SAGE Publications
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Design of Mechanical Band-Pass Filters for Energy Scavenging: Multi-Degree-of-Freedom Models
SAGE Publications - Tập 14 Số 5 - Trang 753-768 - 2008
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-of-freedom...
Non-linear Systems Under Poisson White Noise Handled by Path Integral Solution
SAGE Publications - Tập 14 Số 1-2 - Trang 35-49 - 2008
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 analytic...
Iteration Perturbation Method for Strongly Nonlinear Oscillations
SAGE Publications - Tập 7 Số 5 - Trang 631-642 - 2001
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-step ite...
Application of high-resolution spectral analysis for identifying faults in induction motors by means of sound
SAGE Publications - Tập 18 Số 11 - Trang 1585-1594 - 2012
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; with
enough ...
Dynamic stiffness formulation for a micro beam using Timoshenko–Ehrenfest and modified couple stress theories with applications
SAGE Publications - Tập 29 Số 1-2 - Trang 428-439 - 2023
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
theories, but t...
Vortex-induced vibration analysis of viscoelastically mounted rigid circular cylinders in cross-flow at a moderate Reynolds number
SAGE Publications - Tập 24 Số 13 - Trang 2688-2700 - 2018
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 materials...
Identification of crack location and crack size in a simply supported beam by measurement of natural frequencies
SAGE Publications - Tập 18 Số 2 - Trang 183-190 - 2012
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 structure.
In th...
Modeling the Cardiac Tissue Electrode Interface Using Fractional Calculus
SAGE Publications - Tập 14 Số 9-10 - Trang 1431-1442 - 2008
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. Such fra...
The dynamic reliability analysis of pipe conveying fluid based on a refined response surface method
SAGE Publications - Tập 21 Số 4 - Trang 790-800 - 2015
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 normal
rando...
Analysis and experimental study on the MAGLEV vehicle-guideway interaction based on the full-state feedback theory
SAGE Publications - Tập 21 Số 2 - Trang 408-416 - 2015
Through the theoretical analysis and experiments on the test, the levitation
control system stability of the MAGLEV vehicle on elastic track was
investigated. Firstly, taking the single magnet coupled with elastic track as
the object, the corresponding mathematical model and the real-time test platform
based on dSPACE were founded. Secondly, two kinds of the state feedback
controllers were develop...
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