TY - GEN
T1 - Use of Operational Modal Analysis to Identify Systems with Oscillatory Masses
AU - Thunbo, Lasse Førde
AU - Ørum-Nielsen, Niklas Carl
AU - Friis, Tobias
AU - Amador, Sandro D. R.
AU - Katsanos, Evangelos
AU - Brincker, Rune
PY - 2021
Y1 - 2021
N2 - Structures experience frequently moderate or even excessive structural vibrations due to their exposure to dynamic actions such as wind- and/or wave-induced loads. To mitigate the amplitude of those oscillations, passive damping systems can be used and their efficient performance is dependent on their tuning to the vibration properties of the structure, in which they have been installed. The Tuned Liquid Damper (TLD), being commonly a container including some kind of liquid, has been already used to damp excessive vibrations of different structural systems. However, there are structures that are expected to carry containers of varying size filled with liquids during their lifetime and hence, this inevitable, vibration-wise interaction between the structure and the container may eventually affect, either favorably or adversely, the structural response. The offshore platforms, being usually equipped with a tank at its top for the temporary storage of the extracted oil, constitute an example of structures with oscillatory mass at the top. Hence, it is rather appealing to investigate the dynamic behavior of this coupled system (offshore platform and the oil tank at its deck) and especially, to identify its modal properties. To do so, a thorough study, including both experimental and numerical investigation respectively, is undertaken and the robust Operational Modal Analysis is applied herein to estimate the effect of the oscillatory mass of the TLD on the dynamic properties of the offshore platform.
AB - Structures experience frequently moderate or even excessive structural vibrations due to their exposure to dynamic actions such as wind- and/or wave-induced loads. To mitigate the amplitude of those oscillations, passive damping systems can be used and their efficient performance is dependent on their tuning to the vibration properties of the structure, in which they have been installed. The Tuned Liquid Damper (TLD), being commonly a container including some kind of liquid, has been already used to damp excessive vibrations of different structural systems. However, there are structures that are expected to carry containers of varying size filled with liquids during their lifetime and hence, this inevitable, vibration-wise interaction between the structure and the container may eventually affect, either favorably or adversely, the structural response. The offshore platforms, being usually equipped with a tank at its top for the temporary storage of the extracted oil, constitute an example of structures with oscillatory mass at the top. Hence, it is rather appealing to investigate the dynamic behavior of this coupled system (offshore platform and the oil tank at its deck) and especially, to identify its modal properties. To do so, a thorough study, including both experimental and numerical investigation respectively, is undertaken and the robust Operational Modal Analysis is applied herein to estimate the effect of the oscillatory mass of the TLD on the dynamic properties of the offshore platform.
U2 - 10.1007/978-3-030-47717-2_23
DO - 10.1007/978-3-030-47717-2_23
M3 - Article in proceedings
SN - 978-3-030-47717-2
SN - 978-3-030-47716-5
T3 - Conference Proceedings of the Society for Experimental Mechanics Series
SP - 227
EP - 236
BT - Topics in Modal Analysis & Testing, Volume 8
A2 - Dilworth, Brandon
A2 - Mains, Michael
PB - Springer
CY - Cham
T2 - 38th IMAC
Y2 - 10 February 2020 through 13 February 2020
ER -