二階段結構損傷偵測分析法

Two-Stepped Structural Damage Detection Method

江達雲(Dar-Yun Chiang) ； 賴文一(Wen-Yi Lai)

《中國航空太空學會學刊》 30卷1期 (1998/03) Pp. 19-26

https://doi.org/10.6124/TAASRC.199803_30(1).03

摘要

在本研究中，以系統識別理論觀點，針對結構系統有限元素模型之特性，指出用以進行損傷偵測分析之系統輸出資料應位於分析模型可良好模擬之範園，並提出二階段損傷偵測法。第一階段進行損傷位置的標定，以模態力平衡法，標定可能受損之元件（或子結構），以減少待識別參數之數目。第二階段再進行損傷程度的評估，以求得元件損傷的程度。其中識別損傷度之最佳化分析，本研究採用模擬演化法，可收斂至全域最小值，避開了傳統最佳化方法常收斂至局部最小值的問題。數值模擬分析結果顯示，二階段損傷偵測法在適當條件下可有效地求得結構損傷的部位及程度。

關鍵字

系統識別 ； 有限元素模型 ； 結構損傷偵測 ； 模擬演化法

並列摘要

In this paper, a two-stepped structural damage detection method is proposed. In the first step (damage localization), structural elements that are possibly damaged are located using modal residual force method. In the second step (damage extent evaluation), the extent of damage of the structural elements that are identified in the first step will be evaluated. Using numerical simulations, results of damage detection of a chain model and a vibrating rod using different detection techniques are obtained and discussed. It is pointed out that the model used for damage detection must well represent the dynamic system of interest in order to obtain reliable resu1ts of damage detection. The applicability of the proposed two-stepped damage detection method is demonstrated by considering damage detection of a simulated truss structure.

並列關鍵字

system identification ； finite element model ； structural damage detection ； simulated evolution