改进FDTD／集总源模型分析航天器场线耦合

摘要

Aiming at the typical problems of electromagnetic pulse influencing wires of the spacecraft, the spacecraft field/wire coupling analysis model was built. To calculate the electromagnetic field, the finite difference time domain method was improved. The average electrical parameters was adopted,and the obj ect edges was modified,which cannot match the Yee grids.To analyze the field/wire coupling, the multiconductor transmission line transient reponse model based on the lumped equivalent sources was proposed. The distributed voltage and current sources excited by the incident field were decoupled with the exponential multiconductor transmission lines matrix. The lumped equivalent voltage and current sources model were built. The model was used to analyze a wire in the launch vehicle which was influenced by the electromagnetic pulse.The analysis results show that the interference of the electromagnetic pulse to the wires can destroy the equipment,even though there is shield.%针对典型的电磁脉冲对航天器电缆耦合问题，建立了航天器场线耦合分析模型。在场分布计算方面，采用基于平均电参数和分析目标与 Yee网格不重合的边缘部分修正的改进时域有限差分法。在场线耦合方面，建立基于集总等效源模型的多导体传输线瞬态响应模型，将外场在传输线上激励的分布电压源和电流源与传输线指数矩阵解耦，建立了集总等效电压源和电流源模型。采用分析模型分析运载内一根电缆受电磁脉冲影响的响应，结果表明，即使存在屏蔽作用，电磁脉冲在电缆上耦合的干扰足以损毁设备。