Optimization of reluctance accelerator efficiency by an improved discharging circuit

Deng, Huimin; Wang, Yu; Lu, Falong; Yan, Zhongming

doi:10.1016/j.dt.2019.08.013

Cited by 19 publications

(15 citation statements)

References 14 publications

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“…Reluctance coil gun (RCG) is a device that spits projectiles of ferromagnetic materials out of the barrel by electromagnetic force [1]. Compared with other types of electromagnetic launchers, RCGs have the following advantages: 1) the armature does not need to be power fed, which is suitable for harsh working environment; 2) the armature can be magnetically suspended in the launch tube to accelerate [2], [3], so it is not easy to be damaged by friction; 3) small induction eddy current on the armature [4], [5], not easy to heat up; 4) it is easy to realize small size and lightweight design; 5) the driving current is low [6], the components are small and low cost [1], and high safety of launch. Therefore, the RCG is easier to realize portable design.…”

Section: Introductionmentioning

confidence: 99%

Specified Velocity Launching of Reluctance Coil Gun Based on Genetic Algorithm

Zhang

2024

IEEE Access

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In this study, a method is proposed to obtain the initial voltage of the capacitor and the initial relative position of the projectile of a reluctance coil gun using a genetic algorithm to make the projectile launch at a specified muzzle velocity with high efficiency. Firstly, the equivalent inductance change during the launching process is used as a link for multi-physics field analysis, and a set of electromagnetic dynamics equations is derived to correct the effect of magnetic saturation on the inductance according to the current value in the coil. Further the set of equations is constructed as a Simulink discretized numerical computational program and called by a genetic algorithm written in MATLAB to approximate the optimal solution by generation-by-generation optimization. When the specified projectile muzzle velocity is set to 10 m/s, the initial voltage of the capacitor calculated using the genetic algorithm is 156 V, and the initial position of the projectile is −14.3 mm. We input the parameters into the finite element analysis model and the launch experiment platform, and the obtained projectile muzzle velocity is 9.67 m/s and 9.8 m/s respectively, and the efficiency is close to the optimal value, also the comparison of voltage and current waveforms also shows that the method proposed in this study is effective.INDEX TERMS reluctance coil gun, equivalent inductance, genetic algorithm, specified muzzle velocity, launching efficiency.

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Section: Introductionmentioning

confidence: 99%

Specified Velocity Launching of Reluctance Coil Gun Based on Genetic Algorithm

Zhang

2024

IEEE Access

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“…In other words, the electromagnetic force on the armature changes into resistance force and reduces energy efficiency. Therefore, the method to improve the performance of coil launchers is necessary to restrain the effect of reverse force [6]. However, in past decades, the research on the speed and efficiency of reluctance coil launcher has mainly focused on the optimization of coil structure parameters, armature parameters design, trigger time controlling and etc [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Reverse Force Suppression Method of Reluctance Coil Launcher Based on Consumption Resistor

et al. 2021

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When armature passes through the central plane of a driving coil in the process of reluctance coil launching, the magnetic force will reverse and slow down the armature speed. To overcome this problem, the principle of reluctance coil launcher is analyzed. Meanwhile, this paper establishes a finite element analysis model to calculate the electromagnetic force, velocity, displacement and other parameters of the armature while the reluctance coil launcher works. Based on the simulation results, dynamic characteristics of the reluctance coil launcher are summarized and two methods for reverse force suppression are discussed. Furthermore, an experiment system is established and some experiments are carried out. This research concludes that resistor consumption method can effectively restrain the generation of reverse force, with no obvious bad impact on other performance, which provides a practical approach to achieving higher speed and efficiency for reluctance electromagnetic launcher.

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“…Experiments showed that the launching mass and energy can be extended, but the speed remained low. Research [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] has shown results of simulations and related experiments aimed at increasing launching velocity and energy (Fig. 1).…”

mentioning

confidence: 99%

“…Rivas-Camacho et al 25 presented coilgun with an inductive power source reaching 8.96 m/s. Deng et al 29,34 showed 30 J record launching energy of coilgun by extending the projectile mass, shortening the electrical pulse, and optimizing the projectile material and shape. Akay et al 30 demonstrated a 17.1 m/s.…”

mentioning

confidence: 99%

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A multi-stage 130 m/s reluctance linear electromagnetic launcher

Einat

Orbach

2023

Sci Rep

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Moon launching capabilities are vital for space program development. Especially important is the capability to launch without fuels or disposable elements since bringing supplies to the moon is complicated and expensive. An electric system would have the benefit of using solar or nuclear-based unlimited electrical energy. In this paper, such an electrical launching system is suggested—a reluctance coilgun launcher with multi acceleration stages. It has the benefit of simplicity and longer lifetime compared to other electrical launchers. In this paper, a successful implementation of a multi-stage reluctance launcher is presented that reaches the highest reported launching speeds from a reluctance coilgun. Moreover, a method to successfully add more and more stages is presented. Based on this method, an electrical launcher to be used for launching from the moon can be designed.

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Optimization of reluctance accelerator efficiency by an improved discharging circuit

Cited by 19 publications

References 14 publications

Specified Velocity Launching of Reluctance Coil Gun Based on Genetic Algorithm

Specified Velocity Launching of Reluctance Coil Gun Based on Genetic Algorithm

Reverse Force Suppression Method of Reluctance Coil Launcher Based on Consumption Resistor

A multi-stage 130 m/s reluctance linear electromagnetic launcher

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