Muzzle velocity estimation of an electromagnetic launcher using B-dot probe

2019 ◽  
Vol 61 (4) ◽  
pp. 563-580 ◽  
Author(s):  
Hong-Kyo Kim ◽  
Beom-Soo Kang ◽  
Jeong Kim
Keyword(s):  
Velocity Estimation ◽  
Dot Probe ◽  
Muzzle Velocity ◽  
Electromagnetic Launcher

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

scholarly journals Muzzle Voltage Characteristics of Railguns

2021 ◽  
Author(s):  
Nail Tosun ◽  
Ozan Keysan
Keyword(s):  
Finite Element Method ◽  
Mutual Inductance ◽  
Experimental Measurements ◽  
Current Ratio ◽  
Muzzle Velocity ◽  
Action Integral ◽  
Transition Mechanism ◽  
Electromagnetic Launcher ◽  
Simulation Results ◽  
Resistance Modeling

Muzzle voltage is an essential diagnostic tool used in both contact resistance modeling and transition determination. However, it is challenging to stem the necessary meanings from the collected measurements. In this study, EMFY-3 launch experiments are used to model muzzle voltage characteristics to understand the transition mechanism better. These experiments have muzzle energies in the range between 1.69-2.85 MJ in ASELSAN Electromagnetic Launcher Laboratory. Six different launch tests with various rail current waveforms that ranged between 1.5-2.1 MA are used to investigate different scenarios. Some parameters which affect muzzle voltage are calculated with the 3-D Finite Element Method (FEM), i.e., rail mutual inductance $\mathrm{L_m}$. Muzzle voltages are decomposed into subsections; each subsection is calculated with proper models. Simulation results are coherent with experimental measurements. Findings are compared with previous studies, and differences are explained with possible reasons. Even though we could not conclusively resolve which physical quantity starts to transition, the study showed that transition does not form a specific muzzle velocity, armature action integral, or down-slope rail current ratio.

scholarly journals Muzzle Voltage Characteristics of Railguns

2021 ◽  
Author(s):  
Nail Tosun ◽  
Ozan Keysan
Keyword(s):  
Finite Element Method ◽  
Mutual Inductance ◽  
Experimental Measurements ◽  
Current Ratio ◽  
Muzzle Velocity ◽  
Action Integral ◽  
Transition Mechanism ◽  
Electromagnetic Launcher ◽  
Simulation Results ◽  
Resistance Modeling

Muzzle voltage is an essential diagnostic tool used in both contact resistance modeling and transition determination. However, it is challenging to stem the necessary meanings from the collected measurements. In this study, EMFY-3 launch experiments are used to model muzzle voltage characteristics to understand the transition mechanism better. These experiments have muzzle energies in the range between 1.69-2.85 MJ in ASELSAN Electromagnetic Launcher Laboratory. Six different launch tests with various rail current waveforms that ranged between 1.5-2.1 MA are used to investigate different scenarios. Some parameters which affect muzzle voltage are calculated with the 3-D Finite Element Method (FEM), i.e., rail mutual inductance $\mathrm{L_m}$. Muzzle voltages are decomposed into subsections; each subsection is calculated with proper models. Simulation results are coherent with experimental measurements. Findings are compared with previous studies, and differences are explained with possible reasons. Even though we could not conclusively resolve which physical quantity starts to transition, the study showed that transition does not form a specific muzzle velocity, armature action integral, or down-slope rail current ratio.

Measurement of the Armature Speed in Electromagnetic Launching Process Using B-Dot Probes

2014 ◽  
Vol 701-702 ◽  
pp. 514-517
Author(s):  
Yu Li ◽  
Xin Lin Long ◽  
Jun Yong Lu
Keyword(s):  
High Speed ◽  
Data Fitting ◽  
High Speed Camera ◽  
Dot Probe ◽  
Measurement Result ◽  
Muzzle Velocity

In this paper, the sensing principle of a B-dot probe to measure the armature position was analyzed. The output waveforms of the probe for two different orientations were given after mathematical deduction. An electromagnetic launching experiment was conducted, and the result shows that the output waveforms of the probes can present the velocity trend of the armature. After data fitting, the velocity of the armature moving in the bore was given, and combined with the waveform of the muzzle voltage, the muzzle velocity was obtained, which matched the measurement result by a high speed camera well.

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.

3D Scan Matching using Linear Velocity Estimation for Forest Road Localization

2020 ◽  
Vol 140 (9) ◽  
pp. 1082-1090
Author(s):  
Hiroyuki Nakagomi ◽  
Yoshihiro Fuse ◽  
Yasuki Nagata ◽  
Hironaga Miyamoto ◽  
Masashi Yokotsuka ◽  
...  
Keyword(s):  
Linear Velocity ◽  
Velocity Estimation ◽  
Scan Matching ◽  
Forest Road ◽  
3D Scan
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