Yazar "Aydin, Ahmet" seçeneğine göre listele

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    Effect of Viscous Damping Coefficient on Suppression of Structural Earthquake-Induced Vibrations with Tuned Liquid Column Dampers
    (Institute of Electrical and Electronics Engineers Inc., 2023) Serbes, Sefer Arda; Kemerli, Muaz; Aydin, Ahmet; Inanir, Muhammed Necmeddin Sami; Engin, Tahsin
    In this study, the effect of viscous damping coefficient of the liquid in Tuned Liquid Column Damper (TLCD) & structural systems under harmonic excitation was numerically investigated. The system under consideration is a TLCD-equipped structural system being manufactured for research purposes at Sakarya University's SARGEM research center for shaking tests. The parameters of this system were used as a reference in the numerical solution of the mathematical model using the 4th-order Runge-Kutta method, and the accuracy of the solution was verified with the MATLAB - SIMULINK toolbox. Subsequently, structural damping was addressed through dimensionless parameters commonly used in the study of TLCD-equipped structural systems: mass ratio, length ratio, and dimensionless excitation frequency. Two other dimensionless parameters related to displacement were derived as an evaluation criteria. The variation on these two parameters depending on the TLCD design was examined using the numerical solution code. The optimum design conditions of the TLCD are evaluated for an effective damping. © 2023 IEEE.
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    Öğe
    Experimental and Numerical Investigation of the Mitigation of Structural Vibrations Caused by Ground Acceleration with TLCD Application
    (Institute of Electrical and Electronics Engineers Inc., 2023) Serbes, Sefer Arda; Dal, Huseyin; Inanir, Muhammed Necmeddin Sami; Kemerli, Muaz; Aydin, Ahmet; Celebi, Erkan; Engin, Tahsin
    In this study, the application of a Tuned Liquid Column Damper (TLCD) for the mitigation of vibrations in buildings were numerically and experimentally investigated. For this purpose, a frequency-matched signle story model of a structure of an 8-story building and a corresponding TLCD model were designed and manufactured. The stiffness coefficient was determined through the free vibration tests. The structure with and without TLCD were subjected to free and harmonic vibrations in the 0-1 Hz frequency range using a six-degree-of-freedom shaking table. For numerical analysis, the nonlinear mathematical model of the system was established and solved using the 4th-order Runge-Kutta method. The accuracy of the mathematical model was demonstrated by comparing the experimental and numerical results. The analyses revealed that the application of TLCD is effective in reducing structural vibrations. © 2023 IEEE.
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    Öğe
    The Fluid Behavior of a Non-Orifice TLCD under Harmonic Excitation: From Experiments to Analytical Solution
    (Mdpi, 2024) Serbes, Sefer Arda; Engin, Tahsin; Kemerli, Muaz; Kayrakoglu, Egemen; Aydin, Ahmet
    Tuned liquid column damper (TLCD) is a well-known liquid damper designed to absorb the vibration of structures used in many applications, such as high-story buildings, wind turbines, and offshore platforms, requiring an accurate mathematical determination of the liquid level to model the TLCD structure system motion. The mathematical model of a TLCD is a nonlinear ordinary differential equation, unlike the structure, due to the term containing a viscous damping coefficient, and cannot be solved analytically. In this study, the fluid behavior of a TLCD without an orifice, directly connected to a shaking table under harmonic excitation, was investigated experimentally and a new linearization coefficient was proposed to be used in the mathematical model. First, the nonlinear mathematical model was transformed to a nondimensional form to better analyze the parameter relations, focusing on the steady-state amplitude of the liquid level during the harmonic excitation. The experimental data were then processed using the fourth-order Runge-Kutta method, and a correlation to calculate the viscous damping coefficient was proposed in the dimensionless form. Accordingly, a novel empirical model was proposed for the dimensionless steady-state amplitude of the liquid level using this correlation. Finally, with the help of the proposed correlation and the empirical model, an original linearization coefficient was introduced which does not need experimental data. The nonlinear mathematical model was linearized by using the developed linearization coefficient and solved analytically using the Laplace transform method. The study presents a generalized method for the analytical determination of the liquid level in a non-orifice TLCD under harmonic excitation, using a correlation and an empirical model proposed for the first time in this study, providing a novel and simple solution to be used in the examination of various TLCD structure systems.