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Improved Actuation Circuit for Vibration Control

This post is an excerpt from the journal ISA Transactions. All ISA Transactions articles are free to ISA members, or can be purchased from Elsevier Press.

 

 

Head suspension assembly of a commercial dual-stage HDD. Head suspension assembly of a commercial dual-stage HDD.

Abstract: This paper presents an improved indirect-driven self-sensing actuation circuit for robust vibration control of piezoelectrically actuated flexible structures in mechatronic systems. The circuit acts as a high-pass filter and provides better self-sensing strain signals with wider sensing bandwidth and higher signal-to-noise ratio. An adaptive non-model-based control is used to compensate for the structural vibrations using the strain signals from the circuit. The proposed scheme is implemented in a PZT-actuated suspension of a commercial dual-stage hard disk drive. Experimental results show improvements of 50 percent and 75 percent in the vibration suppression at 5.4kHz and21 kHz respectively, compared to the conventional PI control.

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