振動隔絕應用於加速規絕對校正

Vibration Isolation Technique Applied to Accelerometer Absolute Calibration

黃宇中(Yeu-Jong Huang) ； 李百堂(Bai-Tang Lee) ； 崔廣義(Kuang-Yih Tsuei) ； 黃少琦(Shau-Chi Hwang) ； 楊長江(Tsang-Chiang Yang)

《中華民國振動與噪音工程學會論文集》 1996 (1996/04) Pp. 385-390

https://doi.org/10.30028/CSSVANNUAL.199604.0385

摘要

度量衡國家標準實驗室之振動加速規靈敏度絕對校正系統，是利用光學干涉原理，量測振動加速規微小位移，轉換成加速度，進而求得靈敏度。因此，些微的外來干擾如地板振動、激振器傳遞的結構振動、溫度變化、氣流擾動及加速規的安裝方式等，都足以影響量測數據的準確性。然而設計良好的隔振平台，以隔絕外來振動及防止激振器本身振動的傳遞，是此系統改良的首要課題。
此平台不但要剛性強質量夠，其重量至少為激振器可動部份（含振動加速規、鏡片、調整座及電樞等）重量和2000倍以上，且可調整水平面（三點粗調、四點微調）以產生干涉光共線的功能。經由重新設計製造，此量測系統（平台、激振器及振動加速規）之共振頻率(13KHz)高於工作頻率(50~10 KHz)，且振動加速規輸出電壓靈敏度特性符合固有性質，故此隔振平台確已發揮功能達到隔絕振動作用。

關鍵字

振動加速規 ； 靈敏度 ； 振動隔絕

並列摘要

Measuring micro-vibration by laser interferometry, the sensitivity of an accelerometer can be determined by the absolute calibration system. It is a primary calibration system and accuracy of measurement is influenced by any micro-interference. The performance of vibration isolation table and mounting method of accelerometers contribute to the main part of the system improvement.
A stiff and massive block with a mass at least 2000 times the total mass of moving elements of shaker, fixture, reflecting mirror, and transducer is designed to isolate the floor vibration. The horizontal surface of the block can be adjusted to achieve alignment of the laser beams. After improvement, the resonant frequency of the measurement system which includes the block, shaker, reflecting mirror, and accelerometer is higher than the operating frequency. The measured sensitivity matches the trend of the accelerometer characteristics. The function of the massive table has been achieved in a vibration isolation point of view.

並列關鍵字

Accelerometer ； Sensitivity ； Vibration Isolation