相同平台於不同振動試驗機之特性比較

Characteristic Comparisons of the Same Auxiliary Table Applied to Different Vibration Testing Machines

王栢村(Bor-Tsuen Wang) ； 黃俞憲(Yu-Xian Huang) ； 李昆達(David Lee)

《應用聲學與振動學刊》 2卷1期 (2010/04) Pp. 59-69

https://doi.org/10.6282/JASV.2010.2.1.06

摘要

本文主要探討使用相同之垂直輔助平台（簡稱平台）於不同振動試驗機進行試驗之振動特性，並評估平台之平坦度。首先將此平台鎖固於不同試驗機，進行操作模態分析，以求得平台基座激振輸入與平台頂面響應輸出之加速度傳輸比，對此傳輸比進行曲線嵌合即可求得平台在不同試驗機組合下振動模態特性。同時，也對平台於白噪音頻譜之規範激振條件下，進行平台平坦度之實驗量測，並定義平坦度性能指標，以探討平台於搭配不同試驗機之差異。本文也發展平台平坦度之預測方法，也與實驗量測求得之平坦度做比較驗證，結果顯示平台搭配不同試驗機進行試驗時，平台平坦度之預測相當成功，因此可選用不同之控制感測器位置，進行平台平坦度之預測分析與評估，此相同平台搭配不同試驗機之平坦度性能指標可完全預測及校正平台之適用範圍與特性。本文所發展方法可用於實務上平台搭配不同試驗機之平坦度性能評估，也提供一套有效快速於校驗平台平坦度之方法。

關鍵字

垂直輔助平台 ； 操作模態分析 ； 加速度傳輸比 ； 平坦度

並列摘要

This work aims to discuss the use of the same vertical auxiliary table applied to different vibration testing machines and evaluate the table flatness as well as the table vibration characteristics. The same vibration table attached to different vibration testing machines is performed operational modal analysis to obtain the acceleration transmissibility between the base excitation input and the table response output. The vibration modes of the table in conjunction with different machines can also be determined and evaluated as well as the acceleration transmissibility. The experimental measurement of table flatness is also carried out base on the white-noise test specification. The performance indices (PIs) of the table flatness are defined to study the table performances for different machines. A procedure to predict the table flatness performance is then introduced and validated its correctness in comparison to the measured data. Results show the prediction of flatness PIs is successful. Different control sensor locations can then be selected to predict the PIs for different machines. The PIs for the table used in different machines can be characterized. The developed methodology is useful for the practical application of the table to different machines and provides evaluation tool to calibrate the table performance, especially for different vibration test machines.

並列關鍵字

Vertical Auxiliary Table ； Operational Modal Analysis OMA ； Acceleration Transmissibility ； Flatness