A Passive Damper for the Vibration Modes of the Head Actuator in Hard Disk Drives

Modal Testing and Finite Element Modelling of Subsystem in Hard Disk Drive

“…In order to differentiate the boundary conditions in these two drives, the mode under the operating condition with cover is termed as the lateral quasi-rigid body mode (lateral QR mode). It can be seen that the measured mode shape agrees well with that predicted in the literature such as butterfly mode [8], system mode [7] and finite element analysis described in the next section.…”

“…Furthermore, both measurement and finite element prediction show that this mode has coupled motion in the lateral direction, involving all the arms and voice coil in in-phase and in-plane motion. This proves the butterfly mode [8,13] and system mode [7] predicted in previous references.…”

“…Stricklin and Blanks [6] described the vibrations of HAA at about 2 kHz was the in-plane bending of the arm. Jiang and Miles [7] called such a mode as system mode where the entire HAA vibrated and coupled with the motion of arm and suspension sway mode. This mode was also referred to as butterfly mode by Radwan et al [8] and involved in-phase and in-plane lateral motion of all arms and the coil.…”

“…Radwan and Whaley [9] and Aruga et al [5] established two finite element models of actuator without suspension and slider, respectively. Jiang and Miles [7] built an HAA FE model in which the VCM was not included. Radwan et al [8] presented an HAA FE model including VCM, suspension and slider.…”

Aerodynamic characteristics of carriage arm equipped on hard magnetic disks

“…Structural characteristics of head stack assembly have been investigated by several researchers such as Jiang and Miles (1999), Xu and Guo (2003), Gao et al (2006), and so on. Kubotera et al (2002), Tsuda et al (2003), Shimizu et al (2003) have conducted numerical simulations to investigate flow structure around a carriage arm and the aerodynamic characteristics concerning 3.5 in.…”