Tuning fork microgyrometers: Narrow gap vs. wide gap design

Soria, Leonardo; Pierro, Elena; Carbone, Giuseppe; Contursi, T.

doi:10.1016/j.jsv.2008.10.034

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…We find that the IPMCs vibrate in phase, with nearly identical phase lags between them, and that their amplitudes are highly comparable, with larger vibrations attained for the internal IPMCs. Such a response is primarily associated with the eigenvector in in equation ( 13) whose components share nearly the same phase and have an amplitude that increases from the first and last entries towards the central entry, in the whole frequency range [61,62].…”

Section: Underwater Vibrationsmentioning

confidence: 99%

Effect of hydrodynamic interaction on energy harvesting in arrays of ionic polymer metal composites vibrating in a viscous fluid

Cellini

Intartaglia

Soria

et al. 2014

Smart Mater. Struct.

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In this paper, we investigate underwater energy harvesting of a parallel array of nominally identical ionic polymer metal composites (IPMCs) subjected to low frequency base excitation in water. The IPMCs are connected in parallel and shunted with a varying resistor. We model the IPMCs as slender beams with uniform cross section undergoing small oscillations in an otherwise quiescent viscous fluid. We utilize a boundary element approach to compute the hydrodynamic loading on each structure, which is due to the oscillations of the whole array. Leveraging recent findings on sensing in ionic polymer metal composites, we propose a coupled electromechanical model for predicting energy harvesting as a function of the IPMCs' impedance and the base excitation. To validate our theoretical predictions, we perform experiments on an in-house-fabricated array of five centimeter-size composites, which we characterize on a dedicated test rig. We experimentally determine the power harvested by varying the excitation frequency in the broad range 2-35 Hz and the shunting resistance from 1 to 1000 .

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Section: Underwater Vibrationsmentioning

confidence: 99%

Effect of hydrodynamic interaction on energy harvesting in arrays of ionic polymer metal composites vibrating in a viscous fluid

Cellini

Intartaglia

Soria

et al. 2014

Smart Mater. Struct.

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show abstract

“…The accurate estimation of the hydrodynamic loading on flexible structures vibrating in liquids is of fundamental importance in the study of microelectromechanical systems, such as atomic force microscope probes [1][2][3][4] and radio frequency switches [5][6][7][8][9]; sensors and energy harvesting devices [10][11][12][13][14][15][16]; miniature propulsion systems across biology [17,18] and engineering [19][20][21][22][23]; and naval structures [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic coupling of two sharp-edged beams vibrating in a viscous fluid

2014

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In this paper, we study flexural vibrations of two thin beams that are coupled through an otherwise quiescent viscous fluid. While most of the research has focused on isolated beams immersed in placid fluids, inertial and viscous hydrodynamic coupling is ubiquitous across a multitude of engineering and natural systems comprising arrays of flexible structures. In these cases, the distributed hydrodynamic loading experienced by each oscillating structure is not only related to its absolute motion but is also influenced by its relative motion with respect to the neighbouring structures. Here, we focus on linear vibrations of two identical beams for low Knudsen, Keulegan-Carpenter and squeeze numbers. Thus, we describe the fluid flow using unsteady Stokes hydrodynamics and we propose a boundary integral formulation to compute pertinent hydrodynamic functions to study the fluid effect. We validate the proposed theoretical approach through experiments on centimetre-size compliant cantilevers that are subjected to underwater base-excitation. We consider different geometric arrangements, beam interdistances and excitation frequencies to ascertain the model accuracy in terms of the relevant nondimensional parameters.

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“…Looking at its mechanical structure, a QTF can be considered as two cantilevers (prongs) joined at a common base. The inplane flexural modes of vibrations of the QTFs can be classified into two groups: symmetrical modes, where the prongs moves along the same direction, and anti-symmetrical modes, where the two prongs oscillate along opposite directions [18,19]. The in-plane anti-symmetrical modes are the predominant ones when a sound source is positioned between the prongs, forcing them to move in the opposite directions.…”

mentioning

confidence: 99%