邻近效应对钢板阻抗的影响及其等效电路模型

为预测舰船系统的电磁兼容性和定量分析系统的共模干扰,研究了舰船接系统的阻抗特性。针对钢板2点之间阻抗特性与外部线路之间的关系,分析邻近效应对钢板阻抗的影响机理,建立了系统之间共地耦合干扰的三阻抗等效电路模型,采用四端连接方法测量了2个共地系统之间的耦合阻抗。分析表明,在强邻近效应情况下磁场耦合不仅产生等效互感而且产生等效互电阻,实验测试表明邻近效应使钢板电阻在1 MHz时比无邻近效应时大17倍。采用平面钢板简化模型和有限元计算方法分析钢板的耦合电阻,与实测数据的误差小于17%,验证了等效电路模型的正确性。

Mechanism and model of steel plane impedance influenced by proximity

The impedance characteristics of a steel plane ground were analyzed to model the electromagnetic compatibility and the common-model electromagnetic interference between the electronics and the electric system on ships.The mechanism of the proximity effect on the steel impedance was analyzed with circuit theory relating the steel plane impedance and the exterior circuit in an equivalent circuit model with three impedances.The mutual resistances between the two common ground circuits were measured using the four terminal connected methods.For strong proximity effects,the analyses indicate that magnetic field coupling not only produces a mutual inductance but also an equivalent mutual resistance.The experiment measurements show that the steel resistance is 17 times larger at 1 MHz.The coupling resistance of the steel plane was calculated using FEM,with relative errors between the calculation and the measurements of about 17%.