Consider the stable closed-loop system shown in the figure. The magnitude and phase values of the frequency response of $G(s)$ are given in the table. The value of the gain $K_I$ ($>0$) for a $50^\circ$ phase margin is _____ (rounded off to 2 decimal places).
| $\omega$ in rad/sec | Magnitude in dB | Phase in degrees |
|---|---|---|
| 0.5 | −7 | −40 |
| 1.0 | −10 | −80 |
| 2.0 | −18 | −130 |
| 10.0 | −40 | −200 |
The magnitude and phase plots of an LTI system are shown in the figure. The transfer function of the system is
Consider a lead compensator of the form
$$K(s) = {{1 + {s \over a}} \over {1 + {s \over {\beta a}}}},\beta > 1,a > 0$$
The frequency at which this compensator produces maximum phase lead is 4 rad/s. At this frequency, the gain amplification provided by the controller, assuming asymptotic Bode-magnitude plot of $$K(s)$$, is 6 dB. The values of $$a,\beta$$, respectively, are
An LTI system is shown in the figure where $$G(s) = {{100} \over {{s^2} + 0.1s + 100}}$$. The steady state output of the system, to the input r(t), is given as y(t) = a + b sin(10t + $$\theta$$). The values of a and b will be
