Flight Flutter Modal Parameters Identification with Atmospheric Turbulence Excitation Based on Wavelet Transformation

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Flight Flutter Modal Parameters Identification with Atmospheric Turbulence Excitation Based on Wavelet Transformation

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摘要

In view of the feature of flight flutter test data with atmospheric turbulence excitation, a method which combines wavelet transformation with random decrement technique for identifying flight flutter modal parameters is presented. This approach firstly uses random decrement technique to gain free decays corresponding to the acceleration response of the structure to some non-zero initial conditions. Then the continuous Morlet wavelet transformation of the free decays is performed; and the Parseval formula and residue theorem are used to simplify the transformation. The maximal wavelet transformation coefficients in different scales are searched out by means of band-filtering characteristic of Morlet wavelet, and then the modal parameters are identified according to the relationships with maximal modulus and angle of the wavelet transform. In addition, the condition of modal uncoupling is discussed according to variation trend of flight flutter modal parameters in the flight flutter state. The analysis results of simulation and flight flutter test data show that this approach is not only simple, effective and feasible, but also having good noise immunity.

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《中国航空学报（英文版）》 |2007年第5期|394-401|共8页
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Department of Automatic Control, Northwestern Polytechnical University, Xi'an 710072, China;

Department of Automatic Control, Northwestern Polytechnical University, Xi'an 710072, China;

The Engineering Institute, Air Force Engineering University, Xi'an 710038, China;

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原文格式 PDF
正文语种 chi
中图分类航空;
关键词
flight flutter modal parameters identification; atmospheric turbulence excitation; wavelet transformation; random decrement technique; acceleration response;

机译：飞行颤振模态参数识别;大气湍流激发;小波变换随机减量技术;加速响应;

Flight Flutter Modal Parameters Identification with Atmospheric Turbulence Excitation Based on Wavelet Transformation

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