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M. Reiterer, M.J. Hochrainer:
"INVESTIGATION OF PARAMETRIC RESONANCE ON TUNED LIQUID COLUMN DAMPER";
PAMM - Proceedings in Applied Mathematics and Mechanics (invited), 3 (2003), 122 - 123.

Tuned liquid column damper (TLCD) are innovative vibration absorbing devices, which have been studied extensively in the last decade. Most research work is focused on the suppression of horizontal motions of structures, but there is still a demand to investigate the influence of vertical vibrations on the damping behavior of TLCD, especially if the absorber is attached to earthquake excited buildings or vibrating bridges. When considering vertical motion the TLCD dynamics becomes nonlinear and sensitive to parametric resonance. Consequently an unstable system might be obtained, which is dangerous for the main structure. A mathematical model of tuned liquid column damper under both, horizontal and vertical excitation is developed and analyzed numerically. Furthermore a small scale testing facility has been developed to perform experimental investigations. A series of free and forced vibration experiments with different TLCD configurations and excitation schemes is performed. The experimental results are in good accordance with the theoretical predictions and both, theoretical and experimental studies indicate that the vertical motion of a structure should be considered since in case of parametric resonance it might dominate the overall dynamic behavior of tuned liquid column damper.

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