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Research Papers

The Influence of Tank Orientation Angle on a 2D Structure-Tuned Liquid Damper System

[+] Author and Article Information
J. S. Love

Project Scientist
RWDI Inc.,
650 Woodlawn Road West,
Guelph, ON, N1K 1B8, Canada
e-mail: Shayne.Love@rwdi.com

M. J. Tait

Associate Professor
Department of Civil Engineering,
McMaster University,
1280 Main Street West,
Hamilton, ON, L8S 4L7, Canada

1Corresponding author.

Contributed by the Design Engineering Division of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received September 24, 2011; final manuscript received May 12, 2012; published online February 4, 2013. Assoc. Editor: Massimo Ruzzene.

J. Vib. Acoust 135(1), 011010 (Feb 04, 2013) (11 pages) Paper No: VIB-11-1219; doi: 10.1115/1.4007416 History: Received September 24, 2011; Revised May 12, 2012

Tuned liquid dampers (TLDs) utilize sloshing fluid to absorb and dissipate structural vibrational energy, thereby reducing wind induced dynamic motion. By selecting the appropriate tank length, width, and fluid depth, a rectangular TLD can control two structural sway modes simultaneously if the TLD tank is aligned with the principal axes of the structure. This study considers the influence of the TLD tank orientation on the behavior of a 2D structure-TLD system. The sloshing fluid is represented using a linearized equivalent mechanical model. The mechanical model is coupled to a 2D structure at an angle with respect to the principal axes of the structure. Equations of motion for the system are developed using Lagrange’s equation. If the TLD and structure are not aligned, the system responds as a coupled four degree of freedom system. The proposed model is validated by conducting structure-TLD system tests. The predicted and experimental structural displacements and fluid response are in agreement. An approximate method is developed to provide an initial estimate of the structural response based on an effective mass ratio. The results of this study show that for small TLD orientation angles, the performance of the TLD is insensitive to TLD orientation.

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Figures

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Fig. 2

Representation of structure-TLD system when TLD is not aligned with structure principal axes

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Fig. 3

Setup of system tests

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Fig. 4

Wave probe locations within tank (dimensions in mm)

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Fig. 5

Frequency response of structural displacement (0deg2D)

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Fig. 6

Frequency response of structural displacement (10deg1D)

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Fig. 7

Frequency response of wave heights (10deg1D)

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Fig. 8

Frequency response of structural displacement (30deg1D)

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Fig. 9

Frequency response plots of wave heights (30deg1D)

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Fig. 10

Frequency response of structural displacement (30deg2D)

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Fig. 11

Frequency response of structural displacement (30deg1DHar)

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Fig. 12

Frequency response of filtered wave heights (30deg1DHar)

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Fig. 13

Total RMS structural response as function of TLD orientation (a) system A (b) system B

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Fig. 14

Structural response versus TLD orientation predicted using mechanical model and effective mass ratio approximate method (excitation: σF-target) (a) system A (b) system B

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