A new technique for identification of eighteen flutter derivatives using a three-degree-of-freedom section model
A new technique for identification of eighteen flutter derivatives using a three-degree-of-freedom section model
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DOI：
10.1016/j.engstruct.2003.07.002
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发表时间：
2003-12
影响因子：
5.5
通讯作者：
A. Chowdhury;P. Sarkar
中科院分区：
文献类型：
--
作者：
A. Chowdhury;P. Sarkar
颤振不稳定性的预测是柔性结构设计的主要关注点。这就需要识别气动弹性参数，即风洞实验中的颤振导数。颤振导数的提取变得更加具有挑战性的自由度（DOF）的数量从两个增加到三个。由于在识别所有18个颤振导数领域的工作一直是有限的，它激发了一种新的系统识别方法（迭代最小二乘法或ILS方法）的发展，以有效地提取颤振导数使用一个由三自由度弹性悬挂系统悬挂的截面模型。通过比较从所有可能的自由度组合获得的结果来确定特定颤振导数的精度。
The prediction of flutter instability is of major concern for design of flexible structures. This necessitates the identification of aeroelastic parameters, known as flutter derivatives from wind tunnel experiments. The extraction of flutter derivatives becomes more challenging when the number of degrees of freedom (DOF) increases from two to three. Since the work in the field of identifying all 18 flutter derivatives has been limited, it has motivated the development of a new system identification method (iterative least squares method or ILS method) to efficiently extract the flutter derivatives using a section model suspended by a three-DOF elastic suspension system. The accuracy of a particular flutter derivative was determined by comparing the results obtained from all possible DOF combinations.