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An Adaptive Amplitude-Based Self-Sensing Piezoelectrically-Driven Microcantilever Sensor

[+] Author Affiliations
Samira Faegh, Sohrab Eslami, Nader Jalili

Northeastern University, Boston, MA

Paper No. DSCC2010-4146, pp. 549-555; 7 pages
doi:10.1115/DSCC2010-4146
From:
  • ASME 2010 Dynamic Systems and Control Conference
  • ASME 2010 Dynamic Systems and Control Conference, Volume 2
  • Cambridge, Massachusetts, USA, September 12–15, 2010
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-4418-2 | eISBN: 978-0-7918-3884-6
  • Copyright © 2010 by ASME

abstract

This paper presents an adaptive amplitude-based self-sensing strategy for ultrasmall tip mass estimation utilizing piezoelectrically-driven microcantilevers. The proposed configuration overcomes the inherent shortfalls (e.g., thermal drifts, electronic noise, and restriction to use in liquid media) currently exist in conventional systems. The microcantilever operates in self-sensing mode utilizing a piezoelectric patch deposited on the cantilever surface. The piezoelectric patch actuates the beam and at the same time senses the beam vibration through inverse and direct piezoelectric effects, respectively, which enables measurement of the surface induced stress. To remedy the measurement limitation at the microscale due to lack of sensitivity and temperature dependency of piezoelectric, an advanced auto-tunable self-sensing controller is proposed which balances the capacitance bridge network. Moreover, an optimization strategy is developed to minimize the error of the output voltage considering the fact that the individual time dependent coordinates are not measurable. Mathematical models and equations of motion are obtained using the Hamilton’s principle treating the microcantilever as a distributed-parameters system. Simulations are performed to demonstrate the effectiveness of the proposed technique.

Copyright © 2010 by ASME

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