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Development of research on aerodynamics of high-speed rails in China

Tian Hongqi

Strategic Study of CAE 2015, Volume 17, Issue 4, Pages 30-29

Abstract: summarizes start， growth， accumulation， development，improvement， and leadership of the research on aerodynamicsof high-speed rails in China， which focuses on train aerodynamics， vehicle-track-bridge-tunnel couplingaerodynamics， vehicle-wind-sand-rain-snow environmental aerodynamics， pantograph-catenary aerodynamicand body aerodynamics.The paper introduces a series of experimental platforms for testing aerodynamics of high-speed rails

Keywords： rail aerodynamics； high-speed rails； experimental platforms； research development； train aerodynamics； train/tunnel coupling aerodynamics； train/wind coupling aerodynamics； pantograph-catenary aerodynamics； human aerodynamics

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Review of pantograph and catenary interaction

Weihua ZHANG, Dong ZOU, Mengying TAN, Ning ZHOU, Ruiping LI, Guiming MEI

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2, Pages 311-322 doi: 10.1007/s11465-018-0494-x

Abstract:

The application of electrified railway directly promotes relevant studies on pantograph-catenary interactionWith the increase of train running speed, the operating conditions for pantograph and catenary have becomeThis article specifically focuses on three aspects: The dynamic characteristics of the pantograph andpantograph-catenary interaction.This kind of study can be carried out by simplifying the pantograph-catenary interaction into a moving

Keywords： electrified railway pantograph and catenary interaction contact force variation moving load problem mechanical

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Operation analysis of a Chebyshev-Pantograph leg mechanism for a single DOF biped robot

Conghui LIANG, Marco CECCARELLI, Yukio TAKEDA

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4, Pages 357-370 doi: 10.1007/s11465-012-0340-5

Abstract:

In this paper, operation analysis of a Chebyshev-Pantograph leg mechanism is presented for a singleThe proposed leg mechanism is composed of a Chebyshev four-bar linkage and a pantograph mechanism.

Keywords： biped robots leg mechanisms simulation

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The key technology of testing and commissioning of high-speed railway and the main testing achievements

Kang Xiong and Yao Jianwei

Strategic Study of CAE 2015, Volume 17, Issue 4, Pages 21-29

Abstract: and commissioning of high-speed railway are analyzed from the perspective of wheel/rail interaction， pantographand ocs relation， aerodynamics of high-speed railway and train-track-bridge coupling.

Keywords： high-speed railway； system test； testing and commissioning； wheel/rail interaction； pantograph and ocsrelation； train-track-bridge； aerodynamics of high-speed railway

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The development of aerodynamics & configurationtechnology for large aircraft

Zhang Yanzhong

Strategic Study of CAE 2009, Volume 11, Issue 5, Pages 4-17

Abstract:

The paper introduced the development of aerodynamics & configurationtechnology for large aircraft.The technique of fuselage and the advanced aerodynamics configurationThe impact of aerodynamics & configuration technology on safety, economical, comfortable and environmentalcharacters for large aircraft was analyzed.The proposal for enhancing the research of aerodynamics in

Keywords： large aircraft aerodynamics super critical foil winglet laminar flow technique BWB CFD wind tunnel

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Study of the mechanics of progressive collapse of FPB isolated beam-pier substructures

Jingcai ZHANG; Yong DING; Xinchun GUAN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 6, Pages 718-728 doi: 10.1007/s11709-022-0815-3

Abstract: horizontal restraining can be reduced as large as 46% and 88% during compressive arching action (CAA) and catenary

Keywords： friction pendulum bearing progressive collapse horizontal stiffness compressive arching action catenary

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The Statics, Dynamics, and Aerodynamics of Long-Span Bridges

Yeong-Bin Yang, Yaojun Ge

Engineering 2017, Volume 3, Issue 6, doi: 10.1016/j.eng.2017.12.005

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Improvement of aerodynamic stability of suspension bridges with H-shaped simplified stiffening girder

Hiroshi KATSUCHI,Hitoshi YAMADA,Mayuko NISHIO,Yoko OKAZAKI

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1, Pages 93-102 doi: 10.1007/s11709-015-0311-0

Abstract: Wind-tunnel study on the improvement of aerodynamic stability of simplified suspension-bridge girder structures was conducted with using a 1/40-scaled section model. Objective of the study is the development of an economically superior suspension bridge with 500–1,000 m center span length. The wind-tunnel test showed that an edge-girder type cross section exhibited large amplitude torsional vortex-induced vibration as well as torsional flutter at a low wind speed. Accordingly, aerodynamic countermeasures of open grating deck and triangular faring, and structural countermeasures of center stay, diagonal bracing and mass increase were tried to improve the aerodynamic stability. Finally, feasibility of the best combination to a full-scale bridge was examined by structural analysis.

