Coupled mode flutter analysis using flutter derivatives

Tanaka, Hiroshi; Yamamura, Nobumichi; Tatsumi, Masaaki

doi:10.1016/0167-6105(92)90135-w

Cited by 24 publications

(4 citation statements)

References 2 publications

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“…The findings contribute to the understanding and mitigation of dynamic instability in the design and maintenance of suspension bridges. Tanaka et al [25] this study focuses on the coupled mode flutter analysis of structures using flutter derivatives. The authors investigate the phenomenon of coupled mode flutter, which involves the interaction between different vibration modes of a structure.…”

Section: State Of Developmentmentioning

confidence: 99%

Wind Induced Vibrations on Long Span Bridges

2023

IRJMETS

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This research paper aims to investigate the phenomenon of wind-induced vibrations on long-span bridges and propose mitigation strategies to enhance the safety and performance of these structures. The study begins by examining the fundamental concepts of aerodynamics and fluid-structure interaction, providing a theoretical foundation for understanding the complex interaction between wind and bridge structures. Various factors influencing wind-induced vibrations, such as wind speed, bridge geometry, and structural damping, are explored through analytical and numerical modelling techniques. The research identifies common vibration modes such as Vortex induced vibrations (VIV), Flutters, galloping, buffeting and critical wind speeds that trigger resonant responses in long-span bridges. It also evaluates the effectiveness of different control measures, including passive and active damping systems, to mitigate wind-induced vibrations. Computational simulations are utilized to optimize the design parameters of these control strategies.

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Section: State Of Developmentmentioning

confidence: 99%

Wind Induced Vibrations on Long Span Bridges

2023

IRJMETS

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“…However, it is essentially an improved quantitative frequency coincidence theory and may not be available in the damping dominant flutter. In eigenvector perspective, otherwise, Tanaka et al (1992) define the flutter derivatives to describe the self-excited forces and identify the flutter characteristic of a long-span bridges by flutter derivatives. Yang et al (2009) locate the flutter determinant quantitatively using flutter eigenvector relationship between different modes.…”

Section: Introductionmentioning

confidence: 99%

CFD-based time-domain aeroelastic simulations of a twin-fudelage aircraft

Wang

Liu

Guo

et al. 2022

AEAT

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Purpose The purpose of this paper is to introduce a novel method to study the flutter coupling mechanism of the twin-fuselage aircraft, which is becoming a popular transportation vehicle recently. Design/methodology/approach A new method of flutter mode indicator is proposed based on the principle of work and power, which is realized through energy accumulation of generalized force work on generalized coordinates, based on which flutter coupling mechanism of the twin-fuselage aircraft is studied using ground vibration test and computational fluid dynamics/computational solid dynamics method. Findings Verification of the proposed flutter mode indicator is provided, by which the flutter mechanism of the twin fuselage is found as the horizontal tail’s torsion coupled with its bending effect and the “frequency drifting” phenomenon of twin-fuselage aircraft is explained logically, highlighting the proposed method in this paper. Originality/value This paper proposed a new method of flutter mode indicator, which has advantages in flutter modes indexes reliability, clear physical meaning and results normalization. This study found the flutter coupling mechanism of twin-fuselage aircraft, which has important guiding significance to the development of twin-fuselage aircraft.

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“…However, the mode superposition method is commonly used due to its accuracy and efficiency. Jones and Scanlan [4], Jain [5], and Tanaka [6] utilized the determinant search method directly to predict the bridge flutter critical condition. In recent years, with the development of 2 Mathematical Problems in Engineering computers, numerical simulation studies are widely used in flutter analysis.…”

Section: Introductionmentioning

confidence: 99%

Flutter Performance of the Emergency Bridge with New‐Type Cable‐Girder

Yang

Shao

et al. 2019

Mathematical Problems in Engineering

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Based on the proposed emergency bridge scheme, the flutter performance of the emergency bridge with the new-type cable-girder has been investigated through wind tunnel tests and numerical simulation analyses. Four aerodynamic optimization schemes have been developed in consideration of structure characteristics of the emergency bridge. The flutter performances of the aerodynamic optimization schemes have been investigated. The flutter derivatives of four aerodynamic optimization schemes have been analyzed. According to the results, the optimal scheme has been determined. Based on flutter theory of bridge, the differential equations of flutter of the emergency bridge with new-type cable-girder have been established. Iterative method has been used for solving the differential equations. The flutter analysis program has been compiled using the APDL language in ANSYS, and the bridge flutter critical wind speed of the optimal scheme has been determined by the program. The flutter analysis program has also been used to determine the bridge flutter critical wind speed of different wind-resistance cable schemes. The results indicate that the bridge flutter critical wind speed of the original emergency bridge scheme is lower than the flutter checking wind speed. The aerodynamic combined measurements of central-slotted and wind fairing are the optimal scheme, with the safety coefficients larger than 1.2 at the wind attack angles of −3°, 0°, and +3°. The bridge flutter critical wind speed of the optimal scheme has been determined using the flutter analysis program, and the numerical results agree well with the wind tunnel test results. The wind-resistance cable scheme of 90° is the optimal wind cable scheme, and the bridge flutter critical wind speed increased 31.4%. However, in consideration of the convenience in construction and the effectiveness in erection, the scheme of wind-resistance cable in the horizontal direction has been selected to be used in the emergency bridge with new-type cable-girder.

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Coupled mode flutter analysis using flutter derivatives

Cited by 24 publications

References 2 publications

Wind Induced Vibrations on Long Span Bridges

Wind Induced Vibrations on Long Span Bridges

CFD-based time-domain aeroelastic simulations of a twin-fudelage aircraft

Flutter Performance of the Emergency Bridge with New‐Type Cable‐Girder

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