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題名 | Effects of Boundary Perturbations on Dynamic Structural Model Updating=邊界變動對有限元素分析模型更新之影響 |
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作 者 | 陳坤男; | 書刊名 | 東南學報 |
卷期 | 22 1999.12[民88.12] |
頁次 | 頁59-72 |
分類號 | 310.15 |
關鍵詞 | 邊界變動; 模型更新問題; 廣義逆矩陣法; 加點質量法; Boundary perturbations; Model updating; Pseudoinverse; Mass additive technique; MAT; Multiple boundary condition testing; MBCT; |
語文 | 英文(English) |
中文摘要 | 本文探討邊界變動對以實驗數據更新有限元素分析模型方法之影響。模型更新問 題可被改寫成限制性最佳化問題,其解可以廣義逆矩陣法求之,該限制性最佳化問題並包含 一懲罰函數項,可使以廣義逆矩陣法求得之最小平方解滿足所有限制條件。變動邊界模型可 經由增加點質量於節點或限制節點之自由度等兩種方法而產生,由文中之例題顯示,限制節 點之自由度為較佳之方法,能獲致較佳的結果;且越多的變動邊界模型可使更新後之有限元 素分析模型設計參數越趨近正解。 |
英文摘要 | Tuning dynamic, structural models using experimentally measured, perturbed boundary condition test data is presented and the effects of boundary perturbations generated by either constraining or adding masses to finite element nodal points are examined in this paper. The model-updating problem is formulated in a form of constrained optimization problem, which is solved using the generalized inverse method. Penalty terms created by a set of dummy variables and weighting factors gradually force the least-squares solution to satisfy prescribed side constraints and to stay within the feasible area. Numerical results have shown that hinging nodes, to create PBC models, produces better results than adding masses does. Results also show that mixing of both types of perturbations gains no advantages. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。