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

Chen, Liang; Xiang, Hongjun; Yuan, Xichao; Qiao, Zhiming; Lv, Qing-ao

doi:10.1109/access.2021.3073905

Cited by 12 publications

(6 citation statements)

References 11 publications

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“…The analysis of the reluctance launchers is complicated and difficult due to the non-linear B-H characteristics of the ferromagnetic projectile used in the reluctance launchers. Therefore, in the investigation of reluctance launchers, a software that uses finite elements analysis is utilized [14,16,17,20,21,[24][25][26][28][29][30][31][32].…”

Section: Methodsmentioning

confidence: 99%

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Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

Sari

2023

IEEE Access

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In this study, it is aimed to increase the projectile velocity by changing some parameters of the reluctance launcher. Studied parameters are the initial position of the projectile, the coating of the coil with ferrite, the coil length and the barrel outer diameter. A 3D Maxwell model of the reluctance launcher was generated to examine the effect of the change of these parameters on the projectile velocity. After the 3D model of the launcher was generated, analysis was done for each parameter. During the analysis for a parameter, the other parameters were kept constant. As a result of the analysis of the projectile position, it was determined that the projectile velocity is the highest when the projectile position is -2. It has been determined that the velocity of the projectile increases if the coil is coated with ferrite. It has been determined that the projectile velocity is the highest when the coil length is 7 cm. It has been determined that the highest projectile velocity is obtained when the barrel outer diameter is 18 mm. Using these results, the Maxwell model of the improved launcher was generated. The projectile velocity in the Maxwell model of the initial launcher is 19.24 m/sec. The projectile velocity of the improved launcher in the Maxwell model is 25.8 m/sec. By improving the launcher, a velocity increase of 34.09% was achieved. Later, this launcher was built and the parameters were investigated experimentally. In the experimental work, the projectile velocity of the initial launcher was measured as 19.11 m/sec, and the projectile velocity of the improved launcher was measured as 24.9 m/sec. As a result of the experimental work, a velocity increase of 30.29% was obtained by improving the launcher.

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Section: Methodsmentioning

confidence: 99%

“…The energy on the coil must be immediately dampened. A capacitor was used in a previous study [14] for dampening the coil energy where a resistance was used in another study [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

Sari

2023

IEEE Access

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“…The structure of RCG is the same as column core inductor, and suffers from magnetic saturation problem [10]. Due to the movement of the core, the equivalent inductance is not only related to the current value in the coil, but also related to the position of the core, thus the electromagnetic launching process has strong nonlinear characteristics [11], [12], which leads to a very difficult theoretical analysis and numerical calculation [13], [14]. At present, the muzzle velocity of RCG basically relies on the finite element method (FEM) for analysis, which has the problems of long calculation time and poor flexibility of the algorithm [15].…”

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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“…According to the working principle of solenoid actuators, the direction of the electromagnetic force on the projectile always points to the center of the coil. Therefore, when the projectile reaches the center of the coil, reducing the current in the driving coil can inhibit the reverse electromagnetic force, which is a very important method to improve the launching performance of RCGs [1,5]. Therefore, it is meaningful to calculate the position curve of the projectile and estimate the time when it reaches the center of the coil.…”

Section: Introductionmentioning

confidence: 99%

“…In order to form a large force or a high speed on the iron core for a very short time (several milliseconds), a high peak pulse current is applied to the coil instead of the periodic steady state of direct current or alternating current. However, the use of pulsed current introduces the problem of unsteady magnetic saturation [1], which makes analytical calculation difficult. Therefore, the electromagnetic analysis is usually done with the finite element method (FEM), which has the problem of time‐consuming and inflexible [2].…”

Section: Introductionmentioning

confidence: 99%

Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

Mengkun,

Junhong,

Xianglie

et al. 2023

IEEJ Transactions Elec Engng

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The structure of the reluctance electromagnetic launcher (REML) is equivalent to an inductor with a movable iron core. The dynamic current in the launching process is easy to be measured by instruments, but the data such as the position, velocity of the projectile and the equivalent inductance are not only difficult to solve by analytical methods, but also difficult to measure by instruments, which seriously hinders the development of the control technology. To solve this problem, referring to the method of introducing the inductance matrix into the motor algorithm model to realize semi-analytic calculation, a special algorithm model is proposed to calculate the launch process data of REML based on the current data. According to the working characteristics of the reluctance coil transmitter, it is pointed out that its inductance matrix should be specifically expressed as a three-dimensional data table rather than a traditional two-dimensional table. The current can be obtained by closed-loop calculation according to the proposed algorithm block diagram when the circuit parameters are known, or measured by instruments when the circuit parameters are unknown, and then the launch process data is obtained indirectly through calculation. In this study, an experimental platform was built, and the algorithm model was established using MATLAB/Simulink. The comparison of the dynamic launch process data of the finite element method (FEM) showed that the method was feasible.

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

Cited by 12 publications

References 11 publications

Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

Specified Velocity Launching of Reluctance Coil Gun Based on Genetic Algorithm

Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

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