Research on Insulation Problems Under Multishot Experiments in Electromagnetic Rail Launcher

Xu, Runsheng; Li, Dan; Zhao, Weikang; Xu, Weidong; Yuan, Wu; Yan, Ping

doi:10.1109/tps.2017.2705219

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…However, complete separation is not permissible during launch, as it would result in the deposition of rail materials in the gap between the rails and insulators. This deposition can cause rail corrosion and ultimately lead to structural failure [ 35 ]. The electromagnetic load is usually fixed in a railgun system.…”

Section: Resultsmentioning

confidence: 99%

“…However, most of these studies have focused on the interactions between the armature and rails, neglecting the significant interaction between the insulators and rails by assuming that they are bonded perfectly [ 34 ]. This oversight can impact the integrity of the railguns and potentially lead to issues such as aluminum from the armature melting and depositing onto the insulator, causing rail corrosion [ 35 ]. Additionally, it is worth noting that previous studies on pre-stressed barrels have not presented the mechanisms through which pre-stress influences railguns.…”

Section: Introductionmentioning

confidence: 99%

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Factors Influencing the Expansion of Arch-Shaped Electromagnetic Railguns with Pre-Stressed Composite Barrels

et al. 2023

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Rail expansion significantly impacts the launch precision of a railgun system. Higher precision can be achieved when the extent of expansion is low. This paper investigates three main factors that influence the extent of rail expansion using the finite element method, including pre-stress, electromagnetic load, and stiffness of the insulators. The mean squared error between experiment results and simulating results is less than 0.06, validating the finite element model. The simulated results reveal that the extent of rail expansion increases with a decrease in pre-stress and an increase in electromagnetic pressure and the stiffness of the insulator is the most significant influencing factor, as the use of a stiff insulator not only results in a small extent of rail expansion but also delays the separation between the rails and insulators. The mechanism of how pre-stress influences the railgun system has been proposed. It has been expressed that the pre-stress maintains the integrity of the railgun system by hindering the process of a decrease in the contact surface area between rails and insulators during launch. The study provides a platform to improve the design of the railgun system.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Factors Influencing the Expansion of Arch-Shaped Electromagnetic Railguns with Pre-Stressed Composite Barrels

et al. 2023

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“…Watt [13] pointed out that G10 insulator suffered large-scale surface damage from interaction with the projectile and had to be replaced after three or four shots. Xu [14,15] found that G10 insulator was prone to pits under mechanical shock, and the mechanical damage was the most serious at the current peak and initial decline stage. Scholars from the University of Texas at Austin [16,17] found that the insulator in the muzzle area delaminated after several tests, which became the starting point of failure and expanded in subsequent launches.…”

Section: Introductionmentioning

confidence: 99%

Delamination failure analysis of G10 insulator in electromagnetic rail launcher

Liu

Tan

et al. 2023

High Voltage

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The electromagnetic (EM) rail launcher G10 insulator is prone to delamination damage during launch, which affects the service life of the insulator. Through the secondary development of ABAQUS® commercial finite‐element software, an EM‐structure coupling launch dynamics model considering projectile‐barrel coupling is established. The simulation indicates that the transverse swing of the projectile changes in a sine‐like law, and the time of the upper half wave corresponds to the pulse width of the impact force pulse waveform. The stress concentration occurs on the inner surface of the insulator where the contact‐impact occurs, resulting in impact damage. The midline of the insulator inner surface bears a large compressive strain under the action of pre‐tightening force, and the insulator is compressed oscillatingly under the influence of the time‐varying load of the rail during launch. Under the condition of repeated launch, the launch package repeatedly impacts the insulator, and the alternating load of the rail is cyclically loaded on the insulator with impact damage, which will cause the compression fatigue of the insulator and the expansion of impact damage crack. They are the main reasons for the delamination failure of insulator, and the experimental analysis is carried out. This study provides a method to study the delamination failure mechanism of the insulator, and provides guidance for improving the life of the insulator.

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“…Wetz et al tried to control bore ablation by using magnetic augmentation, synchronously driven distributed power supply, high-purity alumina insulators, and pre-acceleration [12]. Xu et al measured surface resistivity and surface flashover voltage under different ablation areas [13]. Zhang et al analyzed the causes of the transition ablation, proposed corresponding improvement measures and verified them through experiments [14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

et al. 2020

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A high-efficiency thermal management system is one of the key points in the practical application of electromagnetic rail launcher (ERL). In this paper, the thermal characteristics in ERL with the section of rectangle, convex, and concave rails by active cooling under different friction coefficient condition are investigated. By two cooling approaches, at two launch rates, with four friction coefficients, peak temperature in convex rails at the same moment is minimum in three types rails. Joule heat dominates in three shapes rail by channel or surface/channel cooling approach, but friction heat is a nonnegligible part under multiple launching mode. The spatial and temporal distribution features of peak temperature of three shapes rail with different friction coefficient under active cooling condition are compared. The mathematical relations between friction coefficient, time and temperature rising caused by friction at pulse end time and shot end moment in ERL with the three types rail are obtained, respectively. In terms of obtaining lower maximal temperature in rail, the ERL with convex rails is the best one. INDEX TERMS Thermal analysis, electromagnetic rail launcher, friction heat, active cooling.

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Research on Insulation Problems Under Multishot Experiments in Electromagnetic Rail Launcher

Cited by 11 publications

References 9 publications

Factors Influencing the Expansion of Arch-Shaped Electromagnetic Railguns with Pre-Stressed Composite Barrels

Factors Influencing the Expansion of Arch-Shaped Electromagnetic Railguns with Pre-Stressed Composite Barrels

Delamination failure analysis of G10 insulator in electromagnetic rail launcher

Thermal Analysis in Electromagnetic Rail Launcher Taking Friction Heat into Account Under Active Cooling Condition

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