A Lumped Parameter Model and Its Code for Capacitor-Based Railgun With Arbitrary Number of PFUs

Zhang, Honghai; Guang-wei, Cheng; Guo, Wei; Su, Zizhou; Zhang, Tao

doi:10.1109/tps.2014.2333658

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…The total resistance of the rail is calculated using the ohmic loss calculation as in (10). However, DC resistance, as stated in (9), used to isolate R vse as in (11). Hence an empiric formulation was developed and used during the simulation.…”

Section: The Simulation Modelmentioning

confidence: 99%

“…For example, Zhang et al [10] states that for a given magnitude of flat rail current, the set of triggering time that ensures the desired rail current is unique and can be calculated iteratively. The proposed iterative algorithm is compared with GA-based solutions of TTOP, and the iterationbased method has preferable effects on calculating timing sequence [11].…”

Section: Introductionmentioning

confidence: 99%

“…The flatness of the rail current is obtained by an internal control algorithm, which reduced the optimization problem's complexity. Apart from other iterative-based solutions of TTOP in literature [10], [11], our model has an additional constraint on down-slope rail current, which reduces transition risks. Moreover, the study conducted with different capacitor voltage so that the vertex of the TTOP under given constraint is explained.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Tosun¹

2020

Preprint

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Section: The Simulation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Tosun¹

2020

Preprint

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Section: The Simulation Modelmentioning

confidence: 99%

Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Tosun

Polat

Kevsan

2020

2020 IEEE International Conference on Plasma Science (ICOPS)

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Electromagnetic launchers (EMLs) can provide accurate speed control of a projectile compared to gun-powder based alternatives. However large-caliber launchers have several pulse power supply (PPS) modules connected in parallel to reach the required current levels. Determination of the triggering instants of these parallel PPS modules is a crucial part of the launch mechanism. The triggering instants does not only affect the exit velocity but also the forces on the armature which can lead to transition i.e. separation of the armature from the rails. In this study, a triggering sequence optimization method that is faster than other alternatives in the literature and take into account speed-dependent parasitic masses and transition phenomena. Real-coded genetic algorithm (RCGA) and Partical Swarm Optimization (PSO) are used to create bencmarks. 32 capacitive PPS modules with 8 MJ total energy is used. With the achieved accuracy and speed, this study offer: An effective speed control algorithm with several physical constraints.

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“…al. stated that for a given magnitude of flat rail current, the set of triggering time is unique and can be calculated iteratively [8], [9]. We also used an iterative algorithm to evaluate the set of triggering times, considering the shape of rail current and muzzle velocity [10].…”

Section: Introductionmentioning

confidence: 99%

Bus Impact on the Inductance Distribution of Electromagnetic Launchers

Tosun¹,

Keysan²

2021

Preprint

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<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>

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A Lumped Parameter Model and Its Code for Capacitor-Based Railgun With Arbitrary Number of PFUs

Cited by 10 publications

References 14 publications

Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

Bus Impact on the Inductance Distribution of Electromagnetic Launchers

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