附加攻角效应对颤振稳定性能影响

PDF(2780 KB)

振动与冲击 ›› 2015, Vol. 34 ›› Issue (2) : 45-49.

论文

附加攻角效应对颤振稳定性能影响

欧阳克俭1，陈政清2

作者信息 +

Influence of static wind additive attack angle of flutter performance

OUYANG Ke-jian1，CHEN Zheng-qing2

Author information +

文章历史 +

摘要

用强迫振动装置识别攻角从-3°~+4°细化步长变化为1°的洞庭湖二桥主梁断面气动导数；将该气动导数拟合成折减风速、攻角的三维曲面，只需获取某一有效攻角的具体数值即可自动求得所有气动导数值。通过在ANSYS中的三维TABLE表存储各攻角的气动导数，自动计入附加攻角对颤振稳定性影响。全模态颤振分析结果表明，附加攻角效应可降低该类桥梁的颤振临界风速。若按常规试验方法以3°攻角为步长进行气动导数插值计算，颤振分析有可能得到错误结论。

Abstract

Aerodynamic derivatives of Dongting Lake Bridge Girder Sections were identified by forced vibration in wind tunnel, and the angle of attack changes in steps of 1 ° from -3 ° to +4 °. the aerodynamic derivatives were fitted to three-dimensional surface by reduced velocity,angle of attack. Just to obtain a specific value of the effective angle of attack, all aerodynamic derivatives can be automatically obtained by the value of each angle of attack. aerodynamic derivatives were stored by three-dimensional TABLE in ANSYS, The effect of additional angle of attack to flutter stability were automatically included. Full-mode flutter analysis indicated that the additional angle of attack effect reducing typical bridge critical flutter speed, influence extent due to the different type of bridge.

导出引用

欧阳克俭;陈政清. 附加攻角效应对颤振稳定性能影响[J]. 振动与冲击, 2015, 34(2): 45-49

OUYANG Ke-jian;CHEN Zheng-qing. Influence of static wind additive attack angle of flutter performance[J]. Journal of Vibration and Shock, 2015, 34(2): 45-49