Research of data process methods and model excitation for transonic flutter experiments in wind tunnel
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摘要: 简述了几种主要激励方法在颤振实验中的优缺点,分别用瞬态激励、有限带宽白噪声激励和单频激励进行地面模态实验,测量机翼模型的振动响应,并用STD、ARMA和复指数模态参数识别等时域方法识别固有频率和模态阻尼,通过与软件计算结果对比分析得知,实测的固有频率与计算结果吻合很好.Abstract: The advantages and disadvantages of some main excitation methods for the flutter experiments are briefly described in the paper.Then the ground-model experiments were conducted by using impulse excitation,finite-bandwidth white noise excitation and harmonic excitation,and the structural response was measured at the same time.On the base of STD,ARMA and LSCE,the frequency and damping ratio were identified.Through comparing and analyzing them and the results from NASTRAN,the influence of model exciting techniques and parameters identification methods were discussed.Finally,the optimal scheme of model excitation and parameter identification was evaluated for flutter test techniques.
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