Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
EXPERIMENTAL STUDY OF EQUIVALENT 1DoF MAIN STRUCTURE COUPLED TO TLCD: VALIDATION OF OPTIMUM PARAMETER OBTAINED BY PARAMETRIC OPTIMIZATION
Submission Author:
Juliano Ferreira Martins , DF
Co-Authors:
Juliano Ferreira Martins, Marcus Vinicius Girão de Morais, Suzana Avila
Presenter: Juliano Ferreira Martins
doi://10.26678/ABCM.COBEM2019.COB2019-0812
Abstract
Tuned Liquid Column Damper (TLCD) is a kind of passive absorber composed by a U-shaped tube filled with liquid, commonly, water. The device has been receiving attention from several researchers as an alternative to vibration reduction. TLCD is a non-linear mechanical system due to turbulent head-loss in oscillatory conditions. To avoid solving nonlinear simultaneous equations, solutions such as statistical linearization and parameter optimization have been proposed in previous works. Besides, on its investigations, it is derived a closed-form solution for optimized TLCD damping ratio and head loss coefficient for white noise. Optimal parameters of mass and aspect ratio to control the main structure subjected to several kinds of wind random excitation are presented on literature. This study performs an experimental investigation of equivalent 1 DoF mass-spring system (main structural subsystem) coupled to a TLCD performed on the Laboratory of Dynamics of the University of Brasilia. Each subsystem is experimentally identified for determining equivalent parameters to feed reduced 2DoF coupled system (main structure + TLCD). Analytical validation of TLCD dynamic behavior is compared to experimental results. Finally, with help of response map (kind of parametric optimization), optimized parameters of TLCD are determined to obtain an expressive vibration reduction of 2DoF coupled system compared to the uncontrolled system (main structure). The preliminary data from analytical and experimental analysis of a TLCD under free vibration present great coherence.
Keywords
TLCD, vibration absorber, Passive control, Structural Vibration
