主动控制翼板抑制悬索桥颤振的研究

主动控制翼板是一种新型桥梁气动措施。本文基于非定常气动力理论，推演了安装主动控制翼板后作用在整个桥梁主梁单位长度上气动力表达式，从增加系统扭转阻尼的角度，研究了翼板主动扭转振动参数的选取。在此基础上，对某大跨悬索桥方案进行了二自由度颤振分析，结果表明：合理选取翼板的主动扭转振动参数，主动控制翼板能够有效地提高该桥的颤振稳定性。

The Study of Suppressing the Flutter of Suspension Bridges by Active Aerodynamic Wings

Using active aerodynamic wing is a new aerodynamic measure for bridge stability. Based on the unsteady aerodynamic theory, the expressions of the aerodynamic forces acted on per length of the whole bridge deck are derived. The bridge deck consists of the original bridge deck and the active aerodynamic wings attached bellow the leading and the trailing edges of the deck. Then, from the standpoint of increasing the torsional damping of the system, the selection of the parameters of the active torsional vibration of the active aerodynamic wings is discussed. Finally, the flutter analysis of a long span suspension bridge project is carried out with the 2 DOF mathematical model. The results show that with reasonable selection of the parameters of the active torsional vibration, the active aerodynamic wings can improve the flutter stability of the bridge effectively.