传统上，结构颤振导数(Flutter Derivative)之识别采用自由振动方式，但其实验结果常受周遭试验环境影响，而且将自由振动频率当成外力扰动频率亦会造成结果上之误差。
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The fundamental methods for flutter analysis and the current status of aerodynamic derivative identification are reviewed at first in this thesis.
本文首先回顾了大跨度桥梁颤振分析的基本方法和气动导数识别方法的研究现状。
A direction derivative method for the analysis of the effects of asymmetric stores on flutter speed is presented.
提出了一种分析不对称外挂对飞机颤振影响的方向导数法。
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