For the convenience of time -domain convolution, the vector fitting method is adopted to approach the characteristic impedance and delay function in complex frequency-domain.
为了便于时域卷积，对不同模量上的特征阻抗和延时函数在复频域采用矢量匹配法进行拟合。
The calibration of four-terminal-pair(4TP) impedance meters at their working frequencies requires the knowledge of 4TP standard capacitor frequency characteristic.
对四端对阻抗测量仪在其使用频段内进行校准，须确定四端对标准电容器的频率特性。
Experimental results on impact damaged pieces show that the presence of structure damages makes such characteristic information as mode frequency and value of piezoelectric impedance changed.
通过冲击损伤试件的实验分析表明，由于结构损伤的出现压电阻抗谱中的模态频率及其阻抗幅值等特征信息将发生变化。
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