复杂线束在双BCI耦合下的终端响应机理

Terminal response mechanism of complex wire harness under double BCI coupling

高强度辐射场实验室环境下构建困难,应用双大电流注入(BCI)法替代辐照法进行抗扰度研究具有广阔的前景。针对当前双电流钳与线束耦合机理不清晰的问题,建立了双电流钳与线束耦合的精确解析模型。采用先分段后级联的方法对线束进行研究,首先在电流钳与线束的耦合区间建立π型等效电路模型,然后在电流钳与线束的非耦合区间基于传输线理论构建链路参数矩阵,最后将各区间级联为线束终端响应预测模型。基于有限积分法建立数值电磁仿真模型,比较解析模型与数值仿真模型对线束终端响应的预测结果,结果显示:二者对线束终端响应电压的求解结果有较好的一致性,MAPE为17%,进而验证了模型的有效性。应用模型分析电流钳与线束的相对位置对终端响应电压的影响,结果表明:低频段几乎无影响,超过100 MHz,线束终端响应电压的幅值与谐振点发生改变。

It is difficult to construct in a high-intensity radiation field laboratory environment,and the application of dual Bulk Current Injection(BCI)probe instead of irradiation methods for interference immunity research has broad prospects.Aimed at the current unclear coupling mechanism between dual bulk current injection probe and wire harnesses,accurate model of dual bulk current injection probe coupled with wire harness is established.Using the method of segmentation and then cascading,wire harness is studied.First,the equivalent circuit model is established in the coupling zone between the probe and the harness,and then the link parameter matrix is constructed based on the transmission line theory in the uncoupling zone.Finally,it could be cascaded into a wire harness terminal response prediction model.A numerical electromagnetic simulation model is established based on finite integration method,and the prediction results of the prediction model and the numerical simulation model for the wire harness terminal response are compared.The results show that the two have good agreement on the results of the wire harness terminal voltage,and MAPE is 17%,which further verifies the effectiveness of the model.Using the model to analyze the influence of the relative position of the harness and probe on the response voltage of the terminal,the results show that the relative position has no effect in the low frequency band,exceeding 100 MHz,and the amplitude and resonance point of the terminal voltage will change.