39. The control of the radial pickup position of a digital versatile disk (DVD) was discussed...
39. The control of the radial pickup position of a digital versatile disk (DVD) was discussed in Problem 48 Chapter 9. There, the open-loop transfer function from coil input voltage to radial pickup position was given as (Bittanti, 2002) 0.63 Ps)= 0.36 0.04 305.4 248.2 248.22, 305.4 Assume the plant is in cascade with a controller, M(s)-0.5(s+1.63) s(s+0.27) and in the closed-loop configuration shown in Fig- ure 10.20, whcre GO) = M(s)P(s) and H= 1. Do the following a. Draw the open-loop frequency response in a Nichols chart b. Predict the system's response to a unit step input Calculate the %os, al and T c. Verify the results of Part b MATLAB using MATLAB simulations ML