Simulations on Elastoplasticity of the Monolithic Aluminum Armature Under the Contact Force

Li, Mintang; Yan, Ping; Yuan, Wu; Sun, Yaohong; Shao, Tao; Wang, Jue; Zhou, Yuan

doi:10.1109/tps.2010.2048127

Cited by 12 publications

(6 citation statements)

References 20 publications

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“…Considering the busbar material will produce unrecoverable deformation under excessive mechanical stress, it has elastoplasticity. The elastoplastic materials experience two stages during deformation: the elastic stage and the plastic stage [25], [26]. The elastic equation of the busbar material is shown in equation (14), and the plastic equation of the busbar material can be expressed by the Voce model [27]:…”

Section: Multiphysics Analysis Of the Busbar Under The Short-circuit Fault A Finite Element Simulationmentioning

confidence: 99%

An Improved Multiphysics Analysis Model for the Short-Circuit Fault Ride-Through Capability Evaluation of the MMC Submodule Busbar

et al. 2021

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The short-circuit fault is the severest fault that threatens the reliability of the modular multilevel converter (MMC) submodule busbar. When the short-circuit fault occurs, a huge overcurrent will flow through the busbar. Since the discharge time is very short and the discharge current is too large, the discharge current produces a strong skin effect on the busbar, resulting in overheating and deformation of the busbar, which may cause the permanent failure of the busbar. The busbar is the key component of the MMC submodule. It is therefore crucial to evaluate the fault ride-through capability of the MMC submodule busbar. The key feature of the short-circuit behavior of the busbar is that the large electromagnetic force is induced by the fault current, which causes the deformation of the busbar in a very short transient. The fast deformation of the conductor will generate the electromotive force induced current by the fast deformation of the conductor in a strong magnetic field. Plasticity of the conductor also significantly influences the deformation of the conductor. The existing researches on the failure mechanism of the busbar did not take these two important factors into account. This paper proposes an improved multiphysics analysis model which considers both the dynamic electromotive force and plasticity for analyzing the reliability of the MMC submodule busbar under the short-circuit fault. The fault current through the busbar is derived by numerical calculation. Utilizing the fault current as the input, an improved multiphysics analyzing model, which takes both features into account is proposed. Simulation results show that the dynamic electromagnetic force induced current and plasticity play dominant roles in the deformation of the busbar and are key factors that need to be taken into account in the short-circuit analysis of the busbar.INDEX TERMS Modular multilevel converter, submodule busbar, multiphysics analysis, short-circuit fault.

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Section: Multiphysics Analysis Of the Busbar Under The Short-circuit Fault A Finite Element Simulationmentioning

confidence: 99%

An Improved Multiphysics Analysis Model for the Short-Circuit Fault Ride-Through Capability Evaluation of the MMC Submodule Busbar

et al. 2021

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“…To the EMRDS with a square caliber, the two-dimensional (2-D) structural design of armature is convenient and practical [7][8][9][10]. Based on the mechanical analysis of 2-D models, seven kinds of armatures with different arm lengths are designed.…”

Section: Structural Design Of Series Of Armaturesmentioning

confidence: 99%

The effect of solid armature's arm length on its sliding performance

Wang

et al. 2011

2011 International Conference on Electrical Machines and Systems

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The sliding performance of solid armature is greatly influenced by its structural shape, especially by its arm length. A series of armatures with seven different arm lengths are designed, in this paper, and a small experimental system is built to execute the corresponding experiments. The evaluating method of the sliding performance is introduced, and the experimental results are analyzed by the signal collection curves and the rail condition after experiment. The experimental results show that though the apparent contact area of the long arm armature is bigger than the one of the short one, but the real contact area is not increased with the increment of arm length. At a certain size scope, the longer arm length, the lower sliding performance of solid armature. To the solid armature with good flexibility, its sliding performance can be advanced by properly increasing the initial contact force.

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“…C-shaped armature railguns rely on electromagnetic forces both to accelerate the armature and to Manuscript provide the magnetic pressure on the armature flanges during armature motion. These magnetic forces provide the sliding contact pressure required for continuous electrical conduction, and accounts for armature material loss throughout the length of the bore during a shot [7]. The formation and location of these electromagnetic forces is dependent on the location and density of current in the armature.…”

Section: Introduction and Identification Of Problemmentioning

confidence: 99%

Improving Start-Up Contact Distribution Between Railgun Armature and Rails

Hric

Odendaal

2016

IEEE Trans. Plasma Sci.

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Contact pressure between the armature and rails of a railgun is critical to rail lifetime, armature acceleration, and consistent shot behavior. A zero-velocity contact is provided by the mechanical strain of the armature flange in interference with the rails. The contacting surfaces of the armature typically have unpredictable, localized concentrations of contact pressure and areas with no contact pressure at all. A method to improve contact distribution and maintain control of the total contact force magnitude is introduced in this paper. This technique, called the predicted displacement method (PDM), showed promising results on simple model geometries and successfully demonstrated its ability to improve the design of a solid C-shaped railgun armature. The simulation results also illustrated the PDM's ability to scale contact force magnitude while preserving the improved pressure distribution.

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Simulations on Elastoplasticity of the Monolithic Aluminum Armature Under the Contact Force

Cited by 12 publications

References 20 publications

An Improved Multiphysics Analysis Model for the Short-Circuit Fault Ride-Through Capability Evaluation of the MMC Submodule Busbar

An Improved Multiphysics Analysis Model for the Short-Circuit Fault Ride-Through Capability Evaluation of the MMC Submodule Busbar

The effect of solid armature's arm length on its sliding performance

Improving Start-Up Contact Distribution Between Railgun Armature and Rails

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