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零输入响应初始条件的处理
引用本文:张小虹,王丽娟.零输入响应初始条件的处理[J].电气电子教学学报,2008,30(1):33-35,70.
作者姓名:张小虹  王丽娟
作者单位:解放军理工大学,江苏,南京
摘    要:经典“信号与系统”教科书中,在时域部分为了强调零输入响应是由换路前0-瞬间系统储能产生的,大都将初始条件给定为y(k)(0-),并表明因为激励为零时,系统的状态不会发生变化,所以有y(k)(0-)=y(k)(0+)。因此可用y(k)(0-)直接求解零输入响应。在不涉及具体电路问题时,上述方法简洁明了。本文举例说明在激励为零时,求解具体电路零输入响应时,会有y(k)(0-)≠y(k)(0+),从而导致双解情况的出现。为此笔者建议将y(k)(0-)改为y(k)(0+),既可使求解具有物理意义或工程背景问题与一般数学问题一致,又有利于学生掌握零输入响应求解方法。

关 键 词:y(k)(0-)  y(k)(0+)  零输入响应  初始条件
文章编号:1008-0686(2008)01-0033-04
收稿时间:2007-05-22
修稿时间:2007-11-16

Processing the Initial Condition of Zero-input-response
ZHANG Xiao-hong,WANG Li-juan.Processing the Initial Condition of Zero-input-response[J].Journal of Electrical & Electronic Engineering Education,2008,30(1):33-35,70.
Authors:ZHANG Xiao-hong  WANG Li-juan
Affiliation:ZHANG Xiao-hong;WANG Li-juan(Science and Technology University of PLA;Nanjing;China)
Abstract:In the part of time zone in classical Signal and System textbooks,in order to emphasize that zero-input-response is caused by stored energy of 0-before switching,y(k)(0-) is intended to be initial condition.Because of the excitation being zero,the system state can not be changed,so y(k)(0-)=y(k)(0+) and y(k)(0-) can be directly used to solve the zero-input-response.This method is concise if not be used in specific circuit.This article cites examples to indicate that y(k)(0-)≠y(k)(0+) when solving the zero-input-response in specific circuit at the time that the excitation being zero,which leads to two results.Changing y(k)(0-) to y(k)(0+) will make the result have sense of physics or unify the question of engineering back-ground and general question of mathematics,and also make the students master the method of solving zero-input-response.
Keywords:y(k)(0-)  y(k)(0+)  zero-input-response  initial condition
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