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題名 | 應用電子斑點干涉術量測平板振動及反算材料常數=The Vibrating Measurement of Plates and Inverse Evaluation of Material Constants by Using ESPI Method |
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作者 | 黃吉宏; 馬劍清; | 書刊名 | 力學 |
卷期 | 14:2 1998.12[民87.12] |
頁次 | 頁71-81 |
分類號 | 440.2 |
關鍵詞 | 電子斑點干涉術; 振動; 反算; Electronic speckle pattern interferometry; Vibration; Inverse evaluation; |
語文 | 中文(Chinese) |
中文摘要 | 本文應用振幅變動法電子斑點干涉術(AF-ESPI)以實驗量測等向性平板的共振頻 率與振型,並利用量測所得之振頻,反算等向性材料之材料常數,文中分別以圓形及方形兩 種平板,在周邊自由之邊界條件下,作為理論及實驗之探討,最後並利用超音波檢測及有限 元素法計算來加以佐證。利用光學的電子斑點干涉術做為物體振動量測之特點,在於獲得振 頻的同時,亦可得到其對應之振型的全場圖。文中以鋁材及玻璃兩種材料為提出的ESPI光 學實驗以求材料常數是一個可行的方法。 |
英文摘要 | In this study, the Amplitude Fluctuation Electronic Speckle Pattern Interferometry (AF- FSPI) is used for measuring the resonant frequencies and mode shapes of isotropic plates. Making use of the resonant frequencies for free plates obtained experimentally, an inverse evaluation for the material constants is investigated. Finally, ultrasonic method as well as finite element calculation are used and the results are compared with the experimental measurements. The advantage of ESPI for vibration measurement is that we can obtain the resonant frequency and the correspondent mode shape at the same time. From the experimental results of aluminum and glass obtained in this study, it shows that the numerical calculation and the experimental results agree fairly well for both the resonant frequencies and the mode shapes. Hence the experimental method based on optical ESPI setup proposed in this study might be an applicable way to evaluate material constants. |
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