- A A Hard Disk Drive Hdd Is An Electro Mechanical Data Storage Device That Stores And Retrieves Digital Data Using Mag 1 (49.89 KiB) Viewed 38 times
a. A hard disk drive (HDD) is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage and one or more rigid rapidly rotating platters coated with magnetic material. Figure 1 shows a simplified block diagram of a HDD. For analysis purposes, given gain K=30 and G(s) = - determine the open- s(s+4) loop and closed loop poles of the HDD and plot these separately in the S-Plane. Also discuss the stability using two different approaches. (10 Marks) gain plant K G(s) F Figure 1 _AMO_TEM_035_04 Page 2 of Control and Instrumentation 1 (ENGG 0009.1) - Spring - 22 - CW (Assignment1) - All - QP b. For unity feedback system, the feed forward transfer function is K G(S) s(1 +0.45s)(1 + 0.15s)(1 + 0.55s) Calculate the following: I. the range of values of 'K' to maintain stability (5 Marks) ii. marginal value of k (2 Marks) iii. frequency of sustained oscillation at marginal k. (3 Marks)