Journal articles: 'Buffeting response'

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Zuo, Leibin, Qinfeng Li, Cunming Ma, Li Yadong, and Chuanchuan Hu. "Analysis of Span-Directional Coherence Function and Buffeting Response of a Long-Span Natural Gas Pipeline Suspension Bridge under a Turbulent Wind Field." Journal of Sensors 2022 (September 19, 2022): 1–17. http://dx.doi.org/10.1155/2022/5381511.

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A long-span natural gas pipeline suspension bridge is prone to buffeting under the action of a turbulent wind field. In order to accurately calculate the buffeting response of the structure under a turbulent wind field, the 1 : 15 segment model wind tunnel test is used to obtain the aerodynamic coefficient and flutter derivative of the bridge deck structure. According to the test results, the buffeting force coherence functions under five different span-directional spacing are fitted. The results show that the buffeting force coherence function corresponding to different wind attack angles has a peak at the corresponding wing grid vibration frequency in the low-frequency region; when the spacing increases to r = 0.51 m or above, the amplitude of coherence function decreases significantly; for the spacing of r = 0.17 m , the buffeting force coherence functions in different directions are obviously different but the corresponding coherence functions of resistance, lift, and torque show a similar curve trend between different wind attack angles. Based on the Scanlan buffeting force correction model, the buffeting response under the reference wind speed of 30.1 m/s is analyzed in the frequency domain and compared with the wind tunnel test results of the whole bridge. The results show that the buffeting response calculated in this paper is in good agreement with the wind tunnel test results of the whole bridge and the buffeting response law is consistent. The maximum value of vertical buffeting response is located near the 1/4 span, and the maximum values of lateral and torsional response are located in the middle of the span. The lateral buffeting displacement response is significantly greater than the vertical buffeting displacement response. Under different wind attack angles, the vertical, lateral, and torsional buffeting displacement responses of the bridge deck structure increase nonlinearly with the increase of wind speed.

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Zhao, Guo Hui, Yu Li, and Hua Bai. "Wind Tunnel Test and the Analysis of Buffeting Performance of Free-Standing Tower of Cable-Stayed Bridge under Yaw Wind." Advanced Materials Research 532-533 (June 2012): 215–19. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.215.

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The buffeting performance of free-standing tower of JiangHai Navigation Channel Bridge, a cable-stayed bridge, under yaw wind is investigated by means of wind tunnel test of aeroelastic model. It is found that the variation of buffeting response of free-standing tower with wind yaw angle is not monotonous. The lateral buffeting response on the top of the free-standing tower reach their minimal values and maximal values at around 150°and 180°of wind yaw angle respectively and the longitudinal buffeting response attain their maximal values at around 90°of wind yaw angle. Also, at the 2/3 height of the tower the lateral buffeting response and torsional buffeting response get their minimal values at around 150°of wind yaw angle, and at around 180°achieve the maximal values. It is also seen that, the buffeting response changes with the wind speed at a conic curve approximately.

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Liu, Zhe, and Yong Kun Luo. "Bridge Buffeting Analysis Based on POD and Aeroelastic Coupling Method." Advanced Materials Research 163-167 (December 2010): 3878–81. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.3878.

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The bridge buffeting response is a type of response varying with the time, space and frequency, in this paper, the bridge buffeting response analysis method based on Proper Orthogonal Decomposition (POD) and aeroelastic coupling is proposed, which can consider the contribution of effective turbulence on the bridge buffeting response. To test the proposed technique, a cable-stayed bridge is used to compare current analysis with the results using the traditional buffeting simulation method.

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Geng, Meng Xi, Ben Ning Qu, Jiao Long Peng, and Xiao Chun Wang. "Buffeting Internal Force Response Analysis for Stable Type Suspension Bridge." Applied Mechanics and Materials 444-445 (October 2013): 32–36. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.32.

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According to the definition of the Buffeting, it is caused by a fluctuating wind. Since fluctuating wind is wind speed changing with time in the atmosphere, it will cause the vibration of the structure. And pulsating wind reflects the atmospheric boundary layer wind disturbance and randomness. In the paper, Stable Type Suspension Bridge (STSB) is researched for buffeting problem. A finite element model of the bridge is set up using the finite element software. The buffeting response of the bridge is calculated and studied. The influence of the opposite tensional structures in the bridge on buffeting response of the bridge is assessed.

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Zhu, Siyu, Yongle Li, Yuyun Yang, and Nengpan Ju. "Stochastic Buffeting Analysis of Uncertain Long-Span Bridge Deck with an Optimized Method." Buildings 12, no. 5 (May 9, 2022): 632. http://dx.doi.org/10.3390/buildings12050632.

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The buffeting analysis of an uncertain long-span bridge deck was carried out in this paper. Due to the effect of strong spatial correlation of wind excitation, it should be assumed as partially coherent multiple excitations. The following includes a theoretical formula for the buffeting analysis of a long-span bridge deck with uncertain parameters, which was achieved mainly by a combination of the stochastic pseudo excitation method (SPEM) and response surface method (RSM). The SPEM-RSM was firstly applied to deal with the complicated spectral density function matrix of wind excitation. The buffeting response of the bridge deck was then calculated and verified by the results from the Monte Carlo simulation (MCS). The efficiency and applicability of the hybrid method for strong spatial correlation was proved. After the comparison, the effect of uncertain structural parameters and wind speed on the buffeting performance of the bridge deck were computed. The results showed that the whole uncertainties essentially affected the buffeting response of the deck. The uncertain wind speed played the most significant role in the vertical and lateral motion of the deck. The joint influences between structural uncertainties and uncertain wind speed further affect the random characteristics of the responses. Finally, the effects of different wind speed and wind angle of attack on the aerodynamic performance of the bridge are examined. The variance of the responses increased with the development of wind speed. The effect of different attack angles on the buffeting responses was significant.

