| Estimation of structural modal parameters by fourier transform with an optimal window |
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| 作者姓名： | 朱宏平 万信华 |
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| 作者单位： | School of Civil Engineering ＆ Mechanics, Huazhong University of Science ＆ Technology, Wuhan 430074, China |
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| 基金项目： | Sponsored by the National Natural Science Foundation of China （Grant No. 50378041 ） and the Specialized Research Fund for the Doctoral Program of Higher Education （Grant No. 20030487016）. |
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| 摘 要： | An adaptive Fourier Transform （FT） with an optimal window has been proposed for the time-frequency analysis of nonstationary time series. The method allows for a good estimation of both frequency and amplitude of the spectrum and can be easily applied to the general case of time-varying signals. The evaluation of the proposed approach has been performed on measured time-varying signals from a suspension bridge model and a steel frame model whose data have the typical non-stationary characteristics. The numerical results show that the proposed approach can overcome some of the difficulties encountered in the classic Fourier transform technique and can achieve higher computation accuracy.
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| 关 键 词： | 快速傅立叶变换 时频分析 时间序列 光谱分析 |
| 文章编号： | 1005-9113（2005）05-0595-04 |
| 收稿时间： | 2003-12-01 |
Estimation of structural modal parameters by fourier transform with an optimal window |
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| Zhu HongPing;Wan XinHua.Estimation of structural modal parameters by fourier transform with an optimal window[J].Journal of Harbin Institute of Technology,2005,12(5):595-598. |
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| Authors: | Zhu HongPing;Wan XinHua |
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| Abstract: | An adaptive Fourier Transform (FT) with an optimal window has been proposed for the time-frequency analysis of nonstationary time series. The method allows for a good estimation of both frequency and amplitude of the spectrum and can be easily applied to the general case of time-varying signals. The evaluation of the proposed approach has been performed on measured time-varying signals from a suspension bridge model and a steel frame model whose data have the typical non-stationary characteristics. The numerical results show that the proposed approach can overcome some of the difficulties encountered in the classic Fourier transform technique and can achieve higher computation accuracy. |
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| Keywords: | short-time fourier transform optimal window length modal parameters engineering structures |
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