Transient response with unit-step input j9+250n少+07y=07u(t) Roots are s.2=-50n±j0nV1-52=-60n±j0a Damped natural frequency 阻尼自然频率 213816412 1 0.2 0.4 Rs)s 0.6 ξ=0.8 c(t)=1- s:0 sin@,1+A)(e0) B=g-5 tp 5 10 15 0<5<1 Underdamped (欠阻尼)Roots are 0   1 Underdamped (欠阻尼) n n n d s    j      j 2 1,2 1 sin( ) 1 ( ) 1 2          t e c t d t n (t0) 2 d n 1 Damped natural frequency 阻尼自然频率 s R s 1 ( )     2 1 1   tg Transient response with unit-step input 2 2 2 () nn n   y y y ut     