發(fā)布時間：2019-04-29 20:52

【摘要】：在風洞天平校準系統(tǒng)中,加載頭的主要功能是保證力的三要素中"作用點"位置的準確。然而,由于加工制造誤差和尺寸測量誤差的存在,加載頭施力點的實際位置總是會偏離其相應的理論正確位置,從而導致施力點位置坐標產(chǎn)生誤差。這些誤差會經(jīng)由加載頭傳導到天平校準公式中,從而影響天平載荷測量的準確性。因此,有必要對加載頭不確定度的評定方法進行研究。首先采用GUM(guide to the expression of uncertainty in the measurement,ISO/IEC GUIDE 98-3:2008)方法建立了加載頭不確定度的評定方法和步驟,接著給出了加載頭不確定度的表示方法及指標要求,最后以某加載頭為例,給出了不確定度評定的詳細過程及結(jié)果。結(jié)果表明,該型加載頭各施力點位置坐標的擴展不確定度平均值為0.044mm;力矩力臂的相對擴展不確定度平均值為0.0072%。
[Abstract]:In the wind tunnel balance calibration system, the main function of the loading head is to ensure the accuracy of the "action point" position in the three elements of the force. However, due to the existence of manufacturing error and dimension measurement error, the actual position of the loading point always deviates from the corresponding theoretical correct position, which leads to the error of the position coordinates of the loading point. These errors are transmitted to the balance calibration formula by the loading head, thus affecting the accuracy of the balance load measurement. Therefore, it is necessary to study the evaluation method of the uncertainty of loading head. Firstly, the evaluation method and steps of the uncertainty of loading head are established by using GUM (guide to the expression of uncertainty in the measurement,ISO/IEC GUIDE 98 / 3 (2008) method, and then the expression method and index requirement of the uncertainty of loading head are given. Finally, taking a loading head as an example, the detailed process and results of uncertainty evaluation are given. The results show that the average value of the extended uncertainty of the position coordinates of the loading head is 0.044 mm and the average value of the relative expansion uncertainty of the moment arm is 0.0072%.
【作者單位】： 中國空氣動力研究與發(fā)展中心低速空氣動力研究所;
【分類號】：V211.74

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1 黃志澄;風洞測力試驗數(shù)據(jù)的隨機不確定度[J];氣動實驗與測量控制;1987年01期

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