Wavelet Identification of Flight Flutter Modal Parameters with Sweep Excitation

Tang Wei Shi ZhongKe

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (2) : 172-177.

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (2) : 172-177.
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Wavelet Identification of Flight Flutter Modal Parameters with Sweep Excitation

  • Tang Wei Shi ZhongKe
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Abstract

A flutter modal parameters identification method using continuous wavelet transform is presented, which is applied to flight flutter testing excited by linear sweep. This method firstly employs fractional Fourier transform to filter noisy data, and then derives the impulse response from estimated frequency response function. Lastly, Continuous wavelet transform is used to extract modal parameter from impulse response. For reasons of local property of linear sweep in fractional Fourier domain and bandwidth property of Morlet wavelet, the proposed method is particularly efficient when dealing with significantly noisy data. The performance and the required conditions of using this method are discussed. Finally, the efficiency of this method is illustrated by real flight data.

Key words

Fractional Fourier Transform / Continuous wavelet transform / Sweep excitation / Flight flutter testing

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Tang Wei Shi ZhongKe. Wavelet Identification of Flight Flutter Modal Parameters with Sweep Excitation [J]. Journal of Vibration and Shock, 2009, 28(2): 172-177

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