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題 名 | 小波轉換在地震頻譜上之應用=Application of Wavelet Transform to Earthquake Spectrum Analysis |
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作 者 | 張景鐘; 鄒政憲; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 9:4 1997.12[民86.12] |
頁 次 | 頁605-616 |
分類號 | 354.462 |
關鍵詞 | 小波轉換; 地震反應譜; 非穩態訊號; Wavelet transform; Earthquake response spectrum; Nonstationary signal; |
語 文 | 中文(Chinese) |
中文摘要 | 本文利用小波轉換分析重新建立以小波基為架構的地震動力反應譜,並與傳統的傅利葉轉換動力反應譜作比較。本文首先針對四種不同的小波基做反應譜分析比較,結果發現Daubechies所建構的小波基底D�眾抩A於地震動力反應譜的分析應用,本文同時利用小波的時-頻域分析來探討傳統Fourier分析所無法描述的非穩態訊號特性。由於小波轉換能譜可以描述出不同頻率域下震波能量在時間或上的變化,因此可幫助我們了解非穩態訊號在時間域上的局部變化情形。最後本文也利用小波轉換的技巧來產生符合非穩態訊號特性的人造地震。 |
英文摘要 | Instead of using the traditional Fourier transform, this paper describes the application of the wavelet transform to formulating the earthquake response spectrum. Four different wavelet bases are analyzed and the Daubechies D�� wavelet base is found to be the most suitable for the time-frequency spectrum analysis and non-stationary signal processing. The distribution of seismic energy in differnet frequency ranges in the whole seismic motion time domain can be described by the wavelet transform, whcih helps us in interpreting the variation of non-stationary characteristics at certain local time intervals. Finally, the wavelet transform technique is developed and applied in the generation of suitable artificial accelerograms for seismic motions with strong and non-stationary characteristics. |
本系統中英文摘要資訊取自各篇刊載內容。