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某型飞机颤振试飞数据的模态参数识别
引用本文:陈奎孚,焦群英.某型飞机颤振试飞数据的模态参数识别[J].航空学报,2003,24(6):526-530.
作者姓名:陈奎孚  焦群英
作者单位:中国农业大学,理学院,北京,100083
摘    要: 地面模态试验表明某机型的机翼对称一阶弯曲与发动机对称俯仰频率比较接近。为了检查这两阶模态是否会在设计的飞行速度下引起颤振,在不同飞行速度下利用脉冲激励方式测量了频响函数。这组频响函数不仅在关心频段存在密集模态,而且受噪声干扰严重。采用了修正的整体正交多项式识别方法(引入额外的加权函数来降低估计的方差,分子和分母引入采用相同的正交基) , 对这组数据进行了模态分析,并利用一些先验信息和规则从拟合模态鉴别出真实模态。研究表明机翼对称一弯和发动机对称俯仰的两阶模态的频率随速度增加而趋近,两阶阻尼比均随速度增加而下降,但是在设计速度下,模态参数离颤振有较大裕量。

关 键 词:颤振  飞行实验  模态分析  脉冲激励  正交多项式  
文章编号:1000-6893(2003)06-0526-05
修稿时间:2002年10月29

Modal Parameters Identification of an Aircraft under Flutter Test Flying
CHEN Kui-fu,JIAO Qun-ying.Modal Parameters Identification of an Aircraft under Flutter Test Flying[J].Acta Aeronautica et Astronautica Sinica,2003,24(6):526-530.
Authors:CHEN Kui-fu  JIAO Qun-ying
Institution:College of Science; China Agricultural University; Beijing 100083; China
Abstract:For a concerned plane, ground modal experiments show that there are 2 order modals whose frequencies are close,which correspond to the 1st order bent modal of wing (FBMW) and symmetric pitching modal of engine(SPME), respectively. To evaluate whether these two modals cause flutter under design flying speed, the frequency response functions (FRFs) under different flying speeds were measured through a pulsing excitation method. Due to the constriction, these FRFs were based on single measurement; hence their ratios of signal to noise were very low, in addition to the dense modals in the concerned frequency bands. The modifying orthogonal polynomial (such as introducing extra weighting factors to reduce the variance of estimation, choosing both bases of the denominator and numerator as identical orthogonal polynomial) was exploited to modal analysis, and the related apriority information was taken use of picking off the pseudo modals. The studies show that, as the fly speed increasing, the frequencies of FBMW and SPME approach to each other, and their damping ratios descend; however as for the modal parameters under design flying speed, there is still much wide margin to flutter.
Keywords:flutter  flight test  modal analysis  pulse excitation  orthogonal polynomial
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