讲授网络函数与频率特性的探索

A Trial to Introduce Network Function and Frequency Characteristics in Course of "Electric Circuit Theory

本文试图探讨如何在“电路原理”的课堂教学中讲解网络函数与频率特性之间的内在联系。经教学实践后表明 :从网络函数 H (S)在 s= jω时本身的物理意义、一个电路系统在频域和在时域中激励与响应之间的关系三个方面讲解网络函数与频率特性之间的内在联系 ,教学效果明显提高。以 RL C串联电路为例 。

This paper presents a method to explain relations between network function and frequency characteristic of an electric circuit clearly in class. By practice, we find that relations between network function and frequency characteristic of an electric circuit can be described in three aspects, i.e., in physic concept of H (j ω ) and the relations between excitation and its response in time domain and in frequency domain. As an example, RLC circuit in series is analyzed and the amplitude frequency characteristic curves of the outputs uC(t)? uR(t), u L(t) are given respectively.