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Han, Y., Z. Q. Chen, X. G. Hua, Z. Q. Feng, and GJ Xu. "Wind loads and effects on rigid frame bridges with twin-legged high piers at erection stages." Advances in Structural Engineering 20, no. 10 (January 9, 2017): 1586–98. http://dx.doi.org/10.1177/1369433216684350.

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This article presents a procedure for analyzing wind effects on the rigid frame bridges with twin-legged high piers during erection stages, taking into account all wind loading components both on the beam and on the piers. These wind loading components include the mean wind load and the load induced by the three turbulence wind components and by the wake excitation. The buffeting forces induced by turbulence wind are formulated considering the modification due to aerodynamic admittance functions. The buffeting responses are analyzed based on the coherence of buffeting forces and using finite element method in conjunction with random vibration theory in the frequency domain. The peak dynamic response is obtained by combining the various response components through gust response factor approach. The procedure is applied to Xiaoguan Bridge under different erection stages using the analytic aerodynamic parameters fitted from computational fluid dynamics. The numerical results indicate that the obtained peak structural responses are more conservative and accurate when considering the effect of each loading component on the beam and on the piers, and the roles of different loading components are different with regard to bridge configurations. Aerodynamic admittance functions are source of the important part of the error margin of the analytical prediction method for buffeting responses of bridges, and buffeting responses based on wind velocity coherence will underestimate the results.

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Kim, Jung, Kong, Lee, and An. "In-Situ Data-Driven Buffeting Response Analysis of a Cable-Stayed Bridge." Sensors 19, no. 14 (July 10, 2019): 3048. http://dx.doi.org/10.3390/s19143048.

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To analytically evaluate buffeting responses, the analysis of wind characteristics such as turbulence intensity, turbulence length, gust, and roughness coefficient must be a priority. The analytical buffeting response is affected by the static aerodynamic force coefficient, flutter coefficient, structural damping ratio, aerodynamic damping ratio, and natural frequencies of the bridge. The cable-stayed bridge of interest in this study has been used for 32 years. In that time, the terrain conditions around the bridge have markedly changed from the conditions when the bridge was built. Further, the wind environments have varied considerably due to climate change. For these reasons, the turbulence intensity, length, spectrum coefficient, and roughness coefficient of the bridge site must be evaluated from full-scale measurements using a structural health monitoring system. Although the bridge is located on a coastal area, the evaluation results indicated that the wind characteristics of bridge site were analogous to those of open terrain. The buffeting response of the bridge was analyzed using the damping ratios, static aerodynamic force coefficients, and natural frequencies obtained from measured data. The analysis was performed for four cases. Two case analyses were performed by applying the variables obtained from measured data, while two other case analyses were performed based on the Korean Society of Civil Engineers (KSCE) Design Guidelines for Steel Cable Supported Bridges. The calculated responses of each analysis case were compared with the buffeting response measured at wind speeds of less than 25 m/s. The responses obtained by numerical analysis using estimated variables based on full-scale measurements agreed well with the measured buffeting responses measured at wind speeds of less than 25 m/s. Moreover, an extreme wind speed of 44 m/s, corresponding to a recurrence interval of 200 years, was derived from the Gumbel distribution. Therefore, the buffeting responses at wind speeds of 45 m/s were also determined by applying the estimated variables. From these results, management criteria based on measurement data for in-service bridge are determined and each level of management is proposed.

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Li, Yan, Jun Ma, Hong Fei Sheng, Li Hui Yin, Li Wang, and Zheng Jun Wang. "Buffeting Reliability Analysis of Long Span Concrete-Filled Steel Tube Arch Bridge during Construction Stage." Key Engineering Materials 540 (January 2013): 55–62. http://dx.doi.org/10.4028/www.scientific.net/kem.540.55.

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In construction stage, a large buffeting response would endanger construction safety and quality for a long span concrete-filled steel tube (CFST) arch bridge. Developing the study on buffeting security is indispensable to CFST arch bridge in construction stage. Combining random vibration analysis of structure with modern probability theory, taking an actual large span CFST arch bridge as example, dynamic reliability of buffeting responses research and analysis is developed, which is based on the buffeting analysis on time domain at the longest cantilever construction stage. The paper gives quantitative valuation on wind-vibration safety performance of the bridge in construction phase and offers a new thought and reference for homologous project.

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Huang, Li Hua, Bing Li, Gang Lei, and Dong Dong Shi. "Dynamic and Buffeting Analysis of Suspension Pipeline Bridge." Applied Mechanics and Materials 137 (October 2011): 113–18. http://dx.doi.org/10.4028/www.scientific.net/amm.137.113.

