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Investigation of Parametric Resonance in Tuned Liquid Column Dampers
Author(s) -
Reiterer Michael,
Hochrainer Markus
Publication year - 2003
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200310338
Subject(s) - parametric statistics , damper , vibration , resonance (particle physics) , parametric oscillator , structural engineering , excitation , nonlinear system , work (physics) , excited state , mechanics , horizontal and vertical , engineering , physics , geology , acoustics , optics , mechanical engineering , mathematics , particle physics , quantum mechanics , geodesy , nuclear physics , statistics , electrical engineering
Tuned liquid column dampers (TLCDs) are innovative vibration absorbing devices in the low frequency range, which have been studied extensively in the last decade. Most research work focuses on the suppression of horizontal motions of structures, but there is still a demand to investigate the influence of vertical motions on the damping behavior of TLCD, especially if the absorber is attached to earthquake excited buildings or long span bridges. When considering vertical motions the TLCD dynamics becomes nonlinear and quite sensitive to parametric resonance. Consequently an unstable system might be obtained, which is dangerous for the main structure. Hence, a small‐scale model of a TLCD under both, horizontal and vertical excitation has been developed and analyzed numerically and experimentally. For this sake, a small‐scale testing facility has been constructed to perform these experimental investigations. Samples of free and electro‐dynamically forced vibration experiments with different TLCD configurations and excitation scheme has been performed. The experimental results turned out in good agreement with the theoretical predictions of the computer model and both, theoretical and experimental studies indicate that the vertical motion of a structure should be considered carefully since in case of parametric resonance it might dominate the overall dynamic behavior of TLCDs.