With the enhancement of the manufacture technique, these devices are no longer to be the main harmonic sources. So they can be expressed by equivalent impedance.
随着制造工艺的完善，虽然这类设备已不再是电力系统的主要谐波源，在谐波分析中可以近似用等值阻抗表示。
参考来源 - 电力系统谐波分析的元件模型和系统仿真Thirdly, in elasticity part, mathematic model is constructed by using finite splines method; in piezoelectric part, the dynamic-character of piezoelectric actuator is represented by using equivalent impedance method.
在弹性结构部分采用有限样条法建立数学模型,在压电元件部分中用压电等效阻抗代表压电元件的动态特性。
参考来源 - 二维压电片激励弹性薄板的动力分析·2,447,543篇论文数据，部分数据来源于NoteExpress
Two kinds of network side equivalent impedance are chosen for the study of voltage stability.
在利用该方法研究电压稳定问题过程中，选取了两种类型的网络侧等效阻抗。
And the extent of difference amplitude caused by impedance decrease is more than equivalent impedance increase.
油层声波阻抗变化方向导致差异波形振幅幅度变化的快慢。
Meanwhile, it has been indicated that QP calculated is inaccurate by using traditional equivalent impedance theorem.
同时指出，用传统的串并联阻抗等效的方法计算出的QP的值是不准确的。
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