Dynamic pull-in of thermal cantilever nanoswitches subjected to dispersion and axial forces using nonlocal elasticity theory

2020

Sci Rep

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this research work deals with analyzing instability and nonlinear behaviors of piezoelectric thermal nano-bridges. An adjustable thermo-elastic model with the ability to control stability conditions is developed to examine the system behavior at different temperatures. To increase the performance range and improve system characteristics, a piezovoltage is applied and a spring is connected to the sliding end of the deformable beam as design parameters. The partial differential equations (PDEs) are derived using the extended Hamilton's principle and Galerkin decomposition is implemented to discretize the nonlinear equations, which are solved via a computational method called the step-bystep linearization method (SSLM). To improve the accuracy of the solution, the number of mode shapes and the size of voltage increments are analyzed and sufficient values are employed in the solution. The validity of the formulation and solution method is verified with experimental, analytical, and numerical data for several cases. finally, the vibration and eigenvalue problem of the actuated nanomanipulator subjected to electrostatic and casimir attractions are investigated. it is concluded that the fringing-fields correction changes the system frequency, static equilibrium, and pull-in characteristics significantly. The results are expected to be instrumental in the analysis, design, and operation of numerous adjustable advanced nano-systems.should be taken into account because this consideration improves the prediction of the critical voltage for the snap-through, and the overall behavior of arch nano-systems. Moreover, the experimental validation demonstrates that the fringing correction in nano-devices acts a key role that should be considered in the modelling.Thermal sensitive nano-electromechanical manipulators have numerous industrial applications. Rokni and Lu 26 studied the behavior of fully-clamped multi-layer nano-ribbons subjected to electric and Casimir forces at different temperatures without considering the size parameter. The stability of fully-clamped miniature beams under thermal, molecular and electromechanical effects was examined 27 without modelling the surface energy. The static pull-in instability of a thermal nano-cantilever piezowire under vdW attraction was examined by SoltanRezaee and Ghazavi 28 while the frequency analysis and investigation of different electric fringing-fields corrections were not carried out. Pradiptya and Ouakad 29 investigated the size-dependent dynamic response of fixed-fixed carbon nano-tubes subjected to DC and AC fields by considering thermal effects using SGT. The impacts of Poisson's ratio on structural behaviors of a nano-wire by considering high-temperature variations were studied using CST 30 . Recently, Tavakolian et al. 31 analyzed the dynamic stability of size-dependent nano-cantilevers under electro-thermal actuation without taking the surface layer effects into account. It is worth noting that the pull-in parameters of clamped-clamped smart MEMS were extensively studied...

Section: Theoretical Modelmentioning

confidence: 99%

mentioning

confidence: 99%

Nonlinear dynamic stability of piezoelectric thermoelastic electromechanical resonators

2020

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“…where V is the voltage applied between electrodes and ε 0 = 8.8×10 -12 F.m -1 is the space permittivity. In addition, the Casimir attraction between the microwire and substrate is given by [45] , 2 16 ln…”

Section: External Workmentioning

confidence: 99%

“…Exemplary characteristics of micro and nanoelectromechanical systems (M/NEMS) are low weight, high precision, and low energy consumption. Such systems are being appeared in an extensive variety of applications, including sensors/actuators, capacitive switches, smart systems, tunable valves, ultra-sensitive detectors, and biodevices [1][2][3][4][5][6][7]. Analyzing the structural behavior and instability conditions of these systems are essential to improve their design and performance [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear stability analysis of piecewise actuated piezoelectric microstructures

International Journal of Mechanical Sciences

Farrokhabadi

et al. 2019

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“…Biosensors have been introduced to detect different characteristics of biological particles. They have numerous applications in biotechnology as biomass detectors 1,2 , thermal switches [3][4][5][6] , smart resonators [7][8][9][10][11][12] , and other biomedical devices [13][14][15][16][17][18][19][20][21][22][23][24] . Due to the important biological applications of such systems in the drug delivery, clinical diagnostics, measurement, and organism detection, many scientists have studied their features such as operational range, instability, and performance 8,24,25 .…”

mentioning

confidence: 99%

Simulation of an electrically actuated cantilever as a novel biosensor

2020

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Recently, detecting biological particles by analyzing their mechanical properties has attracted increasing attention. To detect and identify different bioparticles and estimate their dimensions, a mechanical nanosensor is introduced in this paper. to attract particles, numerous parts of the substrate are coated with different chemicals as probe detectors or receptors. The principal of cell recognition in this sensor is based on applying an electrical excitation and measuring the maximum deflection of the actuated cantilever electrode. investigating the critical voltage that causes pull-in instability is also important in such highly-sensitive detectors. the governing equation of motion is derived from Hamilton's principle. A Galerkin approximation is applied to discretize the nonlinear equation, which is solved numerically. Accuracy of the proposed model is validated by comparison studies with available experimental and theoretical data. The coupled effects of geometrical and mechanical properties are included in this model and studied in detail. Moreover, system identification is carried out to distinguish bioparticles by a stability analysis. Due to the absence of a similar concept and device, this research is expected to advance the state-of-the-art biosystems in identifying particles.