安装方式对航天用电磁继电器振动特性的影响

航天用电磁继电器“高可靠、宇航级”目标的实现,与提高其耐力学环境能力密切相关。本文基于有限元软件MSC．Patran／Nastran,通过对某航天用电磁继电器振动特性的仿真计算,完成了安装方式因素对继电器抗振性能的影响分析。     

基于有限元法的航天用电磁继电器的激振传递路径分析

航天用电磁继电器"高可靠、宇航级"目标的实现,与提高其耐力学环境能力密切相关。为深入研究继电器振动失效机理,进而得到影响其结构动力学特性的关键因素,本文应用商用有限元分析软件MSC.Patran/Nastran建立了某型号航天用电磁继电器的三维实体模型,确定了整机结构的主要模态,并通过谐响应得到了结构内关键零件的振动加速度响应,完成了继电器的激振传递路径分析。所得的结论对于航天用电磁继电器的抗振性设计具有重要的参考价值。     

Comparative study on the static and dynamic characteristics of four types of PMFCLs for large capacity applications

Permanent-Magnet-Biased Saturation Based Fault Current Limiter (PMFCL) may find early applications in high-voltage and large capacity power systems due to prominent advantages such as compactness, small size, reliable and safe operation, and zero reset time. The prevailing topologies and the operating principles of the PMFCLs are elucidated in the paper. Theoretical analysis on both the static and dynamic characteristics of different modes of PMFCLs is carried out comparatively, in which new concepts of effective magnetic flux density and magnetic field intensity are proposed to describe the overall impacts of the magnetic field on the current limiting capacity of the PMFCLs. Based on theoretical analysis and mathematical deduction, equivalent magnetic circuits and equations are established, which presents invaluable fundamentals for further study on the operating mechanism of different modes of PMFCLs as well as optimization of the fault current limiting topology design.