An estimation of static aerodynamic forces of box girders using computational fluid dynamics

Watanabe, Shigeru; Inoue, Hiroo; Fumoto, Koichiro

doi:10.12989/was.2004.7.1.029

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…e multisection is called by several different names as the slotted box girder [14], flat box girder [15], tandem box [16], twin box [17], and two separated steel boxes [18]. Sometimes, the multisection consists of more than two separated boxes.…”

Section: Previous Researches and The Proposed New-mentioning

confidence: 99%

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Moon

2021

Shock and Vibration

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In this study, new-type hybrid faring is suggested to improve the aerodynamic performance of the long-span cable-stayed bridge. The proposed fairing is developed by applying the concept of the multibox section to the normal faring. The proposed faring has void regions inside the faring so that wind passes through the gaps in the faring. As a result, the wind flow is changed and the forces to the bridge section are reduced. The efficiency of the proposed faring was verified by a series of wind tunnel test. From the test result, it can be found that aerodynamic performances, such as drag force and flutter resistance, are enhanced.

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Section: Previous Researches and The Proposed New-mentioning

confidence: 99%

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Moon

2021

Shock and Vibration

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“…Researchers sought methods to integrate the measured experimental data with the computation not only to enhance the calculation accuracy but also to reduce the time cost. [10][11][12][13] . Commonly, the calculation conditions are updated at time intervals based on past calculated results and measured data.…”

Section: Introductionmentioning

confidence: 99%

Integration of measurement and simulation of film pressure for estimating deformation of a glass sheet on a noncontact air conveyor

Yang¹,

Zhong²,

Wang³

et al. 2020

Mech. Eng. Sci.

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Recently, large and thin glass substrates are transported by air film conveyors to reduce surface damage. On the production line, the glass substrates are desired to be transported flatly on the conveyor to ensure the quality inspection. A method by feedbacking film pressure to the theoretical model is proposed for estimation of the deformation of the glass sheet, and the validity of the method is theoretically and experimentally verified. First, a theoretical model including the flow behavior through a porous-walled gap is established, and the film pressure distribution can be predicted by solving the model. Then, an experimental setup that can simultaneously measure the film pressure and the flatness of the glass sheet is established, and, the validity of the model is verified experimentally. Next, with the pressure points at the grooves as the boundary and the pressure points at the flange area as the feedback, an algorithm is applied to shape the one-dimensional deformation at the centerlines in accordance with a quadratic curve. Furthermore, two-dimensional deformation of the glass sheet can then be estimated by an interpolation operation. Comparisons of the calculated results with the experimental data verify the effectiveness of the estimating method.

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“…Furthermore, the numerical simulation is time-consuming and impossible for applications of real-time reproduction. In some fields, researchers have attempted to improve the calcul ation accuracy or shorten the time with the aid of experimental measurements [21][22][23][24]. The common method is to update the calculation conditions at time intervals based on past computational results and measurement data.…”

Section: Introductionmentioning

confidence: 99%

Estimation of deformation for a glass sheet on a noncontact air conveyor with film pressure feedback

Yang

Zhong

Lin

et al. 2019

Meas. Sci. Technol.

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Recently, air film conveyors equipped with porous pads have been developed to transport large, thin glass substrates in a contactless state. The deformation of the glass substrates should be monitored for the inspection process on the production line. Although laser sensors can be applied to detect the deformation along a given path, there are some problems such as poor efficiency and low real-time performance. For the purpose of estimating the deformation of the floating glass sheet indirectly, in this paper a film pressure feedback method is proposed and studied via theoretical analysis and experimental verifications. First, a theoretical model including the characteristics of the porous media and gap flow is established, and the model is solved by the finite volume method to obtain the film pressure distribution. Then, an experimental apparatus is built to measure the film pressure with different degrees of deformation of the glass sheet. Comparisons of the calculated film pressure with the measured data indicate that deviations gradually appear for the outer units as the deformation degree enlarges. Thus, we use four inner pressure points as the feedback and apply a proportionalintegral algorithm to adjust the deformation shape in terms of a quadratic curve. Furthermore, we verify the method via a deformation measurement experiment. We find that the estimation method can afford an accuracy of 3% in cases where the glass sheet is symmetrically distributed, or asymmetrically distributed but with an asymmetry coefficient of less than 0.2. Finally, we find that the realistic boundary conditions, i.e. the film pressure in the groove and the edge deflection, greatly affect the estimation results, and an allowable measurement error to ensure adequate accuracy of the estimation is provided.

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An estimation of static aerodynamic forces of box girders using computational fluid dynamics

Cited by 6 publications

References 6 publications

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Aerodynamic Characteristics Evaluation of a Cable‐Stayed Bridge Section with a New‐Type Hybrid Fairing

Integration of measurement and simulation of film pressure for estimating deformation of a glass sheet on a noncontact air conveyor

Estimation of deformation for a glass sheet on a noncontact air conveyor with film pressure feedback

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