Test results for three prototype models of a linear induction launcher

Zabar, Z.; Lu, Xiaojun; He, Jiangen; Birenbaum, L.; Levi, E.; Kuznetsov, S.B.; Nahemow, M.D.

doi:10.1109/20.101094

Cited by 20 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In case (3), again the sleeve is absent, but all three phases have been fired at 60" intervals. Damping of the phase A current is seen to be quite strong; comparable, in fact, to that of case (2). Since the losses here evidentlv ex- …”

Section: Optimization Of the Traveling Wavementioning

confidence: 57%

See 1 more Smart Citation

Experimental results and performance analysis of a 500 m/sec linear induction launcher (LIL)

Zabar

Levi

et al. 1995

IEEE Trans. Magn.

Self Cite

View full text Add to dashboard Cite

A computer model, previously validated, was used to study the performance of an experimental 3-phase launcher energized by a capacitor bank and designed to impart to a 137-gram projectile a muzzle velocity of 500 m/s: (1) the build-up of the traveling wave was examined; (2) the connection of the drive coils was changed; (3) the resistances of the drive circuits were calculated and measured; (4) the effect of the conductivity of the cylindrical tube (sleeve) constituting the projectile was assessed.Experimentally, a doubling of the muzzle velocity was achieved, from an earlier-obtained 250 m/s, to its present 476 m/s. This was done by strengthening the thin-walled aluminum sleeve by heat-treatment (aging) to prevent it from being crushed when the input energy was raised to its design value.

show abstract

Section: Optimization Of the Traveling Wavementioning

confidence: 57%

“…The highest frequency is in case (2). The lowest frequency is in case (3), and the frequencies for cases (1) and (4) are almost equal.…”

Section: Effect Of Mutual Inductance Between Adjacent Drive Coilsmentioning

confidence: 67%

Experimental results and performance analysis of a 500 m/sec linear induction launcher (LIL)

Zabar

Levi

et al. 1995

IEEE Trans. Magn.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The traveling wave analysis created with this structure is quite complex. When developing the power stage, initiating the process with a simplified model would be a more practical approach [11].…”

Section: System Designmentioning

confidence: 99%

Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Dogangunes,

Balikci

2024

Energies

View full text Add to dashboard Cite

Linear induction launchers (LILs) are a specific subtype of linear motors. However, LILs are air-core machines that consistently operate in a transient rather than a steady state. Moreover, their operating currents and voltages exceed those of traditional machines. The execution time of LILs often remains within a few milliseconds, and it is essential to manage extremely high-power levels quickly. The control methods for LILs differ from those used for regular machines due to the differences from conventional linear motors. In this respect, there are still challenges to be overcome in power systems designed for LILs in the literature. This study has developed a novel power energization system to address these challenges, particularly in terms of inadequate V/f control and the unnecessary energization of regions along the barrel where no projectile is present. It focuses on the system’s design using multi-stage H-bridge inverters to produce a sinusoidal current for section-by-section polyphase excitation. An FPGA-based electronics control system generates bipolar PWM fiber-optical signals for IGBT switches for scalar V/f control of the inverters. Distributed multi-inverters power each stage of the launcher’s barrel and are controlled by the FPGA to create the travelling electromagnetic wave package. Three-dimensional FEM analysis is used for observation of the trigger timing to ensure positive force along the barrel. By driving each inverter independently, the coils on the barrel are excited sequentially based on the position of the projectile. This study also explains the implementation of a laboratory-scale barrel prototype, a 40 mm aluminum projectile, its power electronics, and the control part of the multi-stage inverters. In this study, 3300 V–1200 A IGBTs and 8.8 mF–2000 V DC-Link capacitors were used in the H-bridge inverter modules. Experimental studies have been conducted on the launcher, and the results obtained, including achieving a velocity of 30 m/s, are consistent with the electromagnetic simulations. It has been observed that the launcher, powered by the proposed system, is approximately 57.14% more efficient compared to the version energized by a single inverter.

show abstract

“…Finally, the lumped parameter model can be summed up as the initial value problem of the nonlinear variable coefficient ordinary differential equation. e primary notations used in this paper are listed in Table 1 [15][16][17][18][19][20].…”

Section: Principle and Modeling Of Electromagnetic Ejectionmentioning

confidence: 99%

Research on Vehicle-Mounted Electromagnetic Ejection Remote Fire Extinguishing System

Wang

Shi

et al. 2022

Mathematical Problems in Engineering

View full text Add to dashboard Cite

This article first introduces the characteristics and disadvantages of traditional remote fire extinguishing technology and proposes a remote fire extinguishing system based on electromagnetic ejection. Based on the finite element analysis method and the grid matrix method, a seven-segment electromagnetic launcher model is designed. As the initial energy source, the capacitor can accelerate a 10 kg fire extinguishing bomb to 113 m/s with a range of 2 km. The results show that the electromagnetic catapult designed in this study can meet the needs of fire extinguishing bombs. This paper also designs the overall structure of the vehicle electromagnetic catapult remote fire extinguishing system, discusses its role in the field of firefighting, and prospects the future work.

show abstract

Test results for three prototype models of a linear induction launcher

Cited by 20 publications

References 7 publications

Experimental results and performance analysis of a 500 m/sec linear induction launcher (LIL)

Experimental results and performance analysis of a 500 m/sec linear induction launcher (LIL)

Design and Implementation of a Linear Induction Launcher with a New Excitation System Utilizing Multi-Stage Inverters

Research on Vehicle-Mounted Electromagnetic Ejection Remote Fire Extinguishing System

Contact Info

Product

Resources

About