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|Title:||Numerical Investigation of Tuned Liquid Damper Performance Attached to a Single Degree of Freedom Structure|
|Authors:||Al Jamal, Omar|
|Abstract:||Tuned liquid dampers (TLDs) are increasingly being used as dynamic vibration absorbers to minimize the vibration of structures. A tuned liquid damper is a tank filled with a liquid. When attached to a structure, the liquid sloshing action inside the TLD dampens and absorbs part of the energy given to the structure. The difficulty in designing TLDs arises from its nonlinear response (behavior), which requires a detailed understanding of the sloshing motion inside the TLD. An in-house numerical algorithm has been developed to investigate and understand liquid sloshing motion inside TLDs and to evaluate the TLD damping performance when coupled with a vibrating Single Degree of Freedom (SDOF) structure. The model is based on the finite-difference method. The Volume of Fluid method has been used to reconstruct the liquid free surface. The Continuum Surface Force model has been used to model and resolve the discontinuity accompanied with wave breaking that might take place at the liquid surface. All dynamic stresses on the free surface have been taken into consideration to evaluate wave breaking. No linearization assumptions have been used in solving the Navier-Stokes equations. The developed numerical model incorporates the interaction between the structure dynamics and the TLD. In this study, the structure has been assumed as a SDOF system and its dynamic response has been calculated using the Duhamel integral method. The model has been validated against experimental data with and without the structure. Good agreement was obtained between the numerical and the experimental results. An extensive parametric study has been carried out using the developed numerical model to investigate the effect of TLD-structure frequency ratio (fTLD/fs), external excitation amplitude-TLD length ratio (A/L) and external excitation frequency ratio (fTLD/fe) on the TLD damping performance. A new parameter defined as the Energy Dissipation Factor (EDF) has been introduced to quantify the TLD damping performance. The present results have been used to develop a useful design empirical correlation of the damping effect of the TLD as function of fTLD/fs, A/L and fTLD/fe. .|
|Appears in Collections:||Open Access Dissertations and Theses|
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