激振器橫向運動造成加速規校正之不確定度之影響

振動量測需求上，加速規一直是最直接且能夠反映出待測物振動現象與特性的感測器。選擇合適的加速規類型，才能夠正確地量測出待測物確切的振幅大小與頻率特性。加速規本身的感測器特性，會對量測誤差產生一定大小的貢獻量。透過加速規進行校正得出的靈敏度數值，再配合校正計算過程中產生的量測不確定度，可以對此加速規特性有進一步的了解。在比較級校正系統中，由於加速規的架設安裝因素會造成量測誤差的產生。其中，因系統重心改變的情況下，產生額外的橫向作動，橫向作動產生的輸出電壓會造成校正數值的差異與變化，進而增加量測不確定度的產生。因此本文透過系統激振2個不同型號的加速規，將三軸向電壓輸出結果求出，透過公式計算得出橫向電壓與激振方向電壓之比值，並以頻譜圖方式表示，了解其比值，並以此為基點希望能探討出加速規本身的其他特性。

關鍵字

振動；加速規；校正系統；橫向運動；量測不確定度

並列摘要

This paper discusses the resulting effects on accelerometer comparison calibration accuracy and uncertainty. Vibration phenomena are present around us in everything that moves. The accelerometer is a class of instruments commonly used to measure that motion. Accurate accelerometer calibration is a way to provide physical meaning to this electrical output and it is a prerequisite for quality motion measurement. When we talk about accelerometer calibration we are referring essentially to the measurement of sensitivity. The most common way to calibrate accelerometer sensitivity is by comparison to reference transducer. The sensor under test (SUT) is mounted on a back-to-back arrangement against a reference accelerometer and both sensors are subjected to exciter. Since the motion input is the same for both devices, the ratio of their outputs is also the ratio of their voltage which may be contaminated by the transverse motion. Referring to the dedicated vibration direction, the transverse motion of the exciter was investigation by a tri-axial sensor. Systems and standards on comparison methods for accelerometers calibration are discussed, providing an overview on current technology available for calibrating and testing accelerometer performance characteristics.

並列關鍵字

vibration ； calibration system ； transverse motion ； uncertainty of measurement ； accelerometers

國際替代計量

激振器橫向運動造成加速規校正之不確定度之影響

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