Integrated optimal design of passive and active elements for hard disk servo systems

To achieve high density and high speed access of magnetic disk drives, integrated optimization method is applied for designing the head-suspension assembles. Approximation is used to the model of a head-suspension assembly, which makes it possible to obtain a nice analytical result on Riccati equations. Using this approach, we can obtain an explicit expression of the optimal controller in a state space form. Based on this setup, the simultaneous optimization problem both on active and passive parameters is reduced to a simpler one. A numerical example is given to show that a better performance of a magnetic disk drive can be obtained by the simple design procedure