽  
pp. 45040
Author(s):  
徐伟东 Xu Weidong ◽  
陈允 Chen Yun ◽  
袁伟群 Yuan Weiqun ◽  
赵莹 Zhao Ying ◽  
王咸斌 Wang Xianbin ◽  
...  
Keyword(s):  
Muzzle Velocity ◽  
Electromagnetic Launcher

Design of Pressure Vessel Cascades for Electromagnetic Launchers

1989 ◽  
Vol 111 (3) ◽  
pp. 326-331
Author(s):  
E. P. Fahrenthold
Keyword(s):  
High Energy ◽  
Pressure Vessels ◽  
Pulsed Power ◽  
Power Supplies ◽  
High Energy Density ◽  
Electromagnetic Launchers ◽  
Electromagnetic Launcher ◽  
Very High Energy ◽  
Very High

The relatively recent development of very high-energy density pulsed power supplies has motivated a renewed interest in the structural design of electromagnetic launchers. Cascade design electromagnetic launcher pressure vessels offer convenient maintenance access to high wear rate components of the structure while satisfying an unusual combination of electromagnetic, strength, and preloading constraints imposed on the system designer. Analysis for design of such structures focuses on the accurate characterization of fluid-structure interaction under dynamic asymmetric loading.

Multipole Field Electromagnetic Launcher

2010 ◽  
Vol 46 (7) ◽  
pp. 2622-2627 ◽  
Author(s):  
Yingwei Zhu ◽  
Yu Wang ◽  
Zhongming Yan ◽  
Liang Dong ◽  
Xiaofang Xie ◽  
...  
Keyword(s):  
Electromagnetic Launcher ◽  
Multipole Field

scholarly journals Bus Impact on the Inductance Distribution of Electromagnetic Launchers

2021 ◽  
Author(s):  
Nail Tosun ◽  
Ozan Keysan
Keyword(s):  
Simulation Models ◽  
Careful Examination ◽  
Physical Conditions ◽  
Electromagnetic Launchers ◽  
Electromagnetic Launcher ◽  
Bus Structure ◽  
Electromagnetic Calculations ◽  
Operation Risk ◽  
Current Transients ◽  
Good Agreement

<div>Simulations are crucial in the electromagnetic launcher (EML) researches on account of extreme physical conditions. More energy into the system adds weight to the model’s accuracy as the operation risk rises. In this paper, the electromagnetic impact of the bus structure is discovered in a recently developed EMFY-3 electromagnetic launcher, is presented. An H-shaped bus structure is used for current injection. However, experiments showed that the H-shaped bus changes inductance calculations. A careful examination is made to reveal the physical reasoning of the bus impact. We hypothesize that the rail portion surrounded with bus geometry has less inductance than the rest due to the eddy current created by rail current transients, which should be calculated carefully through numerical calculations, i.e., 3-D Finite Element Method (FEM). Two different simulation models were constructed to test the hypothesis. Moreover, rail currents, breech, and muzzle voltages are measured to investigate electromagnetic calculations. Results showed a good agreement with experiments where the bus structure was modeled explicitly. That aspect showed that the bus structure should be well-examined when multiple PPS are connected.</div>

scholarly journals Materials Selection in Electromagnetic Launcher Design

1989 ◽  
Vol 111 (3) ◽  
pp. 319-326 ◽  
Author(s):  
E. P. Fahrenthold
Keyword(s):  
Numerical Modeling ◽  
Composite Structure ◽  
Electrical Performance ◽  
Next Generation ◽  
Materials Selection ◽  
Electromagnetic Launchers ◽  
Electromagnetic Simulations ◽  
Laboratory Facilities ◽  
Electromagnetic Launcher ◽  
Alternative Designs

The design of electromagnetic launchers includes a large materials selection component, with the use of available structural materials constrained by electrical performance considerations. Feasible material combinations for the composite structure are limited, with mechanical and thermo-electromagnetic simulations required to compare the performance of alternative designs. Numerical modeling studies suggest that next generation devices constructed for laboratory facilities or vehicular mounting may differ markedly in material composition, yet offer similar and significant structural improvements over conventional railgun designs.

scholarly journals The interactions of rational, pragmatic agents lead to efficient language structure and use

2019 ◽  
Author(s):  
Benjamin Peloquin
Keyword(s):  
Objective Function ◽  
System Level ◽  
Language Structure ◽  
The World ◽  
Communicative Efficiency ◽  
The Moment ◽  
Syntactic Dependency ◽  
Word Frequencies ◽  
Do So ◽  
Func Tion

Despite their diversity, languages around the world share a consistent set of properties and distributional regularities. For example, the distribution of word frequencies, the distribution of syntactic dependency lengths, and the presence of ambigu- ity are all remarkably consistent across languages. We dis- cuss a framework for studying how these system-level proper- ties emerge from local, in-the-moment interactions of rational, pragmatic speakers and listeners. To do so, we derive a novel objective function for measuring the communicative efficiency of linguistic systems in terms of the interactions of speakers and listeners. We examine the behavior of this objective in a series of simulations focusing on the communicative func- tion of ambiguity in language. These simulations suggest that rational pragmatic agents will produce communicatively effi- cient systems and that interactions between such agents pro- vide a framework for examining efficient properties of lan- guage structure and use more broadly.

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