基于最小相位法的屏蔽电缆瞬态响应分析方法

Transient response analysis method of shielded cable based on minimum phase method

为了分析屏蔽电缆在电磁脉冲作用下的时域响应,对基于最小相位法的频域等效方法进行了研究。首先,通过建立转移阻抗测试系统的电路模型,推导系统的频域传递函数,并验证其为最小相位系统与全通系统的级联;其次,采用最小相位法,对测得的幅频曲线进行相位重构,根据推导的传递函数的零、极点分布,对重构的最小相位传递函数进行相位补偿;最后,将补偿后的传递函数与瞬态干扰信号在频域相乘后变换到时域,得到了屏蔽电缆的时域响应。仿真及实验结果验证了该方法的有效性。

To analyze the transient electromagnetic response of shielded cables in time domain when they are subjected to electromagnetic pulse,a frequency domain equivalent method based on minimum phase method is studied in this paper.First,by establishing the circuit model of the transfer impedance testing system,the transfer function of the system in frequency domain is derived,and it is verified as the cascade of a minimum phase system and an all-pass system.Secondly,the minimum phase of the measured amplitude-frequency curve is reconstructed by using the minimum phase method,then the phase of the reconstructed transfer function is compensated according to the distribution of zeros and poles.Finally,the time domain response of the shielded cable is obtained after multiplying the compensated transfer function with the transient interference signal in frequency domain and transforming into time domain.The effectiveness of the proposed method is verified by simulation and experiment.