Keywords： suspension bridge aerodynamics simplified girder wind-tunnel test

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Mean wind load induced incompatibility in nonlinear aeroelastic simulations of bridge spans

Zhitian ZHANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3, Pages 605-617 doi: 10.1007/s11709-018-0499-x

Abstract: Mean wind response induced incompatibility and nonlinearity in bridge aerodynamics is discussed, where

Keywords： bridge aerodynamics nonlinear aeroelastic model Pseudo-steady mean wind loads

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Numerical Computational Aerodynamics Coefficient for Eje ction Seat

Yu Jia,Lin Guiping

Strategic Study of CAE 2007, Volume 9, Issue 6, Pages 53-57

Abstract:

The traditional method for obtaining aerodynamics coefficientTo research the feasibility of the application of computational aerodynamics coefficient for ejectionseat on general CFD software, aerodynamics coefficient of ejection seat was computed using general

Keywords： ejection seat escape system computational fluid dynamics aerodynamic coefficient

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Research Status and Development of the Bowed-Twisted Blade for Turbomachines

Wang Zhongqi,Zheng Yan

Strategic Study of CAE 2000, Volume 2, Issue 6, Pages 40-48

Abstract:

The bowed-twisted blades have been widely used in the developed countries in the 1990s, such as the USA and UK. In China, this new type blades are also successfully applied to the steam turbines, and the application of these blades to gas turbines of air-engines has had a good beginning. The effectiveness of applying the bowed-twisted blades to turbines demonstrated by the tunnel and static experiments is discussed, and the mechanism of reducing the radial-and cross-secondary flow losses by using the bowed-twisted blades is analyzed in this paper. The advances in research on compressor bowed blades and key problems in this research are considered shortly. Based on design experiences, several principles for designing stages with bowed-twisted blades are summarized in the end of this paper.

Keywords： bowed-twisted blade secondary flow cascade aerodynamics

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A New Subdiscipline of Contemporary Optics—Aero-optics

Yin Xingliang

Strategic Study of CAE 2005, Volume 7, Issue 12, Pages 1-6

Abstract:

Based on developing process of aero-optics, the background of the subject is introduced. The definition, intension, research object, research methods of the subject are proposed. The research contents are described, which include mechanism, calibration methods, calibration tests for aero-optic effects and optic window of the hypersonic aircraft. The theoretical research, engineering modeling, testing principle and testing methods in China are described in detail. Some representative results are given. At last, the application prospects and research tendency of the subject are suggested.

Keywords： aerodynamics turbulent flows optics aero-optics

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Dvelopment of Aeronautics and Astronautics With Mechanics

Chen Shilu

Strategic Study of CAE 2003, Volume 5, Issue 3, Pages 25-26

Abstract: branches of interconnected sciences in mechanics, describes the relations of flight mechanics with aerodynamics

Keywords： aerodynamics structure mechanics general mechanics automatic control flight mechanics flight dynamics

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Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations

Islam HASHEM, Aida A. HAFIZ, Mohamed H. MOHAMED

Frontiers in Energy 2022, Volume 16, Issue 4, Pages 661-682 doi: 10.1007/s11708-020-0713-0

Abstract: Wind-lens turbines (WLTs) exhibit the prospect of a higher output power and more suitability for urban areas in comparison to bare wind turbines. The wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit periphery of the shroud. Wind-lenses can boost the velocity of the incoming wind through the turbine rotor owing to the creation of a low-pressure zone downstream the flanged diffuser. In this paper, the aerodynamic performance of the wind-lens is computationally assessed using high-fidelity transient CFD simulations for shrouds with different profiles, aiming to assess the effect of change of some design parameters such as length, area ratio and flange height of the diffuser shroud on the power augmentation. The power coefficient ( ) is calculated by solving the URANS equations with the aid of the SST model. Furthermore, comparisons with experimental data for validation are accomplished to prove that the proposed methodology could be able to precisely predict the aerodynamic behavior of the wind-lens turbine. The results affirm that wind-lens with cycloidal profile yield an augmentation of about 58% increase in power coefficient compared to bare wind turbine of the same rotor swept-area. It is also emphasized that diffusers (cycloid type) of small length could achieve a twice increase in power coefficient while maintaining large flange heights.

Keywords： shroud diffuser-augmented wind turbine (DAWT) Betz limit aerodynamics computational fluid dynamics (CFD

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A prototype online database-enabled design framework for wind analysis/design of low-rise buildings

Dae Kun KWON,Ahsan KAREEM,Deepak KUMAR,Yukio TAMURA

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 1, Pages 121-130 doi: 10.1007/s11709-015-0329-3

Abstract: This study presents a development of an advanced cyberbased database-enabled design module for low-rise buildings (DEDM-LR) which provides estimation of the wind-induced responses for main wind force resisting frames by making direct use of pressure time histories measured at a large number of pressure taps over a suite of building models. These responses may be considered in lieu of code-specified load effects in which the overall accuracy may be influenced by the inherent simplifications in codes. In addition, this new automated approach is particularly attractive and advantageous as it allows a web-based online analysis/design via intuitive user-friendly interfaces for both the input and output in terms of familiar web-style forms that are nowadays very common in most of web-based services. Presently, the DEDM-LR hosts an aerodynamic database developed by the Tokyo Polytechnic University (TPU), Japan for a variety of building configurations like flat, gable, and hip roofs under suburban terrain flow condition with immediate application to other databases. The paper shows the efficacy and validity of the DEDM-LR by walking through its details and examples on selected gable-roofed buildings. The architecture of DEDM-LR platform offers the ability to pool resources by hosting other databases that may become available in the near future.

Keywords： wind loads low-rise building pressure measurement aerodynamics building design structural response building