【摘要】 以JJF 1059.1-2012《测量不确定度评定与表示》为依据,结合数学模型,计算出相关灵敏度系数,分析并评价影响煤真相对密度不确定度的每一个因素。结果表明:真相对密度合成标准不确定度为0.014,扩展不确定度为0.028,测定结果的不准确性主要由干燥煤样质量m_d(不确定度为4.4×10^-4)引入,而测定试样的M_ad（不确定度为0.029）是m_d不确定度偏大的主要原因。更多还原

【Abstract】 Based on the standard JJF1059.1-2012 "Evaluation and expression of uncertainty in measurement", the main sources of uncertainty in measuring of true relative density of coal were analyzed, the sensitivity coefficient of each component was calculated, and each uncertainty component was evaluated. The result showed that the combined standard uncertainty of true relative density was 0.014 and expanded uncertainty was 0.028. The inaccuracy of the results was mainly caused by the quality m_d of dried coal(the uncertainty was 4.4×10^-4), while the M_ad（the uncertainty was 0.029） of the measured sample was the main reason for the high uncertainty of the m_d.更多还原