A numerical study of hybrid tuned mass damper and tuned liquid damper system on structure motion control

Hsieh, Meng-Chang; Huang, Guan-Lee; Liu, Haijun; Chen, Shih-Jiun; Chen, Bang-Fuh

doi:10.1016/j.oceaneng.2021.110129

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…In previous studies it was stated the resultant force tends to decrease when the excitation frequency (ωe/ω1] was in the range 0.838-1.8. The maximum displacement of structures tends to decrease and the highest reduction of the force and displacement occurs at ωe/ω1 = 1.617 [8], see Fig. 4.…”

Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 90%

“…Fig. 4 The maximum displacement of the structure system and the resultant force acting on the structure system under various excitation frequencies [8].…”

Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 99%

“…As a non-solid particle, water has a wave frequency as a function of water depth and wave length [5,14]. When the seismic excitation happen, water will move in the reservoir which produce pressing and pulling pressure at the water reservoir walls [2,3,8].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the use of TLD will reduce the structural displacement when the natural frequency of the water tank was set equal with the external force frequency [8]. In the previous numerical simulations, the continuous water mass was lumped as an equivalent impulsive mass and a convective mass to represent the hydrodynamic pressure of the water and the maximum TLD displacement was obtained at low frequency excitation with various tanks size [6].…”

Section: Introductionmentioning

confidence: 99%

“…One of solution to obtain a structural system that has high damping is by designing the water reservoir which has the same natural frequency with the structure so that the phenomenon of resonance will be reached and give contribution to structure strength [1,8,20]. Beside that, the process of designing the water reservoir on the top of structure can be done by determining the natural frequency of structure and the ratio of water depth to length of reservoir (d/L) to obtain the optimum structure damping [7,9,18,22].…”

Section: Introductionmentioning

confidence: 99%

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The Damping Properties of a Steel Structural Model With a Box-Shaped Water Reservoir Upon Top Floor

Ramdani¹

2023

GEOMATE

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A swimming pool or a reservoir on the roof of the high-rise building may contribute to the damping behavior of the building structure underneath due to the earthquake shake. The water waves in the swimming pool due to earthquake shake produce additional force to the building due to the change of momentum and vise versa. The structure's response supporting the reservoir in the form of lateral deformation and natural frequency is highly influenced by water depth, reservoir dimensions, stiffness of the structure, and the loading patterns. There is an interaction among water waves, box-shaped reservoir, and the structural elements underneath. A study was carried out with a numerical simulation using the DualSPHysics application using a box-shaped reservoir of 200 mm long, with widths of 50 mm, 75 mm, and 100 mm. The reservoir was shaken under lateral sinusoidal forces with various frequencies to produce the maximum force on the reservoir wall. Besides that, a three-story steel structural model having dimensions of 500x500 mm floor plan and 1200 mm high was tested under free vibrations with the box-shaped reservoir as mentioned above. The numerical simulation result indicates that at d/L ratios up to 0.144, the maximum resultant force is still increasing. On the other hand, at the free vibration test of the experimental model, the optimum of damping ratios (ξ) can be indicated by the decreasing lateral amplitudes of the structural model at d/L between 0.2 and 0.4 and at about the natural frequency of the structure i.e 2.2439 Hz.

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Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 90%

“…Fig. 4 The maximum displacement of the structure system and the resultant force acting on the structure system under various excitation frequencies [8].…”

Section: Smoothed Particle Hydrodynamics (Sph)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Damping Properties of a Steel Structural Model With a Box-Shaped Water Reservoir Upon Top Floor

Ramdani¹

2023

GEOMATE

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Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

He,

Pan

2023

Earthq Engng Struct Dyn

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The recent construction of numerous offshore wind turbines (OWTs) in seismically active areas worldwide has stimulated research on seismic evaluation and vibration control design for OWTs. Unlike the onshore counterparts, the hydrodynamic effects on the seismic responses of OWTs need to be studied. Besides, the equipment in the nacelle of an OWT is highly sensitive to acceleration. Significant dynamic amplification on the nacelle under horizontal earthquake excitation can cause the malfunction of power generation and even seriously threaten the safety of OWTs. As a promising solution, tuned mass dampers (TMDs) based on the first mode of OWTs need to be tested by various earthquake excitations. In this paper, the seismic amplification effect, the hydrodynamic effects, and the vibration control by a single TMD are investigated through a series of underwater shaking table tests based on a 1:20 scaled model of a 5 MW OWT. The “no water”, “with water”, and “with water and TMD” tests are evaluated and compared. The accelerations of OWTs can be amplified or reduced by the hydrodynamic effects, depending on the natural frequencies and vibration modes of the OWT and the frequency spectrum of the seismic excitation. The earthquake‐induced hydrodynamic damping ratio and hydrodynamic added mass are carefully measured. For the TMD's effect, the single TMD performs reasonably well in seismic vibration control in most cases. Finally, the interaction between hydrodynamic effects and TMD's effect is discussed, and the hydrodynamic damping effect is suggested to be ignored when designing TMDs for OWTs.

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Seismic resilience enhancement of MDOF systems utilizing a hybrid TMD-TLD

Pandit

Malekjafarian

Farsangi

et al. 2022

Bull Earthquake Eng

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A numerical study of hybrid tuned mass damper and tuned liquid damper system on structure motion control

Cited by 18 publications

References 25 publications

The Damping Properties of a Steel Structural Model With a Box-Shaped Water Reservoir Upon Top Floor

The Damping Properties of a Steel Structural Model With a Box-Shaped Water Reservoir Upon Top Floor

Seismic responses and vibration control of offshore wind turbines considering hydrodynamic effects based on underwater shaking table tests

Seismic resilience enhancement of MDOF systems utilizing a hybrid TMD-TLD

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