Conference Paper Energy conversion mechanism of aerodynamic flutter of a box girder

Ge, Yaojun  ,  Liu, Zujun  ,  Yang, Yongxin  ,  葛, 耀君  ,  劉, 祖軍  ,  楊, 詠昕

Based on the flutter control equations with two degrees of freedom, including heaving and pitching vibration, the energy control equations of flutter oscillation were firstly derived. In order to solve the coupled energy equations of heaving degree and pitching degree, the step-by-step method was adopted to find out two decoupled solutions. Then, the calculation formulas of aerodynamic energy in these two degrees were achieved, and the criterion of flutter instability was derived due to system energy change rate. Through the wind tunnel testing with the sectional model of a box girder, the energy conversion rule of the heaving and pitching vibration was studied, and the transmission and feedback mechanism of airflow energy distributed on these two degrees was analyzed. The mechanism of coupled flutter of a box girder was finally described by energy input and output through the heaving and pitching degrees of freedom with the phase difference. It can be concluded that aerodynamic flutter is controlled by the energy conversion in the pitching degree of freedom, including three components, aerodynamic force, aerodynamic damping and aerodynamic stiffness. With the increase of oscillation time or cycles, the energy input from aerodynamic force will increase, and the energy output through aerodynamic damping will also increase, while the energy output through aerodynamic stiffness will change slightly and periodically.
Meeting Information: First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan
Physical characteristics: Original contains illustrations
形態: 図版あり

Number of accesses :  

Other information