Experimental study and mathematical modeling on the unsteady galloping of a bridge deck with open cross section

Chen, Cong; Mannini, Claudio; Bartoli, Gianni; Thiele, Klaus

doi:10.1016/j.jweia.2020.104170

Cited by 15 publications

(4 citation statements)

References 31 publications

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“…Mannini (2020) also cited unpublished papers, Chen et al (2020aChen et al ( , 2020b. The former applied the modified Tamura-Shimada model to a bridge deck with open cross-section and the latter applied the model to a rectangular cylinder with side ratio B/D = 2.…”

Section: Development Of Tamura-shimada Model For 3d Rectangular Cylin...mentioning

confidence: 99%

Mathematical models for understanding phenomena: Vortex‐induced vibrations

Tamura

2020

Japan Architectural Review

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This is a rather biased review paper emphasizing the importance of "understanding" of phenomena. This paper's purpose is to inspire young researchers to taste the real charms of research by observing the process of development of mathematical models of vortex-induced vibration phenomena of cylinders for understanding their essential mechanism. It first discusses the limitations of human abilities and important aspects of research. Then, it emphasizes the close relation between understanding and mathematical models, and five conditions for a desirable mathematical model: simplicity; inclusion of all essential properties; possession of physical meanings; wide scope of application; and possibility of development. It refers to Birkhoff's wake-oscillator (1953), Funakawa's early-wake model (1969), Nakamura's 2DOF flutter model (1970), the Hartlen-Currie model (1970), the Iwan-Blevins model (1974), Tamura's non-linear wake-oscillator model with a variable length (1979), and the Tamura-Shimada model (1987) for combined effects of vortex resonance and galloping. Some recent developments of the Tamura-Shimada model are also introduced. Then, it discusses the necessity of accurate experimental capture of early-wake behavior and the aerodynamic properties of a target cylinder in a given flow condition for further development of Tamura's model and the Tamura-Shimada model. Finally, the necessity for efforts to understand phenomena are emphasized. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Development Of Tamura-shimada Model For 3d Rectangular Cylin...mentioning

confidence: 99%

Mathematical models for understanding phenomena: Vortex‐induced vibrations

Tamura

2020

Japan Architectural Review

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“…Researchers may easily relate this phenomenon to the beat phenomenon because of their similarity in the envelope of the time-domain displacement response. As a result, nodal-shaped oscillation has been referred to as the amplitude modulation phenomenon in recent years [14,22,41].…”

Section: Mechanism Of Nodal-shaped Oscillationmentioning

confidence: 99%

“…In the above studies [1-4, 6, 7], the time-domain displacement response of the VIV of the transversely elastically supported cylinder generally exhibits a limit cycle oscillation (LCO) of equal amplitude. However, the amplitude of vortex vibrations in a few studies [5,[18][19][20][21][22][23] fluctuates greatly rather than being uniform. As early as 1968, Feng et al [5] observed gourd-shaped oscillation of small amplitude at the onset boundary of VIV and termed them as amplitude modulation phenomena (see figure 1(a)).…”

Section: Introductionmentioning

confidence: 99%

“…They found that the vibration frequency was positively correlated with the vibration amplitude during the amplitude modulation. In recent years, Mannini et al [14,22,23] studied the VIV response of some transversely elastically supported blunt bodies, including rectangular cylinders and bridge decks, in a wind tunnel. They observed that the cylinder undergoes nodal-shaped oscillation (see figure 1(b)) over a wide wind speed range where VIV occurs.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on the nodal-shaped oscillation in vortex-induced vibration of a rectangular cylinder

Lyu,

Lim,

Zhang

2023

Physics of Fluids

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This paper presents a peculiar nodal-shaped oscillation in vortex-induced vibration (VIV). This response is distinct from the commonly observed limit cycle oscillation in VIV and other aeroelastic problems. To gain insight into the dynamics in nodal-shaped oscillation, we conduct wind tunnel tests to investigate the VIV response of a freely oscillating rectangular cylinder with various transverse structural natural frequencies fs and wind speeds. The evolution of the flow field during nodal-shaped oscillation was examined using time-frequency analysis and modal analysis. During the divergent stage of the nodal-shaped oscillation, two modes, namely, the wake mode with a frequency of f = 1.28fs and the structure mode with a frequency of f = fs, were found to dominate the response of the flow. The two modes in VIV are coupled and compete with each other, diverging the oscillation of the structure. As the oscillation diverges and the amplitude increases to the maximum, the wake mode vanishes, which disengages the coupling of the fluid and structure modes. This stops the VIV and the oscillation decays until the wake mode reappears at f = 1.28fs. The above processes cycle over and over again, resulting in nodal-shaped (divergent-decay-divergent-decay) oscillation cycles. This finding explains the underlying dynamical mechanism of nodal-shaped oscillation and demonstrates the strong relationship between the wake mode and VIV.

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