頁籤選單縮合
題名 | Determination of Resonance Frequency of Two-dimensional Alluvial Valley by Background Phase Subtraction Method= |
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作者 | Teng,Tsung-jen; Chai,Juin-fu; Yeh,Chau-shioung; |
期刊 | The Chinese Journal of Mechanics |
出版日期 | 19980300 |
卷期 | 14:1 1998.03[民87.03] |
頁次 | 頁1-15 |
分類號 | 334.22 |
語文 | eng |
關鍵詞 | T-matrix; Resonance scattering theory; Resonance frequency; Background phase subtraction method; |
英文摘要 | This paper is to develop the background phase subtraction method to determine the resonance frequency of a two-dimensional alluvial valley subjected to an incident plane SH-wave. The scattered wave due to the alluvium can be expressed in a series of basis functions,and the associated coefficients are related to the coefficients of free field by the so-called T-matrix method. By applying the resonance scattering theory, the effects among all normal modes can be decoupled, and hence one can obtain the phase shift of each eigen partial wave. Similarly, the phase shift of each eigen partial wave due to a canyon with the same geometrical shape of the alluvium can be determined, and is recognized as the background effect. Furthermore, based on the phase represented scattering matrix, the resonance frequencies of each normal mode and its overtones can be determined by the subtraction of the associated phase dependent function due to the canyon from that dur to the alluvium. |
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