A Numerical Model of Magneto-Electro-Thermo-Mechanical Characteristics at the Armature-Rail Contact Interface

A Numerical Model of Magneto-Electro-Thermo-Mechanical Characteristics at the Armature-Rail Contact Interface

연구 분야: Infrastructure

학회: 2024 10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on Electromagnetic Launch Technology (EAPPC/BEAMS/EML)

The movement of the armature during the launch process of the electromagnetic railgun is a type of high-speed sliding electrical contact. The characteristics inside the barrel cannot be measured directly. In this paper, a better prediction numerical model is developed. The model involves mechanical calculation part into previous electromagnetic thermal coupling relationships. Based on the contact pressure between the armature and rail obtained from the mechanical calculation part, as well as the rough surface characteristics, the influence of contact resistance on electromagnetic and temperature distribution is also considered. Finite difference formats of bilinear interpolation characteristic method and exponential high-order compact alternating direction implicit method are used to solve the electromagnetic field distribution and temperature field distribution respectively. Finite element incremental superposition method based on the Updated Lagrangian description is used to solve the stress distribution. The contact interface characteristics of rectangular armature and C-shaped armature without considering contact resistance and considering contact resistance are calculated. Results show that the electromagnetic distribution characteristics of C-shaped armatures are significantly better than those of rectangular armatures.