【作者】 宋汉文； 王丽炜； 王博瑜； 施峥嵘；

【Author】 SONG Han-wen, WANG Li-wei, WANG Bo-yu, Sffl Zheng-rong(Department of Mechanics and Engineering science, Fudan University. Shanghai 200433)

【机构】 复旦大学力学与工程科学系；

【摘要】 气动导数辨识是桥梁颤振及抖振研究的核心和关键问题,现有文献的主要方法是基于对系统自由振动响应数据的拟合,通过时域模态分析方法来识别气动导数。本文首先推导均匀流场中桥梁气动弹性的非经典线性系统动力学微分方程及其在各种激励条件下响应的数学表达式;然后,分别导出了结构在初始条件激励、正弦激励、随机激励和未知白噪声激励(无法测量)等四种情况下参数辨识的模型与算法,并对数据稳定性等进行了讨沦,提出了紊流风场中气动导数辨识研究的方法。更多还原

【Abstract】 Aerodynamic derivatives identification is the focuses of study in bridge flutter and buffeting. The prevailing techniques are based on the free vibrating measurements, and extract the parameters by the method of time domain modal analysis. In this paper, the solution equations of non-classical linear aerodynamic system under varied inputs are derived firstly. Then, the models and algorithms for identification of bridge flutter derivatives applied on initial conditions, sinusoidal exciting, random exciting and unmeasured white noise inputs, are developed respectively. Finally, the scheme of aerodynamic derivatives identification on the turbulent flow is proposed.更多还原