Active tuned liquid column damper with propellers

Chen, Yung‐Hsiang; Ko, Chia-Hao

doi:10.1002/eqe.295

Cited by 14 publications

(5 citation statements)

References 16 publications

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“…Yalla et al (2001) and Yalla and Kareem (2003) proposed an adaptive TLCD in which the size of the damper’s orifice could be adjusted to change the damping factor of TLCD, as illustrated in Figure 10(c). Chen and Ko (2003) incorporated a set of controllable propellers in TLCD and then changed the damping factor of TLCD through adjusting the rotation speed of the propellers, as illustrated in Figure 14(d). Recently, Wang et al (2005) replaced the liquid in the TLCD system with MR fluid and then changed the damping factor of TLCD system through adjusting the magnetic field around the MR fluid, as illustrated in Figure 10(e).…”

Section: Recent Development Of Tmd Designmentioning

confidence: 99%

Vibration suppression of structures using tuned mass damper technology: A state-of-the-art review

Yang

Sedaghati

Esmailzadeh

2021

Journal of Vibration and Control

132

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To date, considerable attention has been paid to the development of structural vibration suppression techniques. Among all vibration suppression devices and techniques, the tuned mass damper is one of the most promising technologies due to its mechanical simplicity, cost-effectiveness, and reliable operation. In this article, a critical review of the structural vibration suppression using tuned mass damper technology will be presented mainly focused on the following four categories: (1) tuned mass damper technology and its modifications, (2) tuned mass damper technology in discrete and continuous structures (mathematical modeling), (3) optimization procedure to obtain the optimally designed tuned mass damper system, and (4) active tuned mass damper and semi-active tuned mass damper with the practical realization of the tuned mass damper technologies.

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Section: Recent Development Of Tmd Designmentioning

confidence: 99%

Vibration suppression of structures using tuned mass damper technology: A state-of-the-art review

Yang

Sedaghati

Esmailzadeh

2021

Journal of Vibration and Control

132

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“…Such a liquid damper is also called a tuned liquid column damper (TLCD) in structural engineering. Their active control is enabled by installing propellers or pumps in the middle of the bottom tank [6][7][8]. For other floating structures, such as compliant towers, tension leg platforms, and floating production systems, the tuned mass damper (TMD), which is an auxiliary mass attached to the main structure through springs and dashpot elements, is a common vibration absorber [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Porous Media on Wave-Induced Sloshing in a Floating Tank

Tsao

Chen²,

Kees³

et al. 2022

Applied Sciences

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Placing porous media in a water tank can change the dynamic characteristics of the sloshing fluid. Its extra damping effect can mitigate sloshing and, thereby, protect the integrity of a liquefied natural gas tank. In addition, the out-of-phase sloshing force enables the water tank to serve as a dynamic vibration absorber for floating structures in the ocean environment. The influence of porous media on wave-induced sloshing fluid in a floating tank and the associated interaction with the substructure in the ambient wave field are the focus of this study. The numerical coupling algorithm includes the potential-based Eulerian–Lagrangian method for fluid simulation and the Newmark time-integration method for rigid-body dynamics. An equivalent mechanical model for the sloshing fluid in a rectangular tank subject to pitch motion is proposed and validated. In this approach, the degrees of freedom modeling of the sloshing fluid can be reduced so the numerical computation is fast and inexpensive. The results of the linear mechanical model and the nonlinear Eulerian–Lagrangian method are correlated. The dynamic interaction between the sloshing fluid and floating body is characterized. The effectiveness of the added porous media in controlling the vibration and mitigating the sloshing response is confirmed through frequency response analysis.

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“…As a more matured tuned damper, which eliminates the need for problematic installations of TMDs and rectified the substantial inactive liquid of TLDs, the tuned liquid column damper (TLCD) [8,9] is invented. A number of notable studies on TLCD may include the mathematical description of TLCDs and their optimum parameters using sinusoidal and/or random vibrations, such as [10][11][12][13][14][15][16][17][18][19], passive TLCDs, such as [20][21][22][23][24][25][26][27][28][29][30][31], and semi-active and active TLCDs, such as [32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling and optimization scheme for omnidirectional tuned liquid column dampers

Mehrkian

Altay

2020

Journal of Sound and Vibration

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As a well-known and reliable control device, tuned liquid column dampers (TLCDs) have been investigated numerically and experimentally and implemented in a number of structures over the last three decades. However, TLCDs basically suffer from the lack of multidirectionality, which is the critical need for real structures, in particular under random vibrations such as wind and earthquake excitations. This aspect has garnered the attention of the structural control community to modify this promising damper to achieve more efficiency and to extend its application range to multidirectional vibrations. This paper proposes a mathematical modeling and optimization approach for omnidirectional tuned liquid column dampers (O-TLCDs). As an improved and reformed TLCD, O-TLCDs are formed by circularly distributed of n (integer n ≥ 3) L-arms about a common joint point at the center, through which all L-arms are connected to each other. Thanks to this layout, O-TLCDs can control structures with full counteracting force capacity in all transversal directions regardless of the excitation angle of incidence. This paper, in the first step, proposes the governing equation of motion of O-TLCDs, for which Lagrange's principle is employed, and the equation of motion of the coupled O-TLCD-structure system. In doing so, a formal solution to determine the degree of freedom (DoF) of the O-TLCD is introduced, which proves independence of the O-TLCD response from the number of L-arms as well as from the angle of excitations. Second, for designing O-TLCDs, a set of design criteria and a general optimization scheme, which accommodate the online simulation of coupled O-TLCD-structure system under arbitrary excitations, are proposed. Consequently, without adding extra complication coming from extra DoFs to the motion equation of the damper, the O-TLCD functions as an enhanced liquid damper for multidirectional vibration attenuation. Next, using the O-TLCDs designed with different mass ratios, numerical simulations of O-TLCD-structure systems are conducted under seismic loads, free vibration, harmonic excitation and white noise and the controlled and uncontrolled responses of the systems are assessed in the time and the frequency domain. Here, the role of important parameters such as the mass ratio, the head loss coefficient, the liquid deflection and the excitation amplitude are evaluated and the influence of varying conditions on the efficiency of the O-TLCD are discussed. Results demonstrate that the proposed O-TLCD can be well tuned to the structure and markedly control the peak and the RMS of responses of the structure. In the end, an experimental study on a prototype O-TLCD is performed using a shaking table, which verifies the proposed mathematical modeling approach.

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Active tuned liquid column damper with propellers

Cited by 14 publications

References 16 publications

Vibration suppression of structures using tuned mass damper technology: A state-of-the-art review

Vibration suppression of structures using tuned mass damper technology: A state-of-the-art review

The Effect of Porous Media on Wave-Induced Sloshing in a Floating Tank

Mathematical modeling and optimization scheme for omnidirectional tuned liquid column dampers

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