An active vibration suppression method for the flutter of long-span suspension #br#
bridges based on posture-adjustable aerodynamic winglets
Li Ke1，2 Ge Yaojun3 Zhao Lin3
1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education，Chongqing University，
Chongqing 400045，China；2. School of Civil Engineering，Chongqing University，Chongqing 400045，China；
3. State Key Laboratory for Disaster Reduction in Civil Engineering，Tongji University，Shanghai 200092，China
Abstract：In view of the problem that it is difficult for the traditional passive aerodynamic countermeasures to meet the flutter control requirements of long-span suspension bridges，an active vibration suppression method is proposed based on with posture-adjustable aerodynamic winglets. By introducing the Roger’s expression of the timedomain self-excited force，the dynamic characteristics of the girder-winglet system is first established in a state-space formula. This formula is optimized by system reconstruction technique to make it more reasonable and effective in response to the adjustment mechanism of the winglets. Then，through introducing a linear-quadratic function based on the control weights of the girder-winglet system’s vibration amplitude，a real-time adjustment method for the flutter stability is established from vibration state monitoring to winglet posture controlling. To verify the effectiveness and robustness of the method，a feedback control system for wind tunnel tests of the bridge sectional model is developed. It is found that the main component of the flutter control force is the total torque，which is formed by the winglets’ anti-phase lift force and amplified by the distance between the winglets. Best control effect is noticed when the phase of the windward winglet is 90 degrees in advance of the girder’s torsional vibration and the leeward winglet is lagging by degrees. The flutter critical speed can be increased by 33% when the weight of the girder is adjusted to two times of the weight of the wing plate.
李珂 葛耀君 赵林. 基于可调姿态气动翼板的大跨度#br#
悬索桥颤振主动抑振方法[J]. 土木工程学报, 2019, 52(12): 93-103.
Li Ke Ge Yaojun Zhao Lin. An active vibration suppression method for the flutter of long-span suspension #br#
bridges based on posture-adjustable aerodynamic winglets. 土木工程学报, 2019, 52(12): 93-103.
