全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...

平板断面风致振动的流场驱动机理分析

, PP. 75-82

Keywords: 桥梁工徎,颤振,粒子图像测速,流场机理,平板断面,本征正交分解,分块分析

Full-Text   Cite this paper   Add to My Lib

Abstract:

?应用粒子图像测速技术分析了平板断面颤振过程中尾部旋涡变化过程,采用相位平均的方法研究模型周期性振动与旋涡规律性演化之间的关系。当风速低于颤振临界风速时模型尾部旋涡尺度较小,结构振动幅度较小,当风速接近颤振临界风速时尾部旋涡经历了能量从小涡向大涡的传递过程后由能量较大的旋涡控制结构振动,结构振幅明显增加,直到模型振动发散。结合计算流体动力学的数值模拟方法获得颤振时刻模型表面的压力场,采用本征正交分解技术分析模型表面压力的模态特征函数,并根据分析结果对模型表面进行合理分区,利用分块分析的思想研究颤振过程中气流能量输入特点。结果表明:在颤振过程中模型表面波动压力的主控成分向迎风端风嘴漂移;主控波动压力的漂移造成模型通过迎风端风嘴从气流中吸收大量的能量,在一个完整振动周期内,气流输入到振动系统的能量不断增加,而造成结构稳定性的丧失。

References

[1]  盛森芝,徐月亭,袁辉清.近十年来流动测量技术的新发展[J].力学与实践,2002,24(5):1-14.
[2]  ZHANG Wei,GE Yao-jun.Flow Field Mechanism of Wind Induced Vibration Response of Large Span Bridge Influenced by Guide Vanes[J].China Journal of Highway and Transport,2009,22(3):52-56.
[3]  周志勇,邓世为,杨立坤.基于POD技术对大跨度桥梁颤振机理的探讨[C]//中国土木工程学会.第十四届全国结构风工程学术会议论文集.北京:人民交通出版社,2009:221-227.
[4]  ZHOU Zhi-yong,DENG Shi-wei,YANG Li-kun.Study on the Flutter Mechanism of Large Span Bridge by POD[C]//China Civil Engineering Society.Proceedings of the 14th China Conference on Structural Wind Engineering.Beijing:China Communications Press,2009:221-227.
[5]  FUJISAWA N,TAKEDA G,IKE N.Phase-averaged Characteristics of Flow Around a Circular Cylinder Under Acoustic Excitation Control[J].Journal of Fluids and Structures,2004,19(2):159-170.
[6]  SELVAM R P,TARINI M J,LARSEN A.Computer Modelling of Flow Around Bridges Using LES and FEM[J].Journal of Wind Engineering and Industrial Aerodynamics,1998,77-78:643-651.
[7]  TAMURA T,ONO Y.LES Analysis on Aeroelastic Instability of Prisms in Turbulent Flow[J].Journal of Wind Engineering and Industrial Aerodynamics,2003,91(12/13/14/15):1827-1846.
[8]  LIU Y,TUCKER P G,LO IACONO G.Comparison of Zonal RANS and LES for a Non-isothermal Ribbed Channel Flow[J].International Journal of Heat and Fluid Flow,2006,27(3):391-401.
[9]  MATSUMOTO M,MIZUNO K,OKUBO K,et al.Torsional Flutter and Branch Characteristics for 2-D Rectangular Cylinders[J].Journal of Fluids and Structures,2005,21(5/6/7):597-608.
[10]  SHENG Sen-zhi,XU Yue-ting,YUAN Hui-qing.New Development in the Technology of Flow Measurement over the Last Decade[J].Mechanics in Engineering,2002,24(5):1-14.
[11]  张 伟,葛耀君.导流板对大跨桥梁风振响应影响的流场机理[J].中国公路学报,2009,22(3):52-56.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133