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The Effect of Connecting Bridges on Vortex-induced Vibration of Skyscrapers

Az összekötő hidak hatása a felhőkarcolók örvényleválás okozta lengésére

Építés - Építészettudomány
Authors: Mehmet Köhserli and Péter L. Várkonyi

, Haym : An Overview of Modeling and Experiments of Vortex-Induced Vibration of Circular Cylinders . Journal of Sound and Vibration ( 2005 ) 282 . 575 – 616 . Giosan , Ioan – Eng , P .: Vortex Shedding Induced Loads

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Whole-body vibration (WBV) training is a very popular kind of practice in sport, fitness and physiotherapy. This work reviews the current knowledge regarding the use and effectiveness of WBV in the physiotherapy. The discrepancies between different authors’ results are probably due to divergence in WBV training protocols. The paperwork clearly showed that despite its ultimate effects, exercises on a vibration platform are safe, feasible, and well tolerated by patients with different disorders. This narrative review should help physiotherapists verify therapy programs regarding patients’ exposure to WBV.

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The acute residual effect of whole body vibration (WBV) on upper extremity muscles and testosterone secretion was studied. Eight highly (G1), nine moderately trained gymnasts (G2) and seven physically active persons (CG) were recruited for the investigation. The intervention occurred in push-up position with the elbow flexed at 90°. G1 and G2 received 30 s, 30 Hz and 6 mm amplitude vibration repeated five times. Subjects were tested before and after one and ten minutes intervention in push-up movement. Contact time (Tc), fly time (Tf), TF/Tc ratio and impulse was measured from the ground reaction force-time curves recorded during self-selected (SSRM) and full range of motion (FRM). Testosterone level in urine was also determined. Tf increased significantly in SSRM for G1 and decreased in SSRM and FRM for G2. Tf/Tc ratio in FRM and impulse in SSRM increased significantly for G1 only. No significant alteration in testosterone level was observed. We concluded that WBV is a reasonable training modality for influencing dynamic work of upper extremity muscle, but the reaction to WBV is training and individual dependent. It seems that WBV do not influence dynamic work through increased testosterone secretion because of the relatively low mass of the involved muscles.

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The effect of short-term higher ambient temperature (HT) and continuous vibration (CV) treatment was comparatively characterized by sensory evaluation and chemical analysis. Results of quantitative descriptive analysis of modified frequency (MF) showed that HT causes both in red wine and white wine a decrease of fruity and floral characters, an unbalance of taste, and a shortness of aftertaste length. CV wine showed very close sensory characters to control in most terms evaluated. Seventy-four volatile compounds were quantitative analysed by solid phase microextractiongas chromatography-mass spectrometry, and the principal component analysis (PCA) was conducted on the 23 volatiles of highest odour activity value (OAV). The concentrations of potential fruity and floral aroma attributors like isoamyl acetate, ethyl butanoate, ethyl 2-methylbutanoate, ethyl hexanoate, ethyl octanoate, β-damascenone, and linalool were lower in HT wine than that in original wine and CV wine.

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Rao S.S. Mechanical Vibration , Addison-Wesley, Reading, MA, 1995. Rao S.S. Mechanical Vibration

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Adams, R. D. – Cawley, P. – Pye, C. J. – Stone, B. J.: A vibration technique for nondestructively assessing the integrity of structures. Journal of Mechanical Engineering Science, Vol. 20 (1978) 93

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Pollack Periodica
Authors: Mohammad Alzghoul, Sebastian Cabezas, and Attila Szilágyi

the case, which is present in many engineering applications in addition to the traditional beam configurations. Euler-Bernoulli beam theory is widely used in the analysis of the mechanical vibrations of beams. Beams are analyzed using many methods and

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Acta Alimentaria
Authors: Sz. Szélpál, Zs. Kohány, E. Fogarassy, I. Galambos, A. Koris, J. Csanádi, Gy. Vatai, and C. Hodúr

Frappart , M., Jaffrin , M.Y., Ding , L.H. & Espina , V. (2008): Effect of vibration frequency and membrane shear rate on nanofiltration of diluted milk, using a vibratory dynamic filtration system. Sep. Purif. Technol. , 62 , 212

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18 1 8 De Ketelaere, B., M. Ruiz-Altisent, E. C. Correa, J. De Baerdemaeker, P. Barreiro (2001) Reliability of vibration measurements and impact response

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References [1] Hajdu F. , Kuti R. Examination of chaotic vibrations during operation of a fire truck , Proceedings of MAC

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