Multivariable control designs for piezoelectric tubes

Bhikkaji, Bharath and Yong, Yuen Kuan and Mahmood, Iskandar Al-Thani and Moheimani, S.O. Reza (2011) Multivariable control designs for piezoelectric tubes. In: The 18th World Congress of the International Federation of Automatic Control (IFAC 2011), 28 August - 2 September 2011, Milano, Italy.

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Abstract

Most AFMs use piezoelectric tube nanopositioners for scanning. Fast actuation of piezoelectric tubes are restricted due to the presence of low mechanical resonant modes. These resonances, when excited, set off vibrations that cause loss of precision and repeatability of the scans. Thereby restricting the scanning frequencies to less than 1% of the first resonance frequency. Here, an innovative multivariable control design methodology for damping the resonant modes of the tube is presented. This methodology exploits the symmetry present in transfer-functions relating the input and output, and converts the multivariable control design problem into independent SISO designs. This methodology in conjunction with Integral Resonant control is used for damping the first resonant mode of the tube, and enables scans upto 10% of the first resonant mode. The proposed methodology can be applied to a large class of parallel kinematics nanopositioners used in scanning probe microscopes and probe-based data storage systems.

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	3614/6636 DOI:10.3182/20110828-6-IT-1002.01745
Uncontrolled Keywords:	Atomic Force Microscopes, Piezoelectric tubes, Nanopositioners, Resonance, Multivariable Control and Integral Resonant Control.
Subjects:	Q Science > Q Science (General) T Technology > TJ Mechanical engineering and machinery > TJ212 Control engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechatronics Engineering
Depositing User:	Dr. Iskandar Al-Thani bin Mahmood
Date Deposited:	30 Nov 2011 22:52
Last Modified:	30 Nov 2011 22:52
URI:	http://irep.iium.edu.my/id/eprint/6636

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