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Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 298-304 doi: 10.1007/s11709-007-0039-6

Abstract: The flutter control effect and mechanism of central-slotting, which have gradually been adopted in thedesign and construction of long-span bridges as an effective flutter controlling measure, were investigatedmodel tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling fluttermechanism and flutter modality of the five basic sections and their corresponding central-slotted sectionsformation and evolution of aerodynamic damping, and flutter modality especially the participation level

Keywords： aerodynamic configuration     aerodynamic performance     flutter mechanism     aerodynamic stability     theoretical    

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Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 272-278 doi: 10.1007/s11709-009-0042-1

Abstract: The concept of “generalized flutter derivative” is proposed, and its physical meaning isThe graphs of the generalized flutter derivatives of plate and Sutong Bridge section model are plottedThe characteristics of all generalized flutter derivatives are compared and analyzed, and their superioritiesThe results indicate that the physical meaning of generalized flutter derivatives are more explicit comparedthe nonlinearity properties of self-excited aerodynamic force of bridge according to the generalized flutter

Keywords： bridge     flutter derivative     generalized flutter derivative     self-excited aerodynamic force     Sutong Bridge    

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identifiedIt was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMoreover, some of the flutter derivatives of each of the other two models identified with the two methodsMore precisely, the frequency-domain method usually results in smooth curves of the flutter derivativesThe formulation of time-domain method makes the identification results of flutter derivatives relatively

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method    

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Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 46-50

Abstract: justify;">In this paper, Taizhou Bridge, a three-tower suspension bridge was investigated to discover the flutterThe assessment of flutter stability during deck construction stage was performed based on analysis ofIn the end, the assessment and management strategy of flutter stability were proposed, which can be referred

Keywords： multi tower suspension bridge     construction stage     flutter stability     management strategy    

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efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 66-89 doi: 10.1007/s11709-016-0356-8

Abstract: This paper studies optimization of three design parameters (mass ratio, frequency ratio and damping ratio) of multiple tuned mass dampers MTMDs that are applied in a cable stayed bridge excited by a strong wind using minimax optimization technique. ABAQUS finite element program is utilized to run numerical simulations with the support of MATLAB codes and Fast Fourier Transform FFT technique. The optimum values of these three parameters are validated with two benchmarks from the literature, first with Wang and coauthors and then with Lin and coauthors. The validation procedure detected a good agreement between the results. Box-Behnken experimental method is dedicated to formulate the surrogate models to represent the control efficiency of the vertical and torsional vibrations. Sobol’s sensitivity indices are calculated for the design parameters in addition to their interaction orders. The optimization results revealed better performance of the MTMDs in controlling the vertical and the torsional vibrations for higher mode shapes. Furthermore, the calculated rational effects of each design parameter facilitate to increase the control efficiency of the MTMDs in conjunction with the support of the surrogate models.

Keywords： MTMDs     power spectral density     fast Fourier transform     minimax optimization technique     Sobol’s sensitivity indices     Box-Behnken method    

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Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3,   Pages 267-273 doi: 10.1007/s11709-008-0034-6

Abstract: essentials and procedures of computational fluid dynamics (CFD) simulation applicable to evaluating flutterThe proposed methods are employed to identify flutter derivatives of the bridge deck of the Sanchaji

Keywords： discretization     computational     description     Self-anchored Suspension     simulation applicable    

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A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Engineering 2017, Volume 3, Issue 6,   Pages 823-838 doi: 10.1016/j.eng.2017.11.008

Abstract: The critical flutter velocities are also compared for the selected models under laminar flow.

Keywords： Buffeting     Flutter     Long-span bridges     Bridge aerodynamics     Bridge aeroelasticity     Erection stage    

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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: steel beams declared a safer structure against vertical and torsional vibrations and rarely expected flutter

Keywords： aeroelastic instability     structural damping     flutter wind speed     bending stiffness     torsional stiffness    

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Investigation of Turbulence Effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Hoang Trong Lam, Hiroshi Katsuchi, Hitoshi Yamada

Engineering 2017, Volume 3, Issue 6,   Pages 845-853 doi: 10.1016/j.eng.2017.10.001

Abstract:

This paper presents the flutter derivatives (FDs) extracted from a stochastic system identificationThe objective of the study is to investigate the effects of oncoming turbulence on the flutter of suspended

Keywords： Flutter derivatives     System identification     Turbulence effect     Buffeting response    

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Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 8-21

Abstract: vibration, vortex shedding vibration and control of arch bridges, and the refinements on aerodynamic flutterThe long-span cable-stayed bridges with a 1 000 m main span have high enough critical flutter speed,analysis method as 3D bridge flutter precise analysis, the bridge buffeting frequency-domain analysisunder skew wind action, the bridge flutter and buffeting reliability evaluation method based on secondmechanism and control law.