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Suspension aerial crossing structures are broadly applied for supporting petroleum pipelines across special terrain for their optimal structural style and constructional benefit. Due to the general flexibility of the structures, pipeline suspension bridges easily vibrate under the action of random wind forces. One of the typical vibration responses, known as buffeting, is considered to be an important factor for the serviceable safety of suspension bridges. In this paper, the dynamical model of a suspension pipeline bridge is presented and buffeting analysis under the action of wind loads is carried out through the Finite Element Method. It is shown that the frequency spectrum of the suspension pipeline bridge is composed of densely distributed modal frequencies. Low frequencies are mainly focused on horizontal and vertical bending motions of the bridge. Based on the standard harmonic response analysis, the Pseudo-Excitation Method (PEM) is introduced to obtain the buffeting vibration in response to the wind excitation. The correlative formulas of quasi-static buffeting force model are derived, and the buffeting analysis of the bridge using PEM is achieved on the solution platform Ansys.

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Bai, Hua, and Yue Zhang. "Research on Simplifying the Buffeting Response Spectrum of Suspension Bridge." Advanced Materials Research 791-793 (September 2013): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.370.

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In order to solve the problem of traditional buffeting analysis method is complex, the paper summarizes a calculation method of simplifying the suspension bridge buffeting response spectrum which considers the background response by simplifying the vibration mode function. Examples calculation shows that this function is efficient and accurate. With this method the paper analyzes the impact of parameters including structural damping ratio, aerodynamic admittance function, pneumatic self-excited forces, the main beam span and so on on the suspension bridge buffeting response. Results show that: First, the impact of the background response on concrete bridges with larger damping ratio cannot be ignored. Second, when aerodynamic admittance takes Sears function, the buffeting response analysis results may be partial dangerous. Third, the role of the background response on large long-span bridges of more than 2000 m can be ignored.

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11

Laima, Shujin, Hui Feng, Hui Li, Yao Jin, Feiyang Han, and Wencheng Xu. "A Buffeting-Net for buffeting response prediction of full-scale bridges." Engineering Structures 275 (January 2023): 115289. http://dx.doi.org/10.1016/j.engstruct.2022.115289.

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12

Hao, Tian Zhi, Xiao Li Xie, and Tian Jia Hao. "Dynamic Buffeting Response Analysis of High Pier and Long Span Continuous Rigid Frame Bridge with Stochastic Wind Field." Advanced Materials Research 538-541 (June 2012): 2531–35. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.2531.

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The fluctuating wind field is simulated for digital by using the stationary Gauss processes, which Kaimal spectrum and Panofsky spectrum is used to the simulation of wind target spectrum with different direction and speed. According to Davenport quasi-steady buffeting force model formula, the time-history of wind velocity is converted to Buffeting force time history, which are applied to the Structure model node, combined with ANSYS for long-span continuous rigid frame bridge buffeting response analysis dynamic simulation.Taking a high pier and long span continuous rigid frame bridge as an example, analyzes dynamic buffeting response of the bridge under the action of the stochastic wind field, which as the guidance of high pier and long span continuous rigid frame bridge design work, practice has proved that the method is simple, reliable, also can be a way that dynamic analysis of buffeting response of large span bridge or tower structure under the action of stochastic wind field.

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Li, Zhi-Guo, Fan Chen, Cheng Pei, Jia-Ming Zhang, and Xin Chen. "Comfort Evaluation of Double-Sided Catwalk for Suspension Bridge due to Wind-Induced Vibration." Mathematical Problems in Engineering 2021 (March 11, 2021): 1–12. http://dx.doi.org/10.1155/2021/6673816.

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Buffeting response of a double-sided catwalk designed for Maputo Bridge was investigated considering wind load nonlinearity, geometric nonlinearity, and self-excited forces. Buffeting analysis was conducted in time domain using an APDL-developed program in ANSYS, and the results were compared with the buffeting response under the traditional linear method. The wind field was simulated using the spectra representation method. Aerostatic coefficients were obtained from section model wind tunnel test. Parameter study has been carried out to investigate the effects of cross bridge interval and the gantry rope diameter on buffeting response. Referring to the ISO 2631-1(1997) standard and the annoyance rate model, the comfort of catwalk due to wind-induced vibration was evaluated. The results indicate that traditional linear calculation methods will underestimate the buffeting response of the catwalk, and enlarging the gantry rope size as well as decreasing the cross bridge interval would increase the comfort level. Moreover, the effect of gantry rope diameter was obvious than that of cross bridge interval. Annoyance rate model can evaluate the comfort level quantitatively compared to the ISO standard.

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Bean, D. E., N. J. Wood, and D. G. Mabey. "The Suppression of Single-Fin Buffeting Using Tangential Leading Edge Blowing on a Delta Wing." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 206, no. 2 (July 1992): 93–104. http://dx.doi.org/10.1243/pime_proc_1992_206_246_02.

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The application of tangential leading edge blowing to reduce levels of single-fin buffeting has been studied. The tests were performed at the University of Bath in the 2.1 m × 1.5 m wind tunnel using two cropped 60° delta wings. To measure the buffet excitation, a rigid fin instrumented with miniature differential pressure transducers was used. A flexible fin of similar planform and size was used to measure the buffeting response. Steady state static pressure data and laser light sheet flow visualization were employed to aid interpretation of the vortical flow over the wings, and hence identify the causes of the buffeting. The profiles of the buffet excitation and response were found to match each other very closely. It was observed that the leading edge blowing modified the leading edge vortices by reducing the ‘effective angle of attack’ of the vortex. Blowing at a constant rate shifted the buffet excitation and response to higher angles of attack. Flow visualization confirmed that the mechanism at peak buffeting had not changed, but had been merely shifted. It has been shown that the use of an optimum blowing programme could completely suppress the buffeting response.

