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Younes, Mohamed Fahmy
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3D Numerical Study of Sloshing Attenuation Using Vertical Slotted Barriers

Helwan University Faculty of Engineering-Mohamed Fahmy Younes
Published 2019-07-25 by SAE International in United States
The present study deals with the reduction of fluid vibrations by dissipating the kinetic energy in a closed vibrating container partly filled using vertical slotted obstacles. The effect of the barriers on the liquid vibration inside a closed container exposed to a harmonic excitation is numerically studied. A single vertical slotted barrier (SVSB) and multivertical slotted barrier (MVSB) systems are considered for different liquid levels. The 3D liquid domain with the tank and the barrier as boundaries is modelled and solved numerically using ANSYS-CFX software. The reduction in pressures on the walls and the ceiling of the tank due to the influences of the slot size and numbers were evaluated to optimize the size and the numbers of the slots. The numerical approach shows an ability to simulate the nonlinear behavior of the liquid vibration when using vertical slotted barriers (VSB). The obtained results show that the SVSB is more efficient than the MVSB to decrease the dangers of dynamic impacts of the liquid vibrations inside the container. The system-damping factor depends mainly on the…
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Nonlinear Modelling and Parametric Study of a Sealed Tuned Liquid Column Damper for Vibration Mitigation

Helwan University Faculty of Engineering-Mohamed Fahmy Younes
Published 2019-05-16 by SAE International in United States
The main intention of the present study is to reduce unwanted vibrations of mechanical systems through a sealed tuned liquid column damper (STLCD). A nonlinear mathematical model including nonlinear hydrodynamic damping and air stiffness of the STLCD is considered to study the dynamic behaviour of a structure-STLCD system. A parametric study to investigate the effect of the main parameters of the STLCD such as length ratio and mass ratio on the dynamic behaviour of the main system is presented. The air volume at rest is considered as an additional design parameter. The results obtained showed that the efficiency and the range of application of the STLCD to control the system’s resonance vibration are more than that of the traditional one. In addition, it can be noticed that the gain in vibration mitigation from the STLCD with increase in mass ratio and length ratio higher than 7% and 0.8, respectively, is generally modest. These results enhance the actual implementation of the STLCD for small horizontal space applications. Equations for the optimum value of the initial air…
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