當日教材下載聯結如下:
講師簡介
國立中正大學機械工程系 博士
課程簡介
結構之自然頻率主要取決於其幾何外型、邊界條件及材料參數等，其數值可藉由量測得知。擁有系統之自然頻率資訊才能有效制訂機械系統之操作頻率範圍，避免運作頻率及其相關之倍頻激振引發結構產生共振。本課程之目的在於利用輸入之激振訊號以及輸出之結構振動訊號的相關特性估測出系統自然頻率。首先介紹輸入與輸出訊號之時間域自我與交互相關函數計算，再將其轉換至頻率域以求得自我頻譜與交互頻譜函數，即可利用這些函數計算出系統之頻率響應函數及輸入與輸出訊號之相干函數，而藉由頻率響應函數之大小、相位和相干函數之大小即可判斷系統自然頻率之所在位置。
課程大綱
A. 相關函數之計算(時間域)
(1) 自我相關(Auto-correlation)函數之計算
(2) 交互相關(Cross-correlation)函數之計算
B. 相關頻譜之計算(頻率域)
(1) 自我頻譜(Auto-spectrum)之計算
(2) 交互頻譜(Cross- spectrum)之計算
C. 結構自然頻率之估測
(1) 結構轉換函數(Transfer function)之計算
(2) 自然頻率之估測：由轉換函數之增益(Gain)與相位(Phase)判斷
靜態敲擊測試 - FEM模型
(點圖可放大)
動態變轉速共振測試 - FEM模型
(點圖可放大)
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