Lapping control of Hard Disk Drive Heads (II): Control

Youping Mei, Kim A. Stelson

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

1 Scopus citations


Using numerical modeling as a tool, the pressure dynamics of bar lapping is identified. The process model is constructed based on the pressure dynamics and the Preston model. A controller is then designed using a trajectory following formulation. Simulation of the controller designed as such shows that it is robust to parameter uncertainties. This controller is implemented on a Seagate lapping system. Experiment results show that the proposed method is less sensitive to the quality of the preparation processes. However, the gains should be appropriately adjusted for optimal performance. With good preparation processes and appropriate gains, performance of die two methods are statistically comparable. Otherwise, the proposed method performs better. The proposed method is inferior to the existing method only when its gains are improperly adjusted.

Original languageEnglish (US)
Title of host publicationDynamic Systems and Control
Subtitle of host publicationVolume 2
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages8
ISBN (Electronic)9780791826652
StatePublished - 2000
EventASME 2000 International Mechanical Engineering Congress and Exposition, IMECE 2000 - Orlando, United States
Duration: Nov 5 2000Nov 10 2000

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)


ConferenceASME 2000 International Mechanical Engineering Congress and Exposition, IMECE 2000
Country/TerritoryUnited States

Bibliographical note

Funding Information:
The authors would like to express their sincere gratitude to the Seagate Technology for its continuous support and funding in this research.

Publisher Copyright:
© 2000 by ASME.


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