Research on Methods of Decoupling Current and Friction in Electromagnetic Launching

Research on Methods of Decoupling Current and Friction in Electromagnetic Launching

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)

Electromagnetic rail launch is an effective way to achieve high velocity. Multiple physical fields such as electricity, magnetism, heat and force are coupled during the launching. The wear of the armature is mainly caused by the joule heat generated by current heating and the frictional heat. Electromagnetic force is mainly determined by the magnitude of the current, so joule heat and frictional heat are two factors that are difficult to separate. It means that the proportion of frictional heat and Joule heat to armature wear cannot be distinguished, which has a certain impact on armature design. The electromagnetic launch device includes simple type and augmented type. The inductance gradient of the simple device is about 0.45uH/m, and the inductance gradient of the augmented device is about 0.9uH/m. According to the electromagnetic force formula, it can be inferred that when the same current is passed through, the electromagnetic force acting on the armature in the two types of launchers differs by half. By controlling the magnitude of the current and the mass of the projectile, it is possible to achieve the same amount of electromagnetic force and the same speed curve on both devices, and obtain experimental comparative analysis of the same amount of friction force. Friction and current can be compared and analyzed by this method.