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本文根据重力分选的理论和数理统计原理研究了分配曲线的形态及特性参数。研究结果表明,只有在某些特定的条件下,分配曲线的形状才能与正态分布的累积概率曲线相符。实际的分选过程不可能满足这些条件。因此,无论是可能偏差E_p或机械误差I值,均不可能全面地反映分配曲线的特性。为了全面地描述分配曲线的特性,作者提出了一组新的特性参数,它们是:有效分选比重的数学期望的分布中心δ_c,标准差σ及偏度系数S_p。
In this paper, the morphology and characteristic parameters of distribution curve are studied according to the theory of gravity separation and the principles of mathematical statistics. The results show that only under certain conditions, the shape of the distribution curve can be consistent with the cumulative probability curve of the normal distribution. The actual sorting process can not meet these conditions. Therefore, it is impossible to fully reflect the characteristics of the distribution curve whether it is a possible deviation E_p or a mechanical error I value. In order to fully describe the characteristics of the distribution curve, the authors propose a new set of characteristic parameters, which are: the expected distribution center δ_c, the standard deviation σ and the skewness coefficient S_p of the effective sorting fraction.