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

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摘要针对传统被动气动措施难以满足超大跨度悬索桥颤振设防需求的问题，提出一种基于可调姿态气动翼板的颤振主动抑振方法。该方法首先基于Roger颤振自激力时域模型建立主梁翼板动力系统的状态空间表达，并通过系统重构优化使该表达能更加合理、有效地反应翼板姿态调节机制。此后通过引入基于主梁翼板系统振幅控制权重的线性二次型指标，建立从桥梁振动状态监测到翼板姿态控制的颤振稳定性实时调节方法。为验证该方法的有效性和鲁棒性，研发针对桥梁节段模型风洞试验的反馈控制系统。研究发现，作用于两侧翼板上的反相气动升力在翼板间距的放大作用下形成的力偶是颤振控制力的主要成分，当迎风侧翼板振动相位滞后于主梁扭转振动约90°、背风侧翼板振动相位超前于主梁扭转振动约90°时有最优抑振效果；调节主梁控制权重至翼板控制权重的2倍时，可以提高颤振临界风速33%。

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	李珂葛耀君赵林

关键词 ：颤振稳定性, 悬索桥, 气动措施, 主动控制, 风洞试验

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 timedomain 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.

Key words： flutter stability suspension bridge aerodynamic countermeasures active control wind tunnel tests

引用本文:

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.

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http://manu36.magtech.com.cn/Jwk_tmgcxb/CN/ 或 http://manu36.magtech.com.cn/Jwk_tmgcxb/CN/Y2019/V52/I12/93