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Su, Yi, Jin Di, Shaopeng Li, Bin Jian, and Jun Liu. "Buffeting Response Prediction of Long-Span Bridges Based on Different Wind Tunnel Test Techniques." Applied Sciences 12, no. 6 (March 20, 2022): 3171. http://dx.doi.org/10.3390/app12063171.

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The traditional method for calculating the buffeting response of long-span bridges follows the strip assumption, and is carried out by identifying aerodynamic parameters through sectional model force or pressure measurement wind tunnel tests. However, there has been no report on predicting the buffeting response based on the sectional model vibration test. In recent years, the author has proposed a method, based on the integrated transfer function, for predicting the buffeting response of long-span bridges through theoretical and full-bridge tests. This provided an idea for predicting the buffeting response based on the sectional model vibration test. Unfortunately, the effectiveness and accuracy of this method have not been proven or demonstrated through effective tests. To solve this problem, a long-span suspension bridge was taken as a background. Parameters such as aerodynamic admittance were identified through a sectional model force measurement test and the integrated transfer functions were identified through a sectional model vibration test. A taut strip model test was also conducted. Furthermore, the buffeting response prediction results based on three kinds of wind tunnel test techniques were compared. The results showed that if the strip assumption was established, the results of the three methods aligned well, and that selecting a reasonable model aspect ratio for the test could effectively reduce the influence of the 3D effect; moreover, identifying the integrated transfer function by the sectional model vibration test could effectively predict the long-span bridge buffeting response. Furthermore, when the strip assumption failed, the results of the traditional calculation method using 3D aerodynamic admittance became smaller. A larger result would be obtained by neglecting the influence of aerodynamic admittance.

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Solari, Giovanni. "Gust Buffeting. II: Dynamic Alongwind Response." Journal of Structural Engineering 119, no. 2 (February 1993): 383–98. http://dx.doi.org/10.1061/(asce)0733-9445(1993)119:2(383).

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Thorbek, L. T., and S. O. Hansen. "Coupled buffeting response of suspension bridges." Journal of Wind Engineering and Industrial Aerodynamics 74-76 (April 1998): 839–47. http://dx.doi.org/10.1016/s0167-6105(98)00076-2.

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Hui, Michael C. H., Q. S. Ding, and Y. L. Xu. "Buffeting Response Analysis of Stonecutters Bridge." HKIE Transactions 12, no. 2 (January 2005): 8–21. http://dx.doi.org/10.1080/1023697x.2005.10667998.

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Helgedagsrud, Tore A., Yuri Bazilevs, Kjell M. Mathisen, Jinhui Yan, and Ole A. Øseth. "Modeling and simulation of bridge-section buffeting response in turbulent flow." Mathematical Models and Methods in Applied Sciences 29, no. 05 (May 2019): 939–66. http://dx.doi.org/10.1142/s0218202519410045.

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Buffeting analysis plays an important role in the wind-resistant design of long-span bridges. While computational methods have been widely used in the study of self-excited forces on bridge sections, there is very little work on applying advanced simulation to buffeting analysis. In an effort to address this shortcoming, we developed a framework for the buffeting simulation of bridge sections subjected to turbulent flows. We carry out simulations of a rectangular bridge section with aspect ratio 10 and compute its aerodynamic admittance functions. The simulations show good agreement with airfoil theory and experimental observations. It was found that inflow turbulence plays an important role in obtaining accurate wind loads on the bridge sections. The proposed methodology is envisioned to have practical impact in wind engineering of structures in the future.

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Chesneau, T. R., and N. J. Wood. "Fin Buffeting Characteristics of a Generic Single Fin Aircraft." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 3 (July 1996): 247–60. http://dx.doi.org/10.1243/pime_proc_1996_210_368_02.

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Experiments have been performed to investigate the fin buffeting characteristics of a generic single fin aircraft. A variety of configurations, including high wing, mid wing and low wing have been examined, some with the addition of leading edge extensions, foreplanes and cheek intakes. The fin buffeting was measured using a flexible fin, which was related to the buffet pressure flowfield using data from an alternative, pressure tapped, rigid fin. Results have been obtained over a wide range of angles of attack at low subsonic speeds. The production of upstream vortices affects the progression of the primary wing vortex with angle of attack to alter the fin buffeting response. The results indicate that the high wing configurations are sensitive to the presence of additional vortex pairs emanating from forebody features. For low wing configurations, peak buffeting magnitudes may be significantly affected by foreplane incidence in a canard configuration. The interaction between foreplane, wing and body vortices is complex and may result in either reduced or increased levels of buffeting response.

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Liu, Zhe. "Buffeting Prediction of a Square Cylinder with Inflow Turbulence." Applied Mechanics and Materials 249-250 (December 2012): 100–103. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.100.

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It is known that the fluctuating structural load is caused by turbulent eddies flowing past or impinging upon the structure in case of turbulence buffeting. The prediction of the response of a structure to turbulence buffeting may be very important. In this paper the buffeting response of square cylinder with constant damping ratio (5%) based on FSI theory proposed by Zhe Liu [6] is simulated. And the movement of bluff body is controlled in the across-flow direction, and two types of inlet boundary conditions are considered to compare the different influence of them on the flow around the square cylinder, one is the steady inlet boundary and the other is the unsteady one.

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Phan, Duc-Huynh. "Passive Winglet Control of Flutter and Buffeting Responses of Suspension Bridges." International Journal of Structural Stability and Dynamics 18, no. 05 (May 2018): 1850072. http://dx.doi.org/10.1142/s0219455418500724.

