The QR modes measurement and modeling in the head actuator assembly

Li Mei Xu, Seng Zeng, Ning Qun Guo, Rong Ming Lin

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)


This paper studies the characteristics of quasi-rigid body modes (QR modes), which are most important in understanding dynamic behaviour of the head actuator assembly in HDD. Experiment results are presented in terms of the frequency response functions obtained in lateral direction excitation. Finite element models are used to predict the quasi-rigid body modes and their dependence on the stiffness of pivot bearing. A good agreement is obtained between the numerical prediction and measurement. It is shown that there may exist six quasi-rigid body modes, and two of them may lead to residual vibration. The causes are likely due to flexibility of the pivot bearing system and the difference in stiffness of the two ball bearings in the pivot system.

Original languageEnglish
Title of host publication2000 Asia-Pacific Magnetic Recording Conference - Digests of APMRC 2000 on Mechanical and Manufacturing Aspects of HDD
PublisherIEEE, Institute of Electrical and Electronics Engineers
ISBN (Electronic)0780362543, 9780780362543
Publication statusPublished - 2000
Externally publishedYes
EventAsia-Pacific Magnetic Recording Conference 2000 - Tokyo, Japan
Duration: 6 Nov 20008 Nov 2000 (Proceedings)


ConferenceAsia-Pacific Magnetic Recording Conference 2000
Abbreviated titleAPMRC 2000
Internet address


  • head actuator assembly
  • pivot-bearing
  • quasi- rigid body mode
  • Vibration

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