5.4-7已知输入f(t)=s(t),求冲激响应h(t)和零状态响应yzs(t)。f(t)tS32sX(s)F(S)2s(S)X(s)S0X(s)S32
第 6 页 5.4-7 已知输入f(t)=(t)，求冲激响应h(t)和零状态 响应 yzs(t)
解：亚画出s域框图，设右边加法器输入为X（s）s2X(s) = F(s)-3sX(s)-2X(s)sX(s)12F(S)Yz(S)s'x(s)X(S)3-F(s)X(s)=1M>S? +3s +232Yzs(s) = sX(s) + 3X(s31S+32s+3122F(s)s? +3s +2 ss? +3s+2s+ 2ss+13-2t2e)8(t)Yzs(t) =(e2221s+3h(t) =(2e-t -e-2t)c(t)H(S)=2+3s+2s+2s+1第7页
第 7 页 解：画出s域框图, s 2X(s) = F(s)-3sX(s)–2X(s) Yzs(s) = sX(s) + 3X(s) ( ) 3 2 1 ( ) 2 F s s s X s s s s s F s s s s 1 3 2 3 ( ) 3 2 3 2 2 设右边加法器输入为X(s) yzs(t) =( )(t) t t e e 2 2 1 2 2 3 2 1 1 2 3 2 3 ( ) 2 s s s s s H S ( ) (2 ) ( ) 2 h t e e t t t 2 2 1 1 2 2 3 s s s