Article history: Received: 19.05.2014. Received in revised form: 13.08.2014. Accepted: 27.08.2014. This paper reports a novel control strategy combined with artificial intelligence for windinduced vibration control of a high-rise structure and also provides a broader idea for traditional structural vibration control. The fast Fourier transform based on decimation-in-time was used to optimize th...

The aim of this paper is to investigate the effect of time delays on the stability of a zero-placement position and velocity feedback law for a vibratory system comprising harmonic excitation equipped with an electromagnetic active tuned mass damper (ATMD). The purpose of the active control is broadening the vibration attenuation envelope of a primary mass to a higher frequency region identifie...

Floating offshore wind turbines are a promising technology for addressing energy needs by utilizing resources offshore. The current state of the art is based on heavy, expensive platforms to survive ocean environment. Typical design techniques do not involve optimization because computationally time domain solvers used model motions and loads in However, this uses an efficient frequency solver ...

Uniform liquid-chromatographic conditions were developed such that we could quantify norepinephrine, epinephrine, normetanephrine, metanephrine, vanillylmandelic acid, and 5-hydroxyindoleacetic acid in urine by using a single mobile phase of monochloroacetic acid and citric acid, 0.1 mol/L each. All compounds were separated on a C18 column and detected electrochemically at a potential of +0.800...

Whenever a tuned-mass damper is attached to a primary system, motion of the absorber body in more than one degree of freedom (DOF) relative to the primary system can be used to attenuate vibration of the primary system. In this paper, we propose that more than one mode of vibration of an absorber body relative to a primary system be tuned to suppress single-mode vibration of a primary system. W...

The present paper deals with the optimisation of a hybrid Tuned Mass Damper (TMD) in reducing the transient structural response due to impulse loading. In particular, a unit impulse excitation has been assumed, acting as base displacement, which is a situation that may occur in different real applications. The proposed hybrid Tuned Mass Damper is composed of a previously optimised passive TMD a...

Experiments and CFD-PBM simulation were performed in this study to investigate the effects of helically-finned tube (HFT) internals on gas-liquid flow a laboratory-scale bubble column. Hydrodynamic parameters, including gas holdup, size field as well turbulence properties, compared for an empty column other two columns with bare-tube (BT) or HFT internals. We found that bare rods promote stabil...

This study aims to develop a knee-brace friction damper for mid-rise timber frame buildings. First, time history seismic response analysis was conducted investigate the performance of improve four-story building. Then, static cyclic loading test on beam-column joint with/without prototype carried out verify effectiveness damper. It is found that mitigates slip behavior and increases equivalent ...

A viscous liquid film coating a fibre becomes unstable and decays into droplets due to the Rayleigh-Plateau instability (RPI). Here, we report on the generation of uniform droplets on a hydrophobized fibre by taking advantage of this effect. In the late stages of liquid column breakup, a three-phase contact line can be formed at one side of the droplet by spontaneous rupture of the thinning fil...