淡江大學機構典藏:Item 987654321/121386
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    題名: On the linkage between influence matrices in the BIEM and BEM to explain the mechanism of degenerate scale for a circular domain
    作者: Jeng-Tzong Chen;Jia-Wei Lee;Yi-Ling Huang;Cheng-Hsiang Shao;Cheng-Hsuan Lu
    關鍵詞: degenerate scale;BEM;degenerate kernel;circulant matrix
    日期: 2021-03-18
    上傳時間: 2021-09-25 12:11:07 (UTC+8)
    出版者: Cambridge University Press
    摘要: In this paper, we proposed two ways to understand the rank deficiency in the continuous system (boundary integral equation method, BIEM) and discrete system (boundary element method, BEM) for a circular case. The infinite-dimensional degree of freedom for the continuous system can be reduced to finite-dimensional space using the generalized Fourier coordinates. The property of the second-order tensor for the influence matrix under different observers is also examined. On the other hand, the discrete system in the BEM can be analytically studied, thanks to the spectral property of circulant matrix. We adopt the circulant matrix of odd dimension, (2N + 1) by (2N + 1), instead of the previous even one of 2N by 2N to connect the continuous system by using the Fourier bases. Finally, the linkage of influence matrix in the continuous system (BIE) and discrete system (BEM) is constructed. The equivalence of the influence matrix derived by using the generalized coordinates and the circulant matrix are proved by using the eigen systems (eigenvalue and eigenvector). The mechanism of degenerate scale for a circular domain can be analytically explained in the discrete system.
    關聯: Journal of Mechanics 37, p.339-345
    DOI: 10.1093/jom/ufab003
    顯示於類別:[土木工程學系暨研究所] 期刊論文

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