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The passive control using winglets has been considered to be an alternative solution for control of flutter and buffeting responses of long suspension bridges. This method is aimed at not only developing lightweight, reduced-cost stiffening girders without adding stiffness for aerodynamic stability, but also avoiding problems from malfunctions caused by the control and energy supply systems of active control devices by winglets. This paper presented a mechanically controlled approach using the winglets, for which a two-dimensional bridge deck model was numerically and experimentally studied. In addition, numerical research on the flutter and buffeting passive control of a 3000[Formula: see text]m span suspension bridge was carried out. The result showed that the flutter speed of the suspension bridge increases, whereas the buffeting response decreases, through the implementation of the winglets.

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Yan, Lei, Lei Ren, Xuhui He, Siying Lu, Hui Guo, and Teng Wu. "Strong Wind Characteristics and Buffeting Response of a Cable-Stayed Bridge under Construction." Sensors 20, no. 4 (February 24, 2020): 1228. http://dx.doi.org/10.3390/s20041228.

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This study carries out a detailed full-scale investigation on the strong wind characteristics at a cable-stayed bridge site and associated buffeting response of the bridge structure during construction, using a field monitoring system. It is found that the wind turbulence parameters during the typhoon and monsoon conditions share a considerable amount of similarity, and they can be described as the input turbulence parameters for the current wind-induced vibration theory. While the longitudinal turbulence integral scales are consistent with those in regional structural codes, the turbulence intensities and gust factors are less than the recommended values. The wind spectra obtained via the field measurements can be well approximated by the von Karman spectra. For the buffeting response of the bridge under strong winds, its vertical acceleration responses at the extreme single-cantilever state are significantly larger than those in the horizontal direction and the increasing tendencies with mean wind velocities are also different from each other. The identified frequencies of the bridge are utilized to validate its finite element model (FEM), and these field-measurement acceleration results are compared with those from the FEM-based numerical buffeting analysis with measured turbulence parameters.

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Hu, Liang, You-Lin Xu, Qing Zhu, Anna Guo, and Ahsan Kareem. "Tropical Storm–Induced Buffeting Response of Long-Span Bridges: Enhanced Nonstationary Buffeting Force Model." Journal of Structural Engineering 143, no. 6 (June 2017): 04017027. http://dx.doi.org/10.1061/(asce)st.1943-541x.0001745.

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Lee, B. H. K. "Statistical analysis of wing/fin buffeting response." Progress in Aerospace Sciences 38, no. 4-5 (May 2002): 305–45. http://dx.doi.org/10.1016/s0376-0421(02)00007-6.

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Shafik, Ahmed, Ismail Shafik, Olfat El Sibai, and Ali A. Shafik. "Oviductal motile response to penile cervical buffeting." Archives of Gynecology and Obstetrics 273, no. 4 (September 16, 2005): 216–20. http://dx.doi.org/10.1007/s00404-005-0065-3.

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YANG, YEONG-BIN, SU-VAI MAC, and CHERN-HWA CHEN. "MULTI-MODE COUPLED BUFFETING ANALYSIS OF CABLE-STAYED BRIDGES." International Journal of Structural Stability and Dynamics 01, no. 03 (September 2001): 429–53. http://dx.doi.org/10.1142/s0219455401000287.

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A procedure for the spectral analysis of buffeting response of long span bridges under unsteady wind loads is developed, with emphasis placed on inclusion of the multi-mode vibrations. The effect of mean wind velocity is considered through the aerodynamic stiffness and damping matrices using the flutter derivatives, while the effect of buffeting through the auto- and cross-power spectral densities. Compared with the conventional approach, the present approach is featured by the fact that no selection has to be made concerning the dominant modes. It can be reasonably used in analyzing cable-stayed bridges of complex geometry or of asymmetric shape, such as the Kao-Ping-Hsi Bridge, where the conventional approach has its limitations. The numerical studies indicate that using the conventional approach, by which the coupling effect is ignored, may significantly overestimate the critical wind velocity, while underestimating the buffeting responses of cable-stayed bridges.

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Chen, Chern Hwa, Yuh Yi Lin, Cheng Hsin Chang, Shun Chin Yang, Yung Chang Cheng, and Ming Chih Huang. "Aerodynamic Analysis in Time Domain of a Cable-Stayed Bridge." Advanced Materials Research 479-481 (February 2012): 1205–8. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.1205.

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To determine its actual dynamic responses under the wind loads, modal identification from the field tests was carried out for the Kao Ping Hsi cable-stayed bridge in southern Taiwan. The rational finite element model has been established for the bridge. With the refined finite element model, a nonlinear analysis in time domain is employed to determine the buffeting response of the bridge. Through validation of the results against those obtained by the frequency domain approach, it is confirmed that the time domain approach adopted herein is applicable for the buffeting analysis of cable-stayed bridges.

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Tang, Rongjiang, Hongbin He, Zengjun Lu, Shenfang Li, Enyong Xu, Fei Xiao, and Avelino Núñez-Delgado. "Control of Sunroof Buffeting Noise by Optimizing the Flow Field Characteristics of a Commercial Vehicle." Processes 9, no. 6 (June 16, 2021): 1052. http://dx.doi.org/10.3390/pr9061052.

