Active winglets, with a manually controlled attitude angle, can take advantage of the self-excited force to suppress the flutter tendency of a bridge girder. Previous studies mostly focused on the effectiveness and robustness under long-term closed-loop control. However, the deck-winglet system’s short-term response, due to the memory effect of the aerodynamic force, is of concern. A bridge sectional model with active winglets was developed to investigate this problem. Experiments with different phase shifts between the members of the winglet pair were carried out in a wind tunnel. We found that the influence residue of an instantaneous change of the control pattern lasted about three pitching cycles, indicating that a large control interval was acceptable for practical applications. A theoretical relationship between the control effect and control phase was derived to explain the results of the open-loop control. The system responses under different control intervals were analyzed by the closed-loop control, demonstrating that a large control interval was acceptable if some time-consuming algorithms are used in a practical bridge’s flutter control operation.

中文翻译：

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主动颤振控制下桥翼截面模型的短期响应

具有手动控制姿态角的主动小翼可以利用自激力来抑制桥梁的颤振趋势。以前的研究主要集中在长期闭环控制下的有效性和鲁棒性。然而，由于空气动力的记忆效应，甲板小翼系统的短期响应值得关注。开发了带有活动小翼的桥梁截面模型来研究这个问题。在风洞中进行了小翼对成员之间不同相移的实验。我们发现控制模式的瞬时变化的影响残留持续了大约三个俯仰周期，这表明大的控制间隔对于实际应用是可以接受的。推导出控制效果和控制相位之间的理论关系来解释开环控制的结果。通过闭环控制分析了不同控制区间下的系统响应，表明如果在实际桥梁颤振控制操作中使用一些耗时的算法，较大的控制区间是可以接受的。