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題 名 | 利用向量型自我迴歸模型的狀態方程式進行模態參數鑑定=Identification of Modal Parameters by the State Equation of Vector Auto-Regressive Model |
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作 者 | 洪振發; 柯文俊; 戴志豪; | 書刊名 | 中國造船暨輪機工程學刊 |
卷 期 | 17:3 1998.08[民87.08] |
頁 次 | 頁35-44 |
分類號 | 444.1 |
關鍵詞 | 向量型自我迴歸模型; 模態鑑定; 狀態方程式; VAR; Vector auto-regressive model; Modal identification; State equation; |
語 文 | 中文(Chinese) |
中文摘要 | 本文發展一有效的多通道量測結構動態參數的鑑定系統。模態參數如自然頻率、 阻尼比、相對模態形狀和頻率反應函數,能從量測到的動態反應資料,經由向量型自我迴歸 模型來推算。以量測點在離散時間量得之位移、速度或加速度向量,建構向量型自我迴歸模 型(Vector Auto-Regressive model,簡稱VAR model)之狀態運動方程式,以此狀態方程式 之系統矩陣來推算模態參數。本文與以傳統傅氏轉換為基礎的模態分析方法,比較二者的工 作程序和結果差異。最後以一懸臂樑測量例和一加強肋板數值例進行分析,由分析結果可以 確認VAR模型作模態分析較傳統模態分析之優勢。 |
英文摘要 | In this paper an identification system for dynamical parameters, which are determined by the measured data from multiple measuring points on structures has been developed. We derived a state equation of motion for a dynamic system with VAR model. The modal parameters, natural frequencies, damping ratios, mode shapes and frequency response function (FRF) are determined by the system matrix of the state equation. The identification of modal parameters for a cantilever beam was selected as an experimental case and a stiffener plate as a numerical case. Results show that the modal analysis of VAR model has more advantages than conventional FFT approach. |
本系統中英文摘要資訊取自各篇刊載內容。