解:式中 Y(s)-90(0)+4s(s)-y(0)+3Y(s)=2Rs 其中y(O=1 Y(s) (S+4) R(S) (s2+4s+3)(s2+4S+3) (s)=-(s S+4) (s2+4s+3)s(S2+4s+3) DEl MODERN CONTROL SYSTEMMODERN CONTROL SYSTEM 8 解：式中 [ ( ) (0)] 4[ ( ) (0)] 3 ( ) 2 ( ) 2 s Y s − sy + sY s − y + Y s = R s 其中 y(0) = 1 ( 4 3) 2 ( 4 3) ( 4) ( ) 2 2 + + + + + + = s s s s s s Y s ( ) ( 4 3) 2 ( 4 3) ( 4) ( ) 2 2 R s s s s s s Y s + + + + + + =