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When a commercial vehicle is driving with the sunroof open, it is easy for the problem of sunroof buffeting noise to occur. This paper establishes the basis for the design of a commercial vehicle model that solves the problem of sunroof buffeting noise, which is based on computational fluid dynamics (CFD) numerical simulation technology. The large eddy simulation (LES) method was used to analyze the characteristics of the buffeting noise with different speed conditions while the sunroof was open. The simulation results showed that the small vortex generated in the cab forehead merges into a large vortex during the backward movement, and the turbulent vortex causes a resonance response in the cab cavity as the turbulent vortex moves above the sunroof and falls into the cab. Improving the flow field characteristics above the cab can reduce the sunroof buffeting noise. Focusing on the buffeting noise of commercial vehicles, it is proposed that the existing accessories, including sun visors and roof domes, are optimized to deal with the problem of sunroof buffeting noise. The sound pressure level of the sunroof buffeting noise was reduced by 6.7 dB after optimization. At the same time, the local pressure drag of the commercial vehicle was reduced, and the wind resistance coefficient was reduced by 1.55% compared to the original commercial vehicle. These results can be considered as relevant, with high potential applicability, within this field of research.

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Zhang, Zhi-Qiang, You-Liang Ding, and Fang-Fang Geng. "Investigation of Influence Factors of Wind-Induced Buffeting Response of a Six-Tower Cable-Stayed Bridge." Shock and Vibration 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/6274985.

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This paper presents an investigation of the wind-induced buffeting responses of the Jiashao Bridge, the longest multispan cable-stayed bridge in the world. A three-dimensional finite element model for the Jiashao Bridge is established using the commercial software package ANSYS and a 3D fluctuating wind field is simulated for both bridge deck and towers. A time-domain procedure for analyzing buffeting responses of the bridge is implemented in ANSYS with the aeroelastic effect included. The characteristics of buffeting responses of the six-tower cable-stayed bridge are studied in some detail, focusing on the effects including the difference in the longitudinal stiffness between the side towers and central towers, partially longitudinal constraints between the bridge deck and part of bridge towers, self-excited aerodynamic forces, and the rigid hinge installed in the middle of the bridge deck. The analytical results can provide valuable references for wind-resistant design of multispan cable-stayed bridges in the future.

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Liu, Lian Jie, Liang Liang Zhang, Bo Wu, and Yang Yang. "Aerodynamic Admittance Research on Wide-body Flat Steel Box Girder." Open Civil Engineering Journal 10, no. 1 (December 30, 2016): 891–904. http://dx.doi.org/10.2174/1874149501610010891.

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Aerodynamic admittance is a key parameter affecting the analysis accuracy of the bridge buffeting response. However, few articles have covered the issue of the wide-body flat box girder with much smaller depth-width ratio (such as 1/12 studied in this paper). Therefore, to explore the real buffeting force of the wide-body flat box girder, experiments of the static force coefficients and aerodynamic admittance are carried out in wind tunnel. Wooden segmental model has a scale ratio of 1/60 to an actual 42 m wide suspension bridge girder. Using the high-frequency-force-balance (HFFB) equipment fixed with the segmental model under the conditions of different wind speeds and different wind attack angles, wind power spectrums of the buffeting force are measured and the variation of aerodynamic admittance parameters is analyzed. The results show that the aerodynamic admittance of the box girder measured in the experiment with this so much smaller depth-width ratio differs from the corresponding classical Sears expression. Some inspiration can be presented for the future study of the buffeting response for this kind of much wider bridge with the similar ratio in this paper.

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Zhang, Jia Wen. "The Wind-Induced Response of High-Pier Long-Span Continuous Rigid Frame Bridge." Advanced Materials Research 639-640 (January 2013): 502–9. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.502.

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The fluctuating wind field is simulated for digital by using the AR method. A three-dimension finite element model of high-pier long-span rigid frame bridge is presented in this paper. Based on this model, the gust-induced static response of the bridge under the longest cantilevered construction stage is computed. By comparing with those of two similar span rigid frame bridges with low piers, the gust-induced response characteristics of the internal force under the bottom of the piers of the high-pier long-span bridges are investigated, which is helpful for the safe design of bridges. The buffeting responses of the bridge under the longest cantilevered construction stage are also calculated in the time domain, taking account of the longitudinal and vertical turbulence action. Through the spectral analysis of the response, the comfort index of Diekemann is obtained. The effects of buffeting response on the workers’ safety under the most unfavorable construction stage are discussed.

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Chen, Xi, Fu You Xu, Wen Liang Qiu, and Zhe Zhang. "AMD Application for Suppressing the Lateral and Torsion Buffeting Response of Suspension Pipeline Bridge." Advanced Materials Research 163-167 (December 2010): 4114–19. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4114.

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Active Mass Damper has been proven to be efficient in suppressing structure vibration. Previous studies of AMD have been concentrated on the vibration control of buildings under earthquake excitation, whereas few investigation of wind-induced bridge vibration control has been conducted. In consideration of the characteristics of one suspension pipeline bridge which behaves dramatic lateral and torsional response under fluctuating wind action, a two-DOFs TMD/AMD system for suppressing both lateral and torsional responses was proposed. The bridge is modeled using Ansys and the buffeting responses of the bridge under TMD, AMD control are respectively simulated and analyzed by MATLAB/Simulink. The efficiency of different control system has been studied. The results show that two-DOFs AMD system has a better performance in suppressing the buffeting response of lateral bending and torsion. In addition, AMD system can be applicable to a wider range of frequency and therefore manifests the more stable performance than TMD under fluctuating wind loads which contain various frequency components.

