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aerodynamic interference effects and mitigation measures on vortex-induced vibrations of two adjacent cable-stayed bridges

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Frontiers of Structural and Civil Engineering 2011年第4期5卷 510-517页

作者： Xiaoliang MENG Ledong ZHU Zhenshan GUO State Key Laboratory for Disaster Reduction in Civil Engineering Department of Bridge EngineeringTongji UniversityShanghai 200092China Key Laboratory for Wind Resistance Technology of Bridges Department of Bridge EngineeringShanghai 200092China

By examining the two neighboring Haihe Bridges with semi-and full-closed bridge decks,the aerodynamic interference between the two decks on the vortex-induced vibration(VIV)and the corresponding aerodynamic mitigation measures are investigated via a series of wind tunnel tests with a spring-suspended sectional model aided with computational fluid dynamics(CFD)*** results show that the VIV responses of both bridges can be significantly affected by the aerodynamic interference and that the extent of the influence varies with the shapes of the windward and leeward *** VIV amplitudes of the windward bridge are often fairly close to those of the single ***,those of the leeward bridge are magnified substantially by aerodynamic interference if the same structural and aerodynamic configurations are adopted for the two ***,the VIV responses are not significantly increased and may even be reduced by the aerodynamic interference if different configurations are employed for the two ***,an effective combined measure of adding wind barriers and sharpening the wind fairing noses of the two box decks is presented for mitigating both the vertical and torsional VIV responses of the windward and leeward bridges.

关键词： separated parallel decks vortex-induced vibration aerodynamic interference aerodynamic mitigation measure semi-closed box deck full-closed box deck

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aerodynamic interference effects between a triple-box girder and trains on aerodynamic forces and vortex-induced vibration

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Journal of Central South University 2022年第8期29卷 2532-2541页

作者： YANG Ling-bo HUA Xu-gang WANG Chao-qun HE Dong-sheng CHEN Zheng-qing Key Laboratory forWind and Bridge Engineering of Hunan Province Hunan UniversityChangsha 410082China China Railway Major Bridge Reconnaissance&Design Institute Co. Ltd.Wuhan 430050China

Wind tunnel tests were carried out to investigate the aerodynamic interference between a triple-box girder and trains,involving static aerodynamic forces and vortex-induced vibrations(VIVs).Static and dynamic sectional models of the girder and trains were employed for aerodynamic force measurement and VIV test,*** indicate that the aerodynamic interference effect on static aerodynamic forces of both the girder and trains is *** a single train exists,the horizontal position of the train has a small effect on aerodynamic coefficients of the *** two trains meet on the girder,the drag coefficient of the girder is significantly reduced compared with that of without train or with a single train;besides,during the whole meeting process,aerodynamic forces of the leeward train first drop and then increase *** fluctuation of aerodynamic force could cause redundant vibration of the train,which is unfavorable for safety and comfort.A train on the girder could worsen the girder VIV performance:a new vertical VIV appears in the triple-box girder when a train is on the girder,and the torsional VIV amplitude increases significantly when the train is on the windward side.

关键词： triple-box girder wind tunnel test train-girder system aerodynamic interference vortex-induced vibration

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Numerical Analysis on aerodynamic interference of a Novel Tilt-rotor UAV in Transition Mode

Numerical Analysis on Aerodynamic Interference of a Novel Ti...

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第三十九届中国控制会议

作者： Huaping Huang Guang He Li Yu Xiangke Wang College of Intelligence Science and Technology National University of Defense Technology

In order to investigate the aerodynamic interference of a novel tilt-rotor UAV in transition mode more effectively,numerical analysis based on CFD（Computational Fluid Dynamics） is completed in this paper. Firstly, the model of the designed UAV is introduced. For the simulations, the hybrid grid method is used to establish the UAV and background grid, the S-A（Spalart-Allmaras） model is used as the model of air, and the MRF（Multiple Reference Frame） method is used to establish the rotor model. Based on the above methods, the flow fi elds of ti lt-rotor UAV in tr ansition mo de ar e si mulated wi th threedimensional Navier-Stokes equations. Furthermore, comparisons between simulations and experiments are made to demonstrate the reliability of the proposed CFD method in simulating the flow fields of tilt-rotor UAV. After the establishment and verification of the CFD method. The analysis of the tilting curve is made to provide the method to organize the numerical simulation. By analysis and comparisons on the results of numerical simulation, some meaningful conclusions about aerodynamic interference caused by rotor/wing in the transition mode are obtained.

关键词： Tilt-rotor UAV Transition mode CFD aerodynamic interference

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Research status and prospect of wind-vehicle-bridge coupling vibration system

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第3期9卷 319-338页

作者： Wanshui Han Xiaodong Liu Xuelian Guo Shizhi Chen Gan Yang Huanju Liu School of Highway Chang'an UniversityXian 710064China Department of Civil and Environment Engineering University of CaliforniaLos AngelesCA 90015USA School of Civil Engineering Hebei University of EngineeringHandan 056038China

To promote and develop the theoretical basis and application of the wind-vehicle-bridge coupling vibration system,the corresponding research status and prospects are reviewed and discussed from five aspects,i.e.,the analytical framework,the aerodynamic interference,the evaluation criteria,the design loads of long-span bridge and the double-deck railcum-road *** refining process of analysis system is reviewed from the aspects of simulation wind load,vehicle load and bridge structure,and the corresponding coupling *** aerodynamic interference,the development process is summarized from the simulative precision of the elements(wind,vehicle and bridge),the load cases and the object of *** evaluation criteria,the corresponding development course is summarized from the certain evaluation method to uncertain *** long-span bridge design load,the wind and vehicle loads are reviewed and summarized from current multinational codes and theoretical *** double-deck rail-cum-road bridge,the mechanism of multi-element coupling relationship and corresponding aerodynamic interference are both *** comprehensive review and summary,the analytical framework is in the process from simplification to *** simulation and consideration of the objects of structural interference gradually become *** corresponding simulation theory,wind tunnel scale,test equipment and technology are the key factors to limit its *** systematic evaluation of vehicle and bridge,the structural and systemic security are the basis of the evaluation,and the auxiliary components and functional evaluation need to be paid more *** evaluation criterion will be developed from certain method to reliability *** design load of long-span bridge,the vehicle load is gradually transferred from the simple application of the design load of small-medium span bridge into a complex model considering the load *** doubl

关键词： Bridge engineering Wind-vehicle-bridge coupling vibration aerodynamic interference Double-deck rail-cum-road bridge Design loads of long-span bridges Evaluation rule

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TRANSONIC WALL IN TERFERENCE CORRECTIONS FOR CIVIL AIRCRAFT MODEL TESTS

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Chinese Journal of Aeronautics 1994年第3期7卷 160-169页

作者： Fan Zhaolin Cui Naiming Yun Qilin Yin Lupin(China aerodynamics Research & Development Center,Mianyang, Sichuan, China, 621000)

The correction method uses the static pressures measured near the tunnelwalls during model tests as boundary conditions. It is required that the flow near thewalls is subsonic and the freestream Mach number is less than 1. It is still valid whenthere are shock waves and supersonic pockets near the model as long as shock waves donot extend to walls, and the method is applicable to various ventilated wall or solid walltest sections. Corrections for three models tested abroad are in quite good agreementwith NASA's results, which are obtained by a nonhnear correction method. Thepresnet method has been apphed to B737 inodel tcsted in CARDC 1.2 m wind *** results show that this method is suitable for transonic wall interference correctionfor high aspect ratio airplane tests.

关键词： aerodynamic interference transonic wind tunnels wall pressure. data reduction

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