摘要
从能量的角度研究气动翼板控制悬索桥颤振的物理机理。基于弯扭二模态耦合颤振系统,分别推导了气流由主梁和一对气动翼板输入系统的能量以及结构阻尼耗散能量的表达式。以某跨海方案桥为例进行了研究,结果表明:气动翼板能有效耗散气流由主梁输入系统的能量,桥梁颤振临界风速提高达30 %。
Flutter control of the suspension bridges by pneumatic winglets is studied from the standpoint of energy mechanism. On the basis of the vertical bending and torsional bimodal coupled flutter system, the expressions of energy induced by the aeroelastic forces act on the bridge deck and a pair of winglets above the deck and by the structural damping are derived, respectively. With a project of sea-crossing bridge taken as an example, the results show that the aerodynamic energy generated from the bridge deck can be dissipated by a pair of winglets effectively, and the flutter critical speed of the bridge can be improved to 30%.
出处
《公路》
北大核心
2005年第6期46-50,共5页
Highway
