The effect of capillary and intermolecular forces on instability of the electrostatically actuated microbeam with T-shaped paddle in the presence of fringing field

Firouzi, Behnam; Zamanian, M.

doi:10.1016/j.apm.2019.02.016

Cited by 9 publications

(1 citation statement)

References 40 publications

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“…The oscillation of plates and shells caused by electric, magnetic, optical, and thermal excitations is widely used in aerospace, military and civil engineering [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. In recent years, light-powered oscillation of LCE has gained huge interests.…”

Section: Introductionmentioning

confidence: 99%

Beating of a Spherical Liquid Crystal Elastomer Balloon under Periodic Illumination

Cheng

et al. 2022

Micromachines

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Periodic excitation is a relatively simple and common active control mode. Owing to the advantages of direct access to environmental energy and controllability under periodic illumination, it enjoys broad prospects for application in soft robotics and opto-mechanical energy conversion systems. More new oscillating systems need to be excavated to meet the various application requirements. A spherical liquid crystal elastomer (LCE) balloon model driven by periodic illumination is proposed and its periodic beating is studied theoretically. Based on the existing dynamic LCE model and the ideal gas model, the governing equation of motion for the LCE balloon is established. The numerical calculations show that periodic illumination can cause periodic beating of the LCE balloon, and the beating period of the LCE balloon depends on the illumination period. For the maximum steady-state amplitude of the beating, there exists an optimum illumination period and illumination time rate. The optimal illumination period is proved to be equivalent to the natural period of balloon oscillation. The effect of system parameters on beating amplitude are also studied. The amplitude is mainly affected by light intensity, contraction coefficient, amount of gaseous substance, volume of LCE balloon, mass density, external pressure, and damping coefficient, but not the initial velocity. It is expected that the beating LCE balloon will be suitable for the design of light-powered machines including engines, prosthetic blood pumps, aircraft, and swimmers.

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Section: Introductionmentioning

confidence: 99%

Beating of a Spherical Liquid Crystal Elastomer Balloon under Periodic Illumination

Cheng

et al. 2022

Micromachines

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Analytical estimates of the pull-in voltage for carbon nanotubes considering tip-charge concentration and intermolecular forces

Bianchi

Radi

2020

Meccanica

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Two-side accurate analytical estimates of 10 the pull-in parameters of a carbon nanotube switch 11 clamped at one end under electrostatic actuation are 12 provided by considering the proper expressions of the 13 electrostatic force and van der Waals interactions for a 14 carbon nanotube, as well as the contribution of the 15 charge concentration at the free end. According to the 16 Euler-Bernoulli beam theory, the problem is governed 17 by a fourth-order nonlinear boundary value problem. 18 Two-side estimates on the centreline deflection are 19 derived. Then, very accurate lower and upper bounds 20 to the pull-in voltage and deflection are obtained as 21 function of the geometrical and material parameters. 22 The analytical predictions are found to agree remark-23 ably well with the numerical results provided by the 24 shooting method, thus validating the proposed 25 approach. Finally, a simple closed-form relation is 26 proposed for the minimum feasible gap and maximum 27 realizable length for a freestanding CNT cantilever.

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Lateral pull-in instability of electrostatic MEMS transducers employing repulsive force

2020

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The effect of capillary and intermolecular forces on instability of the electrostatically actuated microbeam with T-shaped paddle in the presence of fringing field

Cited by 9 publications

References 40 publications

Beating of a Spherical Liquid Crystal Elastomer Balloon under Periodic Illumination

Beating of a Spherical Liquid Crystal Elastomer Balloon under Periodic Illumination

Analytical estimates of the pull-in voltage for carbon nanotubes considering tip-charge concentration and intermolecular forces

Lateral pull-in instability of electrostatic MEMS transducers employing repulsive force

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