Nonlinear behaviour of self-excited microcantilevers in viscous fluids

Mouro, J, Tiribilli, B and Paoletti, P ORCID: 0000-0001-6131-0377 (2017) Nonlinear behaviour of self-excited microcantilevers in viscous fluids. Journal of Micromechanics and Microengineering, 27 (09).

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Abstract

Microcantilevers are increasingly being used to create sensitive sensors for rheology and mass sensing at the micro- and nano-scale. When operating in viscous liquids, the low quality factor of such resonant structures, translating to poor signal-to-noise ratio, is often manipulated by exploiting feedback strategies. However, the presence of feedback introduces poorly-understood dynamical behaviours that may severely degrade the sensor performance and reliability. In this paper, the dynamical behaviour of self-excited microcantilevers vibrating in viscous fluids is characterized experimentally and two complementary modelling approaches are proposed to explain and predict the behaviour of the closed-loop system. In particular, the delay introduced in the feedback loop is shown to cause surprising non-linear phenomena consisting of shifts and sudden-jumps of the oscillation frequency. The proposed dynamical models also suggest strategies for controlling such undesired phenomena.

Item Type:	Article
Uncontrolled Keywords:	rheology, microcantilever-based sensor, self-excitation, nonlinear dynamics, viscosity
Depositing User:	Symplectic Admin
Date Deposited:	04 Jul 2017 14:50
Last Modified:	19 Jan 2023 07:00
DOI:	10.1088/1361-6439/aa7a6f
Open Access URL:	http://iopscience.iop.org/article/10.1088/1361-643...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3008323