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34

Tao, Tianyou, Hao Wang, Xuhui He, and Aiqun Li. "Evolutionary power spectral density analysis on the wind-induced buffeting responses of Sutong Bridge during Typhoon Haikui." Advances in Structural Engineering 20, no. 2 (July 28, 2016): 214–24. http://dx.doi.org/10.1177/1369433216660024.

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Recent field measurements on long-span bridges during typhoon events have captured strong nonstationary features in the buffeting responses. In this study, the buffeting responses of Sutong Bridge during Typhoon Haikui in 2012 recorded by structural health monitoring system are analyzed to represent the nonstationary characteristics. As an accurately measured state variable, the acceleration response of the main girder is first selected to evaluate its own original stationarity in different time intervals using the run test method. The acceleration response of the main girder can be regarded as a zero-mean nonstationary random process which is in demand to extract its transient features in time–frequency domain. Hence, the evolutionary power spectral density (EPSD) of the acceleration responses, which can present the local turbulence energy distribution in both frequency and time domains, is estimated using the wavelet-based method. Also, an average wavelet spectrum is obtained by averaging the square values of wavelet coefficients along the time axis, and the comparison between the average wavelet spectrum and Fourier spectrum shows a great conformance which indirectly verifies the validity of the obtained evolutionary power spectral density. The results of this study exhibit that there are strong nonstationary characteristics existing in the buffeting responses of Sutong Bridge during Typhoon Haikui, and it is essential to incorporate the nonstationary features of winds in the analysis or design of long-span bridges from an aerodynamic viewpoint.

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35

Aas-Jakobsen, K., and E. Strømmen. "Time domain buffeting response calculations of slender structures." Journal of Wind Engineering and Industrial Aerodynamics 89, no. 5 (April 2001): 341–64. http://dx.doi.org/10.1016/s0167-6105(00)00070-2.

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36

Shen, Zheng-feng, Jia-wu Li, Guang-zhong Gao, and Xiao-feng Xue. "Buffeting response of a composite cable-stayed bridge in a trumpet-shaped mountain pass." Advances in Structural Engineering 23, no. 3 (September 15, 2019): 510–22. http://dx.doi.org/10.1177/1369433219873984.

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Previous research showed that wind characteristics were influenced by terrain. To accurately calculate the wind-induced bridge response, this article presented a comprehensive investigation of the wind characteristics of a trumpet-shaped mountain pass by long-term monitoring. Basic strong wind characteristics such as the wind rose, turbulence intensities, turbulence length scales, turbulence spectra and normalized cross-spectrum were discussed using 10 min intervals. Due to the different types of terrain on the two sides of the bridge site, this article attempted to reflect the influence of the terrain on the wind characteristics in different wind directions. The scatter plots of wind characteristics were presented directly on the terrain map. The effects of the turbulence characteristics, mean wind speed and aerodynamic admittance function on buffeting response of the composite cable-stayed bridge were discussed by the multimode coupled frequency domain. The results show that the wind profile is extremely twisted. The larger turbulent integral scale and the lower turbulence intensity appear in the direction along the river. The effect of the mean wind speed on the buffeting response is greater than that of the fluctuating wind characteristics. The aerodynamic admittance function proposed by Holmes has the largest reduction in buffeting response.

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37

Dumon, Jéromine, Yannick Bury, Nicolas Gourdain, and Laurent Michel. "Numerical and experimental investigations of buffet on a diamond airfoil designed for space launcher applications." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 9 (June 19, 2019): 4203–18. http://dx.doi.org/10.1108/hff-07-2018-0353.

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Purpose The development of reusable space launchers requires a comprehensive knowledge of transonic flow effects on the launcher structure, such as buffet. Indeed, the mechanical integrity of the launcher can be compromised by shock wave/boundary layer interactions, that induce lateral forces responsible for plunging and pitching moments. Design/methodology/approach This paper aims to report numerical and experimental investigations on the aerodynamic and aeroelastic behavior of a diamond airfoil, designed for microsatellite-dedicated launchers, with a particular interest for the fluid/structure interaction during buffeting. Experimental investigations based on Schlieren visualizations are conducted in a transonic wind tunnel and are then compared with numerical predictions based on unsteady Reynolds averaged Navier–Stokes and large eddy simulation (LES) approaches. The effect of buffeting on the structure is finally studied by solving the equation of the dynamics. Findings Buffeting is both experimentally and numerically revealed. Experiments highlight 3D oscillations of the shock wave in the manner of a wind-flapping flag. LES computations identify a lambda-shaped shock wave foot width oscillations, which noticeably impact aerodynamic loads. At last, the experiments highlight the chaotic behavior of the shock wave as it shifts from an oscillatory periodic to an erratic 3D flapping state. Fluid structure computations show that the aerodynamic response of the airfoil tends to damp the structural vibrations and to mitigate the effect of buffeting. Originality/value While buffeting has been extensively studied for classical supercritical profiles, this study focuses on diamond airfoils. Moreover, a fluid structure computation has been conducted to point out the effect of buffeting.

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38

Chen, Xinzhong, and Ahsan Kareem. "Equivalent Static Wind Loads for Buffeting Response of Bridges." Journal of Structural Engineering 127, no. 12 (December 2001): 1467–75. http://dx.doi.org/10.1061/(asce)0733-9445(2001)127:12(1467).

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Chen, Xinzhong, Masaru Matsumoto, and Ahsan Kareem. "Time Domain Flutter and Buffeting Response Analysis of Bridges." Journal of Engineering Mechanics 126, no. 1 (January 2000): 7–16. http://dx.doi.org/10.1061/(asce)0733-9399(2000)126:1(7).

