基于自由振动响应识别颤振导数的特征系统实现算法

桥梁断面的颤振导数在研究桥梁风致颤振稳定性上扮演着重要的角色，通常通过节段模型风洞试验获得。提出采用时域特征系统实现算法来识别节段模型振动系统的模态参数，进而提取桥梁断面颤振导数的方法。为验证该方法的可行性，进行了二自由度流线型薄平板节段模型自由振动风洞试验，并将识别的气动导数值与Theodorsen理论解进行了比较。

Identification of Flutter Derivatives by Using Eigensystem Realization Algorithm

Bridges flutter derivatives play an important role in wind resistance researches of long-span bridges. The flutter derivatives are commonly obtained through wind tunnel test on section model of bridge decks. In the paper, time domain Eigensystem Realization Algorthm (ERA) is developed to evaluate the flutter derivatives of bridge decks based on two DOF free decay vibration tests in wind tunnel. To verify the method and numerical implementation, a wind tunnel test on a thin plate model is carried out to identify its flutter derivatives, which are then compared with Theodorsen theoretic solutions.