Equivalent mechanical model for tuned liquid damper of complex tank geometry coupled to a 2D structure

Love, J.S.; Tait, Michael J.

doi:10.1002/stc.1548

Cited by 17 publications

(16 citation statements)

References 24 publications

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“…The large displacement, however, may lead to the adjacent equipment damage, because they are connected with each other by cables. In general, the tuned liquid damper (TLD) and the tuned liquid column damper (TLCD) as passive devices are capable of reducing the displacement and acceleration at the top of the structure and have been widely used for structure control. The effectiveness of TLD and TLCD in mitigating the structural vibration in engineering such as the high‐rise steel structure, the nuclear power plant, the bridge, and the jacket offshore platform had been verified.…”

Section: Introductionmentioning

confidence: 99%

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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Summary It is of great significance to conduct seismic qualification and mitigation for composite bushing, whose damage may cause massive power outage and huge cost of repair. In this paper, the annular tuned liquid damper (ATLD), utilizing the sloshing characteristics of transformer oil in the dome, is proposed to reduce the seismic responses of the composite bushing. As to the annular feature of the metallic dome, the simplified formulas for calculating the liquid sloshing frequencies in the dome are derived based on the linear wave theory, which provides a direct and fast way for the predesign of ATLD. Comparing with the experimental results reported in literature, the accuracy and applicability of the proposed formulas are verified. In addition, parametric studies of the first 3 sloshing frequencies including liquid height and the outer and the inner radii are carried out. The optimal tuning analysis of vibration reduction in frequency domain is performed on the structure base excitation. The vibration reduction analyses in time domain of the ATLD for the composite bushing subjected to real earthquake records are carried out and discussed simultaneously. It is shown that the simplified formulas presented in this paper provide a convenience for the predesign of ATLD and the optimal ATLD is effective in reducing the vibration of the composite bushing.

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Section: Introductionmentioning

confidence: 99%

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Yue

Chen

2018

Struct Control Health Monit

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“…Using a simplified experimental procedure, the proposed modeling of a coupled pendulum-slosh problem by an equivalent mechanical model was validated by experimental results and analytical solutions. In the literature, experimental investigations [3,[27][28][29][30][31][32][33][34][35] use intricate and costly techniques with lasers, video capture and/or capacitive wave sensors to acquire wave motion. For an analytical comparison, Love and Tait [34,35] compared a 2D pendulum-slosh system using an equivalent mechanical technique with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Equivalent mechanical model of rectangular container attached to a pendulum compared to experimental data and analytical solution

Morais

Lopez

Martins

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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A tuned liquid damper (TLD) is a passive control device that transfers kinetic energy from the main structure to a liquid sloshing in a tank. The mechanical description of a sloshing liquid contained in a tank requires an intricate mathematical formulation. An alternative technique describes the TLD dynamic behavior as an equivalent mechanical model comprising a series of pendulums or mass-spring systems attached to the tank walls. To validate this approach, this paper compares the discrete model to experimental results and an analytical solution for a rectangular container attached to a pendulum (pendulum-slosh problem). At first, the fundamental oscillation period of the discrete model, representing a rectangular tank, is compared to experimental data and a classic analytical solution. Finally, we compare the pendulum-slosh problem modeled as a discrete model with the analytical solution and experimental results.

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“…However, if the structural mode shapes are not collinear with the sides of the building, the principal direction of motion for the DVA and structure will be misaligned. Misalignment of structural and TLD modes may also occur if the tank shape is irregular . When structure–DVA misalignment occurs, the 2D structure–DVA system must be modelled as a coupled four‐degree‐of‐freedom system.…”

Section: Introductionmentioning

confidence: 99%

“…Misalignment of structural and TLD modes may also occur if the tank shape is irregular. [8] When structure-DVA misalignment occurs, the 2D structure-DVA system must be modelled as a coupled four-degree-of-freedom system. This geometric coupling enables vibrational energy to be transmitted from one structural mode to the perpendicular structural mode through the DVA.…”

mentioning

confidence: 99%

The performance characteristics of misaligned bidirectional dynamic vibration absorbers

Love

Tait²

2017

Struct Control Health Monit

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SummaryBidirectional dynamic vibration absorbers (DVAs) can simultaneously reduce the resonant response of two perpendicular modes of lightly damped structures. The performance of the DVA is affected if its directions of motion are not aligned with the structural modes. When the DVA is misaligned, the 2D structure-DVA system is represented as a coupled 4-degree-of-freedom system.The efficacy of a DVA is often quantified using the concept of added effective damping. Novel formulae are derived that relate the added effective damping for each structural mode to the response covariance of the structure and DVA. It is shown experimentally and numerically that these expressions can be used to determine the added effective damping of a DVA using the responses of the structure and DVA. These expressions can be used to verify the in situ performance of a DVA, which has previously been challenging to do.Lastly, contour plots are created to investigate the performance characteristics of a 2D structure-DVA system for various DVA orientation angles, structural frequency ratios, and excitation amplitudes. The influence of these parameters on the added effective damping, reduction of the resultant root mean square structural response, and correlation between the two structural responses are considered. The trends shown in these contour plots enable the possible influence of DVA misalignment to be rapidly assessed. | INTRODUCTIONTall buildings are often lightly damped, lightweight, and flexible, which can make them susceptible to excessive wind-induced dynamic motion. To enhance occupant comfort, dynamic vibration absorbers (DVAs) can be employed to increase the effective damping of the structure. Two commonly used DVAs are the tuned mass damper (TMD) and the tuned liquid damper (TLD), also known as the tuned sloshing damper. Both types of devices can be represented as an auxiliary spring-mass-dashpot system that is attached to the structure near its position of maximum modal deflection (typically at the top of the building). When the structure experiences a resonant response due to external loading, the DVA will also become excited and dissipate vibrational energy if it has the proper tuning and damping ratios. [1][2][3] The interaction between the structure and DVA results in a decrease of the structural response amplitude.

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Equivalent mechanical model for tuned liquid damper of complex tank geometry coupled to a 2D structure

Cited by 17 publications

References 24 publications

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Sloshing characteristics of annular tuned liquid damper (ATLD) for applications in composite bushings

Equivalent mechanical model of rectangular container attached to a pendulum compared to experimental data and analytical solution

The performance characteristics of misaligned bidirectional dynamic vibration absorbers

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