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航空学报  2015 

飞机操稳特性大导数辨识及随机噪声影响分析

DOI: 10.7527/S1000-6893.2014.0332, PP. 2177-2185

Keywords: 大导数辨识,随机噪声,操稳特性,响应模态,小扰动理论

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Abstract:

针对飞机研制中操稳特性需求,分别讨论了小扰动理论和参数辨识两种获得飞机稳定和操纵大导数的分析手段,由两种气动布局比较接近的小型无人机ANCE和大型客机Boeing747数据验证了参数辨识方法的有效性和辨识结果的正确性。在此基础上对两者进行了大导数辨识,并由MonteCarlo仿真分析了飞行试验测量中的随机噪声对大导数辨识精度和模态响应特征值的影响。结果表明随机噪声对由飞机固有气动特性决定的一些相对较小的大导数辨识精度影响较大,而部分大导数辨识精度较高;随机噪声对长周期和螺旋模态特征值影响较大,短周期、荷兰滚和滚转模态特征值辨识分析结果较为可信。

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