單平面風扇動平衡系統之誤差源及不確定度評估

The Error Sources and Uncertainty Assessment for Single-Plane Fan Dynamic Balance System

王聖涵(Sheng-Hang Wang) ； 黃宇中(Yeu-Jong Huang)

《應用聲學與振動學刊》 3卷1期 (2011/04) Pp. 31-37

https://doi.org/10.6282/JASV.2011.3.1.04

摘要

本文提供轉子或風扇於生產線之產品量測儀器標準化。該系統量測訊號主要包含有電腦控制訊號輸出，雷射偵測轉子之轉速及加速規量測振動訊號，經由計算後可以判斷轉子之不平衡位置處及平衡等級，並由ISO 1940-2中之方法驗證動平衡轉子系統。本文以經驗方式評估動平衡系統之不確定度，遵循國際標準組織(ISO)所建議之「量測不確定度表示方法指引」（Guide to the Expression of Uncertainty in Measurement，以下簡稱ISO GUM）評估動平衡系統之性能，以此作為量測儀器平衡等級一個基準。經評估後，系統能量平衡等級最佳狀態符合ISO 1940平衡等級G 0.2，利用塑膠螺絲作為已知標準試重30 mg，加入系統模擬不平衡標準質量，比較系統有、無試重之不確定度評估，質量方面差異約1 mg以下，角度約有10%之差異。並評估系統在無試重不同轉速下，進行風扇動平衡機之不確定度評估，在10,000 rpm角度之不確定度較高。系統評估後規格，在10,000 rpm可達到質量誤差＜1 mg，補償角度誤差＜2°，量測最小不平衡量0.2 g mm，預期由計量型轉子校正系統可量化不同試重及轉速之不確定度，提供生產線上之動平衡機有一標準化指標。

關鍵字

動平衡系統 ； 不確定度評估 ； 標準轉子

並列摘要

The purpose is to provide the standardization of measurement instrument for products in a production line. Signals measured by that system include computer-controlled signal output, rotor speed detected by a laser and vibration signals measured by an accelerometer, which can determine the imbalance location of a rotor and balance level after the calculation as well as verify the rotor system of dynamic balance by the methods in ISO 1940-2. This study empirically assesses the uncertainty of dynamic balance system, which follows ”Guide to the Expression of Uncertainty in Measurement (referred to as ISO GUM below)” proposed by the ISO to assess the performance of dynamic balance system as a standard of balance level for measurement instrument. After assessed, the best status of the balance level for system energy conforms to the balance level G 0.2 of ISO 1940. Using plastic screw as known standard mass 30 mg adds the system to simulate the mass of imbalance standard. After the system uncertainty with and without mass is assessed, the mass difference is very small and the angle difference is about 10%. The system is assessed at different rpm without mass. The results show the uncertainty of fan dynamic balancing machine is higher at 10,000 rpm, which can achieve the mass error＜1 mg, compensation degree error＜2° and minimum measured balance is 0.2 g mm. The uncertainties at different mass and rpm can be assessed in the future to provide each kind of on-line fan manufacture.

並列關鍵字

Dynamic Balance System ； Uncertainty Evaluation ； Standard Rotor