§2-2传递函数 2.常用拉氏变换: f(t)=(1)<F(S)=1 f(t)=1F(S) f(t=ee F(s) s+a (0)=7÷F()=1 返回本节2. 常用拉氏变换： s f t F s 1 ( ) = 1 ( ) =   + =  = − s f t e F s t 1 ( ) ( ) 2 1 ( ) ( ) s f t = t  F s = f (t) =  (t)  F(s) =1 返回本节 §2-2 传递函数