在API RP 581-2016和GB/T 26610.4-2014中对换热器管束失效概率的计算都是基于威布尔概率统计方法,但其计算过程有较大区别。出于工程应用的考虑,GB/T 26610.4中威布尔概率统计公式的参数选取较简单,并没有像API RP 581中给出其它的参...在API RP 581-2016和GB/T 26610.4-2014中对换热器管束失效概率的计算都是基于威布尔概率统计方法,但其计算过程有较大区别。出于工程应用的考虑,GB/T 26610.4中威布尔概率统计公式的参数选取较简单,并没有像API RP 581中给出其它的参数选取方式。文章采用威布尔双参数和三参数计算模型对示例换热器管束进行了失效概率计算,同标准计算结果进行对比发现:GB/T 26610.4中的计算方法拟合效果较差。同时提出了基于设计参数确定η参数的取值方法,并将其应用于示例计算,得到了拟合程度近似于GB/T 26610.4中的计算方法,可以用于换热管束失效概率计算。展开更多
Aim To quantitatively study three characteristics of the Weibull distribution. Methods Theoritical analysis of the three characteristics of parameters of the Weibull distribution was done and mathematics software wa...Aim To quantitatively study three characteristics of the Weibull distribution. Methods Theoritical analysis of the three characteristics of parameters of the Weibull distribution was done and mathematics software was used to make some chart analysis. Results 17 equations and 7 figures were made. Conclusion Under the standard form, the class of the Weibull probable density founction(pdf) curves appear double peak shape. Under the standard form, the maximum value point curve of the Weibull pdf takes line t =0 and t=1 as asymptotes. When β = 3 30-3 40, the Weibull distribution is the most similar to the normal distribution.展开更多
文摘在API RP 581-2016和GB/T 26610.4-2014中对换热器管束失效概率的计算都是基于威布尔概率统计方法,但其计算过程有较大区别。出于工程应用的考虑,GB/T 26610.4中威布尔概率统计公式的参数选取较简单,并没有像API RP 581中给出其它的参数选取方式。文章采用威布尔双参数和三参数计算模型对示例换热器管束进行了失效概率计算,同标准计算结果进行对比发现:GB/T 26610.4中的计算方法拟合效果较差。同时提出了基于设计参数确定η参数的取值方法,并将其应用于示例计算,得到了拟合程度近似于GB/T 26610.4中的计算方法,可以用于换热管束失效概率计算。
文摘Aim To quantitatively study three characteristics of the Weibull distribution. Methods Theoritical analysis of the three characteristics of parameters of the Weibull distribution was done and mathematics software was used to make some chart analysis. Results 17 equations and 7 figures were made. Conclusion Under the standard form, the class of the Weibull probable density founction(pdf) curves appear double peak shape. Under the standard form, the maximum value point curve of the Weibull pdf takes line t =0 and t=1 as asymptotes. When β = 3 30-3 40, the Weibull distribution is the most similar to the normal distribution.