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Kim, Ho-Kyung, Masanobu Shinozuka, and Sung-Pil Chang. "Geometrically Nonlinear Buffeting Response of a Cable-Stayed Bridge." Journal of Engineering Mechanics 130, no. 7 (July 2004): 848–57. http://dx.doi.org/10.1061/(asce)0733-9399(2004)130:7(848).

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41

Gu, M., S. R. Chen, and C. C. Chang. "Background component of buffeting response of cable-stayed bridges." Journal of Wind Engineering and Industrial Aerodynamics 90, no. 12-15 (December 2002): 2045–55. http://dx.doi.org/10.1016/s0167-6105(02)00320-3.

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42

Cheynet, Etienne, Jasna Bogunović Jakobsen, and Jónas Snæbjörnsson. "Buffeting response of a suspension bridge in complex terrain." Engineering Structures 128 (December 2016): 474–87. http://dx.doi.org/10.1016/j.engstruct.2016.09.060.

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43

Xu, Y. L., L. D. Zhu, and H. F. Xiang. "Buffeting response of long suspension bridges to skew winds." Wind and Structures 6, no. 3 (June 25, 2003): 179–96. http://dx.doi.org/10.12989/was.2003.6.3.179.

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44

Guo, Zengwei, Yaojun Ge, Lin Zhao, and Yahui Shao. "Linear regression analysis of buffeting response under skew wind." Wind and Structures An International Journal 16, no. 3 (March 25, 2013): 279–300. http://dx.doi.org/10.12989/was.2013.16.3.279.

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45

Lever, J. H., and G. Rzentkowski. "Determination of the Fluid-Elastic Stability Threshold in the Presence of Turbulence: A Theoretical Study." Journal of Pressure Vessel Technology 111, no. 4 (November 1, 1989): 407–19. http://dx.doi.org/10.1115/1.3265698.

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A model has been developed to examine the effect of the superposition of turbulent buffeting and fluid-elastic excitation on the response of a single flexible tube in an array exposed to cross-flow. The modeled response curves for a 1.375-pitch ratio parallel triangular array are compared with corresponding experimental data for the same array; reasonably good qualitative agreement is seen. Turbulence is shown to have a significant effect on the determination of the stability threshold for the array, with increasing turbulent buffeting causing a reduction in the apparent critical velocity. The dependence of turbulence response on mass ratio is also found to yield a slight independence between mass and damping parameters on stability threshold estimates, which may account for similar experimental findings. Different stability criteria are compared, and an attempt is made to provide some guidance in the interpretation of response curves from actual tests.

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46

Wang, Xiong Jiang, Jia Yun Xu, and Ji Chen. "Study on the Indiscrete Tuned Mass Damper for Buffeting Control of Long Span Cable-Stayed Bridges." Applied Mechanics and Materials 160 (March 2012): 405–9. http://dx.doi.org/10.4028/www.scientific.net/amm.160.405.

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A study of buffeting control of the E-dong Bridge Using an indiscrete tuned mass damper (ITMD) system is performed in this paper. Different from the traditional multiple tuned mass damper (MTMD) system which is fixed along the main span of bridge discretely, this indiscrete tuned mass damper is attached to the centre region of the bridge’s main span continuously. A three-dimensional finite element model of E-dong Bridge, is completed by the software of ANSYS. By comparing the vertical and lateral buffeting response of bridge without dampers, the control efficiency of ITMD and MTMD is confirmed.

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Au-Yang, M. K. "Turbulent Buffeting of a Multispan Tube Bundle." Journal of Vibration and Acoustics 108, no. 2 (April 1, 1986): 150–54. http://dx.doi.org/10.1115/1.3269315.

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An expression to calculate the buffeting response of a multispan tube bundle with nonconstant linear mass density is derived by generalizing Powell’s joint acceptance concept. Application of the equation to lock-in vortex-induced vibration analysis is also discussed.

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Luo, Nan, Ai Xia Liang, Hai Li Liao, and Mei Yu. "Wind Tunnel Investigations for the Free Standing Tower of the Penang Second Bridge." Applied Mechanics and Materials 256-259 (December 2012): 1577–81. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1577.

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The Penang Second Bridge is a new bridge under construction in Penang, Malaysia. The aerodynamic behavior of the bridge was one of the main concerns. This paper summarizes of the wind tunnel testing of the 1:40 scaled aeroelastic model testing for the free standing tower. The wind tunnel Investigations were carried out with the objective of verifying the detailed design of bridge towers through measurement of the buffeting response to turbulent wind, susceptibility to galloping instabilities and susceptibility to vortex shedding excitation in smooth oncoming flow.The test results show that explicit vortex-induced vibration was observed for the completed free standing tower, however it will not affect the safety of the tower, and the buffeting response of tower is within acceptable range under the designed wind speed.

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Ibrahim, Khaled, and Guido Morgenthal. "Pseudo three-dimensional simulation of buffeting response under turbulent wind." IABSE Symposium Report 102, no. 41 (September 1, 2014): 309–16. http://dx.doi.org/10.2749/222137814814027783.

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AKIYAMA, Hiroshi, and Masanao NAKAYAMA. "Time-history response analysis on buffeting vibrations of tall buildings." Wind Engineers, JAWE 1989, no. 38 (1989): 3–14. http://dx.doi.org/10.5359/jawe.1989.3.

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Journal articles on the topic 'Buffeting response'

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