SAGE Publications
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Design of Mechanical Band-Pass Filters for Energy Scavenging: Multi-Degree-of-Freedom Models In this article, a model of a mechanical band-pass filter to be used in energy scavengers is studied. The filter is an ensemble of cantilever beams where at the tip of each beam a mass, known as the proof mass, is mounted. A beam with a proof mass at its tip is called a beam-mass system. The dynamics of a beam-mass system can be represented by its corresponding generalized single-degree-o... ...
SAGE Publications - Tập 14 Số 5 - Trang 753-768 - 2008
Non-linear Systems Under Poisson White Noise Handled by Path Integral Solution An extension of the path integral to non-linear systems driven by a Poissonian white noise process is presented. It is shown that at the limit when the time increment becomes infinitesimal the Kolmogorov— Feller equation is fully restored. Applications to linear and non-linear systems with different distribution of the Dirac's deltas occurrences are performed and results are compared with... ...
SAGE Publications - Tập 14 Số 1-2 - Trang 35-49 - 2008
Iteration Perturbation Method for Strongly Nonlinear Oscillations In this paper, the author proposes a new perturbation technique coupling with iteration method, yielding a powerful mathematical tool for an analytical solution of nonlinear equations. The obtained results are valid not only for weakly nonlinear problems but also for strongly nonlinear ones. Furthermore, the approximate solutions are valid for the whole solution domain, and even the first... ...
SAGE Publications - Tập 7 Số 5 - Trang 631-642 - 2001
Application of high-resolution spectral analysis for identifying faults in induction motors by means of sound Induction motors are critical components for most industries. Induction motor failures may yield an unexpected interruption at the industry plant. Several conventional vibration and current analysis techniques exist by which certain faults in rotating machinery can be identified. Ever since the first motor was built, plant personnel have listened to the noises emanating from machines; wit... ...
SAGE Publications - Tập 18 Số 11 - Trang 1585-1594 - 2012
Vortex-induced vibration analysis of viscoelastically mounted rigid circular cylinders in cross-flow at a moderate Reynolds number The vortex-induced vibrations may have disastrous effects in engineering practice, affecting significantly the durability, reliability and safety of engineering structures. This is a reason for which a great deal of effort has been dedicated to the proposition of control strategies to deal with the vortex-induced vibration problem. However, few works have proposed the use of viscoelastic ... ...
SAGE Publications - Tập 24 Số 13 - Trang 2688-2700 - 2018
Identification of crack location and crack size in a simply supported beam by measurement of natural frequencies In this paper, theoretical and experimental analysis of a vibrating, simply supported beam with a crack is carried out. This method is used to address the inverse problem of assessing the crack location and crack size in various beam structures. The method is based on measurement of natural frequencies, which are of global parameter and can be easily measured from any point on the structu... ...
SAGE Publications - Tập 18 Số 2 - Trang 183-190 - 2012
Modeling the Cardiac Tissue Electrode Interface Using Fractional Calculus The tissue electrode interface is common to all forms of biopotential recording (e.g., ECG, EMG, EEG) and functional electrical stimulation (e.g., pacemaker, cochlear implant, deep brain stimulation). Conventional lumped element circuit models of electrodes can be extended by generalization of the order of differentiation through modification of the defining current-voltage relationships.... ...
SAGE Publications - Tập 14 Số 9-10 - Trang 1431-1442 - 2008
The dynamic reliability analysis of pipe conveying fluid based on a refined response surface method The dynamic reliability of the pipe conveying fluid was analyzed by a refined response surface method (RSM) in this study. In the refined RSM, a new response surface expression was proposed based on functional variables with the physical characteristics of basic random variables. The sampling points were located on Gauss Hermite integration points along the coordinate axes of standard nor... ...
SAGE Publications - Tập 21 Số 4 - Trang 790-800 - 2015
Dynamic stiffness formulation for a micro beam using Timoshenko–Ehrenfest and modified couple stress theories with applications Several models within the framework of continuum mechanics have been proposed over the years to solve the free vibration problem of micro beams. Foremost amongst these are those based on non-local elasticity, classical couple stress, gradient elasticity and modified couple stress theories. Many of these models retain the basic features of the Bernoulli–Euler or Timoshenko–Ehrenfest theori... ...
SAGE Publications - Tập 29 Số 1-2 - Trang 428-439 - 2023
A state-of-the-art review of structural control systems The utilization of structural control systems for alleviating the responses of civil engineering structures, under the effects of different kinds of dynamics loadings, has become a standard technology, although there are still numerous research approaches for advancing the effectiveness of these methodologies. The aim of this article is to review the state-of-the-art technologies in struc... ...
SAGE Publications - Tập 21 Số 5 - Trang 919-937 - 2015
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