Abstract
In this paper, a relationship of a natural frequency, a damping and a feedforward acceleration with a transient vibration of track-seek control was derived theoretically, and a proper design target for dynamics of a head actuator of a hard drive was discussed from the viewpoint of reducing the transient vibrations. When the feedforward acceleration of the track-seek control is expressed as a polynomial, a transient response of a single degree-of-freedom (DOF) system is solved by applying integral by parts to the Duhamel's integral. The results shows the transient vibrations are generated at the initial and terminal of the feedforward acceleration and its amplitude depends on the orders of non-zero derivatives of the polynomial. Meanwhile, the amplitude also depends on seek time and it should be reduced as decreasing track pitch. The seek time and track pitch are key factors related to drive performances: access time and capacity. So, the target of the transient vibration reduction also depends on the order of polynomial.
