This paper investigates the parametric excitation of a micro-pipe conveying fluid suspended between two symmetric electrodes. Electrostatically actuated micro-pipes may become unstable when the exciting voltage is greater than the pull-in value. It is demonstrated that the parametric excitation of a micro-pipe by periodic (ac) voltages may have a stabilizing effect and permit an increase of the...

This paper applies a recently proposed numerical algorithm to discuss the deflection of viscoelastic micro-beams in time domain with direct access. A nonlinear-fractional order model for is constructed. Before solving governing equations, operator matrices shifted Chebyshev polynomials are derived first. Shifted used approximate function, and nonlinear fractional equation expressed form matrice...

The static pull-in instability of beam-type micro-electromechanical systems is theoretically investigated. Two engineering cases including cantilever and double cantilever micro-beam are considered. Considering the mid-plane stretching as the source of the nonlinearity in the beam behavior, a nonlinear size-dependent Euler-Bernoulli beam model is used based on a modified couple stress theory, c...

The IHACRES model has been successfully applied to many catchments across the UK including regionalization studies (e.g. Sefton and Howarth, 1998; Littlewood, 2003). However, while the previous formulation of the non-linear module performs well in calibration and simulation, the module has some identified deficiencies in the representation of the impacts of climate change on volume of streamflo...

Spherical tokamaks (STs) provide a challenging regime for the study of turbulent transport in magnetised plasmas, providing an opportunity to test gyrokinetic and MHD fluid turbulence theory under extreme conditions. The strong field curvature at low aspect ratio has an important influence on micro-stability; both aspect ratio and flow-shear affect transport and at high-β, electromagnetic effec...

As micro-device application in consumer and commercial products develops, efficient tools are required to simulate device dynamics and assess structural performance. An integrated methodology is developed for studying the dynamics of thin film bifurcating structures. Results are presented for a generic thin film structure, which exhibit classical electro-mechanical hysteresis. Such structures c...