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在评定飞机的飞行品质时,自然频率、相对阻尼等模态参数是极为重要的.本文介绍了从飞行试验数据中提取模态参数的几种方法。文章的前一部分介绍了运动轨迹分析法,包括一般收敛振荡分析方法、大阻尼振荡分析方法及非周期衰减运动分析方法;而后一部分介绍了参数估计方法,包括迭代探索法和求特征根方法。这些方法都可以应用于飞行试验数据分析.
In assessing the flight quality of aircraft, the modal parameters such as natural frequency and relative damping are very important.In this paper, several methods for extracting modal parameters from flight test data are introduced. The first part of the article introduced the motion trajectory analysis method, including the general convergence oscillation analysis method, the large damping oscillation analysis method and the non-periodic decaying motion analysis method. The second part introduces the parameter estimation methods, including the iterative method and the eigenvalue method. These methods can be applied to flight test data analysis.