Keywords： suspension bridge     cable stayed bridge     arch bridge     flutter instability     buffeting response     vortex    

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Theory and method of mechanism system design

Huijun ZOU, Qinghua LIANG, Qing ZHANG

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 4,   Pages 399-411 doi: 10.1007/s11465-010-0116-8

Abstract: Conceptual design is the most critical and creative phase of design. Recently, increasing attention has been directed to supporting conceptual-level computer aided creative design and its theories and methodologies. Specifically, for conceptual design of mechanical products, this paper presents a novel function solving model for mechanical product design and highlights the importance of systematic synthesis to achieve creative design. Then it builds a framework as a function-effect-process-action- mechanisms (FEPAM) mapping process, which enables creative design on the basis of conceiving different action schemes. After that, several key points are elaborated including 1) representing and decomposition methods of functions and motion behaviors; 2) action scheme representing method based on network plan techniques; and 3) variation and creation methods based on action scheme transformations.

Keywords： mechanism system creative design     process model     function solving model     process action procedure     mechanismsknowledge base     principle of mechanism system composition    

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Formation mechanism and modeling of surface waviness in incremental sheet forming

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-022-0679-1

Abstract: surface quality has always been a challenge for incremental sheet forming (ISF), whereas the generation mechanismIn this paper, the formation mechanism and the prediction of waviness are both investigated through experimentsengineering application, a theoretical model for waviness height is proposed based on the generation mechanismThis work is favorable for the perfection of formation mechanism and control of surface quality in ISF

Keywords： surface waviness     incremental sheet forming     numerical simulation     formation mechanism     deformation history    

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Autogenous healing mechanism of cement-based materials

Frontiers of Structural and Civil Engineering   Pages 948-963 doi: 10.1007/s11709-023-0960-3

Abstract: However, systematic research on the autogenous healing mechanism of cement-based materials is lackingScanning electron microscopy and optical microscopy were used to examine the autogenous healing mechanism

Keywords： autogenous healing     cement-based materials     healing mechanism     aggregation effect    

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Optimal design of a linkage–cam mechanism-based redundantly actuated parallel manipulator

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 451-467 doi: 10.1007/s11465-021-0634-6

Abstract: A redundantly actuated parallel manipulator (RAPM) with mixed translational and rotational degrees of freedom (DOFs) is challenged for its dimensionally homogeneous Jacobian modeling and optimal design of architecture. In this paper, a means to achieve redundant actuation by adding kinematic constraints is introduced, which reduces the DOFs of the end-effector (EE). A generic dimensionally homogeneous Jacobian is developed for this type of RAPMs, which maps the generalized velocities of three points on the EE to the joint velocities. A new optimization algorithm derived from this dimensionally homogeneous Jacobian is proposed for the optimal design of this type of RAPMs. As an example, this paper presents a spatial RAPM involving linkages and cam mechanisms. This RAPM has 4 DOFs and 6 translational actuations. The linkage lengths and the position of the universal joints of the RAPM are optimized based on the dimensionally homogeneous Jacobian.

Keywords： redundant actuation     parallel manipulator     linkage–cam mechanism     Jacobian     optimal design    

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Cryogenic minimum quantity lubrication machining: from mechanism to application

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 649-697 doi: 10.1007/s11465-021-0654-2

Abstract: Second, the cooling–lubrication mechanism of CMQL and its influence mechanism on material hardness, cuttingThe effects of CMQL are systematically analyzed based on its mechanism and application form.

Keywords： cryogenic minimum quantity lubrication (CMQL)     cryogenic medium     processing mode     device application     mechanism    

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Title Author Date Type Operation

Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Journal Article

Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Journal Article

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Journal Article

efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Journal Article

Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Journal Article

A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Journal Article

A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Journal Article

Investigation of Turbulence Effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Hoang Trong Lam, Hiroshi Katsuchi, Hitoshi Yamada

Journal Article

Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Journal Article

Theory and method of mechanism system design

Huijun ZOU, Qinghua LIANG, Qing ZHANG

Journal Article

Formation mechanism and modeling of surface waviness in incremental sheet forming

Journal Article

Autogenous healing mechanism of cement-based materials

Journal Article

Optimal design of a linkage–cam mechanism-based redundantly actuated parallel manipulator

Journal Article

Cryogenic minimum quantity lubrication machining: from mechanism to application

Journal Article