A tunable mechanical resonator

Zine-El-Abidine, I.; Yang, Peigang

doi:10.1088/0960-1317/19/12/125004

Cited by 21 publications

(14 citation statements)

References 11 publications

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“…Electrostatic comb structures have been the key design elements for comb-drive micromechanical resonators [ 304 , 305 , 306 , 307 , 308 , 309 , 310 , 311 , 312 , 313 , 314 , 315 ]. Multiple tuning approaches have been presented to tune the effective spring constant of the resonators, including parallel-plate [ 20 ], fringing field [ 304 ], and variable gap comb-drives [ 305 , 306 ].…”

Section: Active Frequency Tuning Methodsmentioning

confidence: 99%

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Tunable Micro- and Nanomechanical Resonators

Zhang

Peng

et al. 2015

Sensors

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Advances in micro- and nanofabrication technologies have enabled the development of novel micro- and nanomechanical resonators which have attracted significant attention due to their fascinating physical properties and growing potential applications. In this review, we have presented a brief overview of the resonance behavior and frequency tuning principles by varying either the mass or the stiffness of resonators. The progress in micro- and nanomechanical resonators using the tuning electrode, tuning fork, and suspended channel structures and made of graphene have been reviewed. We have also highlighted some major influencing factors such as large-amplitude effect, surface effect and fluid effect on the performances of resonators. More specifically, we have addressed the effects of axial stress/strain, residual surface stress and adsorption-induced surface stress on the sensing and detection applications and discussed the current challenges. We have significantly focused on the active and passive frequency tuning methods and techniques for micro- and nanomechanical resonator applications. On one hand, we have comprehensively evaluated the advantages and disadvantages of each strategy, including active methods such as electrothermal, electrostatic, piezoelectrical, dielectric, magnetomotive, photothermal, mode-coupling as well as tension-based tuning mechanisms, and passive techniques such as post-fabrication and post-packaging tuning processes. On the other hand, the tuning capability and challenges to integrate reliable and customizable frequency tuning methods have been addressed. We have additionally concluded with a discussion of important future directions for further tunable micro- and nanomechanical resonators.

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Section: Active Frequency Tuning Methodsmentioning

confidence: 99%

“…The resonant frequencies are in the range of 32 102 ± 25 Hz and obey basically the normal distribution. The stiffening or the weakening of the comb allows the resonant frequency to be swept between the multiple frequencies of the comb achieving a very wide tuning range [ 311 ]. Zhong et al .…”

Section: Active Frequency Tuning Methodsmentioning

confidence: 99%

Tunable Micro- and Nanomechanical Resonators

Zhang

Peng

et al. 2015

Sensors

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“…21,22 The stiffness of a beam can also be changed by effectively shortening its length by pinching or pressing against it. 7,23,24…”

Section: Introductionmentioning

confidence: 99%

Compliant mechanisms that achieve binary stiffness along multiple degrees of freedom

Shimohara

Lee

Hopkins

2022

Journal of Composite Materials

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Here we introduce compliant mechanisms that can be triggered using bistable switches to achieve two different states of stiffness (i.e., high and low stiffness) along multiple degrees of freedom The compliant mechanisms leverage principles of constraint manipulation and stiffness cancelation to achieve these binary states with a stiffness difference as large as an order of magnitude. Although these principles have been used in prior works to achieve binary stiffness in compliant mechanisms that achieve a single degree of freedom (DOF) (e.g., a single translation or a single rotation), this work advances the theory to achieve binary stiffness in compliant mechanisms that achieve multiple DOFs. Specifically, two designs are introduced, fabricated, and tested to demonstrate binary stiffness in two DOFs. The first design achieves binary stiffness along two orthogonal translational DOFs and the second design achieves binary stiffness about two orthogonal rotational DOFs with intersecting axes.

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“…Thus, their operating bandwidth can be quite narrow. This has motivated an extraordinary amount of research work on methods to increase the operating bandwidth of VEHs (Daqaq et al 2014;Neiss et al 2014;Roundy et al 2005;Wu et al 2013;Zine-El-Abidine and Yang 2009). Such methods include multi-mode dynamic structures, active frequency tuning by both mechanical and electrical means, and nonlinear dynamic structures.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Real-world Vibration Sources and Application to Nonlinear Vibration Energy Harvesters

Rantz

Roundy

2017

Energy Harvesting and Systems

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A tremendous amount of research has been performed on the design and analysis of vibration energy harvester architectures with the goal of optimizing power output. Often, little attention is given to the actual characteristics of common vibrations from which energy is harvested. In order to shed light on the characteristics of common ambient vibration, data representing 333 vibration signals were downloaded from the NiPS Laboratory “Real Vibration” database, processed, and categorized according to the source of the signal (e. g. vehicle, machine, etc.), the number of dominant frequencies, the nature of the dominant frequencies (e. g. stationary, band-limited noise, etc.), and other metrics. By categorizing signals in this way, the set of idealized vibration inputs (i. e. single stationary frequency, Gaussian white noise, etc.) commonly assumed for harvester input can be corroborated and refined. Furthermore, some heretofore overlooked vibration input types are given motivation for investigation. The classification determined that, of the set of signals used in the study, 64 % of the animal source signals are best described with nonstationary dominant frequencies, 58 % of machine source signals are best described with stationary frequencies, and vehicle source signals are poorly described by any one signal type used in the classification. Nonlinear harvesters with a cubic stiffness term have received extensive attention in the scholarly literature; a numerical simulation and optimization procedure were performed using several representative signals as vibration inputs to determine the prevalence with which such a nonlinear harvester architecture might provide improvement to power output. The analysis indicated that a nonlinear harvester architecture may prove beneficial in increasing power output over a linear counterpart if the signal contains a single, dominant frequency that is not stationary in time, as evidenced by a 14 % increase in harvester power output when employing an architecture with a nonlinear cubic stiffness function. Other studies have indicated that nonlinear architectures may be beneficial for signals with nonstationary frequencies or filtered noise. 53 % of the all characterized signals fall into categories that could potentially benefit from a nonlinear oscillator architecture.

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A tunable mechanical resonator

Cited by 21 publications

References 11 publications

Tunable Micro- and Nanomechanical Resonators

Tunable Micro- and Nanomechanical Resonators

Compliant mechanisms that achieve binary stiffness along multiple degrees of freedom

Characterization of Real-world Vibration Sources and Application to Nonlinear Vibration Energy Harvesters

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