Gate Vibrations due to Unstable Flow Separation

Thang, Nguyen D.

doi:10.1061/(asce)0733-9429(1990)116:3(342)

Cited by 35 publications

(18 citation statements)

References 12 publications

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“…The gate acts as a press-shut device with usually clockwise rotation (at the upper end of the excitation range the rotation may change to counterclockwise). The streamwise vibrations are excited by upstream pressure #uctuations which are caused by discharge variations related to the #ow structures travelling along the gate bottom, as suggested by Ishii & Knisely (1989, 1990.…”

Section: Excitation Mechanismmentioning

confidence: 97%

“…slightly attenuated due to energy transfer from the vertical to the horizontal response (the mechanism is not completely understood, yet Thang (1984Thang ( , 1990 and Hardwick (1974). The excitation mechanism is of a vertical ILEV-type (z-ILEV), as will be pointed out later.…”

Section: Dominant Vertical Response Rangementioning

confidence: 99%

“…Under#own gates with one degree of freedom (d.o.f.) were investigated among many others by Thang (1984Thang ( , 1990, Thang & Naudascher (1986), Hardwick (1974) and Kolkman (1976), concerning the excitation of cross-#ow (vertical) vibrations, and by Jongeling (1988), Thang (1990) and Ishii & Knisely (1989, 1990) with respect to streamwise (horizontal) vibrations. A variety of excitation mechanisms was found [see, e.g., Naudascher & Rockwell (1994)].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flow-Induced Multiple-Mode Vibrations of Gates With Submerged Discharge

Billeter

Staubli²

2000

Journal of Fluids and Structures

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Section: Excitation Mechanismmentioning

confidence: 97%

Section: Dominant Vertical Response Rangementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flow-Induced Multiple-Mode Vibrations of Gates With Submerged Discharge

Billeter

Staubli²

2000

Journal of Fluids and Structures

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“…We derive U from Δh, via (1), as is common approach (e.g. Thang, 1990). Gate vibration data (measured or calculated) may be presented in three-dimensional space, see for instance Figure 3.…”

Section: Classification Based On Reduced Flow Velocitymentioning

confidence: 99%

“…Physical model tests greatly improve principal response properties, but cannot in all cases rule out the emergence of unwanted vibrations completely (Thang 1990). The issue of FIV is sometimes underestimated or overlooked-until operational difficulties arise in the early life of the structure.…”

mentioning

confidence: 99%

Controlling flow-induced vibrations of flood barrier gates with data-driven and finite-element modelling

Erdbrink¹,

Krzhizhanovskaya²,

Sloot³

2012

Comprehensive Flood Risk Management

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ABSTRACT: Operation of flood barrier gates is sometimes hampered by flow-induced vibrations. Although the physics is understood for specific gate types, it remains challenging to judge dynamic gate behaviour for unanticipated conditions. This paper presents a hybrid modelling system for predicting vibrations by combining machine learning with physics-based modelling so that critical situations can be avoided. In the outlined data-driven approach gate response data is acquired by sensors and stored in a database. For an underflow gate under submerged flow conditions, gate opening and "reduced velocity" are the attributes for classification into safe and unsafe situations. Results from physical scale model tests are used to illustrate the proposed technique. A finite-element model for computational fluid-structure interaction simulations, presently under development, is applied to provide complementary input to the system's database. The system described in this paper contributes to safer gate control and can become a useful aid in flood barrier management.

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New insights into dynamic instability regions of spillway radial gate owing to fluid-induced parametric oscillation

Wang²

2022

Nonlinear Dyn

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Gate Vibrations due to Unstable Flow Separation

Cited by 35 publications

References 12 publications

Flow-Induced Multiple-Mode Vibrations of Gates With Submerged Discharge

Flow-Induced Multiple-Mode Vibrations of Gates With Submerged Discharge

Controlling flow-induced vibrations of flood barrier gates with data-driven and finite-element modelling

New insights into dynamic instability regions of spillway radial gate owing to fluid-induced parametric oscillation

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