Transient response with unit-step input F my+bi+ky=F m b b @.-Vm 2√mk +250n少+o7y= kS 1/m y(o)s+25os+@(F m y k b m  y   by  ky  F n k m   2 b mk   2 2 n n F y yy m           2 2 1/ 2 n n m Ys Fs s s       Transient response with unit-step input