基于时域BLT方程的带绝缘线缆束场-线耦合模型

Field-to-line Coupling Model for Insulated Wiring Bundle Based on Time-domain BLT Equation

为研究外场辐照下复杂线缆系统(多导体、非线性负载、带绝缘层)终端电压/电流时域响应特性规律,提出了复杂线缆束在入射场激励下的终端响应建模方法。研究在时域内重塑多导体BLT方程,在兼顾计算效率、易于向线缆网络扩展的基础上,解决了线缆束端接非线性负载的终端时域响应求解问题;并通过引入介质层系数,修正了BLT方程源矢量项,解决了常规BLT方程忽视绝缘层对入射场畸变效应而导致的误差问题。最后,将计算结果同时域有限差分法和有限积分法计算结果进行对比,验证了模型在处理复杂线缆场线耦合问题上的准确性。

In order to study the time-domain response characteristics of terminal voltage/current for complex wiring harness system(multi-conductor,nonlinear load,dielectric coatings)under external field illumination,a field coupling to transmission line modeling method based on the Baum-Liu-Tesche(BLT)equation is proposed in this paper.Through re-formulating the multi-conductor BLT equation in time domain,the response of nonlinear load connected to terminal of the wiring harness is solved,which preserves the advantages of high computing efficiency and applicability to line net-works of classic frequency domain BLT method.By introducing the coating coefficient and modifying the source vector of BLT equation,the modeling error caused by ignoring the distortion effect of dielectric coatings on incident field is eased.Finally,the calculation results are compared with the results obtained by finite difference time domain and finite integer technique,which verifies the accuracy of the model in dealing with the field coupling to complex wiring harness problem.