An investigation into the bimodal flutter details based on flutter derivatives' contribution along the bridge deck's surface

Li, Ke; Li, S.; Ge, Yaojun; Yan, Bowen

doi:10.1016/j.jweia.2019.06.019

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Li et al (2019) once proposed a concept of “surface flutter derivatives” to allocate the aerodynamic characteristics to the surface of an object, but how the surrounding pressure field contributed to the flutter stability was not mentioned. Therefore, a novel concept of “pressure flutter derivatives” was proposed in this study, which was used to build a connection between the pressure field’s fluctuations and the flutter characteristics.…”

Section: Theoretical Derivationsmentioning

confidence: 99%

“…Before analyzing the influence of the wind attack angle, it is beneficial to observe the distribution of the aerodynamic stiffness and aerodynamic damping at the angle 0°, which was used as the reference for subsequent analyses. The distribution of the aerodynamic characteristics was obtained based on the method proposed by Li et al (2019). The aerodynamic characteristics were represented by the wind-induced change of the modal frequencies and modal damping ratios, namely, ω1,jU,aero, ω2,jU,aero, ξ1,jU,aero, and ξ2,jU,aero.…”

Section: Distribution Of Aerodynamic Characteristicsmentioning

confidence: 99%

“…Chen and Kareem (2006) derived closed-form solutions of the bimodal flutter, which could improve the understanding of a bimodal coupled flutter. Based on the closed-form solutions of the bimodal flutter, Li et al (2019) introduced a concept of “surface flutter derivatives” as a part of the “distributed aerodynamic characteristics” method, to analyze the contribution from the girder’s surface to the modal characteristics. Based on this method, the control mechanism of a central stabilizer was studied.…”

Section: Introductionmentioning

confidence: 99%

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The impact of the wind attack angle on a typical bridge deck’s flutter behavior by the distributed aerodynamic characteristics method

Yang

Wang

et al. 2023

Journal of Vibration and Control

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To investigate the influence of the wind attack on a bridge deck’s flutter performance, the concept of “pressure flutter derivatives” was introduced as a part of the “distributed aerodynamic characteristics” method, which can be used to visualize the dominant fluctuations of the pressure field. The distributions of the aerodynamic damping and stiffness under different wind attack angles were visualized, instead of using an overall force perspective. The analysis was carried out through two-dimensional computational fluid dynamics simulations based on a typical box deck section. Necessary data were obtained through the forced vibrations of the deck. The dominant pressure fluctuations were demonstrated, around which the wind attack angles’ impact on the Scanlan flutter derivatives was discussed. For the deck section used in this study, the wind attack angle was found to most affect the windward parts of the deck. When wind attack angle ranged from [Formula: see text] to [Formula: see text], two regions contributed the most: one located behind the windward faring vertex and the other located behind the first vertex of the upper slab. When the wind attack angle decreased to [Formula: see text], a new dominant region appeared behind the first vertex of the lower slab, which caused a sudden reduction of the flutter critical speed.

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Section: Theoretical Derivationsmentioning

confidence: 99%

Section: Distribution Of Aerodynamic Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The impact of the wind attack angle on a typical bridge deck’s flutter behavior by the distributed aerodynamic characteristics method

Yang

Wang

et al. 2023

Journal of Vibration and Control

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“…Conventionally, the motion-induced aeroelastic forces in bridges are expressed through non-dimensional “flutter derivatives” in the frequency domain or “impulse response/indicial function” in time domain (Fung, 1993; Scanlan and Tomko, 1971), among which Scanlan model has been widely accepted among all other alternate formulations (Chowdhury and Sarkar, 2003; Li et al, 2019; Wu et al, 2020). The objective of all the formulations is to identify the flutter critical wind speed ( V cr ), which is a supercritical Hopf bifurcation point.…”

Section: Introductionmentioning

confidence: 99%

Signal complexity approach based investigation of flutter instability in sectional models of bridges in wind tunnel

Keerthana

Harikrishna

2023

Advances in Structural Engineering

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Signal complexity analysis based entropy measure has been used to propose a model-free approach towards assessment of flutter critical wind speed and identification of the type of flutter in wind tunnel testing of long span bridges. The approach is based only on the measured output responses from the structure, which accounts for appropriate effects that stem from the non-linearity of the structure and fluid structure interaction. The usefulness of the proposed approach has been demonstrated with dynamic sectional models of two deck cross-sections in wind tunnel. The gain in regularity of responses on approaching the flutter critical wind speed, demonstrated with time history of responses and recurrence quantification plots, has been quantified using sample entropy. Based on the sensitivity of the sample entropy values on the embedding dimension, it has been suggested to adopt embedding dimension in the range of 2 and 5, to obtain a swift estimate of the state of the dynamic system. The proposed approach has shown potential to provide valuable insight about the flutter instability and distinguish between different types of flutter without requiring prior knowledge about the system under consideration. The study offers a promising complementary methodology to the conventional model-based approaches for evaluating flutter critical wind speed.

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“…Some research work has explored CFD simulation technology to obtain various parameters needed for bridge design. Li et al [7] introduced the concept of surface flutter derivatives in order to quantify the contributions from each part of the deck surface, distributed the changes of windinduced mode characteristics to different parts of the deck surface by further derivations based on the bimodal flutter stability expressions. The CFD simulation verified the derived formulas considering the Great Belt Bridge's deck shape and dynamic characteristics.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Based Kriging Prediction on Flutter Derivatives of Flat Steel Box Girders

Zhan

Zhang

et al. 2022

Symmetry

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An investigation on the flutter derivative prediction of flat steel box girders is carried out based on CFD simulations. Firstly, by taking the flat steel girder section of Qingshan Yangtze River Bridge as the basic section and considering its width and height as the design variables of cross-section shape, the design domain of cross-section shape is defined by controlling the possible variation range of cross-section design variables. A small number of cross-sections are selected for the calculation of aerodynamic forces by CFD simulations. Secondly, according to the aerodynamic lift and moment time-histories of these steel box girders, of which the flutter derivatives are identified by the least square method. Next, these selected cross-section shape design parameters are used as the inputs, and the flutter derivatives obtained from CFD simulations are used as the outputs to train Kriging models. To improve the prediction accuracy of Kriging models, a modified method of model training is presented. Finally, the flutter derivatives of other cross-sections in the design domain are predicted by using the trained Kriging models, and the predicted flutter derivatives are verified by CFD simulations. It is feasible to directly predict the flutter derivatives of steel box girders by Kriging models.

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An investigation into the bimodal flutter details based on flutter derivatives' contribution along the bridge deck's surface

Cited by 8 publications

References 31 publications

The impact of the wind attack angle on a typical bridge deck’s flutter behavior by the distributed aerodynamic characteristics method

The impact of the wind attack angle on a typical bridge deck’s flutter behavior by the distributed aerodynamic characteristics method

Signal complexity approach based investigation of flutter instability in sectional models of bridges in wind tunnel

Computational Fluid Dynamics Based Kriging Prediction on Flutter Derivatives of Flat Steel Box Girders

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