加载头不确定度评定方法研究
发布时间：2019-04-29 20:52
【摘要】：在风洞天平校准系统中,加载头的主要功能是保证力的三要素中"作用点"位置的准确。然而,由于加工制造误差和尺寸测量误差的存在,加载头施力点的实际位置总是会偏离其相应的理论正确位置,从而导致施力点位置坐标产生误差。这些误差会经由加载头传导到天平校准公式中,从而影响天平载荷测量的准确性。因此,有必要对加载头不确定度的评定方法进行研究。首先采用GUM(guide to the expression of uncertainty in the measurement,ISO/IEC GUIDE 98-3:2008)方法建立了加载头不确定度的评定方法和步骤,接着给出了加载头不确定度的表示方法及指标要求,最后以某加载头为例,给出了不确定度评定的详细过程及结果。结果表明,该型加载头各施力点位置坐标的扩展不确定度平均值为0.044mm;力矩力臂的相对扩展不确定度平均值为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%.
【作者单位】： 中国空气动力研究与发展中心低速空气动力研究所;
【分类号】：V211.74
[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%.
【作者单位】： 中国空气动力研究与发展中心低速空气动力研究所;
【分类号】：V211.74
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1 黄志澄;风洞测力试验数据的随机不确定度[J];气动实验与测量控制;1987年01期
2 梁志国,孙t熡，
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