(Solved): I need help on part (b) 3-11. Fig. 3P-11 shows the block diagram of a dc-motor control system. Th ...

I need help on part (b)

3-11. Fig. 3P-11 shows the block diagram of a dc-motor control system. The signal $$N(s)$$ denotes the frictional torque at the motor shaft. (a) Find the transfer function $$H(s)$$ so that the output $$Y(s)$$ is not affected by the disturbance torque $$N(s)$$. (b) With $$H(s)$$ as determined in part (a), find the value of $$K$$ so that the steady-state value of $$e(t)$$ is equal to $$0.1$$ when the input is a unit-ramp function, $$r(t)=t{u}_s(t),R(s)=1/s^2$$, and $$N(s)=0$$. Apply the final-value theorem. Figure 3P-11