This paper presents an analytical and numerical study on the dispersion properties of an Euler–Bernoulli beam immersed in a steady fluid flow with periodic arrays of airfoilshaped vibration absorbers attached to it. The resonance characteristics of the airfoils generate strong attenuation of flexural waves in the beam occurring at frequencies and numerical tools are developed to investigate the...

This paper explores the design methodology and effectiveness of small-scale magnetorheological dampers (MRDs) in applications that require rapidly variable damping. Previously applications of MRDs have been chiefly limited to vehicle shock absorbers and seismic vibration attenuators. There has been recent biomedical interest in active-damping technology, particularly in the field of rehabilitat...

In this paper, different semi-active control strategies for non-linear quarter car model equipped with controllable magneto-rheological (MR) shock absorbers and fuzzy logic controller are compared. Polynomial model is selected to characterize the experimental results of MR shock absorber. A combination of Forward Fuzzy Logic Controller (FFLC) and Inverse Fuzzy Logic Controller (IFLC) is designe...

Using metamaterial absorbers, we have shown that metallic layers in the absorbers do not necessarily constitute undesired resistive heating problem for photovoltaics. Tailoring the geometric skin depth of metals and employing the natural bulk absorbance characteristics of the semiconductors in those absorbers can enable the exchange of undesired resistive losses with the useful optical absorban...

We present results from Keck HIRES, KPNO 4m/RC Spec and HST FOS spectra of a low-redshift, close QSO pair and a close, higher-redshift QSO triplet in order to explore the size evolution, shape and clustering of Ly α absorbers. The results we highlight here indicate that there is no strong evidence for evolution of Ly α cloud size with redshift, that strong (Wo > 0.4Å) Ly α forest absorbers are ...

Abstract Recently, vibration control has been useful in various engineering fields such as aerospace, adaptive dynamic absorbers, and infrastructure. Magnetorheological elastomer (MRE) is an interesting material for controlling suppressing undesirable vibrations through the application of a magnetic field. The present study aims at analyzing pre-structure magnetorheological viscoelastic core re...

The automotive industry uses centrifugal pendulum vibration absorbers (CPVAs) to reduce vibrations of the transmission system. These passive devices are made several masses oscillating along a given path relative rotor. This work addresses recent design CPVA, in which pendulums allowed rotate relatively dynamic stability this CPVA and shifting its operating point investigated paper. two aspects...