Tuned Liquid Column Gas Damper in Structural Control

Hochrainer, Markus J.; Ziegler, Franz

doi:10.4018/978-1-4666-2029-2.ch007

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…CTLCD can be applied for both torsional vibration and torsionally coupled vibration. The effectiveness of CTLCD for the structural torsional response is studied by [34]. Stochastic vibration theory is applied to identify the optimal parameters of CTLCD in [35].…”

Section: Passive Devicesmentioning

confidence: 99%

Recent Advances in Bidirectional Modeling and Structural Control

Paul

2016

Shock and Vibration

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This paper provides an overview of building structure modeling and control under bidirectional seismic waves. It focuses on different types of bidirectional control devices, control strategies, and bidirectional sensors used in structural control systems. This paper also highlights the various issues like system identification techniques, the time-delay in the system, estimation of velocity and position from acceleration signals, and optimal placement of the sensors and control devices. The importance of control devices and its applications to minimize bidirectional vibrations has been illustrated. Finally, the applications of structural control systems in real buildings and their performance have been reviewed.

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Section: Passive Devicesmentioning

confidence: 99%

Recent Advances in Bidirectional Modeling and Structural Control

Paul

2016

Shock and Vibration

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“…In parallel, the attention of the structural control community has been garnered to study the mathematical description of TLCDs operating in other degrees of freedom (DoFs) than the unidirectional translational movement. Hochrainer et al [42] presented a torsional TLCD with ring-shaped geometry for controlling torsional vibrations of structures; in addition, the paper employed two other TLCDs for the horizontal translational DoFs and presented also experimental results. Similar ring-shaped geometric layout was numerically investigated for plan-asymmetric high-rise buildings exposed to an earthquake with prescribed angle of excitation [43], for simulation of a 27-story building with eccentricity under wind load [44] and for attenuation of the edgewise vibrations of wind turbine blades [45].…”

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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“…As the damping ratios of high-rise buildings are small, any wind or seismic load may act quite adversely. When designing super high-rise buildings that are greatly affected by dynamic loads, the behavior, stability, and usability should be carefully reviewed [1][2][3][4][5]. With respect to reducing the vibration responses of high-rise buildings to wind loads, methods of changing the exterior shapes of high-rise buildings [6] and methods of controlling vibrations by attaching vibration control devices have been studied.…”

Section: Introductionmentioning

confidence: 99%

A study on the wind-induced vibration response material characteristics of typical and atypical high-rise buildings according to changes in corner shapes material

Nam¹,

Paek²,

You³

et al. 2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. High-rise buildings have very slender, atypical, and lightweight shapes such that the higher they become, the more flexible they are, and it is very important to review closely the structure behavior, stability, and usability when designing ultrahigh-rise buildings with a great influence from dynamic load. Accordingly, the wind-induced vibration characteristics according to shapes and edge shape changes were experimented. The wind load spectrum, basic type showed the greatest peak value, but the corner cut reduced the magnitude of the peak. The maximum displacement response was slightly reduced in the across-wind direction and greatly reduced in the along-wind direction for A-type. For B-type, the across-wind direction showed a distribution similar to that of the corner cut model, and the along-wind direction saw similar reductions in the basic model and corner cut. The maximum displacement response value was found to be B>A(type) for across-wind direction and A >B(type) for along-wind direction.

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Tuned Liquid Column Gas Damper in Structural Control

Cited by 5 publications

References 7 publications

Recent Advances in Bidirectional Modeling and Structural Control

Recent Advances in Bidirectional Modeling and Structural Control

Mathematical modeling and optimization scheme for omnidirectional tuned liquid column dampers

A study on the wind-induced vibration response material characteristics of typical and atypical high-rise buildings according to changes in corner shapes material

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