[Discussion Thread 7] In the case where H/D is greater than 5, what does D refer to in towers with unequal diameters? — How many people know the answer?
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This post was last edited by kareale88 on 2019-1-19 at 20:41: bg4.png【Discussion Thread 7】In the case where H/D is greater than 5, what does D refer to for towers with different diameters? (D) A. The smallest diameter among all tower sections B. The largest diameter among all tower sections C. The arithmetic average of the diameters of all tower sections D. The weighted average of the diameters of all tower sections. So how are the arithmetic average and weighted average calculated exactly?
The weighted average is explained very well on Baidu, especially the example using exam scores is quite straightforward. https://baike.baidu.com/item/%E5%8A%A0%E6%9D%83%E5%B9%B3%E5%9D%87%E5%80%BC/7688373?fr=aladdin
This post was last edited by fy214152 on 2019-1-20 09:39. The explanatory text after D in clause 7.1, on page 24 of NB/T 47041-2014, is available. x1, x2...xn are replaced by D1, D2...Dn (the nominal diameters of the sections with different diameters of the tower), weights f1, f2...fn are replaced by l1, l2...ln (the lengths of the sections with different diameters of the tower), and the total number of units n is replaced by H (the height of the tower-type container, see Figure 15 in 47041)
This post was last edited by zjq1962 on 2019-1-21 at 12:34. The arithmetic mean is the sum of all diameters divided by the number of them, while the weighted mean takes into account the length of each tower section. The weighted average takes into account both the diameter and length of each tower section, making it more reasonable.
What 3# said is very clear: by taking the weighted average of the diameters of each segment, the advantage is that a more balanced consideration is achieved, and the calculation results are not significantly affected by the presence of individual values (extreme values, either very high or very low)
If there is such a conical section, how should it be accounted for? Should I take the median diameter?
The conical section means unequal diameters, and whether to use the mean diameter is a matter for discussion. It is recommended to create a separate topic.