scholarly journals A semi-active tuned liquid column damper for lateral vibration control of high-rise structures: Theory and experimental verification

2018 ◽  
Vol 25 (12) ◽  
pp. e2270 ◽  
Author(s):  
Okyay Altay ◽  
Sven Klinkel
Keyword(s):  
Vibration Control ◽  
Experimental Verification ◽  
Liquid Column ◽  
Lateral Vibration ◽  
Tuned Liquid Column Damper ◽  
High Rise ◽  
Liquid Column Damper

scholarly journals A semi-active tuned liquid column damper for lateral vibration control of high-rise structures: Theory and experimental verification

2021 ◽  
Author(s):  
Okyay Altay ◽  
Sven Klinkel
Keyword(s):  
Vibration Control ◽  
Natural Frequency ◽  
Liquid Column ◽  
Shaking Table ◽  
Space Representation ◽  
Lateral Vibration ◽  
Engineering Structures ◽  
Tuned Liquid Column Damper ◽  
High Rise ◽  
Liquid Column Damper

This paper presents a new type of semi-active tuned liquid column damper (S-TLCD) for the lateral vibration control of high-rise civil engineering structures. Analogous to the passive tuned liquid column damper (TLCD), the S-TLCD comprises a U-shaped tank consisting of two vertical columns, which are arranged at a distance from each other and communicating through a horizontal passage. The tank is partially filled with a Newtonian fluid until the liquid reaches a certain level in the columns. In contrast to the passive TLCD, the S-TLCD provides also mechanisms for a continuous adaptation of both its natural frequency and damping behaviour in real-time. In the first part of the paper, the governing equations of the S-TLCD are derived based on the Bernoulli equation of a non-stationary incompressible liquid flow. The natural frequency of the S-TLCD is revealed to depend on the scaled length of the liquid. The scaling amount of the liquid length is formulated in dependence of the cross-sectional area ratios of the tank segments. The mathematical description of the S-TLCD is concluded by providing the state-space representation of a multi-degree-of-freedom structure with several S-TLCDs. In the second part of the paper, the derived natural frequency equation is verified and the proof of concept of the S-TLCD is shown by experimental investigations, which are performed on an S-TLCD model utilizing a test structure and shaking table tests.

Vibration Control of Ships Superstructure using Tuned Liquid Column Damper

2015 ◽  
Author(s):  
Ayaz Khan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Control ◽  
Liquid Column ◽  
Control Analysis ◽  
Structural Stiffness ◽  
Tuned Liquid Column Damper ◽  
Engine Room ◽  
Stage Analysis ◽  
Liquid Column Damper

For a direct unobstructed view over the ship bow, elevation of the bridge on top of deckhouse is required. With this deckhouse mounted over the engine room cavity, adequate structural stiffness is difficult to incorporate. The present study is intended to carry out a vibration control analysis using tuned liquid column damper (TLCD) which can be used against fore and aft vibration of superstructure. First stage analysis is done for the validation of proposed design of TLCD followed by comparative harmonic analysis of superstructure with and without TLCD, using finite element method.

Low Frequency Vibration Control of the Offshore Fixed Platforms by Using Tuned Liquid Column Damper

2014 ◽  
Author(s):  
Chan Hui Lee ◽  
Heui Won Kim ◽  
Won Ho Joo
Keyword(s):  
Vibration Control ◽  
Low Frequency ◽  
Tall Buildings ◽  
Liquid Column ◽  
Scale Model ◽  
Small Scale ◽  
Tuned Liquid Column Damper ◽  
Low Frequency Vibration ◽  
Design Variables ◽  
Liquid Column Damper

The offshore fixed platforms are confronted with greater wind and wave forces as their installation site moves toward the deep sea, so it is definitely necessary to reduce the low frequency vibration of structures for the safety and comfort of crews. The dynamic dampers are generally used to reduce vibration of structures. Especially, the tuned liquid column damper (TLCD) has been applied to reduce the low frequency vibration of onshore tall buildings. In this paper, the design procedure of TLCD is proposed to control the low frequency vibration of fixed platforms through the simulation and experiment with a small-scale model. The vibration control target is the surge motion of fixed platforms and the major design variables of TLCD are mass and damping ratios. The optimized design variables of TLCD are determined from the calculation of the amplification factor. In the experiment, the effects of mass and damping ratios are considered by changing the breadth of column, the opening ratio and number of the orifices. The results of experiment are found to well agree with the simulation. The 83% of structure vibration level can be reduced by applying the optimized TLCD.

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