The dynamic responses of membrane are completely dependent on Pre-tensioned forces which are applied over a boundary of arbitrary curvilinear shape. In most practical cases, the dynamic responses of membrane structures are undesirable. Whilst they can be designed as vibration-based energy harvesters. In this paper a smart flat membrane sheet (SFMS) model for vibration-based energy harvester is ...

The heads of live spermatozoa of the sea urchin Hemicentrotus pulcherrimus were held by suction in the tip of a micropipette mounted on a piezoelectric device and vibrated either laterally or axially with respect to the head axis. Within certain ranges of frequency and amplitude, lateral vibration of the pipette brought about a stable rhythmic beating of the flagella in the plane of vibration, ...

Pipe vibration is often excited in the deep ocean by ship motions, wave forces and vortex shedding. Elastic joints along the pipe are modeled in an attempt to move the resonance frequencies away from the pipe system. The numerical examples focus on the investigation of single and multiple elastic joints along a long pipe and their effect on three-dimensional (3-D) nonlinear coupled pipe respons...

in this paper effects of fractured sleepers on rail track vibration under moving wheelset have been investigated. two parallel rails of the track have been modeled as euler-bernoulli beams on elastic points as rail pads. also sleepers have been modeled as visco-elastic euler-bernoulli beams. it is assumed that, some sleepers under the rail track have been fractured and modeled by two beams. the...

The present study investigates the axial vibration of double-walled nanotubes. Using nanorod continuum model with van der Waals effect, vibrational frequencies are studied. Aydogdu (Journal Vibration and Control, Vol. 21, Issue 16, (2015), 3132-3154) proposed a reliable for in nanotube. This provided detailed investigation using effects. But sometimes, wrong equation might lead to erroneous sci...

Machine tool rams are important constructional elements found on vertical lathes as well many other machines. In most cases, a machine ram constitutes an assembly with significant dynamic compliance that affects the machine’s ability to achieve stable cutting conditions. There various solutions for increasing ram’s stiffness and damping. This paper describes innovative concept of two-axial elec...

Abstract Based on the Bernoulli–Euler theory, vibration characteristics of a clamped-elastic pinned beam under elastic constraint and compressive axial loads are derived verified by finite element method. The results examples show that natural frequency decreases with increase increases stiffness. When stiffness from 10 4 to 8 N/m, first-order becomes 4.24 times, second-order 2.19 third-order 1...