if the feed-forward transfer function of a system is g(s)，feedback block is h(s)，the system open-looptransfer function is
if the closed-loop transfer function of the unity-feedback control system is , then the open-loop transfer function of the system is
which one is correct about system transfer function?
transfer function is suitable for ( ) system.
for a lti system, the unit-impulse response can be obtained by differentiating the corresponding response.
obtain the transfer function of u0(s)/ui(s)
system dynamic structure block is shown as below，r(s)is input signal，n(s)is disturbance signal，obtain the transfer function of c(s)/r(s)
system dynamic structure block is shown as below，r(s)is input signal，n(s)is disturbance signal，obtain the transfer function of c(s)/n (s)
closed-loop control system is an automatic control system. open-loop control system is not an automatic control system.
the system is a system. (linear/nonlinear)
the closed-loop transfer function of a second-order system is the step response of the system will
the transfer function of a closed-loop system is g(s)=1/(s(s 1)) ，then the unit impulse response of the system is
if the steady-state error of unity feedback control system to a ramp input is constant, then the system is a type system
system dynamic structure block is shown in figure, （1） determine the range of k for system stability.
(2)determine the range of k for the root of the system all on the left side of s=-1 in the s plane.
(3)determine the range of k for the steady-state error ess<=0.25 at input r(t)=2t 2.
given the transfer function g(s) of a system (3s 7)/(s(s 1)) a unit step u(t) is applied to the system’s input, then the time response y(t) is ( ).
the control system is shown in figure a. when gc(s)=0，(1)determine the , the damping ratio of the closed-loop system .
(2) in figure a, determine the undamped natural frequency of the closed-loop system.
(3)in figure a, determine the maximum overshoot of the closed-loop system .
(4)in figure a, determine the settling time (5% criterion) of the closed-loop system .
(5 )in figure a, determine the steady-state error to a ramp input signal.
(6)in figure a, making the steady-state error 0 to a ramp input signal, what is gc(s)? ( e(t)=r(t)-c(t) )
determine the range of k when the closed-loop system is stable as shown in the figure.
the characteristic equation of the system is ，then the system is（ ）.
feedback control systems
the open-loop transfer function of the unity-feedback control system is g(s)=5/(s(s 2)) . when input is the unit-step,the steady-state error is .
the transfer function of the first-order system is 5/(s 2) for 2% criterion，the settling time is s.
the point satisfying the angle condition the point on the root locus.
the effect of adding poles to the control system is
the root-locus branches terminate at .
the open-loop transfer function of the unity-feedback control system is if the breakaway point is -2.5 on the real axis, then the real part of the third closed-loop root is .
the system open-loop transfer function is the root loci on the real axix are ( ).
the system open-loop transfer function is . determine the range of k for closed-loop system stability by root-locus method .
consider a unity-feedback control system whose open-loop transfer function is , determine the range of k in underdamped case
consider a unity-feedback control system whose open-loop transfer function is ,determine the closed-loop poles at the minimum damping ratio .
consider a unity-feedback control system whose open-loop transfer function is , the breakaway and break-in points are ( ).
the open-loop transfer function of the unity-feedback control system is . design a compensator as（τs 1） so that the dominant closed-loop poles are located at points -1±j1, and determine the value of τ.
the transfer function of a compensation is , when ，it is a lead compensation.
the effect of adding poles to the control system is ( ).
the transfer function of a system is . when ＝0.5rad／s，the phase shift of the output sinusoid with respect to the input sinusoid = （ ）.
the open-loop transfer function of the unity-feedback control system is , under what condition will the closed-loop system become stable?
the open-loop transfer function of a system is . the polar plot of the system is located in .
the linear system transfer function is g(s)=1/(s 2). when input signal is r(t)= sin2t，the phase shift of the steady-state output compared to the input is .
which one is correct about nonminimum-phase system?
when the order of the denominator polynomial of the minimum-phase system open-loop transfer function is greater than that of the numerator(n>m), the polar plot converge to the .
the log-magnitude curve moves towards as open-loop gain k increases.
the log-magnitude curve of a minimum-phase open-loop system is shown as figure1 . determine the system stability.
the log-magnitude curve of a minimum-phase open-loop system is shown as figure1 . determine the system open-loop transfer function go(s).