Optimization of Electrodynamic Energy Transfer in Coilguns With Multiple, Uncoupled Stages

Polzin, Kurt A.; Adwar, J. E.; Hallock, Ashley K.

doi:10.1109/tmag.2012.2230271

Cited by 16 publications

(10 citation statements)

References 20 publications

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“…Therefore, the propulsion force of the airplane is directed along the longitudinal axis of the x b plane of symmetry, and its value is described by the function N b . (6) In the model, it was assumed that the axis of O b x b rotation of the engine coincides with the axis of of the system, associated with the body of the aircraft, therefore the moment from the propulsive force is zero.…”

Section: Propulsion / Propulzijamentioning

confidence: 99%

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Modelling of Forces Acting on a System of the UAV Launcher, Based on Passive Magnetic Suspensions with Superconductors

2020

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Modern sea operations used for exploration and reconnaissance purposes are becoming more and more dependent on unmanned air vehicles (UAV). With the development of an increasing number of UAVs directed to the needs of the navy, various takeoff and landing systems are being tested. An alternative to the traditionally used catapults is magnetic catapults, which enable continuous power control, properly increasing the acceleration of the starting machine and at the same time enabling full automation of the launching process. The paper presents the developed of the physical model and theoretical analyzes the forces and torques acting on the launcher system using passive magnetic suspensions with high-temperature superconductors. The launcher was modeled as a configuration of three elements: tracks built from neodymium magnets generating the magnetic field, a starting cart driven by a linear engine and a UAV taking off or landing on the launcher cart. The set of assumptions regarding the characteristics of the environment, the structure of the system elements, kinematic constraints were made. The article consists also the theoretical analysis of external interactions having a decisive influence on the dynamics of the system. The analysis considers the couplings resulting from mutual interactions of individual elements of the system. Theoretical considerations were supplemented with a comparative analysis of numerical and experimental studies of the UAV launch process from the launcher which allowed the verification of the key parameters of the analyzed forces. Sažetak Moderne pomorske operacije korištene za eksploataciju i izviđanje na moru postaju sve više ovisne o vozilima bez posade (UAV). Razvojem povećanoga broja UAV-a, koji su usmjereni na potrebe mornarice, testiraju se različiti sustavi polijetanja i slijetanja. Alternativa tradicionalno upotrijebljenim katapultima magnetski je katapult, koji omogućava neprekidnu kontrolu snage, pravilno povećavajući akceleraciju početnoga stroja i istodobno omogućuje potpunu automatizaciju procesa lansiranja. Članak predstavlja razvoj fizičkoga modela i teoretski analizira sile i zakretne momente koji djeluju na sustav lansiranja koristeći pasivnu magnetsku suspenziju sa superprovodnicima visoke temperature. Lanser je modeliran kao konfiguracija triju elemenata: trake napravljene od neodimium magneta koji proizvodi magnetsko polje, početnih kola koja pokreće linearni stroj te UAV-a koji polijeće ili slijeće na lansirna kola. Postavljen je set pretpostavki koje se tiču karakteristika okoliša, struktura sustava elemenata i kinematskih ograničenja. Članak se također sastoji od teoretske analize i eksternih interakcija, koje imaju odlučujući utjecaj na dinamiku sustava. Analiza razmatra parove koji rezultiraju iz uzajamnih interakcija individualnih elemenata sustava. Teoretska razmatranja nadopunjena su komparativnom analizom numeričkih i eksperimentalnih studija procesa lansiranja UAV-a s lansera koji je dopustio verifikaciju ključnih parametara analiziranih sila. KEY WORDS phys...

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Section: Propulsion / Propulzijamentioning

confidence: 99%

“…An alternative design of an electromagnetic launcher with the acronym EMCAT (Electromagnetic Catapult) is being implemented in Great Britain [1], and analogous research is conducted in China and Russia. The NASA space agency [6] plans to use electromagnetic launchers to launch spacecraft and hypersonic aircraft.…”

Section: Introduction / Uvodmentioning

confidence: 99%

Modelling of Forces Acting on a System of the UAV Launcher, Based on Passive Magnetic Suspensions with Superconductors

2020

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“…The magnetic flux is created by the coil and is the only one which induces current in projectile, providing simultaneously the radial magnetic field on induced current [4][5][6].…”

Section: Fig 2 Induction Coilgunmentioning

confidence: 99%

A Theoretical Approach of a New Electromagnetic Launch System

Gherman¹,

Pearsică²,

Strimbu³

et al. 2016

Review of the Air Force Academy

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“…Furthermore, in a multi-stage acceleration system, the analytic solution is nearly impossible to get since the neighboring coils interact with the projectile in a complicated way. For this reason, analysis of multi-stage EIL is conducted by using a special code or commercial software based on the FEA method in many studies [11][12][13]. In this study, we designed a threestage EIL system by using electromagnetic analysis software (Maxwell 2D, Ansys Electromagnetics Suite 16.2) based on the FEA method.…”

Section: Axial Force Analysismentioning

confidence: 99%

Modeling of 3-stage Electromagnetic Induction Launcher

Kwak¹,

Kim²,

Kim³

et al. 2015

Journal of Magnetics

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Electromagnetic Induction Launchers (EIL) have been receiving great attention due to their advantages of noncontact between the coils and a projectile. This paper describes the modeling and design of 3-stage EIL to accelerate a copper projectile of 50 kg with 290 mm diameter. Our EIL consists of three independent driving coils and pulsed power modules to generate separate driving currents. To find efficient acceleration conditions, the appropriate shape of the driving coils and the position of the projectile have been calculated by using a finite element analysis (FEA) method. The results showed that the projectile can be accelerated more effectively as the gap between the coils is smaller; a final velocity of 45 m/s was obtained. The acceleration efficiency was estimated to be 23.4% when a total electrical energy of 216 kJ was discharged.

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Optimization of Electrodynamic Energy Transfer in Coilguns With Multiple, Uncoupled Stages

Cited by 16 publications

References 20 publications

Modelling of Forces Acting on a System of the UAV Launcher, Based on Passive Magnetic Suspensions with Superconductors

Modelling of Forces Acting on a System of the UAV Launcher, Based on Passive Magnetic Suspensions with Superconductors

A Theoretical Approach of a New Electromagnetic Launch System

Modeling of 3-stage Electromagnetic Induction Launcher

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